diff options
Diffstat (limited to 'third_party/heimdal/lib/krb5/verify_init.c')
| -rw-r--r-- | third_party/heimdal/lib/krb5/verify_init.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/krb5/verify_init.c b/third_party/heimdal/lib/krb5/verify_init.c new file mode 100644 index 0000000..128502f --- /dev/null +++ b/third_party/heimdal/lib/krb5/verify_init.c @@ -0,0 +1,246 @@ +/* + * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * 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 "krb5_locl.h" + +KRB5_LIB_FUNCTION void KRB5_LIB_CALL +krb5_verify_init_creds_opt_init(krb5_verify_init_creds_opt *options) +{ + memset (options, 0, sizeof(*options)); +} + +KRB5_LIB_FUNCTION void KRB5_LIB_CALL +krb5_verify_init_creds_opt_set_ap_req_nofail(krb5_verify_init_creds_opt *options, + int ap_req_nofail) +{ + options->flags |= KRB5_VERIFY_INIT_CREDS_OPT_AP_REQ_NOFAIL; + options->ap_req_nofail = ap_req_nofail; +} + +/* + * + */ + +static krb5_boolean +fail_verify_is_ok (krb5_context context, + krb5_verify_init_creds_opt *options) +{ + + if (options && (options->flags & KRB5_VERIFY_INIT_CREDS_OPT_AP_REQ_NOFAIL) + && options->ap_req_nofail != 0) + return FALSE; + + if (krb5_config_get_bool(context, + NULL, + "libdefaults", + "verify_ap_req_nofail", + NULL)) + return FALSE; + + return TRUE; +} + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +krb5_verify_init_creds(krb5_context context, + krb5_creds *creds, + krb5_principal ap_req_server, + krb5_keytab ap_req_keytab, + krb5_ccache *ccache, + krb5_verify_init_creds_opt *options) +{ + krb5_error_code ret; + krb5_data req; + krb5_ccache local_ccache = NULL; + krb5_creds *new_creds = NULL; + krb5_auth_context auth_context = NULL; + krb5_principal server = NULL; + krb5_keytab keytab = NULL; + + krb5_data_zero (&req); + + if (ap_req_server == NULL) { + char local_hostname[MAXHOSTNAMELEN]; + + if (gethostname (local_hostname, sizeof(local_hostname)) < 0) { + ret = errno; + krb5_set_error_message (context, ret, "gethostname: %s", + strerror(ret)); + return ret; + } + + ret = krb5_sname_to_principal (context, + local_hostname, + "host", + KRB5_NT_SRV_HST, + &server); + if (ret) + goto cleanup; + } else + server = ap_req_server; + + if (ap_req_keytab == NULL) { + ret = krb5_kt_default (context, &keytab); + if (ret) + goto cleanup; + } else + keytab = ap_req_keytab; + + if (ccache && *ccache) + local_ccache = *ccache; + else { + ret = krb5_cc_new_unique(context, krb5_cc_type_memory, + NULL, &local_ccache); + if (ret) + goto cleanup; + ret = krb5_cc_initialize (context, + local_ccache, + creds->client); + if (ret) + goto cleanup; + ret = krb5_cc_store_cred (context, + local_ccache, + creds); + if (ret) + goto cleanup; + } + + if (!krb5_principal_compare (context, server, creds->server)) { + krb5_creds match_cred; + + memset (&match_cred, 0, sizeof(match_cred)); + + match_cred.client = creds->client; + match_cred.server = server; + + ret = krb5_get_credentials (context, + 0, + local_ccache, + &match_cred, + &new_creds); + if (ret) { + if (fail_verify_is_ok (context, options)) + ret = 0; + goto cleanup; + } + creds = new_creds; + } + + ret = krb5_mk_req_extended (context, + &auth_context, + 0, + NULL, + creds, + &req); + + krb5_auth_con_free (context, auth_context); + auth_context = NULL; + + if (ret) + goto cleanup; + + ret = krb5_rd_req (context, + &auth_context, + &req, + server, + keytab, + 0, + NULL); + + if (ret == KRB5_KT_NOTFOUND && fail_verify_is_ok (context, options)) + ret = 0; +cleanup: + if (auth_context) + krb5_auth_con_free (context, auth_context); + krb5_data_free (&req); + if (new_creds != NULL) + krb5_free_creds (context, new_creds); + if (ap_req_server == NULL && server) + krb5_free_principal (context, server); + if (ap_req_keytab == NULL && keytab) + krb5_kt_close (context, keytab); + if (local_ccache != NULL + && + (ccache == NULL + || (ret != 0 && *ccache == NULL))) + krb5_cc_destroy (context, local_ccache); + + if (ret == 0 && ccache != NULL && *ccache == NULL) + *ccache = local_ccache; + + return ret; +} + +/** + * Validate the newly fetch credential, see also krb5_verify_init_creds(). + * + * @param context a Kerberos 5 context + * @param creds the credentials to verify + * @param client the client name to match up + * @param ccache the credential cache to use + * @param service a service name to use, used with + * krb5_sname_to_principal() to build a hostname to use to + * verify. + * + * @ingroup krb5_ccache + */ + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +krb5_get_validated_creds(krb5_context context, + krb5_creds *creds, + krb5_principal client, + krb5_ccache ccache, + char *service) +{ + krb5_verify_init_creds_opt vopt; + krb5_principal server; + krb5_error_code ret; + + if (krb5_principal_compare(context, creds->client, client) != TRUE) { + krb5_set_error_message(context, KRB5_PRINC_NOMATCH, + N_("Validation credentials and client " + "doesn't match", "")); + return KRB5_PRINC_NOMATCH; + } + + ret = krb5_sname_to_principal (context, NULL, service, + KRB5_NT_SRV_HST, &server); + if(ret) + return ret; + + krb5_verify_init_creds_opt_init(&vopt); + + ret = krb5_verify_init_creds(context, creds, server, NULL, NULL, &vopt); + krb5_free_principal(context, server); + + return ret; +} |