Update sample program from OpenPAM repo.
This commit is contained in:
Dag-Erling Smørgrav
parent
f5b32f0bef
commit
045ae674b4
Notes:
svn2git
2020-12-08 03:00:23 +00:00
svn path=/head/; revision=13318
1 changed files with 113 additions and 72 deletions
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@ -1,5 +1,5 @@
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/*-
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* Copyright (c) 2002 Networks Associates Technologies, Inc.
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by ThinkSec AS and
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@ -31,6 +31,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $P4: //depot/projects/openpam/bin/su/su.c#7 $
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* $FreeBSD$
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*/
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@ -38,12 +39,17 @@
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#include <sys/wait.h>
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#include <err.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <security/pam_appl.h>
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#include <security/pam_misc.h>
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#include <security/openpam.h> /* for openpam_ttyconv() */
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extern char **environ;
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static pam_handle_t *pamh;
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static struct pam_conv pamc;
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@ -51,89 +57,124 @@ static struct pam_conv pamc;
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static void
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usage(void)
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{
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fprintf(stderr, "Usage: su [login [args]]\n");
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exit(1);
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}
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static int
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check(char *func, int pam_err)
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{
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if (pam_err == PAM_SUCCESS || pam_err == PAM_NEW_AUTHTOK_REQD)
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return pam_err;
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openlog("su", LOG_CONS, LOG_AUTH);
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syslog(LOG_ERR, "%s(): %s", func, pam_strerror(pamh, pam_err));
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errx(1, "Sorry.");
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fprintf(stderr, "Usage: su [login [args]]\n");
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exit(1);
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}
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int
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main(int argc, char *argv[])
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{
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char hostname[MAXHOSTNAMELEN];
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const char *user, *tty;
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int o, status;
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pid_t pid;
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char hostname[MAXHOSTNAMELEN];
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const char *user, *tty;
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char **args, **pam_envlist, **pam_env;
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struct passwd *pwd;
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int o, pam_err, status;
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pid_t pid;
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while ((o = getopt(argc, argv, "h")) != -1)
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switch (o) {
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case 'h':
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default:
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usage();
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}
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while ((o = getopt(argc, argv, "h")) != -1)
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switch (o) {
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case 'h':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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argc -= optind;
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argv += optind;
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if (argc > 0)
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user = *argv;
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else
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user = "root";
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/* initialize PAM */
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pamc.conv = &openpam_ttyconv;
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pam_start("su", argc ? *argv : "root", &pamc, &pamh);
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/* initialize PAM */
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pamc.conv = &misc_conv;
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pam_start("su", user, &pamc, &pamh);
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/* set some items */
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gethostname(hostname, sizeof(hostname));
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if ((pam_err = pam_set_item(pamh, PAM_RHOST, hostname)) != PAM_SUCCESS)
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goto pamerr;
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user = getlogin();
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if ((pam_err = pam_set_item(pamh, PAM_RUSER, user)) != PAM_SUCCESS)
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goto pamerr;
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tty = ttyname(STDERR_FILENO);
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if ((pam_err = pam_set_item(pamh, PAM_TTY, tty)) != PAM_SUCCESS)
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goto pamerr;
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/* set some items */
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gethostname(hostname, sizeof hostname);
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check("pam_set_item", pam_set_item(pamh, PAM_RHOST, hostname));
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user = getlogin();
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check("pam_set_item", pam_set_item(pamh, PAM_RUSER, user));
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tty = ttyname(STDERR_FILENO);
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check("pam_set_item", pam_set_item(pamh, PAM_TTY, tty));
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/* authenticate the applicant */
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if ((pam_err = pam_authenticate(pamh, 0)) != PAM_SUCCESS)
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goto pamerr;
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if ((pam_err = pam_acct_mgmt(pamh, 0)) == PAM_NEW_AUTHTOK_REQD)
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pam_err = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
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if (pam_err != PAM_SUCCESS)
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goto pamerr;
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/* authenticate the applicant */
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check("pam_authenticate", pam_authenticate(pamh, 0));
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if (check("pam_acct_mgmt", pam_acct_mgmt(pamh, 0)) ==
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PAM_NEW_AUTHTOK_REQD)
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check("pam_chauthtok",
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pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK));
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/* establish the requested credentials */
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check("pam_setcred", pam_setcred(pamh, PAM_ESTABLISH_CRED));
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/* authentication succeeded; open a session */
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check("pam_open_session", pam_open_session(pamh, 0));
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/* establish the requested credentials */
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if ((pam_err = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS)
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goto pamerr;
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switch ((pid = fork())) {
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case -1:
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err(1, "fork()");
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case 0:
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/* child: start a shell */
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*argv = "/bin/sh";
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execvp(*argv, argv);
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err(1, "execvp()");
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default:
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/* parent: wait for child to exit */
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waitpid(pid, &status, 0);
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if (WIFEXITED(status))
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status = WEXITSTATUS(status);
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else
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status = 1;
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}
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/* authentication succeeded; open a session */
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if ((pam_err = pam_open_session(pamh, 0)) != PAM_SUCCESS)
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goto pamerr;
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/* close the session and release PAM resources */
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check("pam_close_session", pam_close_session(pamh, 0));
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check("pam_setcred", pam_setcred(pamh, PAM_DELETE_CRED));
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check("pam_end", pam_end(pamh, 0));
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/* get mapped user name; PAM may have changed it */
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pam_err = pam_get_item(pamh, PAM_USER, (const void **)&user);
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if (pam_err != PAM_SUCCESS || (pwd = getpwnam(user)) == NULL)
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goto pamerr;
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exit(status);
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/* set uid and groups */
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if (initgroups(pwd->pw_name, pwd->pw_gid) == -1) {
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warn("initgroups()");
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goto err;
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}
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if (setgid(pwd->pw_gid) == -1) {
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warn("setgid()");
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goto err;
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}
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if (setuid(pwd->pw_uid) == -1) {
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warn("setuid()");
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goto err;
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}
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/* export PAM environment */
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if ((pam_envlist = pam_getenvlist(pamh)) != NULL) {
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for (pam_env = pam_envlist; *pam_env != NULL; ++pam_env) {
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putenv(*pam_env);
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free(*pam_env);
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}
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free(pam_envlist);
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}
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/* build argument list */
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if ((args = calloc(argc + 2, sizeof *args)) == NULL) {
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warn("calloc()");
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goto err;
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}
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*args = pwd->pw_shell;
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memcpy(args + 1, argv, argc * sizeof *args);
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/* fork and exec */
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switch ((pid = fork())) {
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case -1:
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warn("fork()");
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goto err;
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case 0:
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/* child: start a shell */
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execve(*args, args, environ);
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warn("execve()");
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_exit(1);
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default:
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/* parent: wait for child to exit */
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waitpid(pid, &status, 0);
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/* close the session and release PAM resources */
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pam_err = pam_close_session(pamh, 0);
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pam_end(pamh, pam_err);
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exit(WEXITSTATUS(status));
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}
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pamerr:
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pam_end(pamh, pam_err);
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fprintf(stderr, "Sorry\n");
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exit(1);
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err:
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pam_end(pamh, pam_err);
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exit(1);
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}
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