2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
15 #include <afsconfig.h>
16 #include <afs/param.h>
18 #include <security/pam_appl.h>
19 #include <security/pam_modules.h>
24 #include <sys/param.h>
25 #include <afs/kautils.h>
26 #include "afs_message.h"
28 #include "afs_pam_msg.h"
33 #define RET(x) { retcode = (x); goto out; }
36 pam_sm_chauthtok(pam_handle_t * pamh, int flags, int argc, const char **argv)
38 int retcode = PAM_SUCCESS;
39 int errcode = PAM_SUCCESS;
42 int logmask = LOG_UPTO(LOG_INFO);
44 int use_first_pass = 0;
45 int try_first_pass = 0;
47 int got_authtok = 0; /* got PAM_AUTHTOK upon entry */
48 int torch_password = 1;
50 char my_password_buf[256];
55 char *user = NULL, *password = NULL;
56 char *new_password = NULL, *verify_password = NULL;
57 char upwd_buf[2048]; /* size is a guess. */
59 struct ktc_encryptionKey oldkey, newkey;
60 struct ktc_token token;
61 struct ubik_client *conn = 0;
62 struct pam_conv *pam_convp = NULL;
63 struct passwd unix_pwd, *upwd = NULL;
66 openlog(pam_afs_ident, LOG_CONS, LOG_AUTH);
68 origmask = setlogmask(logmask);
71 * Parse the user options. Log an error for any unknown options.
73 * Todo options: PAM_SILENT
75 for (i = 0; i < argc; i++) {
76 if (strcasecmp(argv[i], "debug") == 0) {
77 logmask |= LOG_MASK(LOG_DEBUG);
78 (void)setlogmask(logmask);
79 } else if (strcasecmp(argv[i], "nowarn") == 0) {
81 } else if (strcasecmp(argv[i], "use_first_pass") == 0) {
83 } else if (strcasecmp(argv[i], "try_first_pass") == 0) {
85 } else if (strcasecmp(argv[i], "ignore_root") == 0) {
88 pam_afs_syslog(LOG_ERR, PAMAFS_UNKNOWNOPT, argv[i]);
95 if (logmask && LOG_MASK(LOG_DEBUG)) {
96 pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass,
98 pam_afs_syslog(LOG_DEBUG, PAMAFS_PAMERROR, flags);
101 /* Try to get the user-interaction info, if available. */
102 errcode = pam_get_item(pamh, PAM_CONV, (const void **)&pam_convp);
103 if (errcode != PAM_SUCCESS) {
104 pam_afs_syslog(LOG_WARNING, PAMAFS_NO_USER_INT);
108 /* Who are we trying to authenticate here? */
110 pam_get_user(pamh, (const char **)&user,
111 "AFS username: ")) != PAM_SUCCESS) {
112 pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
113 RET(PAM_USER_UNKNOWN);
116 if (logmask && LOG_MASK(LOG_DEBUG))
117 pam_afs_syslog(LOG_DEBUG, PAMAFS_USERNAMEDEBUG, user);
120 * If the user has a "local" (or via nss, possibly nss_dce) pwent,
121 * and its uid==0, and "ignore_root" was given in pam.conf,
124 #if defined(AFS_HPUX_ENV)
125 #if defined(AFS_HPUX110_ENV)
126 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
127 #else /* AFS_HPUX110_ENV */
128 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
129 if (i == 0) /* getpwnam_r success */
131 #endif /* else AFS_HPUX110_ENV */
132 if (ignore_root && i == 0 && upwd->pw_uid == 0) {
133 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
137 #if defined(AFS_LINUX20_ENV) || defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV) || defined(AFS_NBSD_ENV)
138 upwd = getpwnam(user);
140 upwd = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
142 if (ignore_root && upwd != NULL && upwd->pw_uid == 0) {
143 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
148 errcode = pam_get_item(pamh, PAM_AUTHTOK, (const void **)&password);
149 if (errcode != PAM_SUCCESS || password == NULL) {
150 if (use_first_pass) {
151 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
154 password = NULL; /* In case it isn't already NULL */
155 if (logmask && LOG_MASK(LOG_DEBUG))
156 pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
157 } else if (password[0] == '\0') {
158 /* Actually we *did* get one but it was empty. */
160 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
161 RET(PAM_NEW_AUTHTOK_REQD);
163 if (logmask && LOG_MASK(LOG_DEBUG))
164 pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
168 if (!(use_first_pass || try_first_pass)) {
172 if (password == NULL) {
175 RET(PAM_AUTH_ERR); /* shouldn't happen */
178 if (pam_convp == NULL || pam_convp->conv == NULL) {
179 pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
183 errcode = pam_afs_prompt(pam_convp, &password, 0, PAMAFS_PWD_PROMPT);
184 if (errcode != PAM_SUCCESS || password == NULL) {
185 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
188 if (password[0] == '\0') {
189 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
190 RET(PAM_NEW_AUTHTOK_REQD);
194 * We aren't going to free the password later (we will wipe it,
195 * though), because the storage for it if we get it from other
196 * paths may belong to someone else. Since we do need to free
197 * this storage, copy it to a buffer that won't need to be freed
198 * later, and free this storage now.
200 strncpy(my_password_buf, password, sizeof(my_password_buf));
201 my_password_buf[sizeof(my_password_buf) - 1] = '\0';
202 memset(password, 0, strlen(password));
204 password = my_password_buf;
207 if ((code = ka_VerifyUserPassword(KA_USERAUTH_VERSION + KA_USERAUTH_DOSETPAG, user, /* kerberos name */
210 password, /* password */
212 &reason /* error string */ )) != 0) {
213 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
217 pam_set_item(pamh, PAM_AUTHTOK, password);
218 pam_set_item(pamh, PAM_OLDAUTHTOK, password);
219 if (flags & PAM_PRELIM_CHECK) {
220 /* only auth check was requested, so return success here */
221 return (PAM_SUCCESS);
223 if (!(flags & PAM_UPDATE_AUTHTOK)) {
224 /* these lines are never executed ... */
225 /* UPDATE_AUTHTOK flag is required, return with error */
226 pam_afs_syslog(LOG_ERR, PAMAFS_FLAGS, "PAM_UPDATE_AUTHTOK");
230 /* get the new passwd and verify it */
232 pam_afs_prompt(pam_convp, &new_password, 0, PAMAFS_NEW_PWD_PROMPT);
233 if (errcode != PAM_SUCCESS || new_password == NULL) {
234 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
237 if (new_password[0] == '\0') {
238 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
242 pam_afs_prompt(pam_convp, &verify_password, 0,
243 PAMAFS_VERIFY_PWD_PROMPT);
244 if (errcode != PAM_SUCCESS || verify_password == NULL) {
245 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
246 memset(new_password, 0, strlen(new_password));
249 if (verify_password[0] == '\0') {
250 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
251 memset(new_password, 0, strlen(new_password));
254 if (strcmp(new_password, verify_password) != 0) {
255 pam_afs_syslog(LOG_INFO, PAMAFS_NE_PASSWORD);
256 memset(new_password, 0, strlen(new_password));
257 memset(verify_password, 0, strlen(verify_password));
260 memset(verify_password, 0, strlen(verify_password));
261 /* checking password length and quality is up to other PAM modules */
263 /* set the new password */
264 if ((code = ka_Init(0)) != 0) {
265 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
268 if ((code = rx_Init(0)) != 0) {
269 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
272 strcpy(instance, "");
273 if ((localcell = ka_LocalCell()) == NULL) {
274 pam_afs_syslog(LOG_ERR, PAMAFS_NOCELLNAME);
277 strcpy(realm, localcell);
279 /* oldkey is not used in ka_ChangePassword (only for ka_auth) */
280 ka_StringToKey(password, realm, &oldkey);
281 ka_StringToKey(new_password, realm, &newkey);
283 ka_GetAdminToken(user, instance, realm, &oldkey, 20, &token,
285 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
289 ka_AuthServerConn(realm, KA_MAINTENANCE_SERVICE, &token,
291 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
294 if ((code = ka_ChangePassword(user, /* kerberos name */
295 instance, /* instance */
297 0, /* old password unused */
298 &newkey /* new password */ )) != 0) {
299 pam_afs_syslog(LOG_ERR, PAMAFS_KAPASS_FAIL);
300 memset(new_password, 0, strlen(new_password));
303 pam_set_item(pamh, PAM_AUTHTOK, new_password);
308 if (password && torch_password) {
309 memset(password, 0, strlen(password));
311 (void)setlogmask(origmask);
312 #ifndef AFS_SUN56_ENV