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Diffstat (limited to '')
| -rw-r--r-- | source3/libnet/libnet_keytab.c | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/source3/libnet/libnet_keytab.c b/source3/libnet/libnet_keytab.c new file mode 100644 index 0000000..ea4fd5e --- /dev/null +++ b/source3/libnet/libnet_keytab.c @@ -0,0 +1,457 @@ +/* + Unix SMB/CIFS implementation. + dump the remote SAM using rpc samsync operations + + Copyright (C) Guenther Deschner 2008. + Copyright (C) Michael Adam 2008 + + 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 "smb_krb5.h" +#include "ads.h" +#include "secrets.h" +#include "libnet/libnet_keytab.h" + +#ifdef HAVE_KRB5 + +/**************************************************************** +****************************************************************/ + +static int keytab_close(struct libnet_keytab_context *ctx) +{ + if (!ctx) { + return 0; + } + + if (ctx->keytab && ctx->context) { + krb5_kt_close(ctx->context, ctx->keytab); + } + + if (ctx->context) { + krb5_free_context(ctx->context); + } + + TALLOC_FREE(ctx->ads); + + TALLOC_FREE(ctx); + + return 0; +} + +/**************************************************************** +****************************************************************/ + +krb5_error_code libnet_keytab_init(TALLOC_CTX *mem_ctx, + const char *keytab_name, + struct libnet_keytab_context **ctx) +{ + krb5_error_code ret = 0; + krb5_context context = NULL; + krb5_keytab keytab = NULL; + const char *keytab_string = NULL; + + struct libnet_keytab_context *r; + + r = talloc_zero(mem_ctx, struct libnet_keytab_context); + if (!r) { + return ENOMEM; + } + + talloc_set_destructor(r, keytab_close); + + ret = smb_krb5_init_context_common(&context); + if (ret) { + DBG_ERR("kerberos init context failed (%s)\n", + error_message(ret)); + return ret; + } + + ret = smb_krb5_kt_open_relative(context, + keytab_name, + true, /* write_access */ + &keytab); + if (ret) { + DBG_WARNING("smb_krb5_kt_open_relative failed (%s)\n", + error_message(ret)); + krb5_free_context(context); + return ret; + } + + ret = smb_krb5_kt_get_name(mem_ctx, context, keytab, &keytab_string); + if (ret) { + krb5_kt_close(context, keytab); + krb5_free_context(context); + return ret; + } + + r->context = context; + r->keytab = keytab; + r->keytab_name = keytab_string; + r->clean_old_entries = false; + + *ctx = r; + + return 0; +} + +/**************************************************************** +****************************************************************/ + +/** + * Remove all entries that have the given principal, kvno and enctype. + */ +static krb5_error_code libnet_keytab_remove_entries(krb5_context context, + krb5_keytab keytab, + const char *principal, + int kvno, + const krb5_enctype enctype, + bool ignore_kvno) +{ + krb5_error_code ret; + krb5_kt_cursor cursor; + krb5_keytab_entry kt_entry; + + ZERO_STRUCT(kt_entry); + ZERO_STRUCT(cursor); + + ret = krb5_kt_start_seq_get(context, keytab, &cursor); + if (ret) { + return 0; + } + + while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) + { + krb5_keyblock *keyp; + char *princ_s = NULL; + + if (kt_entry.vno != kvno && !ignore_kvno) { + goto cont; + } + + keyp = KRB5_KT_KEY(&kt_entry); + + if (KRB5_KEY_TYPE(keyp) != enctype) { + goto cont; + } + + ret = smb_krb5_unparse_name(talloc_tos(), context, kt_entry.principal, + &princ_s); + if (ret) { + DEBUG(5, ("smb_krb5_unparse_name failed (%s)\n", + error_message(ret))); + goto cont; + } + + if (strcmp(principal, princ_s) != 0) { + goto cont; + } + + /* match found - remove */ + + DEBUG(10, ("found entry for principal %s, kvno %d, " + "enctype %d - trying to remove it\n", + princ_s, kt_entry.vno, KRB5_KEY_TYPE(keyp))); + + ret = krb5_kt_end_seq_get(context, keytab, &cursor); + ZERO_STRUCT(cursor); + if (ret) { + DEBUG(5, ("krb5_kt_end_seq_get failed (%s)\n", + error_message(ret))); + goto cont; + } + + ret = krb5_kt_remove_entry(context, keytab, + &kt_entry); + if (ret) { + DEBUG(5, ("krb5_kt_remove_entry failed (%s)\n", + error_message(ret))); + goto cont; + } + DEBUG(10, ("removed entry for principal %s, kvno %d, " + "enctype %d\n", princ_s, kt_entry.vno, + KRB5_KEY_TYPE(keyp))); + + ret = krb5_kt_start_seq_get(context, keytab, &cursor); + if (ret) { + DEBUG(5, ("krb5_kt_start_seq_get failed (%s)\n", + error_message(ret))); + goto cont; + } + +cont: + smb_krb5_kt_free_entry(context, &kt_entry); + TALLOC_FREE(princ_s); + } + + ret = krb5_kt_end_seq_get(context, keytab, &cursor); + if (ret) { + DEBUG(5, ("krb5_kt_end_seq_get failed (%s)\n", + error_message(ret))); + } + + return ret; +} + +static krb5_error_code libnet_keytab_add_entry(krb5_context context, + krb5_keytab keytab, + krb5_kvno kvno, + const char *princ_s, + krb5_enctype enctype, + krb5_data password) +{ + krb5_keyblock *keyp; + krb5_keytab_entry kt_entry; + krb5_error_code ret; + krb5_principal salt_princ = NULL; + char *salt_princ_s; + + /* remove duplicates first ... */ + ret = libnet_keytab_remove_entries(context, keytab, princ_s, kvno, + enctype, false); + if (ret) { + DEBUG(1, ("libnet_keytab_remove_entries failed: %s\n", + error_message(ret))); + } + + ZERO_STRUCT(kt_entry); + + kt_entry.vno = kvno; + + ret = smb_krb5_parse_name(context, princ_s, &kt_entry.principal); + if (ret) { + DEBUG(1, ("smb_krb5_parse_name(%s) failed (%s)\n", + princ_s, error_message(ret))); + return ret; + } + + keyp = KRB5_KT_KEY(&kt_entry); + + salt_princ_s = kerberos_secrets_fetch_salt_princ(); + if (salt_princ_s == NULL) { + ret = KRB5KRB_ERR_GENERIC; + goto done; + } + + ret = krb5_parse_name(context, salt_princ_s, &salt_princ); + SAFE_FREE(salt_princ_s); + if (ret != 0) { + ret = KRB5KRB_ERR_GENERIC; + goto done; + } + + ret = create_kerberos_key_from_string(context, + kt_entry.principal, + salt_princ, + &password, + keyp, + enctype, + true); + krb5_free_principal(context, salt_princ); + if (ret != 0) { + ret = KRB5KRB_ERR_GENERIC; + goto done; + } + + ret = krb5_kt_add_entry(context, keytab, &kt_entry); + if (ret) { + DEBUG(1, ("adding entry to keytab failed (%s)\n", + error_message(ret))); + } + +done: + krb5_free_keyblock_contents(context, keyp); + krb5_free_principal(context, kt_entry.principal); + ZERO_STRUCT(kt_entry); + smb_krb5_kt_free_entry(context, &kt_entry); + + return ret; +} + +krb5_error_code libnet_keytab_add(struct libnet_keytab_context *ctx) +{ + krb5_error_code ret = 0; + uint32_t i; + + + if (ctx->clean_old_entries) { + DEBUG(0, ("cleaning old entries...\n")); + for (i=0; i < ctx->count; i++) { + struct libnet_keytab_entry *entry = &ctx->entries[i]; + + ret = libnet_keytab_remove_entries(ctx->context, + ctx->keytab, + entry->principal, + 0, + entry->enctype, + true); + if (ret) { + DEBUG(1,("libnet_keytab_add: Failed to remove " + "old entries for %s (enctype %u): %s\n", + entry->principal, entry->enctype, + error_message(ret))); + return ret; + } + } + } + + for (i=0; i<ctx->count; i++) { + + struct libnet_keytab_entry *entry = &ctx->entries[i]; + krb5_data password; + + ZERO_STRUCT(password); + password.data = (char *)entry->password.data; + password.length = entry->password.length; + + ret = libnet_keytab_add_entry(ctx->context, + ctx->keytab, + entry->kvno, + entry->principal, + entry->enctype, + password); + if (ret) { + DEBUG(1,("libnet_keytab_add: " + "Failed to add entry to keytab file\n")); + return ret; + } + } + + return ret; +} + +struct libnet_keytab_entry *libnet_keytab_search(struct libnet_keytab_context *ctx, + const char *principal, + int kvno, + const krb5_enctype enctype, + TALLOC_CTX *mem_ctx) +{ + krb5_error_code ret = 0; + krb5_kt_cursor cursor; + krb5_keytab_entry kt_entry; + struct libnet_keytab_entry *entry = NULL; + + ZERO_STRUCT(kt_entry); + ZERO_STRUCT(cursor); + + ret = krb5_kt_start_seq_get(ctx->context, ctx->keytab, &cursor); + if (ret) { + DEBUG(10, ("krb5_kt_start_seq_get failed: %s\n", + error_message(ret))); + return NULL; + } + + while (krb5_kt_next_entry(ctx->context, ctx->keytab, &kt_entry, &cursor) == 0) + { + krb5_keyblock *keyp; + char *princ_s = NULL; + + entry = NULL; + + if (kt_entry.vno != kvno) { + goto cont; + } + + keyp = KRB5_KT_KEY(&kt_entry); + + if (KRB5_KEY_TYPE(keyp) != enctype) { + goto cont; + } + + entry = talloc_zero(mem_ctx, struct libnet_keytab_entry); + if (!entry) { + DEBUG(3, ("talloc failed\n")); + goto fail; + } + + ret = smb_krb5_unparse_name(entry, ctx->context, kt_entry.principal, + &princ_s); + if (ret) { + goto cont; + } + + if (strcmp(principal, princ_s) != 0) { + goto cont; + } + + entry->principal = talloc_strdup(entry, princ_s); + if (!entry->principal) { + DEBUG(3, ("talloc_strdup_failed\n")); + goto fail; + } + + entry->name = talloc_move(entry, &princ_s); + + entry->password = data_blob_talloc(entry, KRB5_KEY_DATA(keyp), + KRB5_KEY_LENGTH(keyp)); + if (!entry->password.data) { + DEBUG(3, ("data_blob_talloc failed\n")); + goto fail; + } + + DEBUG(10, ("found entry\n")); + + smb_krb5_kt_free_entry(ctx->context, &kt_entry); + break; + +fail: + smb_krb5_kt_free_entry(ctx->context, &kt_entry); + TALLOC_FREE(entry); + break; + +cont: + smb_krb5_kt_free_entry(ctx->context, &kt_entry); + TALLOC_FREE(entry); + continue; + } + + krb5_kt_end_seq_get(ctx->context, ctx->keytab, &cursor); + return entry; +} + +/** + * Helper function to add data to the list + * of keytab entries. It builds the prefix from the input. + */ +NTSTATUS libnet_keytab_add_to_keytab_entries(TALLOC_CTX *mem_ctx, + struct libnet_keytab_context *ctx, + uint32_t kvno, + const char *name, + const char *prefix, + const krb5_enctype enctype, + DATA_BLOB blob) +{ + struct libnet_keytab_entry entry; + + entry.kvno = kvno; + entry.name = talloc_strdup(mem_ctx, name); + entry.principal = talloc_asprintf(mem_ctx, "%s%s%s@%s", + prefix ? prefix : "", + prefix ? "/" : "", + name, ctx->dns_domain_name); + entry.enctype = enctype; + entry.password = blob; + NT_STATUS_HAVE_NO_MEMORY(entry.name); + NT_STATUS_HAVE_NO_MEMORY(entry.principal); + NT_STATUS_HAVE_NO_MEMORY(entry.password.data); + + ADD_TO_ARRAY(mem_ctx, struct libnet_keytab_entry, entry, + &ctx->entries, &ctx->count); + NT_STATUS_HAVE_NO_MEMORY(ctx->entries); + + return NT_STATUS_OK; +} + +#endif /* HAVE_KRB5 */ |