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pam_exec.c revision 1.1 
      1 /*-
      2  * Copyright (c) 2001,2003 Networks Associates Technology, Inc.
      3  * All rights reserved.
      4  *
      5  * This software was developed for the FreeBSD Project by ThinkSec AS and
      6  * NAI Labs, the Security Research Division of Network Associates, Inc.
      7  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
      8  * DARPA CHATS research program.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. The name of the author may not be used to endorse or promote
     19  *    products derived from this software without specific prior written
     20  *    permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_exec/pam_exec.c,v 1.3 2003/02/06 12:56:51 des Exp $");
     37 
     38 #include <sys/types.h>
     39 #include <sys/wait.h>
     40 
     41 #include <errno.h>
     42 #include <stdlib.h>
     43 #include <string.h>
     44 #include <unistd.h>
     45 
     46 #include <security/pam_appl.h>
     47 #include <security/pam_modules.h>
     48 #include <security/openpam.h>
     49 
     50 static int
     51 _pam_exec(pam_handle_t *pamh __unused, int flags __unused,
     52     int argc, const char *argv[])
     53 {
     54 	int childerr, status;
     55 	char **env, **envlist;
     56 	pid_t pid;
     57 
     58 	if (argc < 1)
     59 		return (PAM_SERVICE_ERR);
     60 
     61 	/*
     62 	 * XXX For additional credit, divert child's stdin/stdout/stderr
     63 	 * to the conversation function.
     64 	 */
     65 	envlist = pam_getenvlist(pamh);
     66 	childerr = 0;
     67 	if ((pid = vfork()) == 0) {
     68 		execve(argv[0], argv, envlist);
     69 		childerr = errno;
     70 		_exit(1);
     71 	}
     72 	for (env = envlist; *env != NULL; ++env)
     73 		free(*env);
     74 	free(envlist);
     75 	if (pid == -1) {
     76 		openpam_log(PAM_LOG_ERROR, "vfork(): %m");
     77 		return (PAM_SYSTEM_ERR);
     78 	}
     79 	if (waitpid(pid, &status, 0) == -1) {
     80 		openpam_log(PAM_LOG_ERROR, "waitpid(): %m");
     81 		return (PAM_SYSTEM_ERR);
     82 	}
     83 	if (childerr != 0) {
     84 		openpam_log(PAM_LOG_ERROR, "execv(): %m");
     85 		return (PAM_SYSTEM_ERR);
     86 	}
     87 	if (WIFSIGNALED(status)) {
     88 		openpam_log(PAM_LOG_ERROR, "%s caught signal %d%s",
     89 		    argv[0], WTERMSIG(status),
     90 		    WCOREDUMP(status) ? " (core dumped)" : "");
     91 		return (PAM_SYSTEM_ERR);
     92 	}
     93 	if (!WIFEXITED(status)) {
     94 		openpam_log(PAM_LOG_ERROR, "unknown status 0x%x", status);
     95 		return (PAM_SYSTEM_ERR);
     96 	}
     97 	if (WEXITSTATUS(status) != 0) {
     98 		openpam_log(PAM_LOG_ERROR, "%s returned code %d",
     99 		    argv[0], WEXITSTATUS(status));
    100 		return (PAM_SYSTEM_ERR);
    101 	}
    102 	return (PAM_SUCCESS);
    103 }
    104 
    105 PAM_EXTERN int
    106 pam_sm_authenticate(pam_handle_t *pamh, int flags,
    107     int argc, const char *argv[])
    108 {
    109 
    110 	return (_pam_exec(pamh, flags, argc, argv));
    111 }
    112 
    113 PAM_EXTERN int
    114 pam_sm_setcred(pam_handle_t *pamh, int flags,
    115     int argc, const char *argv[])
    116 {
    117 
    118 	return (_pam_exec(pamh, flags, argc, argv));
    119 }
    120 
    121 PAM_EXTERN int
    122 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
    123     int argc, const char *argv[])
    124 {
    125 
    126 	return (_pam_exec(pamh, flags, argc, argv));
    127 }
    128 
    129 PAM_EXTERN int
    130 pam_sm_open_session(pam_handle_t *pamh, int flags,
    131     int argc, const char *argv[])
    132 {
    133 
    134 	return (_pam_exec(pamh, flags, argc, argv));
    135 }
    136 
    137 PAM_EXTERN int
    138 pam_sm_close_session(pam_handle_t *pamh, int flags,
    139     int argc, const char *argv[])
    140 {
    141 
    142 	return (_pam_exec(pamh, flags, argc, argv));
    143 }
    144 
    145 PAM_EXTERN int
    146 pam_sm_chauthtok(pam_handle_t *pamh, int flags,
    147     int argc, const char *argv[])
    148 {
    149 
    150 	return (_pam_exec(pamh, flags, argc, argv));
    151 }
    152 
    153 PAM_MODULE_ENTRY("pam_exec");
    154