diff options
Diffstat (limited to 'lib/krb5_wrap')
| -rw-r--r-- | lib/krb5_wrap/enctype_convert.c | 108 | ||||
| -rw-r--r-- | lib/krb5_wrap/gss_samba.c | 222 | ||||
| -rw-r--r-- | lib/krb5_wrap/gss_samba.h | 49 | ||||
| -rw-r--r-- | lib/krb5_wrap/keytab_util.c | 65 | ||||
| -rw-r--r-- | lib/krb5_wrap/krb5_errs.c | 115 | ||||
| -rw-r--r-- | lib/krb5_wrap/krb5_samba.c | 4043 | ||||
| -rw-r--r-- | lib/krb5_wrap/krb5_samba.h | 443 | ||||
| -rw-r--r-- | lib/krb5_wrap/wscript_build | 23 | ||||
| -rw-r--r-- | lib/krb5_wrap/wscript_configure | 18 |
9 files changed, 5086 insertions, 0 deletions
diff --git a/lib/krb5_wrap/enctype_convert.c b/lib/krb5_wrap/enctype_convert.c new file mode 100644 index 0000000..4a64435 --- /dev/null +++ b/lib/krb5_wrap/enctype_convert.c @@ -0,0 +1,108 @@ +/* + Unix SMB/CIFS implementation. + + Kerberos utility functions + + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2012 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "krb5_samba.h" +#include "librpc/gen_ndr/netlogon.h" + +const krb5_enctype *samba_all_enctypes(void) +{ + /* TODO: Find a way not to have to use a fixed list */ + static const krb5_enctype enctypes[] = { + ENCTYPE_DES_CBC_CRC, + ENCTYPE_DES_CBC_MD5, + ENCTYPE_AES128_CTS_HMAC_SHA1_96, + ENCTYPE_AES256_CTS_HMAC_SHA1_96, + ENCTYPE_ARCFOUR_HMAC, + 0 + }; + return enctypes; +}; + +/* Translate between the IETF encryption type values and the Microsoft + * msDS-SupportedEncryptionTypes values */ +uint32_t kerberos_enctype_to_bitmap(krb5_enctype enc_type_enum) +{ + switch (enc_type_enum) { + case ENCTYPE_DES_CBC_CRC: + return ENC_CRC32; + case ENCTYPE_DES_CBC_MD5: + return ENC_RSA_MD5; + case ENCTYPE_ARCFOUR_HMAC: + return ENC_RC4_HMAC_MD5; + case ENCTYPE_AES128_CTS_HMAC_SHA1_96: + return ENC_HMAC_SHA1_96_AES128; + case ENCTYPE_AES256_CTS_HMAC_SHA1_96: + return ENC_HMAC_SHA1_96_AES256; + default: + return 0; + } +} + +/* Translate between the Microsoft msDS-SupportedEncryptionTypes values + * and the IETF encryption type values */ +krb5_enctype ms_suptype_to_ietf_enctype(uint32_t enctype_bitmap) +{ + switch (enctype_bitmap) { + case ENC_CRC32: + return ENCTYPE_DES_CBC_CRC; + case ENC_RSA_MD5: + return ENCTYPE_DES_CBC_MD5; + case ENC_RC4_HMAC_MD5: + return ENCTYPE_ARCFOUR_HMAC; + case ENC_HMAC_SHA1_96_AES128: + return ENCTYPE_AES128_CTS_HMAC_SHA1_96; + case ENC_HMAC_SHA1_96_AES256: + return ENCTYPE_AES256_CTS_HMAC_SHA1_96; + default: + return 0; + } +} + +/* Return an array of krb5_enctype values */ +krb5_error_code ms_suptypes_to_ietf_enctypes(TALLOC_CTX *mem_ctx, + uint32_t enctype_bitmap, + krb5_enctype **enctypes) +{ + size_t max_bits = 8 * sizeof(enctype_bitmap); + size_t j = 0; + ssize_t i; + + *enctypes = talloc_zero_array(mem_ctx, krb5_enctype, + max_bits + 1); + if (!*enctypes) { + return ENOMEM; + } + + for (i = max_bits - 1; i >= 0; i--) { + uint32_t bit_value = (1U << i) & enctype_bitmap; + if (bit_value & enctype_bitmap) { + (*enctypes)[j] = ms_suptype_to_ietf_enctype(bit_value); + if (!(*enctypes)[j]) { + continue; + } + j++; + } + } + (*enctypes)[j] = 0; + return 0; +} diff --git a/lib/krb5_wrap/gss_samba.c b/lib/krb5_wrap/gss_samba.c new file mode 100644 index 0000000..a594056 --- /dev/null +++ b/lib/krb5_wrap/gss_samba.c @@ -0,0 +1,222 @@ +/* + * Unix SMB/CIFS implementation. + * + * Simple GSSAPI wrappers + * + * Copyright (c) 2012 Andreas Schneider <asn@samba.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "includes.h" +#include "gss_samba.h" + +#ifdef HAVE_GSSAPI + +#if !defined(HAVE_GSS_OID_EQUAL) +int smb_gss_oid_equal(const gss_OID first_oid, const gss_OID second_oid) +{ + if (first_oid == GSS_C_NO_OID || second_oid == GSS_C_NO_OID) { + return 0; + } + + if (first_oid == second_oid) { + return 1; + } + + if ((first_oid)->length != (second_oid)->length) { + return 0; + } + + if (memcmp((first_oid)->elements, (second_oid)->elements, + (first_oid)->length) == 0) { + return 1; + } + + return 0; +} +#endif /* !HAVE_GSS_OID_EQUAL */ + + +/* wrapper around gss_krb5_import_cred() that prefers to use gss_acquire_cred_from() + * if this GSSAPI extension is available. gss_acquire_cred_from() is properly + * interposed by GSSPROXY while gss_krb5_import_cred() is not. + * + * This wrapper requires a proper krb5_context to resolve ccache name. + * All gss_krb5_import_cred() callers in Samba already have krb5_context available. */ +uint32_t smb_gss_krb5_import_cred(uint32_t *minor_status, krb5_context ctx, + krb5_ccache id, krb5_principal keytab_principal, + krb5_keytab keytab, gss_cred_id_t *cred) +{ + uint32_t major_status = 0; + +#ifdef HAVE_GSS_ACQUIRE_CRED_FROM + uint32_t minor = 0; + gss_key_value_element_desc ccache_element = { + .key = "ccache", + .value = NULL, + }; + + gss_key_value_element_desc keytab_element = { + .key = "keytab", + .value = NULL, + }; + + gss_key_value_element_desc elements[2]; + + gss_key_value_set_desc cred_store = { + .elements = &ccache_element, + .count = 1, + }; + + /* we are interested exclusively in krb5 credentials, + * indicate to GSSAPI that we are not interested in any other + * mechanism here */ + gss_OID_set_desc mech_set = { + .count = 1, + .elements = discard_const_p(struct gss_OID_desc_struct, + gss_mech_krb5), + }; + + gss_cred_usage_t cred_usage = GSS_C_INITIATE; + gss_name_t name = NULL; + gss_buffer_desc pr_name = { + .value = NULL, + .length = 0, + }; + + if (id != NULL) { + major_status = krb5_cc_get_full_name(ctx, + id, + discard_const(&ccache_element.value)); + if (major_status != 0) { + return major_status; + } + } + + if (keytab != NULL) { + keytab_element.value = malloc(4096); + if (!keytab_element.value) { + return ENOMEM; + } + major_status = krb5_kt_get_name(ctx, + keytab, + discard_const(keytab_element.value), 4096); + if (major_status != 0) { + free(discard_const(keytab_element.value)); + return major_status; + } + cred_usage = GSS_C_ACCEPT; + cred_store.elements = &keytab_element; + + if (keytab_principal != NULL) { + major_status = krb5_unparse_name(ctx, keytab_principal, (char**)&pr_name.value); + if (major_status != 0) { + free(discard_const(keytab_element.value)); + return major_status; + } + pr_name.length = strlen(pr_name.value); + + major_status = gss_import_name(minor_status, + &pr_name, + discard_const(GSS_KRB5_NT_PRINCIPAL_NAME), + &name); + if (major_status != 0) { + krb5_free_unparsed_name(ctx, pr_name.value); + free(discard_const(keytab_element.value)); + return major_status; + } + } + } + + if (id != NULL && keytab != NULL) { + elements[0] = ccache_element; + elements[1] = keytab_element; + + cred_store.elements = elements; + cred_store.count = 2; + cred_usage = GSS_C_BOTH; + } + + major_status = gss_acquire_cred_from(minor_status, + name, + 0, + &mech_set, + cred_usage, + &cred_store, + cred, + NULL, + NULL); + + if (pr_name.value != NULL) { + (void)gss_release_name(&minor, &name); + krb5_free_unparsed_name(ctx, pr_name.value); + } + if (keytab_element.value != NULL) { + free(discard_const(keytab_element.value)); + } + krb5_free_string(ctx, discard_const(ccache_element.value)); +#else + major_status = gss_krb5_import_cred(minor_status, + id, + keytab_principal, + keytab, cred); + + if (major_status == (GSS_S_CALL_BAD_STRUCTURE|GSS_S_BAD_NAME)) { + if ((keytab_principal == NULL) && (keytab != NULL)) { + /* No principal was specified and MIT krb5 1.9 version failed. + * We have to fall back to set global acceptor identity */ + gss_OID_set_desc mech_set; + char *kt_name = NULL; + + kt_name = malloc(4096); + if (!kt_name) { + return ENOMEM; + } + + major_status = krb5_kt_get_name(ctx, + keytab, + kt_name, 4096); + if (major_status != 0) { + free(kt_name); + return major_status; + } + + major_status = gsskrb5_register_acceptor_identity(kt_name); + if (major_status) { + free(kt_name); + return major_status; + } + + /* We are dealing with krb5 GSSAPI mech in this fallback */ + mech_set.count = 1; + mech_set.elements = + discard_const_p(struct gss_OID_desc_struct, + gss_mech_krb5); + major_status = gss_acquire_cred(minor_status, + GSS_C_NO_NAME, + GSS_C_INDEFINITE, + &mech_set, + GSS_C_ACCEPT, + cred, + NULL, NULL); + free(kt_name); + } + } +#endif + return major_status; +} + + +#endif /* HAVE_GSSAPI */ diff --git a/lib/krb5_wrap/gss_samba.h b/lib/krb5_wrap/gss_samba.h new file mode 100644 index 0000000..89aee34 --- /dev/null +++ b/lib/krb5_wrap/gss_samba.h @@ -0,0 +1,49 @@ +/* + * Unix SMB/CIFS implementation. + * + * Simple GSSAPI wrappers + * + * Copyright (c) 2012 Andreas Schneider <asn@samba.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef _GSS_SAMBA_H +#define _GSS_SAMBA_H + +#ifdef HAVE_GSSAPI + +#include "system/gssapi.h" +#include "krb5_samba.h" + +#if defined(HAVE_GSS_OID_EQUAL) +#define smb_gss_oid_equal gss_oid_equal +#else +int smb_gss_oid_equal(const gss_OID first_oid, const gss_OID second_oid); +#endif /* HAVE_GSS_OID_EQUAL */ + +/* wrapper around gss_krb5_import_cred() that prefers to use gss_acquire_cred_from() + * if this GSSAPI extension is available. gss_acquire_cred_from() is properly + * interposed by GSS-proxy while gss_krb5_import_cred() is not. + * + * This wrapper requires a proper krb5_context to resolve the ccache name for + * gss_acquire_cred_from(). + * + * All gss_krb5_import_cred() callers in Samba already have krb5_context available. */ +uint32_t smb_gss_krb5_import_cred(OM_uint32 *minor_status, krb5_context ctx, + krb5_ccache id, krb5_principal keytab_principal, + krb5_keytab keytab, gss_cred_id_t *cred); + +#endif /* HAVE_GSSAPI */ +#endif /* _GSS_SAMBA_H */ diff --git a/lib/krb5_wrap/keytab_util.c b/lib/krb5_wrap/keytab_util.c new file mode 100644 index 0000000..ba8a79c --- /dev/null +++ b/lib/krb5_wrap/keytab_util.c @@ -0,0 +1,65 @@ +/* + * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * Copyright (c) 2011 Andrew Bartlett + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "includes.h" +#include "krb5_samba.h" + +#if !defined(HAVE_KRB5_KT_COMPARE) +krb5_boolean smb_krb5_kt_compare(krb5_context context, + krb5_keytab_entry *entry, + krb5_const_principal principal, + krb5_kvno kvno, + krb5_enctype enctype) +{ + if (principal) { + if (!krb5_principal_compare(context, + entry->principal, principal)) { + return false; + } + } + if (kvno) { + if (entry->vno != kvno) { + return false; + } + } + if (enctype) { + if (KRB5_KEY_TYPE(KRB5_KT_KEY(entry)) != enctype) { + return false; + } + } + + return true; +} +#endif diff --git a/lib/krb5_wrap/krb5_errs.c b/lib/krb5_wrap/krb5_errs.c new file mode 100644 index 0000000..d602b61 --- /dev/null +++ b/lib/krb5_wrap/krb5_errs.c @@ -0,0 +1,115 @@ +/* + * Unix SMB/CIFS implementation. + * Kerberos error mapping functions + * Copyright (C) Guenther Deschner 2005 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "includes.h" +#include "krb5_samba.h" + +#ifdef HAVE_KRB5 + +static const struct { + krb5_error_code krb5_code; + NTSTATUS ntstatus; +} krb5_to_nt_status_map[] = { + {KRB5_CC_IO, NT_STATUS_UNEXPECTED_IO_ERROR}, + {KRB5KDC_ERR_BADOPTION, NT_STATUS_INVALID_PARAMETER}, + {KRB5KDC_ERR_CLIENT_REVOKED, NT_STATUS_ACCOUNT_LOCKED_OUT}, + {KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN, NT_STATUS_INVALID_ACCOUNT_NAME}, + {KRB5KDC_ERR_ETYPE_NOSUPP, NT_STATUS_LOGON_FAILURE}, +#if defined(KRB5KDC_ERR_KEY_EXP) /* MIT */ + {KRB5KDC_ERR_KEY_EXP, NT_STATUS_PASSWORD_EXPIRED}, +#else /* old Heimdal releases have it with different name only in an enum: */ + {KRB5KDC_ERR_KEY_EXPIRED, NT_STATUS_PASSWORD_EXPIRED}, +#endif + {25, NT_STATUS_PASSWORD_EXPIRED}, /* FIXME: bug in heimdal 0.7 krb5_get_init_creds_password (Inappropriate ioctl for device (25)) */ + {KRB5KDC_ERR_NULL_KEY, NT_STATUS_LOGON_FAILURE}, + {KRB5KDC_ERR_POLICY, NT_STATUS_INVALID_WORKSTATION}, + {KRB5KDC_ERR_PREAUTH_FAILED, NT_STATUS_LOGON_FAILURE}, + {KRB5KDC_ERR_SERVICE_REVOKED, NT_STATUS_ACCESS_DENIED}, + {KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN, NT_STATUS_INVALID_COMPUTER_NAME}, + {KRB5KDC_ERR_SUMTYPE_NOSUPP, NT_STATUS_LOGON_FAILURE}, + {KRB5KDC_ERR_TGT_REVOKED, NT_STATUS_ACCESS_DENIED}, + {KRB5_KDC_UNREACH, NT_STATUS_NO_LOGON_SERVERS}, + {KRB5KRB_AP_ERR_BAD_INTEGRITY, NT_STATUS_LOGON_FAILURE}, + {KRB5KRB_AP_ERR_MODIFIED, NT_STATUS_LOGON_FAILURE}, + {KRB5KRB_AP_ERR_SKEW, NT_STATUS_TIME_DIFFERENCE_AT_DC}, + {KRB5_KDCREP_SKEW, NT_STATUS_TIME_DIFFERENCE_AT_DC}, + {KRB5KRB_AP_ERR_TKT_EXPIRED, NT_STATUS_LOGON_FAILURE}, + {KRB5KRB_ERR_GENERIC, NT_STATUS_UNSUCCESSFUL}, +#if defined(KRB5KRB_ERR_RESPONSE_TOO_BIG) + {KRB5KRB_ERR_RESPONSE_TOO_BIG, NT_STATUS_PROTOCOL_UNREACHABLE}, +#endif + {KRB5_CC_NOTFOUND, NT_STATUS_NO_SUCH_FILE}, + {KRB5_FCC_NOFILE, NT_STATUS_NO_SUCH_FILE}, + {KRB5_RC_MALLOC, NT_STATUS_NO_MEMORY}, + {ENOMEM, NT_STATUS_NO_MEMORY}, + {KRB5_REALM_CANT_RESOLVE, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND}, + {KRB5_REALM_UNKNOWN, NT_STATUS_NO_SUCH_DOMAIN}, + + /* Must be last entry */ + {KRB5KDC_ERR_NONE, NT_STATUS_OK} +}; + +static const struct { + NTSTATUS ntstatus; + krb5_error_code krb5_code; +} nt_status_to_krb5_map[] = { + {NT_STATUS_LOGON_FAILURE, KRB5KDC_ERR_PREAUTH_FAILED}, + {NT_STATUS_NO_LOGON_SERVERS, KRB5_KDC_UNREACH}, + {NT_STATUS_OK, 0} +}; + +/***************************************************************************** +convert a KRB5 error to a NT status32 code + *****************************************************************************/ + NTSTATUS krb5_to_nt_status(krb5_error_code kerberos_error) +{ + int i; + + if (kerberos_error == 0) { + return NT_STATUS_OK; + } + + for (i=0; NT_STATUS_V(krb5_to_nt_status_map[i].ntstatus); i++) { + if (kerberos_error == krb5_to_nt_status_map[i].krb5_code) + return krb5_to_nt_status_map[i].ntstatus; + } + + return NT_STATUS_UNSUCCESSFUL; +} + +/***************************************************************************** +convert an NT status32 code to a KRB5 error + *****************************************************************************/ + krb5_error_code nt_status_to_krb5(NTSTATUS nt_status) +{ + int i; + + if NT_STATUS_IS_OK(nt_status) { + return 0; + } + + for (i=0; NT_STATUS_V(nt_status_to_krb5_map[i].ntstatus); i++) { + if (NT_STATUS_EQUAL(nt_status,nt_status_to_krb5_map[i].ntstatus)) + return nt_status_to_krb5_map[i].krb5_code; + } + + return KRB5KRB_ERR_GENERIC; +} + +#endif diff --git a/lib/krb5_wrap/krb5_samba.c b/lib/krb5_wrap/krb5_samba.c new file mode 100644 index 0000000..116f916 --- /dev/null +++ b/lib/krb5_wrap/krb5_samba.c @@ -0,0 +1,4043 @@ +/* + Unix SMB/CIFS implementation. + simple kerberos5 routines for active directory + Copyright (C) Andrew Tridgell 2001 + Copyright (C) Luke Howard 2002-2003 + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005 + Copyright (C) Guenther Deschner 2005-2009 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "system/filesys.h" +#include "krb5_samba.h" +#include "lib/crypto/md4.h" +#include "../libds/common/flags.h" + +#ifdef HAVE_COM_ERR_H +#include <com_err.h> +#endif /* HAVE_COM_ERR_H */ + +#ifndef KRB5_AUTHDATA_WIN2K_PAC +#define KRB5_AUTHDATA_WIN2K_PAC 128 +#endif + +#ifndef KRB5_AUTHDATA_IF_RELEVANT +#define KRB5_AUTHDATA_IF_RELEVANT 1 +#endif + +#ifdef HAVE_KRB5 + +#define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */ +#define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */ +#define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length, + bind field, flags field. */ +#define GSS_C_DELEG_FLAG 1 + +/* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype, + but still has the symbol */ +#if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE +krb5_error_code krb5_auth_con_set_req_cksumtype( + krb5_context context, + krb5_auth_context auth_context, + krb5_cksumtype cksumtype); +#endif + +#if !defined(SMB_MALLOC) +#undef malloc +#define SMB_MALLOC(s) malloc((s)) +#endif + +#ifndef SMB_STRDUP +#define SMB_STRDUP(s) strdup(s) +#endif + +/********************************************************** + * MISSING FUNCTIONS + **********************************************************/ + +#if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES) + +#if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES) + +/* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference + * to krb5_set_default_tgs_ktypes. See + * http://lists.samba.org/archive/samba-technical/2006-July/048271.html + * + * If the MIT libraries are not exporting internal symbols, we will end up in + * this branch, which is correct. Otherwise we will continue to use the + * internal symbol + */ + krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc) +{ + return krb5_set_default_tgs_enctypes(ctx, enc); +} + +#elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES) + +/* Heimdal */ + krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc) +{ + return krb5_set_default_in_tkt_etypes(ctx, enc); +} + +#endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */ + +#endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */ + + +#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) +krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context, + krb5_auth_context auth_context, + krb5_keyblock *keyblock) +{ + return krb5_auth_con_setkey(context, auth_context, keyblock); +} +#endif + +#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME) +void krb5_free_unparsed_name(krb5_context context, char *val) +{ + SAFE_FREE(val); +} +#endif + +#if !defined(HAVE_KRB5_FREE_ENCTYPES) +void krb5_free_enctypes(krb5_context context, krb5_enctype *val) { + krb5_xfree(val); +} +#endif + +#if !defined(HAVE_KRB5_FREE_STRING) +void krb5_free_string(krb5_context context, char *val) { + SAFE_FREE(val); +} +#endif + +krb5_error_code smb_krb5_princ_component(krb5_context context, + krb5_const_principal principal, + int i, + krb5_data *data); +krb5_error_code smb_krb5_princ_component(krb5_context context, + krb5_const_principal principal, + int i, + krb5_data *data) +{ +#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT) + const char *component = NULL; + + if (i < 0) { + return EINVAL; + } + + component = krb5_principal_get_comp_string(context, principal, i); + if (component == NULL) { + return ENOENT; + } + + *data = smb_krb5_make_data(discard_const_p(char, component), strlen(component)); + + return 0; +#else + const krb5_data *kdata = NULL; + + if (i < 0) { + return EINVAL; + } + + kdata = krb5_princ_component(context, principal, i); + if (kdata == NULL) { + return ENOENT; + } + + *data = *kdata; + + return 0; +#endif +} + +/********************************************************** + * WRAPPING FUNCTIONS + **********************************************************/ + +/** + * @brief Stores the address of a 'struct sockaddr_storage' into a krb5_address + * + * @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the + * address from. + * + * @param[out] pkaddr A Kerberos address to store the address in. + * + * @return True on success, false if an error occurred. + */ +bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr, + krb5_address *pkaddr) +{ + memset(pkaddr, '\0', sizeof(krb5_address)); +#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) +/* HEIMDAL */ +#ifdef HAVE_IPV6 + if (paddr->ss_family == AF_INET6) { + pkaddr->addr_type = KRB5_ADDRESS_INET6; + pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr); + pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr); + return true; + } +#endif + if (paddr->ss_family == AF_INET) { + pkaddr->addr_type = KRB5_ADDRESS_INET; + pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr); + pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr); + return true; + } +#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) +/* MIT */ +#ifdef HAVE_IPV6 + if (paddr->ss_family == AF_INET6) { + pkaddr->addrtype = ADDRTYPE_INET6; + pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr); + pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr); + return true; + } +#endif + if (paddr->ss_family == AF_INET) { + pkaddr->addrtype = ADDRTYPE_INET; + pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr); + pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr); + return true; + } +#else +#error UNKNOWN_ADDRTYPE +#endif + return false; +} + +krb5_error_code smb_krb5_mk_error(krb5_context context, + krb5_error_code error_code, + const char *e_text, + krb5_data *e_data, + const krb5_principal client, + const krb5_principal server, + krb5_data *enc_err) +{ + krb5_error_code code = EINVAL; +#ifdef SAMBA4_USES_HEIMDAL + code = krb5_mk_error(context, + error_code, + e_text, + e_data, + client, + server, + NULL, /* client_time */ + NULL, /* client_usec */ + enc_err); +#else + krb5_principal unspec_server = NULL; + krb5_error errpkt; + + errpkt.ctime = 0; + errpkt.cusec = 0; + + code = krb5_us_timeofday(context, + &errpkt.stime, + &errpkt.susec); + if (code != 0) { + return code; + } + + errpkt.error = error_code - ERROR_TABLE_BASE_krb5; + + errpkt.text.length = 0; + if (e_text != NULL) { + errpkt.text = smb_krb5_make_data(discard_const_p(char, e_text), strlen(e_text)); + } + + errpkt.e_data = smb_krb5_make_data(NULL, 0); + if (e_data != NULL) { + errpkt.e_data = *e_data; + } + + errpkt.client = client; + + if (server != NULL) { + errpkt.server = server; + } else { + code = smb_krb5_make_principal(context, + &unspec_server, + "<unspecified realm>", + NULL); + if (code != 0) { + return code; + } + errpkt.server = unspec_server; + } + + code = krb5_mk_error(context, + &errpkt, + enc_err); + krb5_free_principal(context, unspec_server); +#endif + return code; +} + +/** +* @brief Create a keyblock based on input parameters +* +* @param context The krb5_context +* @param host_princ The krb5_principal to use +* @param salt The optional salt, if omitted, salt is calculated with +* the provided principal. +* @param password The krb5_data containing the password +* @param enctype The krb5_enctype to use for the keyblock generation +* @param key The returned krb5_keyblock, caller needs to free with +* krb5_free_keyblock(). +* +* @return krb5_error_code +*/ +int smb_krb5_create_key_from_string(krb5_context context, + krb5_const_principal host_princ, + const krb5_data *salt, + const krb5_data *password, + krb5_enctype enctype, + krb5_keyblock *key) +{ + int ret = 0; + + if (host_princ == NULL && salt == NULL) { + return -1; + } + + if ((int)enctype == (int)ENCTYPE_ARCFOUR_HMAC) { + TALLOC_CTX *frame = talloc_stackframe(); + uint8_t *utf16 = NULL; + size_t utf16_size = 0; + uint8_t nt_hash[16]; + bool ok; + + ok = convert_string_talloc(frame, CH_UNIX, CH_UTF16LE, + password->data, password->length, + &utf16, &utf16_size); + if (!ok) { + if (errno == 0) { + errno = EINVAL; + } + ret = errno; + TALLOC_FREE(frame); + return ret; + } + + mdfour(nt_hash, utf16, utf16_size); + BURN_PTR_SIZE(utf16, utf16_size); + ret = smb_krb5_keyblock_init_contents(context, + ENCTYPE_ARCFOUR_HMAC, + nt_hash, + sizeof(nt_hash), + key); + ZERO_STRUCT(nt_hash); + if (ret != 0) { + TALLOC_FREE(frame); + return ret; + } + + TALLOC_FREE(frame); + return 0; + } + +#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY) +{/* MIT */ + krb5_data _salt; + + if (salt == NULL) { + ret = krb5_principal2salt(context, host_princ, &_salt); + if (ret) { + DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret))); + return ret; + } + } else { + _salt = *salt; + } + ret = krb5_c_string_to_key(context, enctype, password, &_salt, key); + if (salt == NULL) { + SAFE_FREE(_salt.data); + } +} +#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT) +{/* Heimdal */ + krb5_salt _salt; + + if (salt == NULL) { + ret = krb5_get_pw_salt(context, host_princ, &_salt); + if (ret) { + DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret))); + return ret; + } + } else { + _salt.saltvalue = *salt; + _salt.salttype = KRB5_PW_SALT; + } + + ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key); + if (salt == NULL) { + krb5_free_salt(context, _salt); + } +} +#else +#error UNKNOWN_CREATE_KEY_FUNCTIONS +#endif + return ret; +} + +/** +* @brief Create a salt for a given principal +* +* @param context The initialized krb5_context +* @param host_princ The krb5_principal to create the salt for +* @param psalt A pointer to a krb5_data struct +* +* caller has to free the contents of psalt with smb_krb5_free_data_contents +* when function has succeeded +* +* @return krb5_error_code, returns 0 on success, error code otherwise +*/ + +int smb_krb5_get_pw_salt(krb5_context context, + krb5_const_principal host_princ, + krb5_data *psalt) +#if defined(HAVE_KRB5_GET_PW_SALT) +/* Heimdal */ +{ + int ret; + krb5_salt salt; + + ret = krb5_get_pw_salt(context, host_princ, &salt); + if (ret) { + return ret; + } + + *psalt = salt.saltvalue; + + return ret; +} +#elif defined(HAVE_KRB5_PRINCIPAL2SALT) +/* MIT */ +{ + return krb5_principal2salt(context, host_princ, psalt); +} +#else +#error UNKNOWN_SALT_FUNCTIONS +#endif + +/** + * @brief This constructs the salt principal used by active directory + * + * Most Kerberos encryption types require a salt in order to + * calculate the long term private key for user/computer object + * based on a password. + * + * The returned _salt_principal is a string in forms like this: + * - host/somehost.example.com@EXAMPLE.COM + * - SomeAccount@EXAMPLE.COM + * - SomePrincipal@EXAMPLE.COM + * + * This is not the form that's used as salt, it's just + * the human readable form. It needs to be converted by + * smb_krb5_salt_principal2data(). + * + * @param[in] realm The realm the user/computer is added too. + * + * @param[in] sAMAccountName The sAMAccountName attribute of the object. + * + * @param[in] userPrincipalName The userPrincipalName attribute of the object + * or NULL if not available. + * + * @param[in] uac_flags UF_ACCOUNT_TYPE_MASKed userAccountControl field + * + * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal. + * + * @param[out] _salt_principal The resulting principal as string. + * + * @retval 0 Success; otherwise - Kerberos error codes + * + * @see smb_krb5_salt_principal2data + */ +int smb_krb5_salt_principal(krb5_context krb5_ctx, + const char *realm, + const char *sAMAccountName, + const char *userPrincipalName, + uint32_t uac_flags, + krb5_principal *salt_princ) +{ + TALLOC_CTX *frame = talloc_stackframe(); + char *upper_realm = NULL; + const char *principal = NULL; + int principal_len = 0; + krb5_error_code krb5_ret; + + *salt_princ = NULL; + + if (sAMAccountName == NULL) { + TALLOC_FREE(frame); + return EINVAL; + } + + if (realm == NULL) { + TALLOC_FREE(frame); + return EINVAL; + } + + if (uac_flags & ~UF_ACCOUNT_TYPE_MASK) { + /* + * catch callers which still + * pass 'true'. + */ + TALLOC_FREE(frame); + return EINVAL; + } + if (uac_flags == 0) { + /* + * catch callers which still + * pass 'false'. + */ + TALLOC_FREE(frame); + return EINVAL; + } + + upper_realm = strupper_talloc(frame, realm); + if (upper_realm == NULL) { + TALLOC_FREE(frame); + return ENOMEM; + } + + /* Many, many thanks to lukeh@padl.com for this + * algorithm, described in his Nov 10 2004 mail to + * samba-technical@lists.samba.org */ + + /* + * Determine a salting principal + */ + if (uac_flags & UF_TRUST_ACCOUNT_MASK) { + int computer_len = 0; + + computer_len = strlen(sAMAccountName); + if (sAMAccountName[computer_len-1] == '$') { + computer_len -= 1; + } + + if (uac_flags & UF_INTERDOMAIN_TRUST_ACCOUNT) { + const char *krbtgt = "krbtgt"; + krb5_ret = krb5_build_principal_ext(krb5_ctx, + salt_princ, + strlen(upper_realm), + upper_realm, + strlen(krbtgt), + krbtgt, + computer_len, + sAMAccountName, + 0); + if (krb5_ret != 0) { + TALLOC_FREE(frame); + return krb5_ret; + } + } else { + const char *host = "host"; + char *tmp = NULL; + char *tmp_lower = NULL; + + tmp = talloc_asprintf(frame, "%*.*s.%s", + computer_len, + computer_len, + sAMAccountName, + realm); + if (tmp == NULL) { + TALLOC_FREE(frame); + return ENOMEM; + } + + tmp_lower = strlower_talloc(frame, tmp); + if (tmp_lower == NULL) { + TALLOC_FREE(frame); + return ENOMEM; + } + + krb5_ret = krb5_build_principal_ext(krb5_ctx, + salt_princ, + strlen(upper_realm), + upper_realm, + strlen(host), + host, + strlen(tmp_lower), + tmp_lower, + 0); + if (krb5_ret != 0) { + TALLOC_FREE(frame); + return krb5_ret; + } + } + + } else if (userPrincipalName != NULL) { + /* + * We parse the name not only to allow an easy + * replacement of the realm (no matter the realm in + * the UPN, the salt comes from the upper-case real + * realm, but also to correctly provide a salt when + * the UPN is host/foo.bar + * + * This can fail for a UPN of the form foo@bar@REALM + * (which is accepted by windows) however. + */ + krb5_ret = krb5_parse_name(krb5_ctx, + userPrincipalName, + salt_princ); + + if (krb5_ret != 0) { + TALLOC_FREE(frame); + return krb5_ret; + } + + /* + * No matter what realm (including none) in the UPN, + * the realm is replaced with our upper-case realm + */ + krb5_ret = smb_krb5_principal_set_realm(krb5_ctx, + *salt_princ, + upper_realm); + if (krb5_ret != 0) { + krb5_free_principal(krb5_ctx, *salt_princ); + TALLOC_FREE(frame); + return krb5_ret; + } + } else { + principal = sAMAccountName; + principal_len = strlen(principal); + + krb5_ret = krb5_build_principal_ext(krb5_ctx, + salt_princ, + strlen(upper_realm), + upper_realm, + principal_len, + principal, + 0); + if (krb5_ret != 0) { + TALLOC_FREE(frame); + return krb5_ret; + } + } + + TALLOC_FREE(frame); + return 0; +} + +/** + * @brief This constructs the salt principal used by active directory + * + * Most Kerberos encryption types require a salt in order to + * calculate the long term private key for user/computer object + * based on a password. + * + * The returned _salt_principal is a string in forms like this: + * - host/somehost.example.com@EXAMPLE.COM + * - SomeAccount@EXAMPLE.COM + * - SomePrincipal@EXAMPLE.COM + * + * This is not the form that's used as salt, it's just + * the human readable form. It needs to be converted by + * smb_krb5_salt_principal2data(). + * + * @param[in] realm The realm the user/computer is added too. + * + * @param[in] sAMAccountName The sAMAccountName attribute of the object. + * + * @param[in] userPrincipalName The userPrincipalName attribute of the object + * or NULL if not available. + * + * @param[in] uac_flags UF_ACCOUNT_TYPE_MASKed userAccountControl field + * + * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal. + * + * @param[out] _salt_principal The resulting principal as string. + * + * @retval 0 Success; otherwise - Kerberos error codes + * + * @see smb_krb5_salt_principal2data + */ +int smb_krb5_salt_principal_str(const char *realm, + const char *sAMAccountName, + const char *userPrincipalName, + uint32_t uac_flags, + TALLOC_CTX *mem_ctx, + char **_salt_principal_str) +{ + krb5_principal salt_principal = NULL; + char *salt_principal_malloc; + krb5_context krb5_ctx; + krb5_error_code krb5_ret + = smb_krb5_init_context_common(&krb5_ctx); + if (krb5_ret != 0) { + DBG_ERR("kerberos init context failed (%s)\n", + error_message(krb5_ret)); + return krb5_ret; + } + + krb5_ret = smb_krb5_salt_principal(krb5_ctx, + realm, + sAMAccountName, + userPrincipalName, + uac_flags, + &salt_principal); + if (krb5_ret != 0) { + DBG_ERR("unable to create salt principal:%s\n", + error_message(krb5_ret)); + return krb5_ret; + } + + krb5_ret = krb5_unparse_name(krb5_ctx, salt_principal, + &salt_principal_malloc); + if (krb5_ret != 0) { + krb5_free_principal(krb5_ctx, salt_principal); + DBG_ERR("kerberos unparse of salt principal failed (%s)\n", + error_message(krb5_ret)); + return krb5_ret; + } + krb5_free_principal(krb5_ctx, salt_principal); + *_salt_principal_str + = talloc_strdup(mem_ctx, salt_principal_malloc); + krb5_free_unparsed_name(krb5_ctx, salt_principal_malloc); + + if (*_salt_principal_str == NULL) { + return ENOMEM; + } + return 0; +} + +/** + * @brief Converts the salt principal string into the salt data blob + * + * This function takes a salt_principal as string in forms like this: + * - host/somehost.example.com@EXAMPLE.COM + * - SomeAccount@EXAMPLE.COM + * - SomePrincipal@EXAMPLE.COM + * + * It generates values like: + * - EXAMPLE.COMhost/somehost.example.com + * - EXAMPLE.COMSomeAccount + * - EXAMPLE.COMSomePrincipal + * + * @param[in] realm The realm the user/computer is added too. + * + * @param[in] sAMAccountName The sAMAccountName attribute of the object. + * + * @param[in] userPrincipalName The userPrincipalName attribute of the object + * or NULL if not available. + * + * @param[in] is_computer The indication of the object includes + * objectClass=computer. + * + * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal. + * + * @param[out] _salt_principal The resulting principal as string. + * + * @retval 0 Success; otherwise - Kerberos error codes + * + * @see smb_krb5_salt_principal + */ +int smb_krb5_salt_principal2data(krb5_context context, + const char *salt_principal, + TALLOC_CTX *mem_ctx, + char **_salt_data) +{ + krb5_error_code ret; + krb5_principal salt_princ = NULL; + krb5_data salt; + + *_salt_data = NULL; + + ret = krb5_parse_name(context, salt_principal, &salt_princ); + if (ret != 0) { + return ret; + } + + ret = smb_krb5_get_pw_salt(context, salt_princ, &salt); + krb5_free_principal(context, salt_princ); + if (ret != 0) { + return ret; + } + + *_salt_data = talloc_strndup(mem_ctx, + (char *)salt.data, + salt.length); + smb_krb5_free_data_contents(context, &salt); + if (*_salt_data == NULL) { + return ENOMEM; + } + + return 0; +} + +#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES) +/** + * @brief Get a list of encryption types allowed for session keys + * + * @param[in] context The library context + * + * @param[in] enctypes An allocated, zero-terminated list of encryption types + * + * This function returns an allocated list of encryption types allowed for + * session keys. + * + * Use krb5_free_enctypes() to free the enctypes when it is no longer needed. + * + * @retval 0 Success; otherwise - Kerberos error codes + */ +krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context, + krb5_enctype **enctypes) +{ + return krb5_get_permitted_enctypes(context, enctypes); +} +#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES) +krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context, + krb5_enctype **enctypes) +{ +#ifdef HAVE_KRB5_PDU_NONE_DECL + return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes); +#else + return krb5_get_default_in_tkt_etypes(context, enctypes); +#endif +} +#else +#error UNKNOWN_GET_ENCTYPES_FUNCTIONS +#endif + + +/** + * @brief Convert a string principal name to a Kerberos principal. + * + * @param[in] context The library context + * + * @param[in] name The principal as a unix charset string. + * + * @param[out] principal The newly allocated principal. + * + * Use krb5_free_principal() to free a principal when it is no longer needed. + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_parse_name(krb5_context context, + const char *name, + krb5_principal *principal) +{ + krb5_error_code ret; + char *utf8_name; + size_t converted_size; + TALLOC_CTX *frame = talloc_stackframe(); + + if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) { + talloc_free(frame); + return ENOMEM; + } + + ret = krb5_parse_name(context, utf8_name, principal); + if (ret == KRB5_PARSE_MALFORMED) { + ret = krb5_parse_name_flags(context, utf8_name, + KRB5_PRINCIPAL_PARSE_ENTERPRISE, + principal); + } + TALLOC_FREE(frame); + return ret; +} + +/** + * @brief Convert a Kerberos principal structure to a string representation. + * + * The resulting string representation will be a unix charset name and is + * talloc'ed. + * + * @param[in] mem_ctx The talloc context to allocate memory on. + * + * @param[in] context The library context. + * + * @param[in] principal The principal. + * + * @param[out] unix_name A string representation of the principal name as with + * unix charset. + * + * Use talloc_free() to free the string representation if it is no longer + * needed. + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_const_principal principal, + char **unix_name) +{ + krb5_error_code ret; + char *utf8_name; + size_t converted_size; + + *unix_name = NULL; + ret = krb5_unparse_name(context, principal, &utf8_name); + if (ret) { + return ret; + } + + if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) { + krb5_free_unparsed_name(context, utf8_name); + return ENOMEM; + } + krb5_free_unparsed_name(context, utf8_name); + return 0; +} + +/** + * @brief Free the contents of a krb5_data structure and zero the data field. + * + * @param[in] context The krb5 context + * + * @param[in] pdata The data structure to free contents of + * + * This function frees the contents, not the structure itself. + */ +void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata) +{ +#if defined(HAVE_KRB5_FREE_DATA_CONTENTS) + if (pdata->data) { + krb5_free_data_contents(context, pdata); + } +#elif defined(HAVE_KRB5_DATA_FREE) + krb5_data_free(context, pdata); +#else + SAFE_FREE(pdata->data); +#endif +} + +/* + * @brief copy a buffer into a krb5_data struct + * + * @param[in] p The krb5_data + * @param[in] data The data to copy + * @param[in] length The length of the data to copy + * @return krb5_error_code + * + * Caller has to free krb5_data with smb_krb5_free_data_contents(). + */ +krb5_error_code smb_krb5_copy_data_contents(krb5_data *p, + const void *data, + size_t len) +{ +#if defined(HAVE_KRB5_DATA_COPY) + return krb5_data_copy(p, data, len); +#else + if (len) { + p->data = malloc(len); + if (p->data == NULL) { + return ENOMEM; + } + memmove(p->data, data, len); + } else { + p->data = NULL; + } + p->length = len; + p->magic = KV5M_DATA; + return 0; +#endif +} + +/* + * @brief put a buffer reference into a krb5_data struct + * + * @param[in] data The data to reference + * @param[in] length The length of the data to reference + * @return krb5_data + * + * Caller should not free krb5_data. + */ +krb5_data smb_krb5_make_data(void *data, + size_t len) +{ + krb5_data d; + +#ifdef SAMBA4_USES_HEIMDAL + d.data = (uint8_t *)data; + d.length = len; +#else + d.magic = KV5M_DATA; + d.data = data; + d.length = len; +#endif + return d; +} + +krb5_data smb_krb5_data_from_blob(DATA_BLOB blob) +{ + return smb_krb5_make_data(blob.data, blob.length); +} + +bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_auth_context auth_context, + DATA_BLOB *session_key, + bool remote) +{ + krb5_keyblock *skey = NULL; + krb5_error_code err = 0; + bool ret = false; + + if (remote) { +#ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY + err = krb5_auth_con_getrecvsubkey(context, + auth_context, + &skey); +#else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */ + err = krb5_auth_con_getremotesubkey(context, + auth_context, &skey); +#endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */ + } else { +#ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY + err = krb5_auth_con_getsendsubkey(context, + auth_context, + &skey); +#else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */ + err = krb5_auth_con_getlocalsubkey(context, + auth_context, &skey); +#endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */ + } + + if (err || skey == NULL) { + DEBUG(10, ("KRB5 error getting session key %d\n", err)); + goto done; + } + + DEBUG(10, ("Got KRB5 session key of length %d\n", + (int)KRB5_KEY_LENGTH(skey))); + + *session_key = data_blob_talloc(mem_ctx, + KRB5_KEY_DATA(skey), + KRB5_KEY_LENGTH(skey)); + dump_data_pw("KRB5 Session Key:\n", + session_key->data, + session_key->length); + + ret = true; + +done: + if (skey) { + krb5_free_keyblock(context, skey); + } + + return ret; +} + + +/** + * @brief Get talloced string component of a principal + * + * @param[in] mem_ctx The TALLOC_CTX + * @param[in] context The krb5_context + * @param[in] principal The principal + * @param[in] component The component + * @param[out] out The output string + * @return krb5_error_code + * + * Caller must talloc_free if the return value is not NULL. + * + */ +krb5_error_code smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_const_principal principal, + unsigned int component, + char **out) +{ + char *out_str = NULL; +#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) + const char *str = NULL; + + str = krb5_principal_get_comp_string(context, principal, component); + if (str == NULL) { + return ENOENT; + } + + out_str = talloc_strdup(mem_ctx, str); + if (out_str == NULL) { + return ENOMEM; + } +#else + krb5_data *data; + + if (component >= krb5_princ_size(context, principal)) { + return ENOENT; + } + + data = krb5_princ_component(context, principal, component); + if (data == NULL) { + return ENOENT; + } + + out_str = talloc_strndup(mem_ctx, data->data, data->length); + if (out_str == NULL) { + return ENOMEM; + } +#endif + *out = out_str; + return 0; +} + +/** + * @brief + * + * @param[in] ccache_string A string pointing to the cache to renew the ticket + * (e.g. FILE:/tmp/krb5cc_0) or NULL. If the principal + * ccache has not been specified, the default ccache + * will be used. + * + * @param[in] client_string The client principal string (e.g. user@SAMBA.SITE) + * or NULL. If the principal string has not been + * specified, the principal from the ccache will be + * retrieved. + * + * @param[in] service_string The service ticket string + * (e.g. krbtgt/SAMBA.SITE@SAMBA.SITE) or NULL. If + * the service ticket is specified, it is parsed + * (with the realm part ignored) and used as the + * server principal of the credential. Otherwise + * the ticket-granting service is used. + * + * @param[in] expire_time A pointer to store the credentials end time or + * NULL. + * + * @return 0 on Success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, + const char *client_string, + const char *service_string, + time_t *expire_time) +{ + krb5_error_code ret; + krb5_context context = NULL; + krb5_ccache ccache = NULL; + krb5_principal client = NULL; + krb5_creds creds, creds_in; + + ZERO_STRUCT(creds); + ZERO_STRUCT(creds_in); + + ret = smb_krb5_init_context_common(&context); + if (ret) { + DBG_ERR("kerberos init context failed (%s)\n", + error_message(ret)); + goto done; + } + + if (!ccache_string) { + ccache_string = krb5_cc_default_name(context); + } + + if (!ccache_string) { + ret = EINVAL; + goto done; + } + + DBG_DEBUG("Using %s as ccache for client '%s' and service '%s'\n", + ccache_string, client_string, service_string); + + /* FIXME: we should not fall back to defaults */ + ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache); + if (ret) { + goto done; + } + + if (client_string) { + ret = smb_krb5_parse_name(context, client_string, &client); + if (ret) { + goto done; + } + } else { + ret = krb5_cc_get_principal(context, ccache, &client); + if (ret) { + goto done; + } + } + + ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string)); + if (ret) { + DBG_DEBUG("krb5_get_renewed_creds using ccache '%s' " + "for client '%s' and service '%s' failed: %s\n", + ccache_string, client_string, service_string, + error_message(ret)); + goto done; + } + + /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */ + ret = krb5_cc_initialize(context, ccache, client); + if (ret) { + goto done; + } + + ret = krb5_cc_store_cred(context, ccache, &creds); + + if (expire_time) { + *expire_time = (time_t) creds.times.endtime; + } + +done: + krb5_free_cred_contents(context, &creds_in); + krb5_free_cred_contents(context, &creds); + + if (client) { + krb5_free_principal(context, client); + } + if (ccache) { + krb5_cc_close(context, ccache); + } + if (context) { + krb5_free_context(context); + } + + return ret; +} + +/** + * @brief Free the data stored in an smb_krb5_addresses structure. + * + * @param[in] context The library context + * + * @param[in] addr The address structure to free. + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_free_addresses(krb5_context context, + smb_krb5_addresses *addr) +{ + krb5_error_code ret = 0; + if (addr == NULL) { + return ret; + } +#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ + krb5_free_addresses(context, addr->addrs); +#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */ + ret = krb5_free_addresses(context, addr->addrs); + SAFE_FREE(addr->addrs); +#endif + SAFE_FREE(addr); + addr = NULL; + return ret; +} + +#define MAX_NETBIOSNAME_LEN 16 + +/** + * @brief Add a netbios name to the array of addresses + * + * @param[in] kerb_addr A pointer to the smb_krb5_addresses to add the + * netbios name to. + * + * @param[in] netbios_name The netbios name to add. + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr, + const char *netbios_name) +{ + krb5_error_code ret = 0; + char buf[MAX_NETBIOSNAME_LEN]; + int len; +#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ + krb5_address **addrs = NULL; +#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */ + krb5_addresses *addrs = NULL; +#endif + + *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses)); + if (*kerb_addr == NULL) { + return ENOMEM; + } + + /* temporarily duplicate put_name() code here to avoid dependency + * issues for a 5 lines function */ + len = strlen(netbios_name); + memcpy(buf, netbios_name, + (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1); + if (len < MAX_NETBIOSNAME_LEN - 1) { + memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len); + } + buf[MAX_NETBIOSNAME_LEN - 1] = 0x20; + +#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ + { + int num_addr = 2; + + addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr); + if (addrs == NULL) { + SAFE_FREE(*kerb_addr); + return ENOMEM; + } + + memset(addrs, 0, sizeof(krb5_address *) * num_addr); + + addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address)); + if (addrs[0] == NULL) { + SAFE_FREE(addrs); + SAFE_FREE(*kerb_addr); + return ENOMEM; + } + + addrs[0]->magic = KV5M_ADDRESS; + addrs[0]->addrtype = KRB5_ADDR_NETBIOS; + addrs[0]->length = MAX_NETBIOSNAME_LEN; + addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length); + if (addrs[0]->contents == NULL) { + SAFE_FREE(addrs[0]); + SAFE_FREE(addrs); + SAFE_FREE(*kerb_addr); + return ENOMEM; + } + + memcpy(addrs[0]->contents, buf, addrs[0]->length); + + addrs[1] = NULL; + } +#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */ + { + addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses)); + if (addrs == NULL) { + SAFE_FREE(*kerb_addr); + return ENOMEM; + } + + memset(addrs, 0, sizeof(krb5_addresses)); + + addrs->len = 1; + addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address)); + if (addrs->val == NULL) { + SAFE_FREE(addrs); + SAFE_FREE(*kerb_addr); + return ENOMEM; + } + + addrs->val[0].addr_type = KRB5_ADDR_NETBIOS; + addrs->val[0].address.length = MAX_NETBIOSNAME_LEN; + addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length); + if (addrs->val[0].address.data == NULL) { + SAFE_FREE(addrs->val); + SAFE_FREE(addrs); + SAFE_FREE(*kerb_addr); + return ENOMEM; + } + + memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length); + } +#else +#error UNKNOWN_KRB5_ADDRESS_FORMAT +#endif + (*kerb_addr)->addrs = addrs; + + return ret; +} + +/** + * @brief Get the enctype from a key table entry + * + * @param[in] kt_entry Key table entry to get the enctype from. + * + * @return The enctype from the entry. + */ +krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry) +{ + return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry)); +} + +/** + * @brief Free the contents of a key table entry. + * + * @param[in] context The library context. + * + * @param[in] kt_entry The key table entry to free the contents of. + * + * @return 0 on success, a Kerberos error code otherwise. + * + * The pointer itself is not freed. + */ +krb5_error_code smb_krb5_kt_free_entry(krb5_context context, + krb5_keytab_entry *kt_entry) +{ +/* Try krb5_free_keytab_entry_contents first, since + * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and + * krb5_kt_free_entry but only has a prototype for the first, while the + * second is considered private. + */ +#if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS) + return krb5_free_keytab_entry_contents(context, kt_entry); +#elif defined(HAVE_KRB5_KT_FREE_ENTRY) + return krb5_kt_free_entry(context, kt_entry); +#else +#error UNKNOWN_KT_FREE_FUNCTION +#endif +} + + +/** + * @brief Convert an encryption type to a string. + * + * @param[in] context The library context. + * + * @param[in] enctype The encryption type. + * + * @param[in] etype_s A pointer to store the allocated encryption type as a + * string. + * + * @return 0 on success, a Kerberos error code otherwise. + * + * The caller needs to free the allocated string etype_s. + */ +krb5_error_code smb_krb5_enctype_to_string(krb5_context context, + krb5_enctype enctype, + char **etype_s) +{ +#ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG + return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */ +#elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG) + char buf[256]; + krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */ + if (ret) { + return ret; + } + *etype_s = SMB_STRDUP(buf); + if (!*etype_s) { + return ENOMEM; + } + return ret; +#else +#error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION +#endif +} + +/* This MAX_NAME_LEN is a constant defined in krb5.h */ +#ifndef MAX_KEYTAB_NAME_LEN +#define MAX_KEYTAB_NAME_LEN 1100 +#endif + +/** + * @brief Open a key table readonly or with readwrite access. + * + * Allows one to use a different keytab than the default one using a relative + * path to the keytab. + * + * @param[in] context The library context + * + * @param[in] keytab_name_req The path to the key table. + * + * @param[in] write_access Open with readwrite access. + * + * @param[in] keytab A pointer to the opened key table. + * + * The keytab pointer should be freed using krb5_kt_close(). + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_kt_open_relative(krb5_context context, + const char *keytab_name_req, + bool write_access, + krb5_keytab *keytab) +{ + krb5_error_code ret = 0; + TALLOC_CTX *mem_ctx; + char keytab_string[MAX_KEYTAB_NAME_LEN]; + char *kt_str = NULL; + bool found_valid_name = false; + const char *pragma = "FILE"; + const char *tmp = NULL; + + if (!write_access && !keytab_name_req) { + /* caller just wants to read the default keytab readonly, so be it */ + return krb5_kt_default(context, keytab); + } + + mem_ctx = talloc_init("smb_krb5_kt_open_relative"); + if (!mem_ctx) { + return ENOMEM; + } + +#ifdef HAVE_WRFILE_KEYTAB + if (write_access) { + pragma = "WRFILE"; + } +#endif + + if (keytab_name_req) { + + if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) { + ret = KRB5_CONFIG_NOTENUFSPACE; + goto out; + } + + if ((strncmp(keytab_name_req, "WRFILE:", 7) == 0) || + (strncmp(keytab_name_req, "FILE:", 5) == 0)) { + tmp = keytab_name_req; + goto resolve; + } + + tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req); + if (!tmp) { + ret = ENOMEM; + goto out; + } + + goto resolve; + } + + /* we need to handle more complex keytab_strings, like: + * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */ + + ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2); + if (ret) { + goto out; + } + + DBG_DEBUG("krb5_kt_default_name returned %s\n", keytab_string); + + tmp = talloc_strdup(mem_ctx, keytab_string); + if (!tmp) { + ret = ENOMEM; + goto out; + } + + if (strncmp(tmp, "ANY:", 4) == 0) { + tmp += 4; + } + + memset(&keytab_string, '\0', sizeof(keytab_string)); + + while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) { + if (strncmp(kt_str, "WRFILE:", 7) == 0) { + found_valid_name = true; + tmp = kt_str; + tmp += 7; + } + + if (strncmp(kt_str, "FILE:", 5) == 0) { + found_valid_name = true; + tmp = kt_str; + tmp += 5; + } + + if (tmp[0] == '/') { + /* Treat as a FILE: keytab definition. */ + found_valid_name = true; + } + + if (found_valid_name) { + if (tmp[0] != '/') { + ret = KRB5_KT_BADNAME; + goto out; + } + + tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp); + if (!tmp) { + ret = ENOMEM; + goto out; + } + break; + } + } + + if (!found_valid_name) { + ret = KRB5_KT_UNKNOWN_TYPE; + goto out; + } + +resolve: + DBG_DEBUG("resolving: %s\n", tmp); + ret = krb5_kt_resolve(context, tmp, keytab); + +out: + TALLOC_FREE(mem_ctx); + return ret; +} + +/** + * @brief Open a key table readonly or with readwrite access. + * + * Allows one to use a different keytab than the default one. The path needs to be + * an absolute path or an error will be returned. + * + * @param[in] context The library context + * + * @param[in] keytab_name_req The path to the key table. + * + * @param[in] write_access Open with readwrite access. + * + * @param[in] keytab A pointer to the opened key table. + * + * The keytab pointer should be freed using krb5_kt_close(). + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_kt_open(krb5_context context, + const char *keytab_name_req, + bool write_access, + krb5_keytab *keytab) +{ + int cmp; + + if (keytab_name_req == NULL) { + return KRB5_KT_BADNAME; + } + + if (keytab_name_req[0] == '/') { + goto open_keytab; + } + + cmp = strncmp(keytab_name_req, "FILE:/", 6); + if (cmp == 0) { + goto open_keytab; + } + + cmp = strncmp(keytab_name_req, "WRFILE:/", 8); + if (cmp == 0) { + goto open_keytab; + } + + DBG_WARNING("ERROR: Invalid keytab name: %s\n", keytab_name_req); + + return KRB5_KT_BADNAME; + +open_keytab: + return smb_krb5_kt_open_relative(context, + keytab_name_req, + write_access, + keytab); +} + +/** + * @brief Get a key table name. + * + * @param[in] mem_ctx The talloc context to use for allocation. + * + * @param[in] context The library context. + * + * @param[in] keytab The key table to get the name from. + * + * @param[in] keytab_name A talloc'ed string of the key table name. + * + * The talloc'ed name string needs to be freed with talloc_free(). + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_keytab keytab, + const char **keytab_name) +{ + char keytab_string[MAX_KEYTAB_NAME_LEN]; + krb5_error_code ret = 0; + + ret = krb5_kt_get_name(context, keytab, + keytab_string, MAX_KEYTAB_NAME_LEN - 2); + if (ret) { + return ret; + } + + *keytab_name = talloc_strdup(mem_ctx, keytab_string); + if (!*keytab_name) { + return ENOMEM; + } + + return ret; +} + +/** + * @brief Seek and delete old entries in a keytab based on the passed + * principal. + * + * @param[in] context The KRB5 context to use. + * + * @param[in] keytab The keytab to operate on. + * + * @param[in] keep_old_kvno Keep the entries with the previous kvno. + * + * @param[in] kvno The kvno to use. + * + * @param[in] enctype_only Only evaluate the enctype argument if true + * + * @param[in] enctype Only search for entries with the specified enctype + * + * @param[in] princ_s The principal as a string to search for. + * + * @param[in] princ The principal as a krb5_principal to search for. + * + * @param[in] flush Whether to flush the complete keytab. + * + * @retval 0 on Success + * + * @return An appropriate KRB5 error code. + */ +krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context, + krb5_keytab keytab, + bool keep_old_kvno, + krb5_kvno kvno, + bool enctype_only, + krb5_enctype enctype, + const char *princ_s, + krb5_principal princ, + bool flush) +{ + krb5_error_code ret; + krb5_kt_cursor cursor; + krb5_keytab_entry kt_entry; + char *ktprinc = NULL; + krb5_kvno old_kvno = kvno - 1; + TALLOC_CTX *tmp_ctx; + + if (flush) { + SMB_ASSERT(!keep_old_kvno); + SMB_ASSERT(!enctype_only); + SMB_ASSERT(princ_s == NULL); + SMB_ASSERT(princ == NULL); + } else { + SMB_ASSERT(princ_s != NULL); + SMB_ASSERT(princ != NULL); + } + + ZERO_STRUCT(cursor); + ZERO_STRUCT(kt_entry); + + /* + * Start with talloc_new() and only then call krb5_kt_start_seq_get(). + * If any of them fails, the cleanup code is simpler. + */ + tmp_ctx = talloc_new(NULL); + if (tmp_ctx == NULL) { + return ENOMEM; + } + + ret = krb5_kt_start_seq_get(context, keytab, &cursor); + if (ret == KRB5_KT_END || ret == ENOENT ) { + /* no entries */ + talloc_free(tmp_ctx); + return 0; + } + + DEBUG(3, (__location__ ": Will try to delete old keytab entries\n")); + while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) { + bool name_ok = false; + krb5_enctype kt_entry_enctype = + smb_krb5_kt_get_enctype_from_entry(&kt_entry); + + if (princ_s != NULL) { + ret = smb_krb5_unparse_name(tmp_ctx, context, + kt_entry.principal, + &ktprinc); + if (ret) { + DEBUG(1, (__location__ + ": smb_krb5_unparse_name failed " + "(%s)\n", error_message(ret))); + goto out; + } + +#ifdef HAVE_KRB5_KT_COMPARE + name_ok = krb5_kt_compare(context, &kt_entry, + princ, 0, 0); +#else + name_ok = (strcmp(ktprinc, princ_s) == 0); +#endif + + if (!name_ok) { + DEBUG(10, (__location__ ": ignoring keytab " + "entry principal %s, kvno = %d\n", + ktprinc, kt_entry.vno)); + + /* Not a match, + * just free this entry and continue. */ + ret = smb_krb5_kt_free_entry(context, + &kt_entry); + ZERO_STRUCT(kt_entry); + if (ret) { + DEBUG(1, (__location__ + ": smb_krb5_kt_free_entry " + "failed (%s)\n", + error_message(ret))); + goto out; + } + + TALLOC_FREE(ktprinc); + continue; + } + + TALLOC_FREE(ktprinc); + } + + /*------------------------------------------------------------ + * Save the entries with kvno - 1. This is what microsoft does + * to allow people with existing sessions that have kvno - 1 + * to still work. Otherwise, when the password for the machine + * changes, all kerberized sessions will 'break' until either + * the client reboots or the client's session key expires and + * they get a new session ticket with the new kvno. + * Some keytab files only store the kvno in 8bits, limit + * the compare accordingly. + */ + + if (keep_old_kvno && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) { + DEBUG(5, (__location__ ": Saving previous (kvno %d) " + "entry for principal: %s.\n", + old_kvno, + princ_s != NULL ? princ_s : "UNKNOWN")); + continue; + } + + if (enctype_only && + ((kt_entry.vno & 0xff) == (kvno & 0xff)) && + (kt_entry_enctype != enctype)) + { + DEBUG(5, (__location__ ": Saving entry with kvno [%d] " + "enctype [%d] for principal: %s.\n", + kvno, kt_entry_enctype, + princ_s != NULL ? princ_s : "UNKNOWN")); + continue; + } + + DEBUG(5, (__location__ ": Found old entry for principal: %s " + "(kvno %d) - trying to remove it.\n", + princ_s != NULL ? princ_s : "UNKNOWN", + kt_entry.vno)); + + ret = krb5_kt_end_seq_get(context, keytab, &cursor); + ZERO_STRUCT(cursor); + if (ret) { + DEBUG(1, (__location__ ": krb5_kt_end_seq_get() " + "failed (%s)\n", error_message(ret))); + goto out; + } + ret = krb5_kt_remove_entry(context, keytab, &kt_entry); + if (ret) { + DEBUG(1, (__location__ ": krb5_kt_remove_entry() " + "failed (%s)\n", error_message(ret))); + goto out; + } + + DEBUG(5, (__location__ ": removed old entry for principal: " + "%s (kvno %d).\n", + princ_s != NULL ? princ_s : "UNKNOWN", + kt_entry.vno)); + + ret = krb5_kt_start_seq_get(context, keytab, &cursor); + if (ret) { + DEBUG(1, (__location__ ": krb5_kt_start_seq() failed " + "(%s)\n", error_message(ret))); + goto out; + } + ret = smb_krb5_kt_free_entry(context, &kt_entry); + ZERO_STRUCT(kt_entry); + if (ret) { + DEBUG(1, (__location__ ": krb5_kt_remove_entry() " + "failed (%s)\n", error_message(ret))); + goto out; + } + } + +out: + talloc_free(tmp_ctx); + if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) { + smb_krb5_kt_free_entry(context, &kt_entry); + } + if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) { + krb5_kt_end_seq_get(context, keytab, &cursor); + } + return ret; +} + +/** + * @brief Add a keytab entry for the given principal + * + * @param[in] context The krb5 context to use. + * + * @param[in] keytab The keytab to add the entry to. + * + * @param[in] kvno The kvno to use. + * + * @param[in] princ_s The principal as a string. + * + * @param[in] salt_principal The salt principal to salt the password with. + * Only needed for keys which support salting. + * If no salt is used set no_salt to false and + * pass NULL here. + * + * @param[in] enctype The encryption type of the keytab entry. + * + * @param[in] password The password of the keytab entry. + * + * @param[in] no_salt If the password should not be salted. Normally + * this is only set to false for encryption types + * which do not support salting like RC4. + * + * @retval 0 on Success + * + * @return A corresponding KRB5 error code. + * + * @see smb_krb5_kt_open() + */ +krb5_error_code smb_krb5_kt_add_entry(krb5_context context, + krb5_keytab keytab, + krb5_kvno kvno, + const char *princ_s, + const char *salt_principal, + krb5_enctype enctype, + krb5_data *password, + bool no_salt) +{ + krb5_error_code ret; + krb5_keytab_entry kt_entry; + krb5_principal princ = NULL; + krb5_keyblock *keyp; + + ZERO_STRUCT(kt_entry); + + ret = smb_krb5_parse_name(context, princ_s, &princ); + if (ret) { + DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) " + "failed (%s)\n", princ_s, error_message(ret))); + goto out; + } + + /* Seek and delete old keytab entries */ + ret = smb_krb5_kt_seek_and_delete_old_entries(context, + keytab, + true, /* keep_old_kvno */ + kvno, + true, /* enctype_only */ + enctype, + princ_s, + princ, + false); /* flush */ + if (ret) { + goto out; + } + + /* If we get here, we have deleted all the old entries with kvno's + * not equal to the current kvno-1. */ + + keyp = KRB5_KT_KEY(&kt_entry); + + if (no_salt) { + KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length); + if (KRB5_KEY_DATA(keyp) == NULL) { + ret = ENOMEM; + goto out; + } + memcpy(KRB5_KEY_DATA(keyp), password->data, password->length); + KRB5_KEY_LENGTH(keyp) = password->length; + KRB5_KEY_TYPE(keyp) = enctype; + } else { + krb5_principal salt_princ = NULL; + + /* Now add keytab entries for all encryption types */ + ret = smb_krb5_parse_name(context, salt_principal, &salt_princ); + if (ret) { + DBG_WARNING("krb5_parse_name(%s) failed (%s)\n", + salt_principal, error_message(ret)); + goto out; + } + + ret = smb_krb5_create_key_from_string(context, + salt_princ, + NULL, + password, + enctype, + keyp); + krb5_free_principal(context, salt_princ); + if (ret != 0) { + goto out; + } + } + + kt_entry.principal = princ; + kt_entry.vno = kvno; + + DEBUG(3, (__location__ ": adding keytab entry for (%s) with " + "encryption type (%d) and version (%d)\n", + princ_s, enctype, kt_entry.vno)); + ret = krb5_kt_add_entry(context, keytab, &kt_entry); + krb5_free_keyblock_contents(context, keyp); + ZERO_STRUCT(kt_entry); + if (ret) { + DEBUG(1, (__location__ ": adding entry to keytab " + "failed (%s)\n", error_message(ret))); + goto out; + } + +out: + if (princ) { + krb5_free_principal(context, princ); + } + + return ret; +} + +#if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \ + defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \ + defined(HAVE_KRB5_GET_CREDS) +static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context, + krb5_ccache ccache, + krb5_principal me, + krb5_principal server, + krb5_principal impersonate_princ, + krb5_creds **out_creds) +{ + krb5_error_code ret; + krb5_get_creds_opt opt; + + ret = krb5_get_creds_opt_alloc(context, &opt); + if (ret) { + goto done; + } + krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE); + + if (impersonate_princ) { + ret = krb5_get_creds_opt_set_impersonate(context, opt, + impersonate_princ); + if (ret) { + goto done; + } + } + + ret = krb5_get_creds(context, opt, ccache, server, out_creds); + if (ret) { + goto done; + } + + done: + if (opt) { + krb5_get_creds_opt_free(context, opt); + } + return ret; +} +#endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */ + +#ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER + +#if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER +krb5_error_code KRB5_CALLCONV +krb5_get_credentials_for_user(krb5_context context, krb5_flags options, + krb5_ccache ccache, krb5_creds *in_creds, + krb5_data *subject_cert, + krb5_creds **out_creds); +#endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */ + +static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context, + krb5_ccache ccache, + krb5_principal me, + krb5_principal server, + krb5_principal impersonate_princ, + krb5_creds **out_creds) +{ + krb5_error_code ret; + krb5_creds in_creds; + + ZERO_STRUCT(in_creds); + + if (impersonate_princ) { + + in_creds.server = me; + in_creds.client = impersonate_princ; + + ret = krb5_get_credentials_for_user(context, + 0, /* krb5_flags options */ + ccache, + &in_creds, + NULL, /* krb5_data *subject_cert */ + out_creds); + } else { + in_creds.client = me; + in_creds.server = server; + + ret = krb5_get_credentials(context, 0, ccache, + &in_creds, out_creds); + } + + return ret; +} +#endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */ + +/* + * smb_krb5_get_credentials + * + * @brief Get krb5 credentials for a server + * + * @param[in] context An initialized krb5_context + * @param[in] ccache An initialized krb5_ccache + * @param[in] me The krb5_principal of the caller + * @param[in] server The krb5_principal of the requested service + * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional) + * @param[out] out_creds The returned krb5_creds structure + * @return krb5_error_code + * + */ +krb5_error_code smb_krb5_get_credentials(krb5_context context, + krb5_ccache ccache, + krb5_principal me, + krb5_principal server, + krb5_principal impersonate_princ, + krb5_creds **out_creds) +{ + krb5_error_code ret; + krb5_creds *creds = NULL; + + if (out_creds != NULL) { + *out_creds = NULL; + } + + if (impersonate_princ) { +#ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */ + ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds); +#elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */ + ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds); +#else + ret = ENOTSUP; +#endif + } else { + krb5_creds in_creds; + + ZERO_STRUCT(in_creds); + + in_creds.client = me; + in_creds.server = server; + + ret = krb5_get_credentials(context, 0, ccache, + &in_creds, &creds); + } + if (ret) { + goto done; + } + + if (out_creds) { + *out_creds = creds; + } + + done: + if (creds && ret) { + krb5_free_creds(context, creds); + } + + return ret; +} + +/** + * @brief Initialize a krb5_keyblock with the given data. + * + * Initializes a new keyblock, allocates the contents for the key and + * copies the data into the keyblock. + * + * @param[in] context The library context + * + * @param[in] enctype The encryption type. + * + * @param[in] data The date to initialize the keyblock with. + * + * @param[in] length The length of the keyblock. + * + * @param[in] key Newly allocated keyblock structure. + * + * The key date must be freed using krb5_free_keyblock_contents() when it is + * no longer needed. + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context, + krb5_enctype enctype, + const void *data, + size_t length, + krb5_keyblock *key) +{ +#if defined(HAVE_KRB5_KEYBLOCK_INIT) + return krb5_keyblock_init(context, enctype, data, length, key); +#else + memset(key, 0, sizeof(krb5_keyblock)); + KRB5_KEY_DATA(key) = SMB_MALLOC(length); + if (NULL == KRB5_KEY_DATA(key)) { + return ENOMEM; + } + memcpy(KRB5_KEY_DATA(key), data, length); + KRB5_KEY_LENGTH(key) = length; + KRB5_KEY_TYPE(key) = enctype; + return 0; +#endif +} + +/** + * @brief Simulate a kinit by putting the tgt in the given credential cache. + * + * This function uses a keyblock rather than needing the original password. + * + * @param[in] ctx The library context + * + * @param[in] cc The credential cache to put the tgt in. + * + * @param[in] principal The client princial + * + * @param[in] keyblock The keyblock to use. + * + * @param[in] target_service The service name of the initial credentials (or NULL). + * + * @param[in] krb_options Initial credential options. + * + * @param[in] expire_time A pointer to store the expiration time of the + * credentials (or NULL). + * + * @param[in] kdc_time A pointer to store the time when the ticket becomes + * valid (or NULL). + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx, + krb5_ccache cc, + krb5_principal principal, + krb5_keyblock *keyblock, + const char *target_service, + krb5_get_init_creds_opt *krb_options, + time_t *expire_time, + time_t *kdc_time) +{ + krb5_error_code code = 0; + krb5_creds my_creds; + +#if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK) + code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal, + keyblock, 0, target_service, + krb_options); +#elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB) +{ +#define SMB_CREDS_KEYTAB "MEMORY:tmp_kinit_keyblock_ccache" + char tmp_name[64] = {0}; + krb5_keytab_entry entry; + krb5_keytab keytab; + int rc; + + memset(&entry, 0, sizeof(entry)); + entry.principal = principal; + *(KRB5_KT_KEY(&entry)) = *keyblock; + + rc = snprintf(tmp_name, sizeof(tmp_name), + "%s-%p", + SMB_CREDS_KEYTAB, + &my_creds); + if (rc < 0) { + return KRB5_KT_BADNAME; + } + code = krb5_kt_resolve(ctx, tmp_name, &keytab); + if (code) { + return code; + } + + code = krb5_kt_add_entry(ctx, keytab, &entry); + if (code) { + (void)krb5_kt_close(ctx, keytab); + goto done; + } + + code = krb5_get_init_creds_keytab(ctx, &my_creds, principal, + keytab, 0, target_service, + krb_options); + (void)krb5_kt_close(ctx, keytab); +} +#else +#error krb5_get_init_creds_keyblock not available! +#endif + if (code) { + return code; + } + +#ifndef SAMBA4_USES_HEIMDAL /* MIT */ + /* + * We need to store the principal as returned from the KDC to the + * credentials cache. If we don't do that the KRB5 library is not + * able to find the tickets it is looking for + */ + principal = my_creds.client; +#endif + code = krb5_cc_initialize(ctx, cc, principal); + if (code) { + goto done; + } + + code = krb5_cc_store_cred(ctx, cc, &my_creds); + if (code) { + goto done; + } + + if (expire_time) { + *expire_time = (time_t) my_creds.times.endtime; + } + + if (kdc_time) { + *kdc_time = (time_t) my_creds.times.starttime; + } + + code = 0; +done: + krb5_free_cred_contents(ctx, &my_creds); + return code; +} + +/** + * @brief Simulate a kinit by putting the tgt in the given credential cache. + * + * @param[in] ctx The library context + * + * @param[in] cc The credential cache to put the tgt in. + * + * @param[in] principal The client princial + * + * @param[in] password The password (or NULL). + * + * @param[in] target_service The service name of the initial credentials (or NULL). + * + * @param[in] krb_options Initial credential options. + * + * @param[in] expire_time A pointer to store the expiration time of the + * credentials (or NULL). + * + * @param[in] kdc_time A pointer to store the time when the ticket becomes + * valid (or NULL). + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx, + krb5_ccache cc, + krb5_principal principal, + const char *password, + const char *target_service, + krb5_get_init_creds_opt *krb_options, + time_t *expire_time, + time_t *kdc_time) +{ + krb5_error_code code = 0; + krb5_creds my_creds; + + code = krb5_get_init_creds_password(ctx, &my_creds, principal, + password, NULL, NULL, 0, + target_service, krb_options); + if (code) { + return code; + } + + /* + * We need to store the principal as returned from the KDC to the + * credentials cache. If we don't do that the KRB5 library is not + * able to find the tickets it is looking for + */ + principal = my_creds.client; + code = krb5_cc_initialize(ctx, cc, principal); + if (code) { + goto done; + } + + code = krb5_cc_store_cred(ctx, cc, &my_creds); + if (code) { + goto done; + } + + if (expire_time) { + *expire_time = (time_t) my_creds.times.endtime; + } + + if (kdc_time) { + *kdc_time = (time_t) my_creds.times.starttime; + } + + code = 0; +done: + krb5_free_cred_contents(ctx, &my_creds); + return code; +} + +#ifdef SAMBA4_USES_HEIMDAL +/** + * @brief Simulate a kinit by putting the tgt in the given credential cache. + * + * @param[in] ctx The library context + * + * @param[in] cc The credential cache to store the tgt in. + * + * @param[in] principal The initial client princial. + * + * @param[in] password The password (or NULL). + * + * @param[in] impersonate_principal The impersonation principal (or NULL). + * + * @param[in] self_service The local service for S4U2Self if + * impersonate_principal is specified). + * + * @param[in] target_service The service name of the initial credentials + * (kpasswd/REALM or a remote service). It defaults + * to the krbtgt if NULL. + * + * @param[in] krb_options Initial credential options. + * + * @param[in] expire_time A pointer to store the expiration time of the + * credentials (or NULL). + * + * @param[in] kdc_time A pointer to store the time when the ticket becomes + * valid (or NULL). + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx, + krb5_ccache store_cc, + krb5_principal init_principal, + const char *init_password, + krb5_principal impersonate_principal, + const char *self_service, + const char *target_service, + krb5_get_init_creds_opt *krb_options, + time_t *expire_time, + time_t *kdc_time) +{ + krb5_error_code code = 0; + krb5_get_creds_opt options; + krb5_principal store_principal; + krb5_creds store_creds; + krb5_creds *s4u2self_creds; + Ticket s4u2self_ticket; + size_t s4u2self_ticketlen; + krb5_creds *s4u2proxy_creds; + krb5_principal self_princ; + bool s4u2proxy; + krb5_principal target_princ; + krb5_ccache tmp_cc; + const char *self_realm; + const char *client_realm = NULL; + krb5_principal blacklist_principal = NULL; + krb5_principal whitelist_principal = NULL; + + code = krb5_get_init_creds_password(ctx, &store_creds, + init_principal, + init_password, + NULL, NULL, + 0, + NULL, + krb_options); + if (code != 0) { + return code; + } + + store_principal = init_principal; + + /* + * We are trying S4U2Self now: + * + * As we do not want to expose our TGT in the + * krb5_ccache, which is also holds the impersonated creds. + * + * Some low level krb5/gssapi function might use the TGT + * identity and let the client act as our machine account. + * + * We need to avoid that and use a temporary krb5_ccache + * in order to pass our TGT to the krb5_get_creds() function. + */ + code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc); + if (code != 0) { + krb5_free_cred_contents(ctx, &store_creds); + return code; + } + + code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client); + if (code != 0) { + krb5_cc_destroy(ctx, tmp_cc); + krb5_free_cred_contents(ctx, &store_creds); + return code; + } + + code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds); + if (code != 0) { + krb5_free_cred_contents(ctx, &store_creds); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + /* + * we need to remember the client principal of our + * TGT and make sure the KDC does not return this + * in the impersonated tickets. This can happen + * if the KDC does not support S4U2Self and S4U2Proxy. + */ + blacklist_principal = store_creds.client; + store_creds.client = NULL; + krb5_free_cred_contents(ctx, &store_creds); + + /* + * Check if we also need S4U2Proxy or if S4U2Self is + * enough in order to get a ticket for the target. + */ + if (target_service == NULL) { + s4u2proxy = false; + } else if (strcmp(target_service, self_service) == 0) { + s4u2proxy = false; + } else { + s4u2proxy = true; + } + + /* + * For S4U2Self we need our own service principal, + * which belongs to our own realm (available on + * our client principal). + */ + self_realm = krb5_principal_get_realm(ctx, init_principal); + + code = krb5_parse_name(ctx, self_service, &self_princ); + if (code != 0) { + krb5_free_principal(ctx, blacklist_principal); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + code = krb5_principal_set_realm(ctx, self_princ, self_realm); + if (code != 0) { + krb5_free_principal(ctx, blacklist_principal); + krb5_free_principal(ctx, self_princ); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + code = krb5_get_creds_opt_alloc(ctx, &options); + if (code != 0) { + krb5_free_principal(ctx, blacklist_principal); + krb5_free_principal(ctx, self_princ); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + if (s4u2proxy) { + /* + * If we want S4U2Proxy, we need the forwardable flag + * on the S4U2Self ticket. + */ + krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE); + } + + code = krb5_get_creds_opt_set_impersonate(ctx, options, + impersonate_principal); + if (code != 0) { + krb5_get_creds_opt_free(ctx, options); + krb5_free_principal(ctx, blacklist_principal); + krb5_free_principal(ctx, self_princ); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + code = krb5_get_creds(ctx, options, tmp_cc, + self_princ, &s4u2self_creds); + krb5_get_creds_opt_free(ctx, options); + krb5_free_principal(ctx, self_princ); + if (code != 0) { + krb5_free_principal(ctx, blacklist_principal); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + if (!s4u2proxy) { + krb5_cc_destroy(ctx, tmp_cc); + + /* + * Now make sure we store the impersonated principal + * and creds instead of the TGT related stuff + * in the krb5_ccache of the caller. + */ + code = krb5_copy_creds_contents(ctx, s4u2self_creds, + &store_creds); + krb5_free_creds(ctx, s4u2self_creds); + if (code != 0) { + return code; + } + + /* + * It's important to store the principal the KDC + * returned, as otherwise the caller would not find + * the S4U2Self ticket in the krb5_ccache lookup. + */ + store_principal = store_creds.client; + goto store; + } + + /* + * We are trying S4U2Proxy: + * + * We need the ticket from the S4U2Self step + * and our TGT in order to get the delegated ticket. + */ + code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data, + s4u2self_creds->ticket.length, + &s4u2self_ticket, + &s4u2self_ticketlen); + if (code != 0) { + krb5_free_creds(ctx, s4u2self_creds); + krb5_free_principal(ctx, blacklist_principal); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + /* + * we need to remember the client principal of the + * S4U2Self stage and as it needs to match the one we + * will get for the S4U2Proxy stage. We need this + * in order to detect KDCs which does not support S4U2Proxy. + */ + whitelist_principal = s4u2self_creds->client; + s4u2self_creds->client = NULL; + krb5_free_creds(ctx, s4u2self_creds); + + /* + * For S4U2Proxy we also got a target service principal, + * which also belongs to our own realm (available on + * our client principal). + */ + code = krb5_parse_name(ctx, target_service, &target_princ); + if (code != 0) { + free_Ticket(&s4u2self_ticket); + krb5_free_principal(ctx, whitelist_principal); + krb5_free_principal(ctx, blacklist_principal); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + code = krb5_principal_set_realm(ctx, target_princ, self_realm); + if (code != 0) { + free_Ticket(&s4u2self_ticket); + krb5_free_principal(ctx, target_princ); + krb5_free_principal(ctx, whitelist_principal); + krb5_free_principal(ctx, blacklist_principal); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + code = krb5_get_creds_opt_alloc(ctx, &options); + if (code != 0) { + free_Ticket(&s4u2self_ticket); + krb5_free_principal(ctx, target_princ); + krb5_free_principal(ctx, whitelist_principal); + krb5_free_principal(ctx, blacklist_principal); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE); + krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION); + + code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket); + free_Ticket(&s4u2self_ticket); + if (code != 0) { + krb5_get_creds_opt_free(ctx, options); + krb5_free_principal(ctx, target_princ); + krb5_free_principal(ctx, whitelist_principal); + krb5_free_principal(ctx, blacklist_principal); + krb5_cc_destroy(ctx, tmp_cc); + return code; + } + + code = krb5_get_creds(ctx, options, tmp_cc, + target_princ, &s4u2proxy_creds); + krb5_get_creds_opt_free(ctx, options); + krb5_free_principal(ctx, target_princ); + krb5_cc_destroy(ctx, tmp_cc); + if (code != 0) { + krb5_free_principal(ctx, whitelist_principal); + krb5_free_principal(ctx, blacklist_principal); + return code; + } + + /* + * Now make sure we store the impersonated principal + * and creds instead of the TGT related stuff + * in the krb5_ccache of the caller. + */ + code = krb5_copy_creds_contents(ctx, s4u2proxy_creds, + &store_creds); + krb5_free_creds(ctx, s4u2proxy_creds); + if (code != 0) { + krb5_free_principal(ctx, whitelist_principal); + krb5_free_principal(ctx, blacklist_principal); + return code; + } + + /* + * It's important to store the principal the KDC + * returned, as otherwise the caller would not find + * the S4U2Self ticket in the krb5_ccache lookup. + */ + store_principal = store_creds.client; + + store: + if (blacklist_principal && + krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) { + char *sp = NULL; + char *ip = NULL; + + code = krb5_unparse_name(ctx, blacklist_principal, &sp); + if (code != 0) { + sp = NULL; + } + code = krb5_unparse_name(ctx, impersonate_principal, &ip); + if (code != 0) { + ip = NULL; + } + DBG_WARNING("KDC returned self principal[%s] while impersonating [%s]\n", + sp?sp:"<no memory>", + ip?ip:"<no memory>"); + + SAFE_FREE(sp); + SAFE_FREE(ip); + + krb5_free_principal(ctx, whitelist_principal); + krb5_free_principal(ctx, blacklist_principal); + krb5_free_cred_contents(ctx, &store_creds); + return KRB5_FWD_BAD_PRINCIPAL; + } + if (blacklist_principal) { + krb5_free_principal(ctx, blacklist_principal); + } + + if (whitelist_principal && + !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) { + char *sp = NULL; + char *ep = NULL; + + code = krb5_unparse_name(ctx, store_creds.client, &sp); + if (code != 0) { + sp = NULL; + } + code = krb5_unparse_name(ctx, whitelist_principal, &ep); + if (code != 0) { + ep = NULL; + } + DBG_WARNING("KDC returned wrong principal[%s] we expected [%s]\n", + sp?sp:"<no memory>", + ep?ep:"<no memory>"); + + SAFE_FREE(sp); + SAFE_FREE(ep); + + krb5_free_principal(ctx, whitelist_principal); + krb5_free_cred_contents(ctx, &store_creds); + return KRB5_FWD_BAD_PRINCIPAL; + } + if (whitelist_principal) { + krb5_free_principal(ctx, whitelist_principal); + } + + code = krb5_cc_initialize(ctx, store_cc, store_principal); + if (code != 0) { + krb5_free_cred_contents(ctx, &store_creds); + return code; + } + + code = krb5_cc_store_cred(ctx, store_cc, &store_creds); + if (code != 0) { + krb5_free_cred_contents(ctx, &store_creds); + return code; + } + + client_realm = krb5_principal_get_realm(ctx, store_creds.client); + if (client_realm != NULL) { + /* + * Because the CANON flag doesn't have any impact + * on the impersonate_principal => store_creds.client + * realm mapping. We need to store the credentials twice, + * once with the returned realm and once with the + * realm of impersonate_principal. + */ + code = krb5_principal_set_realm(ctx, store_creds.server, + client_realm); + if (code != 0) { + krb5_free_cred_contents(ctx, &store_creds); + return code; + } + + code = krb5_cc_store_cred(ctx, store_cc, &store_creds); + if (code != 0) { + krb5_free_cred_contents(ctx, &store_creds); + return code; + } + } + + if (expire_time) { + *expire_time = (time_t) store_creds.times.endtime; + } + + if (kdc_time) { + *kdc_time = (time_t) store_creds.times.starttime; + } + + krb5_free_cred_contents(ctx, &store_creds); + + return 0; +} + +#else /* MIT */ + +static bool princ_compare_no_dollar(krb5_context ctx, + krb5_principal a, + krb5_principal b) +{ + krb5_principal mod = NULL; + bool cmp; + + if (a->length == 1 && b->length == 1 && + a->data[0].length != 0 && b->data[0].length != 0 && + a->data[0].data[a->data[0].length - 1] != + b->data[0].data[b->data[0].length - 1]) { + if (a->data[0].data[a->data[0].length - 1] == '$') { + mod = a; + mod->data[0].length--; + } else if (b->data[0].data[b->data[0].length - 1] == '$') { + mod = b; + mod->data[0].length--; + } + } + + cmp = krb5_principal_compare_flags(ctx, + a, + b, + KRB5_PRINCIPAL_COMPARE_CASEFOLD); + if (mod != NULL) { + mod->data[0].length++; + } + + return cmp; +} + +krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx, + krb5_ccache store_cc, + krb5_principal init_principal, + const char *init_password, + krb5_principal impersonate_principal, + const char *self_service, + const char *target_service, + krb5_get_init_creds_opt *krb_options, + time_t *expire_time, + time_t *kdc_time) +{ + krb5_error_code code; + krb5_principal self_princ = NULL; + krb5_principal target_princ = NULL; + krb5_creds *store_creds = NULL; + krb5_creds *s4u2self_creds = NULL; + krb5_creds *s4u2proxy_creds = NULL; + krb5_creds init_creds = {0}; + krb5_creds mcreds = {0}; + krb5_flags options = KRB5_GC_NO_STORE; + krb5_ccache tmp_cc; + bool s4u2proxy = false; + bool ok; + + code = krb5_cc_new_unique(ctx, "MEMORY", NULL, &tmp_cc); + if (code != 0) { + return code; + } + + code = krb5_get_init_creds_password(ctx, + &init_creds, + init_principal, + init_password, + NULL, + NULL, + 0, + NULL, + krb_options); + if (code != 0) { + goto done; + } + + code = krb5_cc_initialize(ctx, tmp_cc, init_creds.client); + if (code != 0) { + goto done; + } + + code = krb5_cc_store_cred(ctx, tmp_cc, &init_creds); + if (code != 0) { + goto done; + } + + /* + * Check if we also need S4U2Proxy or if S4U2Self is + * enough in order to get a ticket for the target. + */ + if (target_service == NULL) { + s4u2proxy = false; + } else if (strcmp(target_service, self_service) == 0) { + s4u2proxy = false; + } else { + s4u2proxy = true; + } + + code = krb5_parse_name(ctx, self_service, &self_princ); + if (code != 0) { + goto done; + } + + /* + * MIT lacks aliases support in S4U, for S4U2Self we require the tgt + * client and the request server to be the same principal name. + */ + ok = princ_compare_no_dollar(ctx, init_creds.client, self_princ); + if (!ok) { + code = KRB5KDC_ERR_PADATA_TYPE_NOSUPP; + goto done; + } + + mcreds.client = impersonate_principal; + mcreds.server = init_creds.client; + + code = krb5_get_credentials_for_user(ctx, options, tmp_cc, &mcreds, + NULL, &s4u2self_creds); + if (code != 0) { + goto done; + } + + if (s4u2proxy) { + code = krb5_parse_name(ctx, target_service, &target_princ); + if (code != 0) { + goto done; + } + + mcreds.client = init_creds.client; + mcreds.server = target_princ; + mcreds.second_ticket = s4u2self_creds->ticket; + + code = krb5_get_credentials(ctx, options | + KRB5_GC_CONSTRAINED_DELEGATION, + tmp_cc, &mcreds, &s4u2proxy_creds); + if (code != 0) { + goto done; + } + + /* Check KDC support of S4U2Proxy extension */ + if (!krb5_principal_compare(ctx, s4u2self_creds->client, + s4u2proxy_creds->client)) { + code = KRB5KDC_ERR_PADATA_TYPE_NOSUPP; + goto done; + } + + store_creds = s4u2proxy_creds; + } else { + store_creds = s4u2self_creds;; + + /* We need to save the ticket with the requested server name + * or the caller won't be able to find it in cache. */ + if (!krb5_principal_compare(ctx, self_princ, + store_creds->server)) { + krb5_free_principal(ctx, store_creds->server); + store_creds->server = NULL; + code = krb5_copy_principal(ctx, self_princ, + &store_creds->server); + if (code != 0) { + goto done; + } + } + } + + code = krb5_cc_initialize(ctx, store_cc, store_creds->client); + if (code != 0) { + goto done; + } + + code = krb5_cc_store_cred(ctx, store_cc, store_creds); + if (code != 0) { + goto done; + } + + if (expire_time) { + *expire_time = (time_t) store_creds->times.endtime; + } + + if (kdc_time) { + *kdc_time = (time_t) store_creds->times.starttime; + } + +done: + krb5_cc_destroy(ctx, tmp_cc); + krb5_free_cred_contents(ctx, &init_creds); + krb5_free_creds(ctx, s4u2self_creds); + krb5_free_creds(ctx, s4u2proxy_creds); + krb5_free_principal(ctx, self_princ); + krb5_free_principal(ctx, target_princ); + + return code; +} +#endif + +#if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA) +/** + * @brief Create a principal name using a variable argument list. + * + * @param[in] context The library context. + * + * @param[inout] principal A pointer to the principal structure. + * + * @param[in] _realm The realm to use. If NULL then the function will + * get the default realm name. + * + * @param[in] ... A list of 'char *' components, ending with NULL. + * + * Use krb5_free_principal() to free the principal when it is no longer needed. + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_make_principal(krb5_context context, + krb5_principal *principal, + const char *_realm, ...) +{ + krb5_error_code code; + bool free_realm; + char *realm; + va_list ap; + + if (_realm) { + realm = discard_const_p(char, _realm); + free_realm = false; + } else { + code = krb5_get_default_realm(context, &realm); + if (code) { + return code; + } + free_realm = true; + } + + va_start(ap, _realm); + code = krb5_build_principal_alloc_va(context, principal, + strlen(realm), realm, + ap); + va_end(ap); + + if (free_realm) { + krb5_free_default_realm(context, realm); + } + + return code; +} +#endif + +#if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED) +/** + * @brief Get the lifetime of the initial ticket in the cache. + * + * @param[in] context The kerberos context. + * + * @param[in] id The credential cache to get the ticket lifetime. + * + * @param[out] t A pointer to a time value to store the lifetime. + * + * @return 0 on success, a krb5_error_code on error. + */ +krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context, + krb5_ccache id, + time_t *t) +{ + krb5_cc_cursor cursor; + krb5_error_code kerr; + krb5_creds cred; + krb5_timestamp now; + + *t = 0; + + kerr = krb5_timeofday(context, &now); + if (kerr) { + return kerr; + } + + kerr = krb5_cc_start_seq_get(context, id, &cursor); + if (kerr) { + return kerr; + } + + while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) { +#ifndef HAVE_FLAGS_IN_KRB5_CREDS + if (cred.ticket_flags & TKT_FLG_INITIAL) { +#else + if (cred.flags.b.initial) { +#endif + if (now < cred.times.endtime) { + *t = (time_t) (cred.times.endtime - now); + } + krb5_free_cred_contents(context, &cred); + break; + } + krb5_free_cred_contents(context, &cred); + } + + krb5_cc_end_seq_get(context, id, &cursor); + + return kerr; +} +#endif /* HAVE_KRB5_CC_GET_LIFETIME */ + +#if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM) +void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum) +{ + free_Checksum(cksum); +} +#endif + +/** + * @brief Compute a checksum operating on a keyblock. + * + * This function computes a checksum over a PAC using the keyblock for a keyed + * checksum. + * + * @param[in] mem_ctx A talloc context to allocate the signature on. + * + * @param[in] pac_data The PAC as input. + * + * @param[in] context The library context. + * + * @param[in] keyblock Encryption key for a keyed checksum. + * + * @param[out] sig_type The checksum type + * + * @param[out] sig_blob The talloc'ed checksum + * + * The caller must free the sig_blob with talloc_free() when it is not needed + * anymore. + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx, + DATA_BLOB *pac_data, + krb5_context context, + const krb5_keyblock *keyblock, + uint32_t *sig_type, + DATA_BLOB *sig_blob) +{ + krb5_error_code ret; + krb5_checksum cksum; +#if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM) + krb5_crypto crypto; + + + ret = krb5_crypto_init(context, + keyblock, + 0, + &crypto); + if (ret) { + DEBUG(0,("krb5_crypto_init() failed: %s\n", + smb_get_krb5_error_message(context, ret, mem_ctx))); + return ret; + } + ret = krb5_create_checksum(context, + crypto, + KRB5_KU_OTHER_CKSUM, + 0, + pac_data->data, + pac_data->length, + &cksum); + if (ret) { + DEBUG(2, ("PAC Verification failed: %s\n", + smb_get_krb5_error_message(context, ret, mem_ctx))); + } + + krb5_crypto_destroy(context, crypto); + + if (ret) { + return ret; + } + + *sig_type = cksum.cksumtype; + *sig_blob = data_blob_talloc(mem_ctx, + cksum.checksum.data, + cksum.checksum.length); +#elif defined(HAVE_KRB5_C_MAKE_CHECKSUM) + krb5_data input; + + input.data = (char *)pac_data->data; + input.length = pac_data->length; + + ret = krb5_c_make_checksum(context, + 0, + keyblock, + KRB5_KEYUSAGE_APP_DATA_CKSUM, + &input, + &cksum); + if (ret) { + DEBUG(2, ("PAC Verification failed: %s\n", + smb_get_krb5_error_message(context, ret, mem_ctx))); + return ret; + } + + *sig_type = cksum.checksum_type; + *sig_blob = data_blob_talloc(mem_ctx, + cksum.contents, + cksum.length); + +#else +#error krb5_create_checksum or krb5_c_make_checksum not available +#endif /* HAVE_KRB5_C_MAKE_CHECKSUM */ + smb_krb5_free_checksum_contents(context, &cksum); + + return 0; +} + + +/** + * @brief Get realm of a principal + * + * @param[in] mem_ctx The talloc ctx to put the result on + * + * @param[in] context The library context + * + * @param[in] principal The principal to get the realm from. + * + * @return A talloced string with the realm or NULL if an error occurred. + */ +char *smb_krb5_principal_get_realm(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_const_principal principal) +{ +#ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */ + const char *realm = NULL; + + realm = krb5_principal_get_realm(context, principal); + if (realm == NULL) { + return NULL; + } + + return talloc_strdup(mem_ctx, realm); +#elif defined(krb5_princ_realm) /* MIT */ + const krb5_data *realm = NULL; + + realm = krb5_princ_realm(context, principal); + if (realm == NULL) { + return NULL; + } + + return talloc_strndup(mem_ctx, realm->data, realm->length); +#else +#error UNKNOWN_GET_PRINC_REALM_FUNCTIONS +#endif +} + +/** + * @brief Get realm of a principal + * + * @param[in] context The library context + * + * @param[in] principal The principal to set the realm + * + * @param[in] realm The realm as a string to set. + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_principal_set_realm(krb5_context context, + krb5_principal principal, + const char *realm) +{ +#ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */ + return krb5_principal_set_realm(context, principal, realm); +#elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */ + krb5_error_code ret; + krb5_data data; + krb5_data *old_data; + + old_data = krb5_princ_realm(context, principal); + + ret = smb_krb5_copy_data_contents(&data, + realm, + strlen(realm)); + if (ret) { + return ret; + } + + /* free realm before setting */ + free(old_data->data); + + krb5_princ_set_realm(context, principal, &data); + + return ret; +#else +#error UNKNOWN_PRINC_SET_REALM_FUNCTION +#endif +} + + +/** + * @brief Get the realm from the service hostname. + * + * This function will look for a domain realm mapping in the [domain_realm] + * section of the krb5.conf first and fallback to extract the realm from + * the provided service hostname. As a last resort it will return the + * provided client_realm. + * + * @param[in] mem_ctx The talloc context + * + * @param[in] hostname The service hostname + * + * @param[in] client_realm If we can not find a mapping, fall back to + * this realm. + * + * @return The realm to use for the service hostname, NULL if a fatal error + * occurred. + */ +char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx, + const char *hostname, + const char *client_realm) +{ +#if defined(HAVE_KRB5_REALM_TYPE) + /* Heimdal. */ + krb5_realm *realm_list = NULL; +#else + /* MIT */ + char **realm_list = NULL; +#endif + char *realm = NULL; + krb5_error_code kerr; + krb5_context ctx = NULL; + + kerr = smb_krb5_init_context_common(&ctx); + if (kerr) { + DBG_ERR("kerberos init context failed (%s)\n", + error_message(kerr)); + return NULL; + } + + kerr = krb5_get_host_realm(ctx, hostname, &realm_list); + if (kerr == KRB5_ERR_HOST_REALM_UNKNOWN) { + realm_list = NULL; + kerr = 0; + } + if (kerr != 0) { + DEBUG(3,("kerberos_get_realm_from_hostname %s: " + "failed %s\n", + hostname ? hostname : "(NULL)", + error_message(kerr) )); + goto out; + } + + if (realm_list != NULL && + realm_list[0] != NULL && + realm_list[0][0] != '\0') { + realm = talloc_strdup(mem_ctx, realm_list[0]); + if (realm == NULL) { + goto out; + } + } else { + const char *p = NULL; + + /* + * "dc6.samba2003.example.com" + * returns a realm of "SAMBA2003.EXAMPLE.COM" + * + * "dc6." returns realm as NULL + */ + p = strchr_m(hostname, '.'); + if (p != NULL && p[1] != '\0') { + realm = talloc_strdup_upper(mem_ctx, p + 1); + if (realm == NULL) { + goto out; + } + } + } + + if (realm == NULL) { + realm = talloc_strdup(mem_ctx, client_realm); + } + + out: + + if (ctx) { + if (realm_list) { + krb5_free_host_realm(ctx, realm_list); + realm_list = NULL; + } + krb5_free_context(ctx); + ctx = NULL; + } + return realm; +} + +/** + * @brief Get an error string from a Kerberos error code. + * + * @param[in] context The library context. + * + * @param[in] code The Kerberos error code. + * + * @param[in] mem_ctx The talloc context to allocate the error string on. + * + * @return A talloc'ed error string or NULL if an error occurred. + * + * The caller must free the returned error string with talloc_free() if not + * needed anymore + */ +char *smb_get_krb5_error_message(krb5_context context, + krb5_error_code code, + TALLOC_CTX *mem_ctx) +{ + char *ret; + +#if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE) + const char *context_error = krb5_get_error_message(context, code); + if (context_error) { + ret = talloc_asprintf(mem_ctx, "%s: %s", + error_message(code), context_error); + krb5_free_error_message(context, context_error); + return ret; + } +#endif + ret = talloc_strdup(mem_ctx, error_message(code)); + return ret; +} + +/** + * @brief Return the type of a krb5_principal + * + * @param[in] context The library context. + * + * @param[in] principal The principal to get the type from. + * + * @return The integer type of the principal. + */ +int smb_krb5_principal_get_type(krb5_context context, + krb5_const_principal principal) +{ +#ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */ + return krb5_principal_get_type(context, principal); +#elif defined(krb5_princ_type) /* MIT */ + return krb5_princ_type(context, principal); +#else +#error UNKNOWN_PRINC_GET_TYPE_FUNCTION +#endif +} + +/** + * @brief Set the type of a principal + * + * @param[in] context The library context + * + * @param[inout] principal The principal to set the type for. + * + * @param[in] type The principal type to set. + */ +void smb_krb5_principal_set_type(krb5_context context, + krb5_principal principal, + int type) +{ +#ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */ + krb5_principal_set_type(context, principal, type); +#elif defined(krb5_princ_type) /* MIT */ + krb5_princ_type(context, principal) = type; +#else +#error UNKNOWN_PRINC_SET_TYPE_FUNCTION +#endif +} + +/** + * @brief Check if a principal is a TGS + * + * @param[in] context The library context + * + * @param[inout] principal The principal to check. + * + * @returns 1 if equal, 0 if not and -1 on error. + */ +int smb_krb5_principal_is_tgs(krb5_context context, + krb5_const_principal principal) +{ + char *p = NULL; + int eq = 1; + krb5_error_code ret = 0; + + if (krb5_princ_size(context, principal) > 2) { + return 0; + } + + ret = smb_krb5_principal_get_comp_string(NULL, context, principal, 0, &p); + if (ret == ENOENT) { + return 0; + } else if (ret) { + return -1; + } + + eq = strcmp(p, KRB5_TGS_NAME) == 0; + + talloc_free(p); + + return eq; +} + +#if !defined(HAVE_KRB5_WARNX) +/** + * @brief Log a Kerberos message + * + * It sends the message to com_err. + * + * @param[in] context The library context + * + * @param[in] fmt The message format + * + * @param[in] ... The message arguments + * + * @return 0 on success. + */ +krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + com_err_va("samba-kdc", errno, fmt, args); + va_end(args); + + return 0; +} +#endif + +/** + * @brief Copy a credential cache. + * + * @param[in] context The library context. + * + * @param[in] incc Credential cache to be copied. + * + * @param[inout] outcc Copy of credential cache to be filled in. + * + * @return 0 on success, a Kerberos error code otherwise. + */ +krb5_error_code smb_krb5_cc_copy_creds(krb5_context context, + krb5_ccache incc, krb5_ccache outcc) +{ +#ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */ + return krb5_cc_copy_cache(context, incc, outcc); +#elif defined(HAVE_KRB5_CC_COPY_CREDS) + krb5_error_code ret; + krb5_principal princ = NULL; + + ret = krb5_cc_get_principal(context, incc, &princ); + if (ret != 0) { + return ret; + } + ret = krb5_cc_initialize(context, outcc, princ); + krb5_free_principal(context, princ); + if (ret != 0) { + return ret; + } + return krb5_cc_copy_creds(context, incc, outcc); +#else +#error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION +#endif +} + +/********************************************************** + * ADS KRB5 CALLS + **********************************************************/ + +static bool ads_cleanup_expired_creds(krb5_context context, + krb5_ccache ccache, + krb5_creds *credsp) +{ + krb5_error_code retval; + const char *cc_type = krb5_cc_get_type(context, ccache); + + DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n", + cc_type, krb5_cc_get_name(context, ccache), + http_timestring(talloc_tos(), credsp->times.endtime))); + + /* we will probably need new tickets if the current ones + will expire within 10 seconds. + */ + if (credsp->times.endtime >= (time(NULL) + 10)) + return false; + + /* heimdal won't remove creds from a file ccache, and + perhaps we shouldn't anyway, since internally we + use memory ccaches, and a FILE one probably means that + we're using creds obtained outside of our executable + */ + if (strequal(cc_type, "FILE")) { + DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type)); + return false; + } + + retval = krb5_cc_remove_cred(context, ccache, 0, credsp); + if (retval) { + DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n", + error_message(retval))); + /* If we have an error in this, we want to display it, + but continue as though we deleted it */ + } + return true; +} + +/* Allocate and setup the auth context into the state we need. */ + +static krb5_error_code ads_setup_auth_context(krb5_context context, + krb5_auth_context *auth_context) +{ + krb5_error_code retval; + + retval = krb5_auth_con_init(context, auth_context ); + if (retval) { + DEBUG(1,("krb5_auth_con_init failed (%s)\n", + error_message(retval))); + return retval; + } + + /* Ensure this is an addressless ticket. */ + retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL); + if (retval) { + DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", + error_message(retval))); + } + + return retval; +} + +#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) +static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */ + uint32_t gss_flags) +{ + unsigned int orig_length = in_data->length; + unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE; + char *gss_cksum = NULL; + + if (orig_length) { + /* Extra length field for delegated ticket. */ + base_cksum_size += 4; + } + + if ((unsigned int)base_cksum_size + orig_length < + (unsigned int)base_cksum_size) { + return EINVAL; + } + + gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length); + if (gss_cksum == NULL) { + return ENOMEM; + } + + memset(gss_cksum, '\0', base_cksum_size + orig_length); + SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH); + + /* + * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes. + * This matches the behavior of heimdal and mit. + * + * And it is needed to work against some closed source + * SMB servers. + * + * See bug #7883 + */ + memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH); + + SIVAL(gss_cksum, 20, gss_flags); + + if (orig_length && in_data->data != NULL) { + SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */ + SSVAL(gss_cksum, 26, orig_length); + /* Copy the kerberos KRB_CRED data */ + memcpy(gss_cksum + 28, in_data->data, orig_length); + free(in_data->data); + in_data->data = NULL; + in_data->length = 0; + } + in_data->data = gss_cksum; + in_data->length = base_cksum_size + orig_length; + return 0; +} +#endif + +/* + * We can't use krb5_mk_req because w2k wants the service to be in a particular + * format. + */ +static krb5_error_code ads_krb5_mk_req(krb5_context context, + krb5_auth_context *auth_context, + const krb5_flags ap_req_options, + const char *principal, + krb5_ccache ccache, + krb5_data *outbuf, + time_t *expire_time, + const char *impersonate_princ_s) +{ + krb5_error_code retval; + krb5_principal server; + krb5_principal impersonate_princ = NULL; + krb5_creds *credsp; + krb5_creds creds; + krb5_data in_data; + bool creds_ready = false; + int i = 0, maxtries = 3; + bool ok; + + ZERO_STRUCT(in_data); + + retval = smb_krb5_parse_name(context, principal, &server); + if (retval != 0) { + DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal)); + return retval; + } + + if (impersonate_princ_s) { + retval = smb_krb5_parse_name(context, impersonate_princ_s, + &impersonate_princ); + if (retval) { + DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s)); + goto cleanup_princ; + } + } + + /* obtain ticket & session key */ + ZERO_STRUCT(creds); + if ((retval = krb5_copy_principal(context, server, &creds.server))) { + DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n", + error_message(retval))); + goto cleanup_princ; + } + + retval = krb5_cc_get_principal(context, ccache, &creds.client); + if (retval != 0) { + /* This can commonly fail on smbd startup with no ticket in the cache. + * Report at higher level than 1. */ + DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n", + error_message(retval))); + goto cleanup_creds; + } + + while (!creds_ready && (i < maxtries)) { + + retval = smb_krb5_get_credentials(context, + ccache, + creds.client, + creds.server, + impersonate_princ, + &credsp); + if (retval != 0) { + DBG_WARNING("smb_krb5_get_credentials failed for %s " + "(%s)\n", + principal, + error_message(retval)); + goto cleanup_creds; + } + + /* cope with ticket being in the future due to clock skew */ + if ((unsigned)credsp->times.starttime > time(NULL)) { + time_t t = time(NULL); + int time_offset =(int)((unsigned)credsp->times.starttime-t); + DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset)); + krb5_set_real_time(context, t + time_offset + 1, 0); + } + + ok = ads_cleanup_expired_creds(context, ccache, credsp); + if (!ok) { + creds_ready = true; + } + + i++; + } + + DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n", + principal, + krb5_cc_get_type(context, ccache), + krb5_cc_get_name(context, ccache), + http_timestring(talloc_tos(), + (unsigned)credsp->times.endtime), + (unsigned)credsp->times.endtime); + + if (expire_time) { + *expire_time = (time_t)credsp->times.endtime; + } + + /* Allocate the auth_context. */ + retval = ads_setup_auth_context(context, auth_context); + if (retval != 0) { + DBG_WARNING("ads_setup_auth_context failed (%s)\n", + error_message(retval)); + goto cleanup_creds; + } + +#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) + { + uint32_t gss_flags = 0; + + if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) { + /* + * Fetch a forwarded TGT from the KDC so that we can + * hand off a 2nd ticket as part of the kerberos + * exchange. + */ + + DBG_INFO("Server marked as OK to delegate to, building " + "forwardable TGT\n"); + + retval = krb5_auth_con_setuseruserkey(context, + *auth_context, + &credsp->keyblock ); + if (retval != 0) { + DBG_WARNING("krb5_auth_con_setuseruserkey " + "failed (%s)\n", + error_message(retval)); + goto cleanup_creds; + } + + /* Must use a subkey for forwarded tickets. */ + retval = krb5_auth_con_setflags(context, + *auth_context, + KRB5_AUTH_CONTEXT_USE_SUBKEY); + if (retval != 0) { + DBG_WARNING("krb5_auth_con_setflags failed (%s)\n", + error_message(retval)); + goto cleanup_creds; + } + + retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */ + *auth_context, /* Authentication context [in] */ + discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */ + credsp->client, /* Client principal for the tgt [in] */ + credsp->server, /* Server principal for the tgt [in] */ + ccache, /* Credential cache to use for storage [in] */ + 1, /* Turn on for "Forwardable ticket" [in] */ + &in_data ); /* Resulting response [out] */ + + if (retval) { + DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n", + error_message(retval)); + + /* + * This is not fatal. Delete the *auth_context and continue + * with krb5_mk_req_extended to get a non-forwardable ticket. + */ + + if (in_data.data) { + free( in_data.data ); + in_data.data = NULL; + in_data.length = 0; + } + krb5_auth_con_free(context, *auth_context); + *auth_context = NULL; + retval = ads_setup_auth_context(context, auth_context); + if (retval != 0) { + DBG_WARNING("ads_setup_auth_context failed (%s)\n", + error_message(retval)); + goto cleanup_creds; + } + } else { + /* We got a delegated ticket. */ + gss_flags |= GSS_C_DELEG_FLAG; + } + } + + /* Frees and reallocates in_data into a GSS checksum blob. */ + retval = ads_create_gss_checksum(&in_data, gss_flags); + if (retval != 0) { + goto cleanup_data; + } + + /* We always want GSS-checksum types. */ + retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM ); + if (retval != 0) { + DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n", + error_message(retval))); + goto cleanup_data; + } + } +#endif + + retval = krb5_mk_req_extended(context, auth_context, ap_req_options, + &in_data, credsp, outbuf); + if (retval != 0) { + DBG_WARNING("krb5_mk_req_extended failed (%s)\n", + error_message(retval)); + } + +#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) +cleanup_data: +#endif + + if (in_data.data) { + free( in_data.data ); + in_data.length = 0; + } + + krb5_free_creds(context, credsp); + +cleanup_creds: + krb5_free_cred_contents(context, &creds); + +cleanup_princ: + krb5_free_principal(context, server); + if (impersonate_princ) { + krb5_free_principal(context, impersonate_princ); + } + + return retval; +} + +/* + get a kerberos5 ticket for the given service +*/ +int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx, + const char *principal, + time_t time_offset, + DATA_BLOB *ticket, + DATA_BLOB *session_key_krb5, + uint32_t extra_ap_opts, const char *ccname, + time_t *tgs_expire, + const char *impersonate_princ_s) +{ + krb5_error_code retval; + krb5_data packet; + krb5_context context = NULL; + krb5_ccache ccdef = NULL; + krb5_auth_context auth_context = NULL; + krb5_enctype enc_types[] = { + ENCTYPE_AES256_CTS_HMAC_SHA1_96, + ENCTYPE_AES128_CTS_HMAC_SHA1_96, + ENCTYPE_ARCFOUR_HMAC, + ENCTYPE_NULL}; + bool ok; + + DBG_DEBUG("Getting ticket for service [%s] using creds from [%s] " + "and impersonating [%s]\n", + principal, ccname, impersonate_princ_s); + + retval = smb_krb5_init_context_common(&context); + if (retval != 0) { + DBG_ERR("kerberos init context failed (%s)\n", + error_message(retval)); + goto failed; + } + + if (time_offset != 0) { + krb5_set_real_time(context, time(NULL) + time_offset, 0); + } + + retval = krb5_cc_resolve(context, + ccname ? ccname : krb5_cc_default_name(context), + &ccdef); + if (retval != 0) { + DBG_WARNING("krb5_cc_default failed (%s)\n", + error_message(retval)); + goto failed; + } + + retval = krb5_set_default_tgs_ktypes(context, enc_types); + if (retval != 0) { + DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n", + error_message(retval)); + goto failed; + } + + retval = ads_krb5_mk_req(context, + &auth_context, + AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts, + principal, + ccdef, + &packet, + tgs_expire, + impersonate_princ_s); + if (retval != 0) { + goto failed; + } + + ok = smb_krb5_get_smb_session_key(mem_ctx, + context, + auth_context, + session_key_krb5, + false); + if (!ok) { + retval = ENOMEM; + goto failed; + } + + *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length); + + smb_krb5_free_data_contents(context, &packet); + +failed: + + if (context) { + if (ccdef) { + krb5_cc_close(context, ccdef); + } + if (auth_context) { + krb5_auth_con_free(context, auth_context); + } + krb5_free_context(context); + } + + return retval; +} + +#ifndef SAMBA4_USES_HEIMDAL /* MITKRB5 tracing callback */ +static void smb_krb5_trace_cb(krb5_context ctx, +#ifdef HAVE_KRB5_TRACE_INFO + const krb5_trace_info *info, +#elif defined(HAVE_KRB5_TRACE_INFO_STRUCT) + const struct krb5_trace_info *info, +#else +#error unknown krb5_trace_info +#endif + void *data) +{ + if (info != NULL) { + DBGC_DEBUG(DBGC_KERBEROS, "%s", info->message); + } +} +#endif + +krb5_error_code smb_krb5_init_context_common(krb5_context *_krb5_context) +{ + krb5_error_code ret; + krb5_context krb5_ctx; + + initialize_krb5_error_table(); + + ret = krb5_init_context(&krb5_ctx); + if (ret) { + DBG_ERR("Krb5 context initialization failed (%s)\n", + error_message(ret)); + return ret; + } + + /* The MIT Kerberos build relies on using the system krb5.conf file. + * If you really want to use another file please set KRB5_CONFIG + * accordingly. */ +#ifndef SAMBA4_USES_HEIMDAL + ret = krb5_set_trace_callback(krb5_ctx, smb_krb5_trace_cb, NULL); + if (ret) { + DBG_ERR("Failed to set MIT kerberos trace callback! (%s)\n", + error_message(ret)); + } +#endif + +#ifdef SAMBA4_USES_HEIMDAL + /* Set options in kerberos */ + krb5_set_dns_canonicalize_hostname(krb5_ctx, false); +#endif + + *_krb5_context = krb5_ctx; + return 0; +} + +#else /* HAVE_KRB5 */ +/* This saves a few linking headaches */ +int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx, + const char *principal, + time_t time_offset, + DATA_BLOB *ticket, + DATA_BLOB *session_key_krb5, + uint32_t extra_ap_opts, const char *ccname, + time_t *tgs_expire, + const char *impersonate_princ_s) +{ + DEBUG(0,("NO KERBEROS SUPPORT\n")); + return 1; +} + +#endif /* HAVE_KRB5 */ diff --git a/lib/krb5_wrap/krb5_samba.h b/lib/krb5_wrap/krb5_samba.h new file mode 100644 index 0000000..e158a40 --- /dev/null +++ b/lib/krb5_wrap/krb5_samba.h @@ -0,0 +1,443 @@ +/* + Unix SMB/CIFS implementation. + simple kerberos5 routines for active directory + Copyright (C) Andrew Tridgell 2001 + Copyright (C) Luke Howard 2002-2003 + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005 + Copyright (C) Guenther Deschner 2005-2009 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#ifndef _KRB5_SAMBA_H +#define _KRB5_SAMBA_H + +#include "lib/util/data_blob.h" +#include "libcli/util/ntstatus.h" + +#ifdef HAVE_KRB5 + +#define KRB5_PRIVATE 1 /* this file uses PRIVATE interfaces! */ +/* this file uses DEPRECATED interfaces! */ + +#ifdef KRB5_DEPRECATED +#undef KRB5_DEPRECATED +#endif + +#if defined(HAVE_KRB5_DEPRECATED_WITH_IDENTIFIER) +#define KRB5_DEPRECATED 1 +#else +#define KRB5_DEPRECATED +#endif + +#include "system/kerberos.h" +#include "system/network.h" + +#ifndef KRB5_ADDR_NETBIOS +#define KRB5_ADDR_NETBIOS 0x14 +#endif + +#ifndef KRB5KRB_ERR_RESPONSE_TOO_BIG +#define KRB5KRB_ERR_RESPONSE_TOO_BIG (-1765328332L) +#endif + +/* Heimdal uses a slightly different name */ +#if defined(HAVE_ENCTYPE_ARCFOUR_HMAC_MD5) && !defined(HAVE_ENCTYPE_ARCFOUR_HMAC) +#define ENCTYPE_ARCFOUR_HMAC ENCTYPE_ARCFOUR_HMAC_MD5 +#endif +#if defined(HAVE_ENCTYPE_ARCFOUR_HMAC_MD5_56) && !defined(HAVE_ENCTYPE_ARCFOUR_HMAC_EXP) +#define ENCTYPE_ARCFOUR_HMAC_EXP ENCTYPE_ARCFOUR_HMAC_MD5_56 +#endif + +/* The older versions of heimdal that don't have this + define don't seem to use it anyway. I'm told they + always use a subkey */ +#ifndef HAVE_AP_OPTS_USE_SUBKEY +#define AP_OPTS_USE_SUBKEY 0 +#endif + +#ifndef KRB5_PW_SALT +#define KRB5_PW_SALT 3 +#endif + +/* CKSUMTYPE_HMAC_MD5 in Heimdal + CKSUMTYPE_HMAC_MD5_ARCFOUR in MIT */ +#if defined(CKSUMTYPE_HMAC_MD5_ARCFOUR) && !defined(CKSUMTYPE_HMAC_MD5) +#define CKSUMTYPE_HMAC_MD5 CKSUMTYPE_HMAC_MD5_ARCFOUR +#endif + +/* + * CKSUMTYPE_HMAC_SHA1_96_AES_* in Heimdal + * CKSUMTYPE_HMAC_SHA1_96_AES* in MIT + */ +#if defined(CKSUMTYPE_HMAC_SHA1_96_AES128) && !defined(CKSUMTYPE_HMAC_SHA1_96_AES_128) +#define CKSUMTYPE_HMAC_SHA1_96_AES_128 CKSUMTYPE_HMAC_SHA1_96_AES128 +#endif +#if defined(CKSUMTYPE_HMAC_SHA1_96_AES256) && !defined(CKSUMTYPE_HMAC_SHA1_96_AES_256) +#define CKSUMTYPE_HMAC_SHA1_96_AES_256 CKSUMTYPE_HMAC_SHA1_96_AES256 +#endif + +/* + * KRB5_KU_OTHER_ENCRYPTED in Heimdal + * KRB5_KEYUSAGE_APP_DATA_ENCRYPT in MIT + */ +#if defined(KRB5_KEYUSAGE_APP_DATA_ENCRYPT) && !defined(KRB5_KU_OTHER_ENCRYPTED) +#define KRB5_KU_OTHER_ENCRYPTED KRB5_KEYUSAGE_APP_DATA_ENCRYPT +#endif + +typedef struct { +#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ + krb5_address **addrs; +#elif defined(HAVE_KRB5_ADDRESSES) /* Heimdal */ + krb5_addresses *addrs; +#else +#error UNKNOWN_KRB5_ADDRESS_TYPE +#endif /* defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) */ +} smb_krb5_addresses; + +#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY /* MIT */ +#define KRB5_KT_KEY(k) (&(k)->key) +#elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK) /* Heimdal */ +#define KRB5_KT_KEY(k) (&(k)->keyblock) +#else +#error krb5_keytab_entry has no key or keyblock member +#endif /* HAVE_KRB5_KEYTAB_ENTRY_KEY */ + +/* work around broken krb5.h on sles9 */ +#ifdef SIZEOF_LONG +#undef SIZEOF_LONG +#endif + +#ifdef HAVE_KRB5_KEYBLOCK_KEYVALUE /* Heimdal */ +#define KRB5_KEY_TYPE(k) ((k)->keytype) +#define KRB5_KEY_LENGTH(k) ((k)->keyvalue.length) +#define KRB5_KEY_DATA(k) ((k)->keyvalue.data) +#define KRB5_KEY_DATA_CAST void +#else /* MIT */ +#define KRB5_KEY_TYPE(k) ((k)->enctype) +#define KRB5_KEY_LENGTH(k) ((k)->length) +#define KRB5_KEY_DATA(k) ((k)->contents) +#define KRB5_KEY_DATA_CAST krb5_octet +#endif /* HAVE_KRB5_KEYBLOCK_KEYVALUE */ + +#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */ +#define KRB5_ERROR_CODE(k) ((k)->error_code) +#else /* MIT */ +#define KRB5_ERROR_CODE(k) ((k)->error) +#endif /* HAVE_E_DATA_POINTER_IN_KRB5_ERROR */ + +#ifndef HAVE_KRB5_CONST_PAC +#ifdef KRB5_CONST_PAC_GET_BUFFER +typedef const struct krb5_pac_data *krb5_const_pac; +#else +/* + * Certain Heimdal versions include a version of krb5_pac_get_buffer() that is + * unusable in certain cases, taking a krb5_pac when a krb5_const_pac may be all + * that we can supply. Furthermore, MIT Kerberos doesn't declare krb5_const_pac + * at all. In such cases, we must declare krb5_const_pac as a non-const typedef + * so that the build can succeed. + */ +typedef struct krb5_pac_data *krb5_const_pac; +#endif +#endif + +krb5_error_code smb_krb5_parse_name(krb5_context context, + const char *name, /* in unix charset */ + krb5_principal *principal); + +krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_const_principal principal, + char **unix_name); + +krb5_error_code smb_krb5_init_context_common(krb5_context *_krb5_context); + +krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc); + +#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) +krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context, krb5_auth_context auth_context, krb5_keyblock *keyblock); +#endif + +#ifndef HAVE_KRB5_FREE_UNPARSED_NAME +void krb5_free_unparsed_name(krb5_context ctx, char *val); +#endif + +#if !defined(HAVE_KRB5_FREE_ENCTYPES) +void krb5_free_enctypes(krb5_context context, krb5_enctype *val); +#endif + +#if !defined(HAVE_KRB5_FREE_STRING) +void krb5_free_string(krb5_context context, char *val); +#endif + +/* Stub out initialize_krb5_error_table since it is not present in all + * Kerberos implementations. If it's not present, it's not necessary to + * call it. + */ +#ifndef HAVE_INITIALIZE_KRB5_ERROR_TABLE +#define initialize_krb5_error_table() +#endif + +/* Samba wrapper functions for krb5 functionality. */ +bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr, + krb5_address *pkaddr); + +krb5_error_code smb_krb5_mk_error(krb5_context context, + krb5_error_code error_code, + const char *e_text, + krb5_data *e_data, + const krb5_principal client, + const krb5_principal server, + krb5_data *enc_err); + +krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context, + krb5_enctype **enctypes); + +bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_auth_context auth_context, + DATA_BLOB *session_key, + bool remote); + +krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry); +void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata); +krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, const char *client_string, const char *service_string, time_t *expire_time); +krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr, + const char *netbios_name); +krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr); +krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry); + +krb5_error_code smb_krb5_enctype_to_string(krb5_context context, + krb5_enctype enctype, + char **etype_s); +krb5_error_code smb_krb5_kt_open_relative(krb5_context context, + const char *keytab_name_req, + bool write_access, + krb5_keytab *keytab); +krb5_error_code smb_krb5_kt_open(krb5_context context, + const char *keytab_name, + bool write_access, + krb5_keytab *keytab); +krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_keytab keytab, + const char **keytab_name); +krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context, + krb5_keytab keytab, + bool keep_old_kvno, + krb5_kvno kvno, + bool enctype_only, + krb5_enctype enctype, + const char *princ_s, + krb5_principal princ, + bool flush); +krb5_error_code smb_krb5_kt_add_entry(krb5_context context, + krb5_keytab keytab, + krb5_kvno kvno, + const char *princ_s, + const char *salt_principal, + krb5_enctype enctype, + krb5_data *password, + bool no_salt); + +krb5_error_code smb_krb5_get_credentials(krb5_context context, + krb5_ccache ccache, + krb5_principal me, + krb5_principal server, + krb5_principal impersonate_princ, + krb5_creds **out_creds); +krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context, + krb5_enctype enctype, + const void *data, + size_t length, + krb5_keyblock *key); +krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx, + krb5_ccache cc, + krb5_principal principal, + krb5_keyblock *keyblock, + const char *target_service, + krb5_get_init_creds_opt *krb_options, + time_t *expire_time, + time_t *kdc_time); +krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx, + krb5_ccache cc, + krb5_principal principal, + const char *password, + const char *target_service, + krb5_get_init_creds_opt *krb_options, + time_t *expire_time, + time_t *kdc_time); +krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx, + krb5_ccache store_cc, + krb5_principal init_principal, + const char *init_password, + krb5_principal impersonate_principal, + const char *self_service, + const char *target_service, + krb5_get_init_creds_opt *krb_options, + time_t *expire_time, + time_t *kdc_time); + +#if defined(HAVE_KRB5_MAKE_PRINCIPAL) +#define smb_krb5_make_principal krb5_make_principal +#elif defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA) +krb5_error_code smb_krb5_make_principal(krb5_context context, + krb5_principal *principal, + const char *realm, ...); +#else +#error krb5_make_principal not available +#endif + +#if defined(HAVE_KRB5_CC_GET_LIFETIME) +#define smb_krb5_cc_get_lifetime krb5_cc_get_lifetime +#elif defined(HAVE_KRB5_CC_RETRIEVE_CRED) +krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context, + krb5_ccache id, + time_t *t); +#else +#error krb5_cc_get_lifetime not available +#endif + +#if defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) +#define smb_krb5_free_checksum_contents krb5_free_checksum_contents +#elif defined (HAVE_FREE_CHECKSUM) +void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum); +#else +#error krb5_free_checksum_contents/free_Checksum is not available +#endif + +krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx, + DATA_BLOB *pac_data, + krb5_context context, + const krb5_keyblock *keyblock, + uint32_t *sig_type, + DATA_BLOB *sig_blob); + +char *smb_krb5_principal_get_realm(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_const_principal principal); + +void smb_krb5_principal_set_type(krb5_context context, + krb5_principal principal, + int type); + +int smb_krb5_principal_is_tgs(krb5_context context, + krb5_const_principal principal); + +krb5_error_code smb_krb5_principal_set_realm(krb5_context context, + krb5_principal principal, + const char *realm); + +char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx, + const char *hostname, + const char *client_realm); + +char *smb_get_krb5_error_message(krb5_context context, + krb5_error_code code, + TALLOC_CTX *mem_ctx); + +#if defined(HAVE_KRB5_KT_COMPARE) +#define smb_krb5_kt_compare krb5_kt_compare +#else +krb5_boolean smb_krb5_kt_compare(krb5_context context, + krb5_keytab_entry *entry, + krb5_const_principal principal, + krb5_kvno vno, + krb5_enctype enctype); +#endif + +const krb5_enctype *samba_all_enctypes(void); + +uint32_t kerberos_enctype_to_bitmap(krb5_enctype enc_type_enum); +krb5_enctype ms_suptype_to_ietf_enctype(uint32_t enctype_bitmap); +krb5_error_code ms_suptypes_to_ietf_enctypes(TALLOC_CTX *mem_ctx, + uint32_t enctype_bitmap, + krb5_enctype **enctypes); +int smb_krb5_get_pw_salt(krb5_context context, + krb5_const_principal host_princ, + krb5_data *psalt); +int smb_krb5_salt_principal(krb5_context krb5_ctx, + const char *realm, + const char *sAMAccountName, + const char *userPrincipalName, + uint32_t uac_flags, + krb5_principal *salt_princ); + +int smb_krb5_salt_principal_str(const char *realm, + const char *sAMAccountName, + const char *userPrincipalName, + uint32_t uac_flags, + TALLOC_CTX *mem_ctx, + char **_salt_principal); +int smb_krb5_salt_principal2data(krb5_context context, + const char *salt_principal, + TALLOC_CTX *mem_ctx, + char **_salt_data); + +int smb_krb5_create_key_from_string(krb5_context context, + krb5_const_principal host_princ, + const krb5_data *salt, + const krb5_data *password, + krb5_enctype enctype, + krb5_keyblock *key); + +#ifndef krb5_princ_size +#if defined(HAVE_KRB5_PRINCIPAL_GET_NUM_COMP) +#define krb5_princ_size krb5_principal_get_num_comp +#else +#error krb5_princ_size unavailable +#endif +#endif + +krb5_error_code smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_const_principal principal, + unsigned int component, + char **out); + +krb5_error_code smb_krb5_copy_data_contents(krb5_data *p, + const void *data, + size_t len); + +krb5_data smb_krb5_make_data(void *data, + size_t len); + +krb5_data smb_krb5_data_from_blob(DATA_BLOB blob); + +int smb_krb5_principal_get_type(krb5_context context, + krb5_const_principal principal); + +#if !defined(HAVE_KRB5_WARNX) +krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...) + PRINTF_ATTRIBUTE(2, 0); +#endif + +krb5_error_code smb_krb5_cc_copy_creds(krb5_context context, + krb5_ccache incc, krb5_ccache outcc); + +#endif /* HAVE_KRB5 */ + +int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx, + const char *principal, + time_t time_offset, + DATA_BLOB *ticket, + DATA_BLOB *session_key_krb5, + uint32_t extra_ap_opts, const char *ccname, + time_t *tgs_expire, + const char *impersonate_princ_s); + +NTSTATUS krb5_to_nt_status(krb5_error_code kerberos_error); +krb5_error_code nt_status_to_krb5(NTSTATUS nt_status); + +#endif /* _KRB5_SAMBA_H */ diff --git a/lib/krb5_wrap/wscript_build b/lib/krb5_wrap/wscript_build new file mode 100644 index 0000000..dd9fc08 --- /dev/null +++ b/lib/krb5_wrap/wscript_build @@ -0,0 +1,23 @@ +#!/usr/bin/env python + +add_deps = '' +if bld.CONFIG_SET('SAMBA4_USES_HEIMDAL'): + add_deps = ' asn1' + +bld.SAMBA_LIBRARY('krb5samba', + source=''' + krb5_samba.c + gss_samba.c + keytab_util.c + enctype_convert.c + krb5_errs.c + ''', + deps=''' + samba-util + talloc + krb5 + com_err + gssapi + ''' + add_deps, + private_library=True + ) diff --git a/lib/krb5_wrap/wscript_configure b/lib/krb5_wrap/wscript_configure new file mode 100644 index 0000000..b595eef --- /dev/null +++ b/lib/krb5_wrap/wscript_configure @@ -0,0 +1,18 @@ +#!/usr/bin/env python + +# Check whether we have the krb5_const_pac type, if we aren't sure already. +if conf.CONFIG_SET('HAVE_KRB5_CONST_PAC') or ( + conf.CHECK_TYPE('krb5_const_pac', + headers='krb5.h', + lib='krb5')): + # If the type is available, check whether krb5_pac_get_buffer() accepts it + # as its second parameter, or whether it takes krb5_pac instead. + conf.CHECK_C_PROTOTYPE('krb5_pac_get_buffer', + 'krb5_error_code krb5_pac_get_buffer(' + ' krb5_context context,' + ' krb5_const_pac p,' + ' uint32_t type,' + ' krb5_data *data)', + define='KRB5_CONST_PAC_GET_BUFFER', + headers='krb5.h', + lib='krb5') |