139384277SMark Murray /*- 2e0bc7412SJacques Vidrine * This pam_krb5 module contains code that is: 3e0bc7412SJacques Vidrine * Copyright (c) Derrick J. Brashear, 1996. All rights reserved. 4e0bc7412SJacques Vidrine * Copyright (c) Frank Cusack, 1999-2001. All rights reserved. 5e0bc7412SJacques Vidrine * Copyright (c) Jacques A. Vidrine, 2000-2001. All rights reserved. 6e0bc7412SJacques Vidrine * Copyright (c) Nicolas Williams, 2001. All rights reserved. 7e0bc7412SJacques Vidrine * Copyright (c) Perot Systems Corporation, 2001. All rights reserved. 8e0bc7412SJacques Vidrine * Copyright (c) Mark R V Murray, 2001. All rights reserved. 916417879SRobert Watson * Copyright (c) Networks Associates Technology, Inc., 2002-2005. 10111ccd25SDag-Erling Smørgrav * All rights reserved. 11111ccd25SDag-Erling Smørgrav * 12111ccd25SDag-Erling Smørgrav * Portions of this software were developed for the FreeBSD Project by 13111ccd25SDag-Erling Smørgrav * ThinkSec AS and NAI Labs, the Security Research Division of Network 14111ccd25SDag-Erling Smørgrav * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 15111ccd25SDag-Erling Smørgrav * ("CBOSS"), as part of the DARPA CHATS research program. 1639384277SMark Murray * 1739384277SMark Murray * Redistribution and use in source and binary forms, with or without 1839384277SMark Murray * modification, are permitted provided that the following conditions 1939384277SMark Murray * are met: 2039384277SMark Murray * 1. Redistributions of source code must retain the above copyright 21e0bc7412SJacques Vidrine * notices, and the entire permission notice in its entirety, 2239384277SMark Murray * including the disclaimer of warranties. 2339384277SMark Murray * 2. Redistributions in binary form must reproduce the above copyright 2439384277SMark Murray * notice, this list of conditions and the following disclaimer in the 2539384277SMark Murray * documentation and/or other materials provided with the distribution. 2639384277SMark Murray * 3. The name of the author may not be used to endorse or promote 2739384277SMark Murray * products derived from this software without specific prior 2839384277SMark Murray * written permission. 2939384277SMark Murray * 3039384277SMark Murray * ALTERNATIVELY, this product may be distributed under the terms of 3139384277SMark Murray * the GNU Public License, in which case the provisions of the GPL are 3239384277SMark Murray * required INSTEAD OF the above restrictions. (This clause is 3339384277SMark Murray * necessary due to a potential bad interaction between the GPL and 3439384277SMark Murray * the restrictions contained in a BSD-style copyright.) 3539384277SMark Murray * 3639384277SMark Murray * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 3739384277SMark Murray * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 3839384277SMark Murray * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 3939384277SMark Murray * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 4039384277SMark Murray * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 4139384277SMark Murray * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 4239384277SMark Murray * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4339384277SMark Murray * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 4439384277SMark Murray * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 4539384277SMark Murray * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 4639384277SMark Murray * OF THE POSSIBILITY OF SUCH DAMAGE. 4739384277SMark Murray * 4839384277SMark Murray */ 4939384277SMark Murray 50ceaf33f5SMatthew Dillon #include <sys/cdefs.h> 51ceaf33f5SMatthew Dillon __FBSDID("$FreeBSD$"); 52ceaf33f5SMatthew Dillon 5339384277SMark Murray #include <sys/types.h> 5439384277SMark Murray #include <sys/stat.h> 5539384277SMark Murray #include <errno.h> 5639384277SMark Murray #include <limits.h> 5739384277SMark Murray #include <pwd.h> 5839384277SMark Murray #include <stdio.h> 5939384277SMark Murray #include <stdlib.h> 60111ccd25SDag-Erling Smørgrav #include <string.h> 6139384277SMark Murray #include <syslog.h> 6239384277SMark Murray #include <unistd.h> 6339384277SMark Murray 6439384277SMark Murray #include <krb5.h> 6539384277SMark Murray #include <com_err.h> 6639384277SMark Murray 6739384277SMark Murray #define PAM_SM_AUTH 6839384277SMark Murray #define PAM_SM_ACCOUNT 6939384277SMark Murray #define PAM_SM_PASSWORD 7039384277SMark Murray 7139384277SMark Murray #include <security/pam_appl.h> 7239384277SMark Murray #include <security/pam_modules.h> 738c66575dSDag-Erling Smørgrav #include <security/pam_mod_misc.h> 74545aa471SDag-Erling Smørgrav #include <security/openpam.h> 7539384277SMark Murray 7639384277SMark Murray #define COMPAT_HEIMDAL 7739384277SMark Murray /* #define COMPAT_MIT */ 7839384277SMark Murray 79813847e4SCy Schubert static int verify_krb_v5_tgt_begin(krb5_context, char *, int, 80813847e4SCy Schubert const char **, krb5_principal *, char[static BUFSIZ]); 81813847e4SCy Schubert static int verify_krb_v5_tgt(krb5_context, krb5_ccache, char *, int, 82813847e4SCy Schubert const char *, krb5_principal, char[static BUFSIZ]); 83813847e4SCy Schubert static void verify_krb_v5_tgt_cleanup(krb5_context, int, 84813847e4SCy Schubert const char *, krb5_principal, char[static BUFSIZ]); 8539384277SMark Murray static void cleanup_cache(pam_handle_t *, void *, int); 8639384277SMark Murray static const char *compat_princ_component(krb5_context, krb5_principal, int); 8739384277SMark Murray static void compat_free_data_contents(krb5_context, krb5_data *); 8839384277SMark Murray 8939384277SMark Murray #define USER_PROMPT "Username: " 9039384277SMark Murray #define PASSWORD_PROMPT "Password:" 9139384277SMark Murray #define NEW_PASSWORD_PROMPT "New Password:" 9239384277SMark Murray 93545aa471SDag-Erling Smørgrav #define PAM_OPT_CCACHE "ccache" 9416417879SRobert Watson #define PAM_OPT_DEBUG "debug" 95545aa471SDag-Erling Smørgrav #define PAM_OPT_FORWARDABLE "forwardable" 96545aa471SDag-Erling Smørgrav #define PAM_OPT_NO_CCACHE "no_ccache" 97551e75c7SMartin Matuska #define PAM_OPT_NO_USER_CHECK "no_user_check" 98545aa471SDag-Erling Smørgrav #define PAM_OPT_REUSE_CCACHE "reuse_ccache" 9995748751SDoug Rabson #define PAM_OPT_NO_USER_CHECK "no_user_check" 100813847e4SCy Schubert #define PAM_OPT_ALLOW_KDC_SPOOF "allow_kdc_spoof" 10139384277SMark Murray 10226ec46c8SStanislav Sedov #define PAM_LOG_KRB5_ERR(ctx, rv, fmt, ...) \ 10326ec46c8SStanislav Sedov do { \ 10426ec46c8SStanislav Sedov const char *krb5msg = krb5_get_error_message(ctx, rv); \ 10526ec46c8SStanislav Sedov PAM_LOG(fmt ": %s", ##__VA_ARGS__, krb5msg); \ 10626ec46c8SStanislav Sedov krb5_free_error_message(ctx, krb5msg); \ 10726ec46c8SStanislav Sedov } while (0) 10826ec46c8SStanislav Sedov 10939384277SMark Murray /* 11039384277SMark Murray * authentication management 11139384277SMark Murray */ 11239384277SMark Murray PAM_EXTERN int 11324fe7ba0SDag-Erling Smørgrav pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, 114545aa471SDag-Erling Smørgrav int argc __unused, const char *argv[] __unused) 11539384277SMark Murray { 11639384277SMark Murray krb5_error_code krbret; 1179c2823baSDag-Erling Smørgrav krb5_context krbctx; 118813847e4SCy Schubert int debug; 119813847e4SCy Schubert const char *auth_service; 120813847e4SCy Schubert krb5_principal auth_princ; 121813847e4SCy Schubert char auth_phost[BUFSIZ]; 12239384277SMark Murray krb5_creds creds; 12339384277SMark Murray krb5_principal princ; 1247c2274dcSJacques Vidrine krb5_ccache ccache; 12526ec46c8SStanislav Sedov krb5_get_init_creds_opt *opts; 12639384277SMark Murray struct passwd *pwd; 12739384277SMark Murray int retval; 12864dbe1a7SDag-Erling Smørgrav const void *ccache_data; 1294911b12cSDag-Erling Smørgrav const char *user, *pass; 130af9b4074SDag-Erling Smørgrav const void *sourceuser, *service; 1317c2274dcSJacques Vidrine char *principal, *princ_name, *ccache_name, luser[32], *srvdup; 13239384277SMark Murray 13339384277SMark Murray retval = pam_get_user(pamh, &user, USER_PROMPT); 13439384277SMark Murray if (retval != PAM_SUCCESS) 13524fe7ba0SDag-Erling Smørgrav return (retval); 13639384277SMark Murray 13739384277SMark Murray PAM_LOG("Got user: %s", user); 13839384277SMark Murray 1394911b12cSDag-Erling Smørgrav retval = pam_get_item(pamh, PAM_RUSER, &sourceuser); 14039384277SMark Murray if (retval != PAM_SUCCESS) 14124fe7ba0SDag-Erling Smørgrav return (retval); 14239384277SMark Murray 1434911b12cSDag-Erling Smørgrav PAM_LOG("Got ruser: %s", (const char *)sourceuser); 14439384277SMark Murray 14539384277SMark Murray service = NULL; 1464911b12cSDag-Erling Smørgrav pam_get_item(pamh, PAM_SERVICE, &service); 14739384277SMark Murray if (service == NULL) 14839384277SMark Murray service = "unknown"; 14939384277SMark Murray 1504911b12cSDag-Erling Smørgrav PAM_LOG("Got service: %s", (const char *)service); 15139384277SMark Murray 152813847e4SCy Schubert if ((srvdup = strdup(service)) == NULL) { 153813847e4SCy Schubert retval = PAM_BUF_ERR; 154813847e4SCy Schubert goto cleanup6; 155813847e4SCy Schubert } 156813847e4SCy Schubert 1579c2823baSDag-Erling Smørgrav krbret = krb5_init_context(&krbctx); 15839384277SMark Murray if (krbret != 0) { 15939384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 160813847e4SCy Schubert retval = PAM_SERVICE_ERR; 161813847e4SCy Schubert goto cleanup5; 16239384277SMark Murray } 16339384277SMark Murray 16439384277SMark Murray PAM_LOG("Context initialised"); 16539384277SMark Murray 166813847e4SCy Schubert debug = openpam_get_option(pamh, PAM_OPT_DEBUG) ? 1 : 0; 1679c2823baSDag-Erling Smørgrav krbret = verify_krb_v5_tgt_begin(krbctx, srvdup, debug, 168813847e4SCy Schubert &auth_service, &auth_princ, auth_phost); 169813847e4SCy Schubert if (krbret != 0) { /* failed to find key */ 170813847e4SCy Schubert /* Keytab or service key does not exist */ 171813847e4SCy Schubert /* 172813847e4SCy Schubert * Give up now because we can't authenticate the KDC 173813847e4SCy Schubert * with a keytab, unless the administrator asked to 174813847e4SCy Schubert * have the traditional behaviour of being vulnerable 175813847e4SCy Schubert * to spoofed KDCs. 176813847e4SCy Schubert */ 177813847e4SCy Schubert if (!openpam_get_option(pamh, PAM_OPT_ALLOW_KDC_SPOOF)) { 178813847e4SCy Schubert retval = PAM_SERVICE_ERR; 179813847e4SCy Schubert goto cleanup4; 180813847e4SCy Schubert } 181813847e4SCy Schubert } 182813847e4SCy Schubert 1839c2823baSDag-Erling Smørgrav krbret = krb5_cc_register(krbctx, &krb5_mcc_ops, FALSE); 18439384277SMark Murray if (krbret != 0 && krbret != KRB5_CC_TYPE_EXISTS) { 18539384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 18639384277SMark Murray retval = PAM_SERVICE_ERR; 18739384277SMark Murray goto cleanup3; 18839384277SMark Murray } 18939384277SMark Murray 19039384277SMark Murray PAM_LOG("Done krb5_cc_register()"); 19139384277SMark Murray 19239384277SMark Murray /* Get principal name */ 193545aa471SDag-Erling Smørgrav if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) 1944911b12cSDag-Erling Smørgrav asprintf(&principal, "%s/%s", (const char *)sourceuser, user); 19539384277SMark Murray else 19639384277SMark Murray principal = strdup(user); 19739384277SMark Murray 19839384277SMark Murray PAM_LOG("Created principal: %s", principal); 19939384277SMark Murray 2009c2823baSDag-Erling Smørgrav krbret = krb5_parse_name(krbctx, principal, &princ); 20139384277SMark Murray free(principal); 20239384277SMark Murray if (krbret != 0) { 2039c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, "Error krb5_parse_name()"); 20439384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 20539384277SMark Murray retval = PAM_SERVICE_ERR; 20639384277SMark Murray goto cleanup3; 20739384277SMark Murray } 20839384277SMark Murray 20939384277SMark Murray PAM_LOG("Done krb5_parse_name()"); 21039384277SMark Murray 21139384277SMark Murray /* Now convert the principal name into something human readable */ 21239384277SMark Murray princ_name = NULL; 2139c2823baSDag-Erling Smørgrav krbret = krb5_unparse_name(krbctx, princ, &princ_name); 21439384277SMark Murray if (krbret != 0) { 2159c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 21626ec46c8SStanislav Sedov "Error krb5_unparse_name()"); 21739384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 21839384277SMark Murray retval = PAM_SERVICE_ERR; 21939384277SMark Murray goto cleanup2; 22039384277SMark Murray } 22139384277SMark Murray 22239384277SMark Murray PAM_LOG("Got principal: %s", princ_name); 22339384277SMark Murray 22439384277SMark Murray /* Get password */ 225111ccd25SDag-Erling Smørgrav retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, PASSWORD_PROMPT); 22639384277SMark Murray if (retval != PAM_SUCCESS) 22739384277SMark Murray goto cleanup2; 22839384277SMark Murray 22939384277SMark Murray PAM_LOG("Got password"); 23039384277SMark Murray 231551e75c7SMartin Matuska if (openpam_get_option(pamh, PAM_OPT_NO_USER_CHECK)) 232551e75c7SMartin Matuska PAM_LOG("Skipping local user check"); 233551e75c7SMartin Matuska else { 234551e75c7SMartin Matuska 23539384277SMark Murray /* Verify the local user exists (AFTER getting the password) */ 23639384277SMark Murray if (strchr(user, '@')) { 23739384277SMark Murray /* get a local account name for this principal */ 2389c2823baSDag-Erling Smørgrav krbret = krb5_aname_to_localname(krbctx, princ, 23939384277SMark Murray sizeof(luser), luser); 24039384277SMark Murray if (krbret != 0) { 24139384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 2429c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 24326ec46c8SStanislav Sedov "Error krb5_aname_to_localname()"); 24439384277SMark Murray retval = PAM_USER_UNKNOWN; 24539384277SMark Murray goto cleanup2; 24639384277SMark Murray } 24739384277SMark Murray 24839384277SMark Murray retval = pam_set_item(pamh, PAM_USER, luser); 24939384277SMark Murray if (retval != PAM_SUCCESS) 25039384277SMark Murray goto cleanup2; 25139384277SMark Murray 25239384277SMark Murray PAM_LOG("PAM_USER Redone"); 25339384277SMark Murray } 25439384277SMark Murray 25595748751SDoug Rabson if (!openpam_get_option(pamh, PAM_OPT_NO_USER_CHECK)) { 25639384277SMark Murray pwd = getpwnam(user); 25739384277SMark Murray if (pwd == NULL) { 25839384277SMark Murray retval = PAM_USER_UNKNOWN; 25939384277SMark Murray goto cleanup2; 26039384277SMark Murray } 26195748751SDoug Rabson } 26239384277SMark Murray 26339384277SMark Murray PAM_LOG("Done getpwnam()"); 264551e75c7SMartin Matuska } 26539384277SMark Murray 26626ec46c8SStanislav Sedov /* Initialize credentials request options. */ 2679c2823baSDag-Erling Smørgrav krbret = krb5_get_init_creds_opt_alloc(krbctx, &opts); 26826ec46c8SStanislav Sedov if (krbret != 0) { 2699c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 27026ec46c8SStanislav Sedov "Error krb5_get_init_creds_opt_alloc()"); 27126ec46c8SStanislav Sedov PAM_VERBOSE_ERROR("Kerberos 5 error"); 27226ec46c8SStanislav Sedov retval = PAM_SERVICE_ERR; 27326ec46c8SStanislav Sedov goto cleanup2; 27426ec46c8SStanislav Sedov } 2759c2823baSDag-Erling Smørgrav krb5_get_init_creds_opt_set_default_flags(krbctx, 276886c5814SDag-Erling Smørgrav service, NULL, opts); 27726ec46c8SStanislav Sedov 27826ec46c8SStanislav Sedov if (openpam_get_option(pamh, PAM_OPT_FORWARDABLE)) 27926ec46c8SStanislav Sedov krb5_get_init_creds_opt_set_forwardable(opts, 1); 28026ec46c8SStanislav Sedov 28126ec46c8SStanislav Sedov PAM_LOG("Credential options initialised"); 28226ec46c8SStanislav Sedov 28339384277SMark Murray /* Get a TGT */ 28439384277SMark Murray memset(&creds, 0, sizeof(krb5_creds)); 2859c2823baSDag-Erling Smørgrav krbret = krb5_get_init_creds_password(krbctx, &creds, princ, 28626ec46c8SStanislav Sedov pass, NULL, pamh, 0, NULL, opts); 2879c2823baSDag-Erling Smørgrav krb5_get_init_creds_opt_free(krbctx, opts); 28839384277SMark Murray if (krbret != 0) { 28939384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 2909c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 29126ec46c8SStanislav Sedov "Error krb5_get_init_creds_password()"); 29239384277SMark Murray retval = PAM_AUTH_ERR; 29339384277SMark Murray goto cleanup2; 29439384277SMark Murray } 29539384277SMark Murray 29639384277SMark Murray PAM_LOG("Got TGT"); 29739384277SMark Murray 2987c2274dcSJacques Vidrine /* Generate a temporary cache */ 2999c2823baSDag-Erling Smørgrav krbret = krb5_cc_new_unique(krbctx, krb5_cc_type_memory, NULL, &ccache); 30039384277SMark Murray if (krbret != 0) { 30139384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 3029c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 30326ec46c8SStanislav Sedov "Error krb5_cc_new_unique()"); 30439384277SMark Murray retval = PAM_SERVICE_ERR; 30539384277SMark Murray goto cleanup; 30639384277SMark Murray } 3079c2823baSDag-Erling Smørgrav krbret = krb5_cc_initialize(krbctx, ccache, princ); 30839384277SMark Murray if (krbret != 0) { 30939384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 3109c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 31126ec46c8SStanislav Sedov "Error krb5_cc_initialize()"); 31239384277SMark Murray retval = PAM_SERVICE_ERR; 31339384277SMark Murray goto cleanup; 31439384277SMark Murray } 3159c2823baSDag-Erling Smørgrav krbret = krb5_cc_store_cred(krbctx, ccache, &creds); 31639384277SMark Murray if (krbret != 0) { 31739384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 3189c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 31926ec46c8SStanislav Sedov "Error krb5_cc_store_cred()"); 3209c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache); 32139384277SMark Murray retval = PAM_SERVICE_ERR; 32239384277SMark Murray goto cleanup; 32339384277SMark Murray } 32439384277SMark Murray 32539384277SMark Murray PAM_LOG("Credentials stashed"); 32639384277SMark Murray 32739384277SMark Murray /* Verify them */ 3289c2823baSDag-Erling Smørgrav krbret = verify_krb_v5_tgt(krbctx, ccache, srvdup, 329813847e4SCy Schubert debug, 330813847e4SCy Schubert auth_service, auth_princ, auth_phost); 331111ccd25SDag-Erling Smørgrav free(srvdup); 332813847e4SCy Schubert srvdup = NULL; 333111ccd25SDag-Erling Smørgrav if (krbret == -1) { 33439384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 3359c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache); 33639384277SMark Murray retval = PAM_AUTH_ERR; 33739384277SMark Murray goto cleanup; 33839384277SMark Murray } 33939384277SMark Murray 34039384277SMark Murray PAM_LOG("Credentials stash verified"); 34139384277SMark Murray 342af9b4074SDag-Erling Smørgrav retval = pam_get_data(pamh, "ccache", &ccache_data); 34339384277SMark Murray if (retval == PAM_SUCCESS) { 3449c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache); 34539384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 34639384277SMark Murray retval = PAM_AUTH_ERR; 34739384277SMark Murray goto cleanup; 34839384277SMark Murray } 34939384277SMark Murray 35039384277SMark Murray PAM_LOG("Credentials stash not pre-existing"); 35139384277SMark Murray 3529c2823baSDag-Erling Smørgrav asprintf(&ccache_name, "%s:%s", krb5_cc_get_type(krbctx, 3539c2823baSDag-Erling Smørgrav ccache), krb5_cc_get_name(krbctx, ccache)); 3547c2274dcSJacques Vidrine if (ccache_name == NULL) { 3557c2274dcSJacques Vidrine PAM_VERBOSE_ERROR("Kerberos 5 error"); 3567c2274dcSJacques Vidrine retval = PAM_BUF_ERR; 3577c2274dcSJacques Vidrine goto cleanup; 3587c2274dcSJacques Vidrine } 3597c2274dcSJacques Vidrine retval = pam_set_data(pamh, "ccache", ccache_name, cleanup_cache); 36039384277SMark Murray if (retval != 0) { 3619c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache); 36239384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 error"); 36339384277SMark Murray retval = PAM_SERVICE_ERR; 36439384277SMark Murray goto cleanup; 36539384277SMark Murray } 36639384277SMark Murray 36739384277SMark Murray PAM_LOG("Credentials stash saved"); 36839384277SMark Murray 36939384277SMark Murray cleanup: 3709c2823baSDag-Erling Smørgrav krb5_free_cred_contents(krbctx, &creds); 37139384277SMark Murray PAM_LOG("Done cleanup"); 37239384277SMark Murray cleanup2: 3739c2823baSDag-Erling Smørgrav krb5_free_principal(krbctx, princ); 37439384277SMark Murray if (princ_name) 37539384277SMark Murray free(princ_name); 3762251b307SDimitry Andric PAM_LOG("Done cleanup2"); 37739384277SMark Murray 3782251b307SDimitry Andric cleanup3: 3799c2823baSDag-Erling Smørgrav krb5_free_context(krbctx); 38039384277SMark Murray 38139384277SMark Murray PAM_LOG("Done cleanup3"); 38239384277SMark Murray 383813847e4SCy Schubert cleanup4: 3849c2823baSDag-Erling Smørgrav verify_krb_v5_tgt_cleanup(krbctx, debug, 385813847e4SCy Schubert auth_service, auth_princ, auth_phost); 386813847e4SCy Schubert PAM_LOG("Done cleanup4"); 387813847e4SCy Schubert 388813847e4SCy Schubert cleanup5: 389813847e4SCy Schubert if (srvdup != NULL) 390813847e4SCy Schubert free(srvdup); 391813847e4SCy Schubert PAM_LOG("Done cleanup5"); 392813847e4SCy Schubert 393813847e4SCy Schubert cleanup6: 39439384277SMark Murray if (retval != PAM_SUCCESS) 39539384277SMark Murray PAM_VERBOSE_ERROR("Kerberos 5 refuses you"); 396813847e4SCy Schubert PAM_LOG("Done cleanup6"); 39739384277SMark Murray 39824fe7ba0SDag-Erling Smørgrav return (retval); 39939384277SMark Murray } 40039384277SMark Murray 40139384277SMark Murray PAM_EXTERN int 40224fe7ba0SDag-Erling Smørgrav pam_sm_setcred(pam_handle_t *pamh, int flags, 403545aa471SDag-Erling Smørgrav int argc __unused, const char *argv[] __unused) 40439384277SMark Murray { 4052672e717SKen Smith #ifdef _FREEFALL_CONFIG 4062672e717SKen Smith return (PAM_SUCCESS); 4072672e717SKen Smith #else 40839384277SMark Murray 40939384277SMark Murray krb5_error_code krbret; 4109c2823baSDag-Erling Smørgrav krb5_context krbctx; 41139384277SMark Murray krb5_principal princ; 41239384277SMark Murray krb5_creds creds; 41339384277SMark Murray krb5_ccache ccache_temp, ccache_perm; 41439384277SMark Murray krb5_cc_cursor cursor; 41539384277SMark Murray struct passwd *pwd = NULL; 41639384277SMark Murray int retval; 4174911b12cSDag-Erling Smørgrav const char *cache_name, *q; 418af9b4074SDag-Erling Smørgrav const void *user; 41964dbe1a7SDag-Erling Smørgrav const void *cache_data; 420545aa471SDag-Erling Smørgrav char *cache_name_buf = NULL, *p; 42139384277SMark Murray 42239384277SMark Murray uid_t euid; 42339384277SMark Murray gid_t egid; 42439384277SMark Murray 42539384277SMark Murray if (flags & PAM_DELETE_CRED) 42624fe7ba0SDag-Erling Smørgrav return (PAM_SUCCESS); 42739384277SMark Murray 42839384277SMark Murray if (flags & PAM_REFRESH_CRED) 42924fe7ba0SDag-Erling Smørgrav return (PAM_SUCCESS); 43039384277SMark Murray 43139384277SMark Murray if (flags & PAM_REINITIALIZE_CRED) 43224fe7ba0SDag-Erling Smørgrav return (PAM_SUCCESS); 43339384277SMark Murray 43439384277SMark Murray if (!(flags & PAM_ESTABLISH_CRED)) 43524fe7ba0SDag-Erling Smørgrav return (PAM_SERVICE_ERR); 43639384277SMark Murray 437ed41980cSRobert Watson /* If a persistent cache isn't desired, stop now. */ 438551e75c7SMartin Matuska if (openpam_get_option(pamh, PAM_OPT_NO_CCACHE) || 439551e75c7SMartin Matuska openpam_get_option(pamh, PAM_OPT_NO_USER_CHECK)) 440ed41980cSRobert Watson return (PAM_SUCCESS); 441ed41980cSRobert Watson 44239384277SMark Murray PAM_LOG("Establishing credentials"); 44339384277SMark Murray 44439384277SMark Murray /* Get username */ 4454911b12cSDag-Erling Smørgrav retval = pam_get_item(pamh, PAM_USER, &user); 44639384277SMark Murray if (retval != PAM_SUCCESS) 44724fe7ba0SDag-Erling Smørgrav return (retval); 44839384277SMark Murray 4494911b12cSDag-Erling Smørgrav PAM_LOG("Got user: %s", (const char *)user); 45039384277SMark Murray 4519c2823baSDag-Erling Smørgrav krbret = krb5_init_context(&krbctx); 45239384277SMark Murray if (krbret != 0) { 45388c8bcceSJacques Vidrine PAM_LOG("Error krb5_init_context() failed"); 45424fe7ba0SDag-Erling Smørgrav return (PAM_SERVICE_ERR); 45539384277SMark Murray } 45639384277SMark Murray 45739384277SMark Murray PAM_LOG("Context initialised"); 45839384277SMark Murray 45939384277SMark Murray euid = geteuid(); /* Usually 0 */ 46039384277SMark Murray egid = getegid(); 46139384277SMark Murray 46239384277SMark Murray PAM_LOG("Got euid, egid: %d %d", euid, egid); 46339384277SMark Murray 4647c2274dcSJacques Vidrine /* Retrieve the temporary cache */ 4654911b12cSDag-Erling Smørgrav retval = pam_get_data(pamh, "ccache", &cache_data); 4668f857e88SJacques Vidrine if (retval != PAM_SUCCESS) { 4678f857e88SJacques Vidrine retval = PAM_CRED_UNAVAIL; 46839384277SMark Murray goto cleanup3; 4698f857e88SJacques Vidrine } 4709c2823baSDag-Erling Smørgrav krbret = krb5_cc_resolve(krbctx, cache_data, &ccache_temp); 4717c2274dcSJacques Vidrine if (krbret != 0) { 4729c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 47326ec46c8SStanislav Sedov "Error krb5_cc_resolve(\"%s\")", (const char *)cache_data); 4748f857e88SJacques Vidrine retval = PAM_SERVICE_ERR; 4757c2274dcSJacques Vidrine goto cleanup3; 4767c2274dcSJacques Vidrine } 47739384277SMark Murray 47839384277SMark Murray /* Get the uid. This should exist. */ 47939384277SMark Murray pwd = getpwnam(user); 48039384277SMark Murray if (pwd == NULL) { 48139384277SMark Murray retval = PAM_USER_UNKNOWN; 48239384277SMark Murray goto cleanup3; 48339384277SMark Murray } 48439384277SMark Murray 48539384277SMark Murray PAM_LOG("Done getpwnam()"); 48639384277SMark Murray 48739384277SMark Murray /* Avoid following a symlink as root */ 48839384277SMark Murray if (setegid(pwd->pw_gid)) { 48939384277SMark Murray retval = PAM_SERVICE_ERR; 49039384277SMark Murray goto cleanup3; 49139384277SMark Murray } 49239384277SMark Murray if (seteuid(pwd->pw_uid)) { 49339384277SMark Murray retval = PAM_SERVICE_ERR; 49439384277SMark Murray goto cleanup3; 49539384277SMark Murray } 49639384277SMark Murray 49739384277SMark Murray PAM_LOG("Done setegid() & seteuid()"); 49839384277SMark Murray 49939384277SMark Murray /* Get the cache name */ 500545aa471SDag-Erling Smørgrav cache_name = openpam_get_option(pamh, PAM_OPT_CCACHE); 501545aa471SDag-Erling Smørgrav if (cache_name == NULL) { 502545aa471SDag-Erling Smørgrav asprintf(&cache_name_buf, "FILE:/tmp/krb5cc_%d", pwd->pw_uid); 503545aa471SDag-Erling Smørgrav cache_name = cache_name_buf; 504545aa471SDag-Erling Smørgrav } 50539384277SMark Murray 50639384277SMark Murray p = calloc(PATH_MAX + 16, sizeof(char)); 50739384277SMark Murray q = cache_name; 50839384277SMark Murray 50939384277SMark Murray if (p == NULL) { 51039384277SMark Murray PAM_LOG("Error malloc(): failure"); 51139384277SMark Murray retval = PAM_BUF_ERR; 51239384277SMark Murray goto cleanup3; 51339384277SMark Murray } 51439384277SMark Murray cache_name = p; 51539384277SMark Murray 51639384277SMark Murray /* convert %u and %p */ 51739384277SMark Murray while (*q) { 51839384277SMark Murray if (*q == '%') { 51939384277SMark Murray q++; 52039384277SMark Murray if (*q == 'u') { 52139384277SMark Murray sprintf(p, "%d", pwd->pw_uid); 52239384277SMark Murray p += strlen(p); 52339384277SMark Murray } 52439384277SMark Murray else if (*q == 'p') { 52539384277SMark Murray sprintf(p, "%d", getpid()); 52639384277SMark Murray p += strlen(p); 52739384277SMark Murray } 52839384277SMark Murray else { 52939384277SMark Murray /* Not a special token */ 53039384277SMark Murray *p++ = '%'; 53139384277SMark Murray q--; 53239384277SMark Murray } 53339384277SMark Murray q++; 53439384277SMark Murray } 53539384277SMark Murray else { 53639384277SMark Murray *p++ = *q++; 53739384277SMark Murray } 53839384277SMark Murray } 53939384277SMark Murray 54039384277SMark Murray PAM_LOG("Got cache_name: %s", cache_name); 54139384277SMark Murray 54239384277SMark Murray /* Initialize the new ccache */ 5439c2823baSDag-Erling Smørgrav krbret = krb5_cc_get_principal(krbctx, ccache_temp, &princ); 54439384277SMark Murray if (krbret != 0) { 5459c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 54626ec46c8SStanislav Sedov "Error krb5_cc_get_principal()"); 54739384277SMark Murray retval = PAM_SERVICE_ERR; 54839384277SMark Murray goto cleanup3; 54939384277SMark Murray } 5509c2823baSDag-Erling Smørgrav krbret = krb5_cc_resolve(krbctx, cache_name, &ccache_perm); 55139384277SMark Murray if (krbret != 0) { 5529c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, "Error krb5_cc_resolve()"); 55339384277SMark Murray retval = PAM_SERVICE_ERR; 55439384277SMark Murray goto cleanup2; 55539384277SMark Murray } 5569c2823baSDag-Erling Smørgrav krbret = krb5_cc_initialize(krbctx, ccache_perm, princ); 55739384277SMark Murray if (krbret != 0) { 5589c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 55926ec46c8SStanislav Sedov "Error krb5_cc_initialize()"); 56039384277SMark Murray retval = PAM_SERVICE_ERR; 56139384277SMark Murray goto cleanup2; 56239384277SMark Murray } 56339384277SMark Murray 56439384277SMark Murray PAM_LOG("Cache initialised"); 56539384277SMark Murray 56639384277SMark Murray /* Prepare for iteration over creds */ 5679c2823baSDag-Erling Smørgrav krbret = krb5_cc_start_seq_get(krbctx, ccache_temp, &cursor); 56839384277SMark Murray if (krbret != 0) { 5699c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 57026ec46c8SStanislav Sedov "Error krb5_cc_start_seq_get()"); 5719c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache_perm); 57239384277SMark Murray retval = PAM_SERVICE_ERR; 57339384277SMark Murray goto cleanup2; 57439384277SMark Murray } 57539384277SMark Murray 57639384277SMark Murray PAM_LOG("Prepared for iteration"); 57739384277SMark Murray 57839384277SMark Murray /* Copy the creds (should be two of them) */ 5799c2823baSDag-Erling Smørgrav while (krb5_cc_next_cred(krbctx, ccache_temp, &cursor, &creds) == 0) { 5809c2823baSDag-Erling Smørgrav krbret = krb5_cc_store_cred(krbctx, ccache_perm, &creds); 58139384277SMark Murray if (krbret != 0) { 5829c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 58326ec46c8SStanislav Sedov "Error krb5_cc_store_cred()"); 5849c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache_perm); 5859c2823baSDag-Erling Smørgrav krb5_free_cred_contents(krbctx, &creds); 58639384277SMark Murray retval = PAM_SERVICE_ERR; 58739384277SMark Murray goto cleanup2; 58839384277SMark Murray } 5899c2823baSDag-Erling Smørgrav krb5_free_cred_contents(krbctx, &creds); 59039384277SMark Murray PAM_LOG("Iteration"); 59139384277SMark Murray } 5929c2823baSDag-Erling Smørgrav krb5_cc_end_seq_get(krbctx, ccache_temp, &cursor); 59339384277SMark Murray 59439384277SMark Murray PAM_LOG("Done iterating"); 59539384277SMark Murray 59639384277SMark Murray if (strstr(cache_name, "FILE:") == cache_name) { 59739384277SMark Murray if (chown(&cache_name[5], pwd->pw_uid, pwd->pw_gid) == -1) { 59839384277SMark Murray PAM_LOG("Error chown(): %s", strerror(errno)); 5999c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache_perm); 60039384277SMark Murray retval = PAM_SERVICE_ERR; 60139384277SMark Murray goto cleanup2; 60239384277SMark Murray } 60339384277SMark Murray PAM_LOG("Done chown()"); 60439384277SMark Murray 60539384277SMark Murray if (chmod(&cache_name[5], (S_IRUSR | S_IWUSR)) == -1) { 60639384277SMark Murray PAM_LOG("Error chmod(): %s", strerror(errno)); 6079c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache_perm); 60839384277SMark Murray retval = PAM_SERVICE_ERR; 60939384277SMark Murray goto cleanup2; 61039384277SMark Murray } 61139384277SMark Murray PAM_LOG("Done chmod()"); 61239384277SMark Murray } 61339384277SMark Murray 6149c2823baSDag-Erling Smørgrav krb5_cc_close(krbctx, ccache_perm); 61539384277SMark Murray 61639384277SMark Murray PAM_LOG("Cache closed"); 61739384277SMark Murray 618545aa471SDag-Erling Smørgrav retval = pam_setenv(pamh, "KRB5CCNAME", cache_name, 1); 619545aa471SDag-Erling Smørgrav if (retval != PAM_SUCCESS) { 620545aa471SDag-Erling Smørgrav PAM_LOG("Error pam_setenv(): %s", pam_strerror(pamh, retval)); 6219c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache_perm); 62239384277SMark Murray retval = PAM_SERVICE_ERR; 62339384277SMark Murray goto cleanup2; 62439384277SMark Murray } 62539384277SMark Murray 62639384277SMark Murray PAM_LOG("Environment done: KRB5CCNAME=%s", cache_name); 62739384277SMark Murray 62839384277SMark Murray cleanup2: 6299c2823baSDag-Erling Smørgrav krb5_free_principal(krbctx, princ); 63039384277SMark Murray PAM_LOG("Done cleanup2"); 63139384277SMark Murray cleanup3: 6329c2823baSDag-Erling Smørgrav krb5_free_context(krbctx); 63339384277SMark Murray PAM_LOG("Done cleanup3"); 63439384277SMark Murray 63539384277SMark Murray seteuid(euid); 63639384277SMark Murray setegid(egid); 63739384277SMark Murray 63839384277SMark Murray PAM_LOG("Done seteuid() & setegid()"); 63939384277SMark Murray 640545aa471SDag-Erling Smørgrav if (cache_name_buf != NULL) 641545aa471SDag-Erling Smørgrav free(cache_name_buf); 642545aa471SDag-Erling Smørgrav 64324fe7ba0SDag-Erling Smørgrav return (retval); 6442672e717SKen Smith #endif 64539384277SMark Murray } 64639384277SMark Murray 64739384277SMark Murray /* 64839384277SMark Murray * account management 64939384277SMark Murray */ 65039384277SMark Murray PAM_EXTERN int 65124fe7ba0SDag-Erling Smørgrav pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused, 652545aa471SDag-Erling Smørgrav int argc __unused, const char *argv[] __unused) 65339384277SMark Murray { 65439384277SMark Murray krb5_error_code krbret; 6559c2823baSDag-Erling Smørgrav krb5_context krbctx; 65639384277SMark Murray krb5_ccache ccache; 65739384277SMark Murray krb5_principal princ; 65839384277SMark Murray int retval; 659af9b4074SDag-Erling Smørgrav const void *user; 66064dbe1a7SDag-Erling Smørgrav const void *ccache_name; 66139384277SMark Murray 6624911b12cSDag-Erling Smørgrav retval = pam_get_item(pamh, PAM_USER, &user); 66339384277SMark Murray if (retval != PAM_SUCCESS) 66424fe7ba0SDag-Erling Smørgrav return (retval); 66539384277SMark Murray 6664911b12cSDag-Erling Smørgrav PAM_LOG("Got user: %s", (const char *)user); 66739384277SMark Murray 6684911b12cSDag-Erling Smørgrav retval = pam_get_data(pamh, "ccache", &ccache_name); 6698dad14b1SDag-Erling Smørgrav if (retval != PAM_SUCCESS) 6708dad14b1SDag-Erling Smørgrav return (PAM_SUCCESS); 6718dad14b1SDag-Erling Smørgrav 6728dad14b1SDag-Erling Smørgrav PAM_LOG("Got credentials"); 6738dad14b1SDag-Erling Smørgrav 6749c2823baSDag-Erling Smørgrav krbret = krb5_init_context(&krbctx); 67539384277SMark Murray if (krbret != 0) { 67688c8bcceSJacques Vidrine PAM_LOG("Error krb5_init_context() failed"); 67724fe7ba0SDag-Erling Smørgrav return (PAM_PERM_DENIED); 67839384277SMark Murray } 67939384277SMark Murray 68039384277SMark Murray PAM_LOG("Context initialised"); 68139384277SMark Murray 6829c2823baSDag-Erling Smørgrav krbret = krb5_cc_resolve(krbctx, (const char *)ccache_name, &ccache); 6837c2274dcSJacques Vidrine if (krbret != 0) { 6849c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 68526ec46c8SStanislav Sedov "Error krb5_cc_resolve(\"%s\")", (const char *)ccache_name); 6869c2823baSDag-Erling Smørgrav krb5_free_context(krbctx); 6877c2274dcSJacques Vidrine return (PAM_PERM_DENIED); 6887c2274dcSJacques Vidrine } 6897c2274dcSJacques Vidrine 6904911b12cSDag-Erling Smørgrav PAM_LOG("Got ccache %s", (const char *)ccache_name); 6917c2274dcSJacques Vidrine 6927c2274dcSJacques Vidrine 6939c2823baSDag-Erling Smørgrav krbret = krb5_cc_get_principal(krbctx, ccache, &princ); 69439384277SMark Murray if (krbret != 0) { 6959c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 69626ec46c8SStanislav Sedov "Error krb5_cc_get_principal()"); 697db702c59SEitan Adler retval = PAM_PERM_DENIED; 69839384277SMark Murray goto cleanup; 69939384277SMark Murray } 70039384277SMark Murray 70139384277SMark Murray PAM_LOG("Got principal"); 70239384277SMark Murray 7039c2823baSDag-Erling Smørgrav if (krb5_kuserok(krbctx, princ, (const char *)user)) 70439384277SMark Murray retval = PAM_SUCCESS; 70539384277SMark Murray else 70639384277SMark Murray retval = PAM_PERM_DENIED; 7079c2823baSDag-Erling Smørgrav krb5_free_principal(krbctx, princ); 70839384277SMark Murray 70939384277SMark Murray PAM_LOG("Done kuserok()"); 71039384277SMark Murray 71139384277SMark Murray cleanup: 7129c2823baSDag-Erling Smørgrav krb5_free_context(krbctx); 71339384277SMark Murray PAM_LOG("Done cleanup"); 71439384277SMark Murray 71524fe7ba0SDag-Erling Smørgrav return (retval); 71639384277SMark Murray 71739384277SMark Murray } 71839384277SMark Murray 71939384277SMark Murray /* 72039384277SMark Murray * password management 72139384277SMark Murray */ 72239384277SMark Murray PAM_EXTERN int 72324fe7ba0SDag-Erling Smørgrav pam_sm_chauthtok(pam_handle_t *pamh, int flags, 724545aa471SDag-Erling Smørgrav int argc __unused, const char *argv[] __unused) 72539384277SMark Murray { 72639384277SMark Murray krb5_error_code krbret; 7279c2823baSDag-Erling Smørgrav krb5_context krbctx; 72839384277SMark Murray krb5_creds creds; 72939384277SMark Murray krb5_principal princ; 73026ec46c8SStanislav Sedov krb5_get_init_creds_opt *opts; 73139384277SMark Murray krb5_data result_code_string, result_string; 73239384277SMark Murray int result_code, retval; 7334911b12cSDag-Erling Smørgrav const char *pass; 7344911b12cSDag-Erling Smørgrav const void *user; 735111ccd25SDag-Erling Smørgrav char *princ_name, *passdup; 73639384277SMark Murray 73739384277SMark Murray if (!(flags & PAM_UPDATE_AUTHTOK)) 73824fe7ba0SDag-Erling Smørgrav return (PAM_AUTHTOK_ERR); 73939384277SMark Murray 7404911b12cSDag-Erling Smørgrav retval = pam_get_item(pamh, PAM_USER, &user); 74139384277SMark Murray if (retval != PAM_SUCCESS) 74224fe7ba0SDag-Erling Smørgrav return (retval); 74339384277SMark Murray 7444911b12cSDag-Erling Smørgrav PAM_LOG("Got user: %s", (const char *)user); 74539384277SMark Murray 7469c2823baSDag-Erling Smørgrav krbret = krb5_init_context(&krbctx); 74739384277SMark Murray if (krbret != 0) { 74888c8bcceSJacques Vidrine PAM_LOG("Error krb5_init_context() failed"); 74924fe7ba0SDag-Erling Smørgrav return (PAM_SERVICE_ERR); 75039384277SMark Murray } 75139384277SMark Murray 75239384277SMark Murray PAM_LOG("Context initialised"); 75339384277SMark Murray 75439384277SMark Murray /* Get principal name */ 7559c2823baSDag-Erling Smørgrav krbret = krb5_parse_name(krbctx, (const char *)user, &princ); 75639384277SMark Murray if (krbret != 0) { 7579c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 75826ec46c8SStanislav Sedov "Error krb5_parse_name()"); 75939384277SMark Murray retval = PAM_USER_UNKNOWN; 76039384277SMark Murray goto cleanup3; 76139384277SMark Murray } 76239384277SMark Murray 76339384277SMark Murray /* Now convert the principal name into something human readable */ 76439384277SMark Murray princ_name = NULL; 7659c2823baSDag-Erling Smørgrav krbret = krb5_unparse_name(krbctx, princ, &princ_name); 76639384277SMark Murray if (krbret != 0) { 7679c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 76826ec46c8SStanislav Sedov "Error krb5_unparse_name()"); 76939384277SMark Murray retval = PAM_SERVICE_ERR; 77039384277SMark Murray goto cleanup2; 77139384277SMark Murray } 77239384277SMark Murray 77339384277SMark Murray PAM_LOG("Got principal: %s", princ_name); 77439384277SMark Murray 77539384277SMark Murray /* Get password */ 776111ccd25SDag-Erling Smørgrav retval = pam_get_authtok(pamh, PAM_OLDAUTHTOK, &pass, PASSWORD_PROMPT); 77739384277SMark Murray if (retval != PAM_SUCCESS) 77839384277SMark Murray goto cleanup2; 77939384277SMark Murray 78039384277SMark Murray PAM_LOG("Got password"); 78139384277SMark Murray 78226ec46c8SStanislav Sedov /* Initialize credentials request options. */ 7839c2823baSDag-Erling Smørgrav krbret = krb5_get_init_creds_opt_alloc(krbctx, &opts); 78426ec46c8SStanislav Sedov if (krbret != 0) { 7859c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 78626ec46c8SStanislav Sedov "Error krb5_get_init_creds_opt_alloc()"); 78726ec46c8SStanislav Sedov PAM_VERBOSE_ERROR("Kerberos 5 error"); 78826ec46c8SStanislav Sedov retval = PAM_SERVICE_ERR; 78926ec46c8SStanislav Sedov goto cleanup2; 79026ec46c8SStanislav Sedov } 79126ec46c8SStanislav Sedov 79226ec46c8SStanislav Sedov PAM_LOG("Credentials options initialised"); 79326ec46c8SStanislav Sedov 79439384277SMark Murray memset(&creds, 0, sizeof(krb5_creds)); 7959c2823baSDag-Erling Smørgrav krbret = krb5_get_init_creds_password(krbctx, &creds, princ, 79626ec46c8SStanislav Sedov pass, NULL, pamh, 0, "kadmin/changepw", opts); 7979c2823baSDag-Erling Smørgrav krb5_get_init_creds_opt_free(krbctx, opts); 79839384277SMark Murray if (krbret != 0) { 7999c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 80026ec46c8SStanislav Sedov "Error krb5_get_init_creds_password()"); 80139384277SMark Murray retval = PAM_AUTH_ERR; 80239384277SMark Murray goto cleanup2; 80339384277SMark Murray } 80439384277SMark Murray 80539384277SMark Murray PAM_LOG("Credentials established"); 80639384277SMark Murray 80739384277SMark Murray /* Now get the new password */ 808111ccd25SDag-Erling Smørgrav for (;;) { 809111ccd25SDag-Erling Smørgrav retval = pam_get_authtok(pamh, 810111ccd25SDag-Erling Smørgrav PAM_AUTHTOK, &pass, NEW_PASSWORD_PROMPT); 811111ccd25SDag-Erling Smørgrav if (retval != PAM_TRY_AGAIN) 812111ccd25SDag-Erling Smørgrav break; 813111ccd25SDag-Erling Smørgrav pam_error(pamh, "Mismatch; try again, EOF to quit."); 81439384277SMark Murray } 815111ccd25SDag-Erling Smørgrav if (retval != PAM_SUCCESS) 816111ccd25SDag-Erling Smørgrav goto cleanup; 81739384277SMark Murray 818111ccd25SDag-Erling Smørgrav PAM_LOG("Got new password"); 81939384277SMark Murray 82039384277SMark Murray /* Change it */ 821111ccd25SDag-Erling Smørgrav if ((passdup = strdup(pass)) == NULL) { 822111ccd25SDag-Erling Smørgrav retval = PAM_BUF_ERR; 823111ccd25SDag-Erling Smørgrav goto cleanup; 824111ccd25SDag-Erling Smørgrav } 8259c2823baSDag-Erling Smørgrav krbret = krb5_set_password(krbctx, &creds, passdup, NULL, 82639384277SMark Murray &result_code, &result_code_string, &result_string); 827111ccd25SDag-Erling Smørgrav free(passdup); 82839384277SMark Murray if (krbret != 0) { 8299c2823baSDag-Erling Smørgrav PAM_LOG_KRB5_ERR(krbctx, krbret, 83026ec46c8SStanislav Sedov "Error krb5_change_password()"); 83139384277SMark Murray retval = PAM_AUTHTOK_ERR; 83239384277SMark Murray goto cleanup; 83339384277SMark Murray } 83439384277SMark Murray if (result_code) { 83539384277SMark Murray PAM_LOG("Error krb5_change_password(): (result_code)"); 83639384277SMark Murray retval = PAM_AUTHTOK_ERR; 83739384277SMark Murray goto cleanup; 83839384277SMark Murray } 83939384277SMark Murray 84039384277SMark Murray PAM_LOG("Password changed"); 84139384277SMark Murray 84239384277SMark Murray if (result_string.data) 84339384277SMark Murray free(result_string.data); 84439384277SMark Murray if (result_code_string.data) 84539384277SMark Murray free(result_code_string.data); 84639384277SMark Murray 84739384277SMark Murray cleanup: 8489c2823baSDag-Erling Smørgrav krb5_free_cred_contents(krbctx, &creds); 84939384277SMark Murray PAM_LOG("Done cleanup"); 85039384277SMark Murray cleanup2: 8519c2823baSDag-Erling Smørgrav krb5_free_principal(krbctx, princ); 85239384277SMark Murray if (princ_name) 85339384277SMark Murray free(princ_name); 8542251b307SDimitry Andric PAM_LOG("Done cleanup2"); 85539384277SMark Murray 8562251b307SDimitry Andric cleanup3: 8579c2823baSDag-Erling Smørgrav krb5_free_context(krbctx); 85839384277SMark Murray 85939384277SMark Murray PAM_LOG("Done cleanup3"); 86039384277SMark Murray 86124fe7ba0SDag-Erling Smørgrav return (retval); 86239384277SMark Murray } 86339384277SMark Murray 86439384277SMark Murray PAM_MODULE_ENTRY("pam_krb5"); 86539384277SMark Murray 86639384277SMark Murray /* 86739384277SMark Murray * This routine with some modification is from the MIT V5B6 appl/bsd/login.c 86839384277SMark Murray * Modified by Sam Hartman <hartmans@mit.edu> to support PAM services 86939384277SMark Murray * for Debian. 87039384277SMark Murray * 87139384277SMark Murray * Verify the Kerberos ticket-granting ticket just retrieved for the 87239384277SMark Murray * user. If the Kerberos server doesn't respond, assume the user is 87339384277SMark Murray * trying to fake us out (since we DID just get a TGT from what is 87439384277SMark Murray * supposedly our KDC). If the host/<host> service is unknown (i.e., 87539384277SMark Murray * the local keytab doesn't have it), and we cannot find another 87639384277SMark Murray * service we do have, let her in. 87739384277SMark Murray * 87839384277SMark Murray * Returns 1 for confirmation, -1 for failure, 0 for uncertainty. 87939384277SMark Murray */ 880b4240e6cSMark Murray /* ARGSUSED */ 88139384277SMark Murray static int 882813847e4SCy Schubert verify_krb_v5_tgt_begin(krb5_context context, char *pam_service, int debug, 883813847e4SCy Schubert const char **servicep, krb5_principal *princp __unused, char phost[static BUFSIZ]) 88439384277SMark Murray { 88539384277SMark Murray krb5_error_code retval; 88639384277SMark Murray krb5_principal princ; 88739384277SMark Murray krb5_keyblock *keyblock; 888c2065008SMark Murray const char *services[3], **service; 88939384277SMark Murray 890813847e4SCy Schubert *servicep = NULL; 891813847e4SCy Schubert 892813847e4SCy Schubert if (debug) 893813847e4SCy Schubert openlog("pam_krb5", LOG_PID, LOG_AUTHPRIV); 89439384277SMark Murray 89539384277SMark Murray /* If possible we want to try and verify the ticket we have 89639384277SMark Murray * received against a keytab. We will try multiple service 89739384277SMark Murray * principals, including at least the host principal and the PAM 89839384277SMark Murray * service principal. The host principal is preferred because access 89939384277SMark Murray * to that key is generally sufficient to compromise root, while the 90039384277SMark Murray * service key for this PAM service may be less carefully guarded. 90139384277SMark Murray * It is important to check the keytab first before the KDC so we do 90239384277SMark Murray * not get spoofed by a fake KDC. 90339384277SMark Murray */ 90439384277SMark Murray services[0] = "host"; 90539384277SMark Murray services[1] = pam_service; 90639384277SMark Murray services[2] = NULL; 907d18146c2SPedro F. Giffuni keyblock = NULL; 90839384277SMark Murray retval = -1; 90939384277SMark Murray for (service = &services[0]; *service != NULL; service++) { 91039384277SMark Murray retval = krb5_sname_to_principal(context, NULL, *service, 91139384277SMark Murray KRB5_NT_SRV_HST, &princ); 91239384277SMark Murray if (retval != 0) { 91326ec46c8SStanislav Sedov if (debug) { 91426ec46c8SStanislav Sedov const char *msg = krb5_get_error_message( 91526ec46c8SStanislav Sedov context, retval); 91688c8bcceSJacques Vidrine syslog(LOG_DEBUG, 91788c8bcceSJacques Vidrine "pam_krb5: verify_krb_v5_tgt(): %s: %s", 91826ec46c8SStanislav Sedov "krb5_sname_to_principal()", msg); 91926ec46c8SStanislav Sedov krb5_free_error_message(context, msg); 92026ec46c8SStanislav Sedov } 92139384277SMark Murray return -1; 92239384277SMark Murray } 92339384277SMark Murray 92439384277SMark Murray /* Extract the name directly. */ 92539384277SMark Murray strncpy(phost, compat_princ_component(context, princ, 1), 92639384277SMark Murray BUFSIZ); 92739384277SMark Murray phost[BUFSIZ - 1] = '\0'; 92839384277SMark Murray 92939384277SMark Murray /* 93039384277SMark Murray * Do we have service/<host> keys? 93139384277SMark Murray * (use default/configured keytab, kvno IGNORE_VNO to get the 93239384277SMark Murray * first match, and ignore enctype.) 93339384277SMark Murray */ 93439384277SMark Murray retval = krb5_kt_read_service_key(context, NULL, princ, 0, 0, 93539384277SMark Murray &keyblock); 93639384277SMark Murray if (retval != 0) 93739384277SMark Murray continue; 93839384277SMark Murray break; 93939384277SMark Murray } 94039384277SMark Murray if (keyblock) 94139384277SMark Murray krb5_free_keyblock(context, keyblock); 94239384277SMark Murray 943813847e4SCy Schubert return (retval); 944813847e4SCy Schubert } 945813847e4SCy Schubert 946813847e4SCy Schubert static int 947813847e4SCy Schubert verify_krb_v5_tgt(krb5_context context, krb5_ccache ccache, 948813847e4SCy Schubert char *pam_service __unused, int debug, 949813847e4SCy Schubert const char *service, krb5_principal princ, char phost[static BUFSIZ]) 950813847e4SCy Schubert { 951813847e4SCy Schubert krb5_error_code retval; 952813847e4SCy Schubert krb5_auth_context auth_context = NULL; 953813847e4SCy Schubert krb5_data packet; 954813847e4SCy Schubert 955813847e4SCy Schubert if (service == NULL) 956813847e4SCy Schubert return (0); /* uncertain, can't authenticate KDC */ 957813847e4SCy Schubert 958813847e4SCy Schubert packet.data = 0; 959813847e4SCy Schubert 96039384277SMark Murray /* Talk to the kdc and construct the ticket. */ 96139384277SMark Murray auth_context = NULL; 962813847e4SCy Schubert retval = krb5_mk_req(context, &auth_context, 0, service, phost, 96339384277SMark Murray NULL, ccache, &packet); 96439384277SMark Murray if (auth_context) { 96539384277SMark Murray krb5_auth_con_free(context, auth_context); 96639384277SMark Murray auth_context = NULL; /* setup for rd_req */ 96739384277SMark Murray } 96839384277SMark Murray if (retval) { 96926ec46c8SStanislav Sedov if (debug) { 97026ec46c8SStanislav Sedov const char *msg = krb5_get_error_message(context, 97126ec46c8SStanislav Sedov retval); 97288c8bcceSJacques Vidrine syslog(LOG_DEBUG, 97388c8bcceSJacques Vidrine "pam_krb5: verify_krb_v5_tgt(): %s: %s", 97426ec46c8SStanislav Sedov "krb5_mk_req()", msg); 97526ec46c8SStanislav Sedov krb5_free_error_message(context, msg); 97626ec46c8SStanislav Sedov } 97739384277SMark Murray retval = -1; 97839384277SMark Murray goto cleanup; 97939384277SMark Murray } 98039384277SMark Murray 98139384277SMark Murray /* Try to use the ticket. */ 98239384277SMark Murray retval = krb5_rd_req(context, &auth_context, &packet, princ, NULL, 98339384277SMark Murray NULL, NULL); 98439384277SMark Murray if (retval) { 98526ec46c8SStanislav Sedov if (debug) { 98626ec46c8SStanislav Sedov const char *msg = krb5_get_error_message(context, 98726ec46c8SStanislav Sedov retval); 98888c8bcceSJacques Vidrine syslog(LOG_DEBUG, 98988c8bcceSJacques Vidrine "pam_krb5: verify_krb_v5_tgt(): %s: %s", 99026ec46c8SStanislav Sedov "krb5_rd_req()", msg); 99126ec46c8SStanislav Sedov krb5_free_error_message(context, msg); 99226ec46c8SStanislav Sedov } 99339384277SMark Murray retval = -1; 99439384277SMark Murray } 99539384277SMark Murray else 99639384277SMark Murray retval = 1; 99739384277SMark Murray 99839384277SMark Murray cleanup: 99939384277SMark Murray if (packet.data) 100039384277SMark Murray compat_free_data_contents(context, &packet); 1001813847e4SCy Schubert return (retval); 1002813847e4SCy Schubert } 1003813847e4SCy Schubert 1004813847e4SCy Schubert static void 1005813847e4SCy Schubert verify_krb_v5_tgt_cleanup(krb5_context context, int debug, 1006813847e4SCy Schubert const char *service, krb5_principal princ, char phost[static BUFSIZ] __unused) 1007813847e4SCy Schubert { 1008813847e4SCy Schubert 1009813847e4SCy Schubert if (service) 101039384277SMark Murray krb5_free_principal(context, princ); 1011813847e4SCy Schubert if (debug) 1012813847e4SCy Schubert closelog(); 1013813847e4SCy Schubert 101439384277SMark Murray } 101539384277SMark Murray 101639384277SMark Murray /* Free the memory for cache_name. Called by pam_end() */ 1017b4240e6cSMark Murray /* ARGSUSED */ 101839384277SMark Murray static void 1019c2065008SMark Murray cleanup_cache(pam_handle_t *pamh __unused, void *data, int pam_end_status __unused) 102039384277SMark Murray { 10219c2823baSDag-Erling Smørgrav krb5_context krbctx; 102239384277SMark Murray krb5_ccache ccache; 10237c2274dcSJacques Vidrine krb5_error_code krbret; 102439384277SMark Murray 10259c2823baSDag-Erling Smørgrav if (krb5_init_context(&krbctx)) 102639384277SMark Murray return; 102739384277SMark Murray 10289c2823baSDag-Erling Smørgrav krbret = krb5_cc_resolve(krbctx, data, &ccache); 10297c2274dcSJacques Vidrine if (krbret == 0) 10309c2823baSDag-Erling Smørgrav krb5_cc_destroy(krbctx, ccache); 10319c2823baSDag-Erling Smørgrav krb5_free_context(krbctx); 10327c2274dcSJacques Vidrine free(data); 103339384277SMark Murray } 103439384277SMark Murray 103539384277SMark Murray #ifdef COMPAT_HEIMDAL 103639384277SMark Murray #ifdef COMPAT_MIT 103739384277SMark Murray #error This cannot be MIT and Heimdal compatible! 103839384277SMark Murray #endif 103939384277SMark Murray #endif 104039384277SMark Murray 104139384277SMark Murray #ifndef COMPAT_HEIMDAL 104239384277SMark Murray #ifndef COMPAT_MIT 104339384277SMark Murray #error One of COMPAT_MIT and COMPAT_HEIMDAL must be specified! 104439384277SMark Murray #endif 104539384277SMark Murray #endif 104639384277SMark Murray 104739384277SMark Murray #ifdef COMPAT_HEIMDAL 1048b4240e6cSMark Murray /* ARGSUSED */ 104939384277SMark Murray static const char * 1050c2065008SMark Murray compat_princ_component(krb5_context context __unused, krb5_principal princ, int n) 105139384277SMark Murray { 105239384277SMark Murray return princ->name.name_string.val[n]; 105339384277SMark Murray } 105439384277SMark Murray 1055b4240e6cSMark Murray /* ARGSUSED */ 105639384277SMark Murray static void 1057c2065008SMark Murray compat_free_data_contents(krb5_context context __unused, krb5_data * data) 105839384277SMark Murray { 105939384277SMark Murray krb5_xfree(data->data); 106039384277SMark Murray } 106139384277SMark Murray #endif 106239384277SMark Murray 106339384277SMark Murray #ifdef COMPAT_MIT 106439384277SMark Murray static const char * 106539384277SMark Murray compat_princ_component(krb5_context context, krb5_principal princ, int n) 106639384277SMark Murray { 106739384277SMark Murray return krb5_princ_component(context, princ, n)->data; 106839384277SMark Murray } 106939384277SMark Murray 107039384277SMark Murray static void 107139384277SMark Murray compat_free_data_contents(krb5_context context, krb5_data * data) 107239384277SMark Murray { 107339384277SMark Murray krb5_free_data_contents(context, data); 107439384277SMark Murray } 107539384277SMark Murray #endif 1076