+/*
+ * Copyright 2000, International Business Machines Corporation and others.
+ * All Rights Reserved.
+ *
+ * This software has been released under the terms of the IBM Public
+ * License. For details, see the LICENSE file in the top-level source
+ * directory or online at http://www.openafs.org/dl/license10.html
+ */
+
+#include <afsconfig.h>
+#include <afs/param.h>
+
+#include <roken.h>
+
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
#include <security/pam_appl.h>
#include <security/pam_modules.h>
+#include <afs/kautils.h>
+#include "afs_message.h"
+#include "afs_util.h"
+#include "afs_pam_msg.h"
+
+#define RET(x) { retcode = (x); goto out; }
+
extern int
-pam_sm_chauthtok(
- pam_handle_t *pamh,
- int flags,
- int argc,
- const char **argv)
+pam_sm_chauthtok(pam_handle_t * pamh, int flags, int argc, const char **argv)
{
- return PAM_PERM_DENIED;
+ int retcode = PAM_SUCCESS;
+ int errcode = PAM_SUCCESS;
+ int code;
+ int origmask;
+ int logmask = LOG_UPTO(LOG_INFO);
+ int nowarn = 0;
+ int use_first_pass = 0;
+ int try_first_pass = 0;
+ int ignore_root = 0;
+ int got_authtok = 0; /* got PAM_AUTHTOK upon entry */
+ int torch_password = 1;
+ int i;
+ char my_password_buf[256];
+ char instance[256];
+ char realm[256];
+ char cell[256];
+ char *localcell;
+ char *user = NULL, *password = NULL;
+ char *new_password = NULL, *verify_password = NULL;
+ char upwd_buf[2048]; /* size is a guess. */
+ char *reason = NULL;
+ struct ktc_encryptionKey oldkey, newkey;
+ struct ktc_token token;
+ struct ubik_client *conn = 0;
+ struct pam_conv *pam_convp = NULL;
+ struct passwd unix_pwd, *upwd = NULL;
+
+#ifndef AFS_SUN56_ENV
+ openlog(pam_afs_ident, LOG_CONS, LOG_AUTH);
+#endif
+ origmask = setlogmask(logmask);
+
+ /*
+ * Parse the user options. Log an error for any unknown options.
+ *
+ * Todo options: PAM_SILENT
+ */
+ for (i = 0; i < argc; i++) {
+ if (strcasecmp(argv[i], "debug") == 0) {
+ logmask |= LOG_MASK(LOG_DEBUG);
+ (void)setlogmask(logmask);
+ } else if (strcasecmp(argv[i], "nowarn") == 0) {
+ nowarn = 1;
+ } else if (strcasecmp(argv[i], "use_first_pass") == 0) {
+ use_first_pass = 1;
+ } else if (strcasecmp(argv[i], "try_first_pass") == 0) {
+ try_first_pass = 1;
+ } else if (strcasecmp(argv[i], "ignore_root") == 0) {
+ ignore_root = 1;
+ } else {
+ pam_afs_syslog(LOG_ERR, PAMAFS_UNKNOWNOPT, argv[i]);
+ }
+ }
+
+ if (use_first_pass)
+ try_first_pass = 0;
+
+ if (logmask && LOG_MASK(LOG_DEBUG)) {
+ pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass,
+ try_first_pass);
+ pam_afs_syslog(LOG_DEBUG, PAMAFS_PAMERROR, flags);
+ }
+
+ /* Try to get the user-interaction info, if available. */
+ errcode = pam_get_item(pamh, PAM_CONV, (const void **)&pam_convp);
+ if (errcode != PAM_SUCCESS) {
+ pam_afs_syslog(LOG_WARNING, PAMAFS_NO_USER_INT);
+ pam_convp = NULL;
+ }
+
+ /* Who are we trying to authenticate here? */
+ if ((errcode =
+ pam_get_user(pamh, (const char **)&user,
+ "AFS username: ")) != PAM_SUCCESS) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
+ RET(PAM_USER_UNKNOWN);
+ }
+
+ if (logmask && LOG_MASK(LOG_DEBUG))
+ pam_afs_syslog(LOG_DEBUG, PAMAFS_USERNAMEDEBUG, user);
+
+ /*
+ * If the user has a "local" (or via nss, possibly nss_dce) pwent,
+ * and its uid==0, and "ignore_root" was given in pam.conf,
+ * ignore the user.
+ */
+#if defined(AFS_HPUX_ENV) || defined(AFS_DARWIN100_ENV) || defined(AFS_SUN58_ENV)
+#if defined(AFS_HPUX110_ENV) || defined(AFS_DARWIN100_ENV) || defined(AFS_SUN58_ENV)
+ i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
+#else /* AFS_HPUX110_ENV */
+ i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
+ if (i == 0) /* getpwnam_r success */
+ upwd = &unix_pwd;
+#endif /* else AFS_HPUX110_ENV */
+ if (ignore_root && i == 0 && upwd->pw_uid == 0) {
+ pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
+ RET(PAM_AUTH_ERR);
+ }
+#else
+#if defined(AFS_LINUX20_ENV) || defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV) || defined(AFS_NBSD_ENV)
+ upwd = getpwnam(user);
+#else
+ upwd = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
+#endif
+ if (ignore_root && upwd != NULL && upwd->pw_uid == 0) {
+ pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
+ RET(PAM_AUTH_ERR);
+ }
+#endif
+
+ errcode = pam_get_item(pamh, PAM_AUTHTOK, (const void **)&password);
+ if (errcode != PAM_SUCCESS || password == NULL) {
+ if (use_first_pass) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
+ RET(PAM_AUTH_ERR);
+ }
+ password = NULL; /* In case it isn't already NULL */
+ if (logmask && LOG_MASK(LOG_DEBUG))
+ pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
+ } else if (password[0] == '\0') {
+ /* Actually we *did* get one but it was empty. */
+ torch_password = 0;
+ pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
+ RET(PAM_NEW_AUTHTOK_REQD);
+ } else {
+ if (logmask && LOG_MASK(LOG_DEBUG))
+ pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
+ torch_password = 0;
+ got_authtok = 1;
+ }
+ if (!(use_first_pass || try_first_pass)) {
+ password = NULL;
+ }
+
+ if (password == NULL) {
+ torch_password = 1;
+ if (use_first_pass)
+ RET(PAM_AUTH_ERR); /* shouldn't happen */
+ if (try_first_pass)
+ try_first_pass = 0;
+ if (pam_convp == NULL || pam_convp->conv == NULL) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
+ RET(PAM_AUTH_ERR);
+ }
+
+ errcode = pam_afs_prompt(pam_convp, &password, 0, PAMAFS_PWD_PROMPT);
+ if (errcode != PAM_SUCCESS || password == NULL) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
+ RET(PAM_AUTH_ERR);
+ }
+ if (password[0] == '\0') {
+ pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
+ RET(PAM_NEW_AUTHTOK_REQD);
+ }
+
+ /*
+ * We aren't going to free the password later (we will wipe it,
+ * though), because the storage for it if we get it from other
+ * paths may belong to someone else. Since we do need to free
+ * this storage, copy it to a buffer that won't need to be freed
+ * later, and free this storage now.
+ */
+ strncpy(my_password_buf, password, sizeof(my_password_buf));
+ my_password_buf[sizeof(my_password_buf) - 1] = '\0';
+ memset(password, 0, strlen(password));
+ free(password);
+ password = my_password_buf;
+ }
+
+ if ((code = ka_VerifyUserPassword(KA_USERAUTH_VERSION + KA_USERAUTH_DOSETPAG, user, /* kerberos name */
+ NULL, /* instance */
+ NULL, /* realm */
+ password, /* password */
+ 0, /* spare 2 */
+ &reason /* error string */ )) != 0) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
+ RET(PAM_AUTH_ERR);
+ }
+ torch_password = 0;
+ pam_set_item(pamh, PAM_AUTHTOK, password);
+ pam_set_item(pamh, PAM_OLDAUTHTOK, password);
+ if (flags & PAM_PRELIM_CHECK) {
+ /* only auth check was requested, so return success here */
+ return (PAM_SUCCESS);
+ }
+ if (!(flags & PAM_UPDATE_AUTHTOK)) {
+ /* these lines are never executed ... */
+ /* UPDATE_AUTHTOK flag is required, return with error */
+ pam_afs_syslog(LOG_ERR, PAMAFS_FLAGS, "PAM_UPDATE_AUTHTOK");
+ RET(PAM_AUTH_ERR);
+ }
+
+ /* get the new passwd and verify it */
+ errcode =
+ pam_afs_prompt(pam_convp, &new_password, 0, PAMAFS_NEW_PWD_PROMPT);
+ if (errcode != PAM_SUCCESS || new_password == NULL) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
+ RET(PAM_AUTH_ERR);
+ }
+ if (new_password[0] == '\0') {
+ pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
+ RET(PAM_AUTH_ERR);
+ }
+ errcode =
+ pam_afs_prompt(pam_convp, &verify_password, 0,
+ PAMAFS_VERIFY_PWD_PROMPT);
+ if (errcode != PAM_SUCCESS || verify_password == NULL) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
+ memset(new_password, 0, strlen(new_password));
+ RET(PAM_AUTH_ERR);
+ }
+ if (verify_password[0] == '\0') {
+ pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
+ memset(new_password, 0, strlen(new_password));
+ RET(PAM_AUTH_ERR);
+ }
+ if (strcmp(new_password, verify_password) != 0) {
+ pam_afs_syslog(LOG_INFO, PAMAFS_NE_PASSWORD);
+ memset(new_password, 0, strlen(new_password));
+ memset(verify_password, 0, strlen(verify_password));
+ RET(PAM_AUTH_ERR);
+ }
+ memset(verify_password, 0, strlen(verify_password));
+ /* checking password length and quality is up to other PAM modules */
+
+ /* set the new password */
+ if ((code = ka_Init(0)) != 0) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
+ RET(PAM_AUTH_ERR);
+ }
+ if ((code = rx_Init(0)) != 0) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
+ RET(PAM_AUTH_ERR);
+ }
+ strcpy(instance, "");
+ if ((localcell = ka_LocalCell()) == NULL) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_NOCELLNAME);
+ RET(PAM_AUTH_ERR);
+ }
+ strcpy(realm, localcell);
+ strcpy(cell, realm);
+ /* oldkey is not used in ka_ChangePassword (only for ka_auth) */
+ ka_StringToKey(password, realm, &oldkey);
+ ka_StringToKey(new_password, realm, &newkey);
+ if ((code =
+ ka_GetAdminToken(user, instance, realm, &oldkey, 20, &token,
+ 0)) != 0) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
+ RET(PAM_AUTH_ERR);
+ }
+ if ((code =
+ ka_AuthServerConn(realm, KA_MAINTENANCE_SERVICE, &token,
+ &conn)) != 0) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
+ RET(PAM_AUTH_ERR);
+ }
+ if ((code = ka_ChangePassword(user, /* kerberos name */
+ instance, /* instance */
+ conn, /* conn */
+ 0, /* old password unused */
+ &newkey /* new password */ )) != 0) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_KAPASS_FAIL);
+ memset(new_password, 0, strlen(new_password));
+ RET(PAM_AUTH_ERR);
+ } else {
+ pam_set_item(pamh, PAM_AUTHTOK, new_password);
+ RET(PAM_SUCCESS);
+ }
+
+ out:
+ if (password && torch_password) {
+ memset(password, 0, strlen(password));
+ }
+ (void)setlogmask(origmask);
+#ifndef AFS_SUN56_ENV
+ closelog();
+#endif
+ return retcode;
}
git://git.openafs.org / openafs.git / blobdiff