| File: | rc/gs-auth-pam.c |
| Warning: | line 280, column 2 Value stored to 'res' is never read |
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| 1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- |
| 2 | * |
| 3 | * Copyright (C) 2006 William Jon McCann <mccann@jhu.edu> |
| 4 | * Copyright (C) 2006 Ray Strode <rstrode@redhat.com> |
| 5 | * Copyright (C) 2003 Bill Nottingham <notting@redhat.com> |
| 6 | * Copyright (c) 1993-2003 Jamie Zawinski <jwz@jwz.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of the |
| 11 | * License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but |
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 21 | * 02110-1301, USA. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include "config.h" |
| 26 | |
| 27 | #include <stdlib.h> |
| 28 | #ifdef HAVE_UNISTD_H1 |
| 29 | # include <unistd.h> |
| 30 | #endif |
| 31 | |
| 32 | #include <fcntl.h> |
| 33 | #include <stdio.h> |
| 34 | #include <string.h> |
| 35 | #include <sys/types.h> |
| 36 | #include <pwd.h> |
| 37 | #include <grp.h> |
| 38 | #include <security/pam_appl.h> |
| 39 | #include <signal.h> |
| 40 | #include <errno(*__errno_location ()).h> |
| 41 | |
| 42 | #include <glib.h> |
| 43 | #include <glib/gstdio.h> |
| 44 | #include <glib/gi18n.h> |
| 45 | #include <ctk/ctk.h> |
| 46 | |
| 47 | #include "gs-auth.h" |
| 48 | |
| 49 | #include "subprocs.h" |
| 50 | |
| 51 | /* Some time between Red Hat 4.2 and 7.0, the words were transposed |
| 52 | in the various PAM_x_CRED macro names. Yay! |
| 53 | */ |
| 54 | #ifndef PAM_REFRESH_CRED0x0010U |
| 55 | # define PAM_REFRESH_CRED0x0010U PAM_CRED_REFRESH |
| 56 | #endif |
| 57 | |
| 58 | #ifdef HAVE_PAM_FAIL_DELAY |
| 59 | /* We handle delays ourself.*/ |
| 60 | /* Don't set this to 0 (Linux bug workaround.) */ |
| 61 | # define PAM_NO_DELAY(pamh)pam_fail_delay ((pamh), 1) pam_fail_delay ((pamh), 1) |
| 62 | #else /* !HAVE_PAM_FAIL_DELAY */ |
| 63 | # define PAM_NO_DELAY(pamh)pam_fail_delay ((pamh), 1) /* */ |
| 64 | #endif /* !HAVE_PAM_FAIL_DELAY */ |
| 65 | |
| 66 | |
| 67 | /* On SunOS 5.6, and on Linux with PAM 0.64, pam_strerror() takes two args. |
| 68 | On some other Linux systems with some other version of PAM (e.g., |
| 69 | whichever Debian release comes with a 2.2.5 kernel) it takes one arg. |
| 70 | I can't tell which is more "recent" or "correct" behavior, so configure |
| 71 | figures out which is in use for us. Shoot me! |
| 72 | */ |
| 73 | #ifdef PAM_STRERROR_TWO_ARGS1 |
| 74 | # define PAM_STRERROR(pamh, status)pam_strerror((pamh), (status)) pam_strerror((pamh), (status)) |
| 75 | #else /* !PAM_STRERROR_TWO_ARGS */ |
| 76 | # define PAM_STRERROR(pamh, status)pam_strerror((pamh), (status)) pam_strerror((status)) |
| 77 | #endif /* !PAM_STRERROR_TWO_ARGS */ |
| 78 | |
| 79 | static gboolean verbose_enabled = FALSE(0); |
| 80 | static pam_handle_t *pam_handle = NULL((void*)0); |
| 81 | static gboolean did_we_ask_for_password = FALSE(0); |
| 82 | |
| 83 | struct pam_closure |
| 84 | { |
| 85 | const char *username; |
| 86 | GSAuthMessageFunc cb_func; |
| 87 | gpointer cb_data; |
| 88 | int signal_fd; |
| 89 | int result; |
| 90 | }; |
| 91 | |
| 92 | typedef struct |
| 93 | { |
| 94 | struct pam_closure *closure; |
| 95 | GSAuthMessageStyle style; |
| 96 | const char *msg; |
| 97 | char **resp; |
| 98 | gboolean should_interrupt_stack; |
| 99 | } GsAuthMessageHandlerData; |
| 100 | |
| 101 | static GCond message_handled_condition; |
| 102 | static GMutex message_handler_mutex; |
| 103 | |
| 104 | GQuark |
| 105 | gs_auth_error_quark (void) |
| 106 | { |
| 107 | static GQuark quark = 0; |
| 108 | if (! quark) |
| 109 | { |
| 110 | quark = g_quark_from_static_string ("gs_auth_error"); |
| 111 | } |
| 112 | |
| 113 | return quark; |
| 114 | } |
| 115 | |
| 116 | void |
| 117 | gs_auth_set_verbose (gboolean enabled) |
| 118 | { |
| 119 | verbose_enabled = enabled; |
| 120 | } |
| 121 | |
| 122 | gboolean |
| 123 | gs_auth_get_verbose (void) |
| 124 | { |
| 125 | return verbose_enabled; |
| 126 | } |
| 127 | |
| 128 | static GSAuthMessageStyle |
| 129 | pam_style_to_gs_style (int pam_style) |
| 130 | { |
| 131 | GSAuthMessageStyle style; |
| 132 | |
| 133 | switch (pam_style) |
| 134 | { |
| 135 | case PAM_PROMPT_ECHO_ON2: |
| 136 | style = GS_AUTH_MESSAGE_PROMPT_ECHO_ON; |
| 137 | break; |
| 138 | case PAM_PROMPT_ECHO_OFF1: |
| 139 | style = GS_AUTH_MESSAGE_PROMPT_ECHO_OFF; |
| 140 | break; |
| 141 | case PAM_ERROR_MSG3: |
| 142 | style = GS_AUTH_MESSAGE_ERROR_MSG; |
| 143 | break; |
| 144 | case PAM_TEXT_INFO4: |
| 145 | style = GS_AUTH_MESSAGE_TEXT_INFO; |
| 146 | break; |
| 147 | default: |
| 148 | g_assert_not_reached ()do { (void) 0; __builtin_unreachable (); } while (0); |
| 149 | break; |
| 150 | } |
| 151 | |
| 152 | return style; |
| 153 | } |
| 154 | |
| 155 | static gboolean |
| 156 | auth_message_handler (GSAuthMessageStyle style, |
| 157 | const char *msg, |
| 158 | char **response, |
| 159 | gpointer data) |
| 160 | { |
| 161 | gboolean ret; |
| 162 | |
| 163 | ret = TRUE(!(0)); |
| 164 | *response = NULL((void*)0); |
| 165 | |
| 166 | switch (style) |
| 167 | { |
| 168 | case GS_AUTH_MESSAGE_PROMPT_ECHO_ON: |
| 169 | break; |
| 170 | case GS_AUTH_MESSAGE_PROMPT_ECHO_OFF: |
| 171 | if (msg != NULL((void*)0) && g_str_has_prefix (msg, _("Password:"))(__builtin_constant_p (gettext ("Password:"))? __extension__ ( { const char * const __str = (msg); const char * const __prefix = (gettext ("Password:")); gboolean __result = (0); if (__str == ((void*)0) || __prefix == ((void*)0)) __result = (g_str_has_prefix ) (__str, __prefix); else { const size_t __str_len = strlen ( ((__str) + !(__str))); const size_t __prefix_len = strlen ((( __prefix) + !(__prefix))); if (__str_len >= __prefix_len) __result = memcmp (((__str) + !(__str)), ((__prefix) + !(__prefix)), __prefix_len ) == 0; } __result; }) : (g_str_has_prefix) (msg, gettext ("Password:" )) )) |
| 172 | { |
| 173 | did_we_ask_for_password = TRUE(!(0)); |
| 174 | } |
| 175 | break; |
| 176 | case GS_AUTH_MESSAGE_ERROR_MSG: |
| 177 | break; |
| 178 | case GS_AUTH_MESSAGE_TEXT_INFO: |
| 179 | break; |
| 180 | default: |
| 181 | g_assert_not_reached ()do { (void) 0; __builtin_unreachable (); } while (0); |
| 182 | } |
| 183 | |
| 184 | return ret; |
| 185 | } |
| 186 | |
| 187 | static gboolean |
| 188 | gs_auth_queued_message_handler (GsAuthMessageHandlerData *data) |
| 189 | { |
| 190 | gboolean res; |
| 191 | |
| 192 | if (gs_auth_get_verbose ()) |
| 193 | { |
| 194 | g_message ("Waiting for lock"); |
| 195 | } |
| 196 | |
| 197 | g_mutex_lock (&message_handler_mutex); |
| 198 | |
| 199 | if (gs_auth_get_verbose ()) |
| 200 | { |
| 201 | g_message ("Waiting for response"); |
| 202 | } |
| 203 | |
| 204 | res = data->closure->cb_func (data->style, |
| 205 | data->msg, |
| 206 | data->resp, |
| 207 | data->closure->cb_data); |
| 208 | |
| 209 | data->should_interrupt_stack = res == FALSE(0); |
| 210 | |
| 211 | g_cond_signal (&message_handled_condition); |
| 212 | g_mutex_unlock (&message_handler_mutex); |
| 213 | |
| 214 | if (gs_auth_get_verbose ()) |
| 215 | { |
| 216 | g_message ("Got response"); |
| 217 | } |
| 218 | |
| 219 | return FALSE(0); |
| 220 | } |
| 221 | |
| 222 | static gboolean |
| 223 | gs_auth_run_message_handler (struct pam_closure *c, |
| 224 | GSAuthMessageStyle style, |
| 225 | const char *msg, |
| 226 | char **resp) |
| 227 | { |
| 228 | GsAuthMessageHandlerData data; |
| 229 | |
| 230 | data.closure = c; |
| 231 | data.style = style; |
| 232 | data.msg = msg; |
| 233 | data.resp = resp; |
| 234 | data.should_interrupt_stack = TRUE(!(0)); |
| 235 | |
| 236 | g_mutex_lock (&message_handler_mutex); |
| 237 | |
| 238 | /* Queue the callback in the gui (the main) thread |
| 239 | */ |
| 240 | g_idle_add ((GSourceFunc) gs_auth_queued_message_handler, &data); |
| 241 | |
| 242 | if (gs_auth_get_verbose ()) |
| 243 | { |
| 244 | g_message ("Waiting for respose to message style %d: '%s'", style, msg); |
| 245 | } |
| 246 | |
| 247 | /* Wait for the response |
| 248 | */ |
| 249 | g_cond_wait (&message_handled_condition, |
| 250 | &message_handler_mutex); |
| 251 | g_mutex_unlock (&message_handler_mutex); |
| 252 | |
| 253 | if (gs_auth_get_verbose ()) |
| 254 | { |
| 255 | g_message ("Got respose to message style %d: interrupt:%d", style, data.should_interrupt_stack); |
| 256 | } |
| 257 | |
| 258 | return data.should_interrupt_stack == FALSE(0); |
| 259 | } |
| 260 | |
| 261 | static int |
| 262 | pam_conversation (int nmsgs, |
| 263 | const struct pam_message **msg, |
| 264 | struct pam_response **resp, |
| 265 | void *closure) |
| 266 | { |
| 267 | int replies = 0; |
| 268 | struct pam_response *reply = NULL((void*)0); |
| 269 | struct pam_closure *c = (struct pam_closure *) closure; |
| 270 | gboolean res; |
| 271 | int ret; |
| 272 | |
| 273 | reply = (struct pam_response *) calloc (nmsgs, sizeof (*reply)); |
| 274 | |
| 275 | if (reply == NULL((void*)0)) |
| 276 | { |
| 277 | return PAM_CONV_ERR19; |
| 278 | } |
| 279 | |
| 280 | res = TRUE(!(0)); |
Value stored to 'res' is never read | |
| 281 | ret = PAM_SUCCESS0; |
| 282 | |
| 283 | for (replies = 0; replies < nmsgs && ret == PAM_SUCCESS0; replies++) |
| 284 | { |
| 285 | GSAuthMessageStyle style; |
| 286 | char *utf8_msg; |
| 287 | |
| 288 | style = pam_style_to_gs_style (msg [replies]->msg_style); |
| 289 | |
| 290 | utf8_msg = g_locale_to_utf8 (msg [replies]->msg, |
| 291 | -1, |
| 292 | NULL((void*)0), |
| 293 | NULL((void*)0), |
| 294 | NULL((void*)0)); |
| 295 | |
| 296 | /* if we couldn't convert text from locale then |
| 297 | * assume utf-8 and hope for the best */ |
| 298 | if (utf8_msg == NULL((void*)0)) |
| 299 | { |
| 300 | char *p; |
| 301 | char *q; |
| 302 | |
| 303 | utf8_msg = g_strdup (msg [replies]->msg)g_strdup_inline (msg [replies]->msg); |
| 304 | |
| 305 | p = utf8_msg; |
| 306 | while (*p != '\0' && !g_utf8_validate ((const char *)p, -1, (const char **)&q)) |
| 307 | { |
| 308 | *q = '?'; |
| 309 | p = q + 1; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | /* handle message locally first */ |
| 314 | auth_message_handler (style, |
| 315 | utf8_msg, |
| 316 | &reply [replies].resp, |
| 317 | NULL((void*)0)); |
| 318 | |
| 319 | if (c->cb_func != NULL((void*)0)) |
| 320 | { |
| 321 | if (gs_auth_get_verbose ()) |
| 322 | { |
| 323 | g_message ("Handling message style %d: '%s'", style, utf8_msg); |
| 324 | } |
| 325 | |
| 326 | /* blocks until the gui responds |
| 327 | */ |
| 328 | res = gs_auth_run_message_handler (c, |
| 329 | style, |
| 330 | utf8_msg, |
| 331 | &reply [replies].resp); |
| 332 | |
| 333 | if (gs_auth_get_verbose ()) |
| 334 | { |
| 335 | g_message ("Msg handler returned %d", res); |
| 336 | } |
| 337 | |
| 338 | /* If the handler returns FALSE - interrupt the PAM stack */ |
| 339 | if (res) |
| 340 | { |
| 341 | reply [replies].resp_retcode = PAM_SUCCESS0; |
| 342 | } |
| 343 | else |
| 344 | { |
| 345 | int i; |
| 346 | for (i = 0; i <= replies; i++) |
| 347 | { |
| 348 | free (reply [i].resp); |
| 349 | } |
| 350 | free (reply); |
| 351 | reply = NULL((void*)0); |
| 352 | ret = PAM_CONV_ERR19; |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | g_free (utf8_msg); |
| 357 | } |
| 358 | |
| 359 | *resp = reply; |
| 360 | |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | static gboolean |
| 365 | close_pam_handle (int status) |
| 366 | { |
| 367 | |
| 368 | if (pam_handle != NULL((void*)0)) |
| 369 | { |
| 370 | int status2; |
| 371 | |
| 372 | status2 = pam_end (pam_handle, status); |
| 373 | pam_handle = NULL((void*)0); |
| 374 | |
| 375 | if (gs_auth_get_verbose ()) |
| 376 | { |
| 377 | g_message (" pam_end (...) ==> %d (%s)", |
| 378 | status2, |
| 379 | (status2 == PAM_SUCCESS0 ? "Success" : "Failure")); |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | return TRUE(!(0)); |
| 384 | } |
| 385 | |
| 386 | static gboolean |
| 387 | create_pam_handle (const char *username, |
| 388 | const char *display, |
| 389 | struct pam_conv *conv, |
| 390 | int *status_code) |
| 391 | { |
| 392 | int status; |
| 393 | const char *service = PAM_SERVICE_NAME"cafe-screensaver"; |
| 394 | char *disp; |
| 395 | gboolean ret; |
| 396 | |
| 397 | if (pam_handle != NULL((void*)0)) |
| 398 | { |
| 399 | g_warning ("create_pam_handle: Stale pam handle around, cleaning up"); |
| 400 | close_pam_handle (PAM_SUCCESS0); |
| 401 | } |
| 402 | |
| 403 | /* init things */ |
| 404 | pam_handle = NULL((void*)0); |
| 405 | status = -1; |
| 406 | disp = NULL((void*)0); |
| 407 | ret = TRUE(!(0)); |
| 408 | |
| 409 | /* Initialize a PAM session for the user */ |
| 410 | if ((status = pam_start (service, username, conv, &pam_handle)) != PAM_SUCCESS0) |
| 411 | { |
| 412 | pam_handle = NULL((void*)0); |
| 413 | g_warning (_("Unable to establish service %s: %s\n")gettext ("Unable to establish service %s: %s\n"), |
| 414 | service, |
| 415 | PAM_STRERROR (NULL, status)pam_strerror((((void*)0)), (status))); |
| 416 | |
| 417 | if (status_code != NULL((void*)0)) |
| 418 | { |
| 419 | *status_code = status; |
| 420 | } |
| 421 | |
| 422 | ret = FALSE(0); |
| 423 | goto out; |
| 424 | } |
| 425 | |
| 426 | if (gs_auth_get_verbose ()) |
| 427 | { |
| 428 | g_message ("pam_start (\"%s\", \"%s\", ...) ==> %d (%s)", |
| 429 | service, |
| 430 | username, |
| 431 | status, |
| 432 | PAM_STRERROR (pam_handle, status)pam_strerror((pam_handle), (status))); |
| 433 | } |
| 434 | |
| 435 | disp = g_strdup (display)g_strdup_inline (display); |
| 436 | if (disp == NULL((void*)0)) |
| 437 | { |
| 438 | disp = g_strdup (":0.0")g_strdup_inline (":0.0"); |
| 439 | } |
| 440 | |
| 441 | if ((status = pam_set_item (pam_handle, PAM_TTY3, disp)) != PAM_SUCCESS0) |
| 442 | { |
| 443 | g_warning (_("Can't set PAM_TTY=%s")gettext ("Can't set PAM_TTY=%s"), display); |
| 444 | |
| 445 | if (status_code != NULL((void*)0)) |
| 446 | { |
| 447 | *status_code = status; |
| 448 | } |
| 449 | |
| 450 | ret = FALSE(0); |
| 451 | goto out; |
| 452 | } |
| 453 | |
| 454 | ret = TRUE(!(0)); |
| 455 | g_cond_init (&message_handled_condition); |
| 456 | g_mutex_init (&message_handler_mutex); |
| 457 | |
| 458 | out: |
| 459 | if (status_code != NULL((void*)0)) |
| 460 | { |
| 461 | *status_code = status; |
| 462 | } |
| 463 | |
| 464 | g_free (disp); |
| 465 | |
| 466 | return ret; |
| 467 | } |
| 468 | |
| 469 | static void |
| 470 | set_pam_error (GError **error, |
| 471 | int status) |
| 472 | { |
| 473 | if (status == PAM_AUTH_ERR7 || status == PAM_USER_UNKNOWN10) |
| 474 | { |
| 475 | char *msg; |
| 476 | |
| 477 | if (did_we_ask_for_password) |
| 478 | { |
| 479 | msg = g_strdup (_("Incorrect password."))g_strdup_inline (gettext ("Incorrect password.")); |
| 480 | } |
| 481 | else |
| 482 | { |
| 483 | msg = g_strdup (_("Authentication failed."))g_strdup_inline (gettext ("Authentication failed.")); |
| 484 | } |
| 485 | |
| 486 | g_set_error (error, |
| 487 | GS_AUTH_ERRORgs_auth_error_quark (), |
| 488 | GS_AUTH_ERROR_AUTH_ERROR, |
| 489 | "%s", |
| 490 | msg); |
| 491 | g_free (msg); |
| 492 | } |
| 493 | else if (status == PAM_PERM_DENIED6) |
| 494 | { |
| 495 | g_set_error (error, |
| 496 | GS_AUTH_ERRORgs_auth_error_quark (), |
| 497 | GS_AUTH_ERROR_AUTH_DENIED, |
| 498 | "%s", |
| 499 | _("Not permitted to gain access at this time.")gettext ("Not permitted to gain access at this time.")); |
| 500 | } |
| 501 | else if (status == PAM_ACCT_EXPIRED13) |
| 502 | { |
| 503 | g_set_error (error, |
| 504 | GS_AUTH_ERRORgs_auth_error_quark (), |
| 505 | GS_AUTH_ERROR_AUTH_DENIED, |
| 506 | "%s", |
| 507 | _("No longer permitted to access the system.")gettext ("No longer permitted to access the system.")); |
| 508 | } |
| 509 | |
| 510 | } |
| 511 | |
| 512 | static int |
| 513 | gs_auth_thread_func (int auth_operation_fd) |
| 514 | { |
| 515 | static const int flags = 0; |
| 516 | int status; |
| 517 | int status2; |
| 518 | struct timespec timeout; |
| 519 | sigset_t set; |
| 520 | const void *p; |
| 521 | |
| 522 | timeout.tv_sec = 0; |
| 523 | timeout.tv_nsec = 1; |
| 524 | |
| 525 | set = block_sigchld (); |
| 526 | |
| 527 | status = pam_authenticate (pam_handle, flags); |
| 528 | |
| 529 | sigtimedwait (&set, NULL((void*)0), &timeout); |
| 530 | unblock_sigchld (); |
| 531 | |
| 532 | if (gs_auth_get_verbose ()) |
| 533 | { |
| 534 | g_message (" pam_authenticate (...) ==> %d (%s)", |
| 535 | status, |
| 536 | PAM_STRERROR (pam_handle, status)pam_strerror((pam_handle), (status))); |
| 537 | } |
| 538 | |
| 539 | if (status != PAM_SUCCESS0) |
| 540 | { |
| 541 | goto done; |
| 542 | } |
| 543 | |
| 544 | if ((status = pam_get_item (pam_handle, PAM_USER2, &p)) != PAM_SUCCESS0) |
| 545 | { |
| 546 | /* is not really an auth problem, but it will |
| 547 | pretty much look as such, it shouldn't really |
| 548 | happen */ |
| 549 | goto done; |
| 550 | } |
| 551 | |
| 552 | /* We don't actually care if the account modules fail or succeed, |
| 553 | * but we need to run them anyway because certain pam modules |
| 554 | * depend on side effects of the account modules getting run. |
| 555 | */ |
| 556 | status2 = pam_acct_mgmt (pam_handle, 0); |
| 557 | |
| 558 | if (gs_auth_get_verbose ()) |
| 559 | { |
| 560 | g_message ("pam_acct_mgmt (...) ==> %d (%s)\n", |
| 561 | status2, |
| 562 | PAM_STRERROR (pam_handle, status2)pam_strerror((pam_handle), (status2))); |
| 563 | } |
| 564 | |
| 565 | /* FIXME: should we handle these? */ |
| 566 | switch (status2) |
| 567 | { |
| 568 | case PAM_SUCCESS0: |
| 569 | break; |
| 570 | case PAM_NEW_AUTHTOK_REQD12: |
| 571 | break; |
| 572 | case PAM_AUTHINFO_UNAVAIL9: |
| 573 | break; |
| 574 | case PAM_ACCT_EXPIRED13: |
| 575 | break; |
| 576 | case PAM_PERM_DENIED6: |
| 577 | break; |
| 578 | default : |
| 579 | break; |
| 580 | } |
| 581 | |
| 582 | /* Each time we successfully authenticate, refresh credentials, |
| 583 | for Kerberos/AFS/DCE/etc. If this fails, just ignore that |
| 584 | failure and blunder along; it shouldn't matter. |
| 585 | |
| 586 | Note: this used to be PAM_REFRESH_CRED instead of |
| 587 | PAM_REINITIALIZE_CRED, but Jason Heiss <jheiss@ee.washington.edu> |
| 588 | says that the Linux PAM library ignores that one, and only refreshes |
| 589 | credentials when using PAM_REINITIALIZE_CRED. |
| 590 | */ |
| 591 | status2 = pam_setcred (pam_handle, PAM_REINITIALIZE_CRED0x0008U); |
| 592 | if (gs_auth_get_verbose ()) |
| 593 | { |
| 594 | g_message (" pam_setcred (...) ==> %d (%s)", |
| 595 | status2, |
| 596 | PAM_STRERROR (pam_handle, status2)pam_strerror((pam_handle), (status2))); |
| 597 | } |
| 598 | |
| 599 | done: |
| 600 | /* we're done, close the fd and wake up the main |
| 601 | * loop |
| 602 | */ |
| 603 | close (auth_operation_fd); |
| 604 | |
| 605 | return status; |
| 606 | } |
| 607 | |
| 608 | static gboolean |
| 609 | gs_auth_loop_quit (GIOChannel *source, |
| 610 | GIOCondition condition, |
| 611 | gboolean *thread_done) |
| 612 | { |
| 613 | *thread_done = TRUE(!(0)); |
| 614 | ctk_main_quit (); |
| 615 | return FALSE(0); |
| 616 | } |
| 617 | |
| 618 | static gboolean |
| 619 | gs_auth_pam_verify_user (pam_handle_t *handle, |
| 620 | int *status) |
| 621 | { |
| 622 | GThread *auth_thread; |
| 623 | GIOChannel *channel; |
| 624 | guint watch_id; |
| 625 | int auth_operation_fds[2]; |
| 626 | int auth_status; |
| 627 | gboolean thread_done; |
| 628 | |
| 629 | channel = NULL((void*)0); |
| 630 | watch_id = 0; |
| 631 | auth_status = PAM_AUTH_ERR7; |
| 632 | |
| 633 | /* This pipe gives us a set of fds we can hook into |
| 634 | * the event loop to be notified when our helper thread |
| 635 | * is ready to be reaped. |
| 636 | */ |
| 637 | if (pipe (auth_operation_fds) < 0) |
| 638 | { |
| 639 | goto out; |
| 640 | } |
| 641 | |
| 642 | if (fcntl (auth_operation_fds[0], F_SETFD2, FD_CLOEXEC1) < 0) |
| 643 | { |
| 644 | close (auth_operation_fds[0]); |
| 645 | close (auth_operation_fds[1]); |
| 646 | goto out; |
| 647 | } |
| 648 | |
| 649 | if (fcntl (auth_operation_fds[1], F_SETFD2, FD_CLOEXEC1) < 0) |
| 650 | { |
| 651 | close (auth_operation_fds[0]); |
| 652 | close (auth_operation_fds[1]); |
| 653 | goto out; |
| 654 | } |
| 655 | |
| 656 | channel = g_io_channel_unix_new (auth_operation_fds[0]); |
| 657 | |
| 658 | /* we use a recursive main loop to process ui events |
| 659 | * while we wait on a thread to handle the blocking parts |
| 660 | * of pam authentication. |
| 661 | */ |
| 662 | thread_done = FALSE(0); |
| 663 | watch_id = g_io_add_watch (channel, G_IO_ERR | G_IO_HUP, |
| 664 | (GIOFunc) gs_auth_loop_quit, &thread_done); |
| 665 | |
| 666 | auth_thread = g_thread_new ("auththread", |
| 667 | (GThreadFunc) gs_auth_thread_func, |
| 668 | GINT_TO_POINTER (auth_operation_fds[1])((gpointer) (glong) (auth_operation_fds[1]))); |
| 669 | |
| 670 | if (auth_thread == NULL((void*)0)) |
| 671 | { |
| 672 | goto out; |
| 673 | } |
| 674 | |
| 675 | ctk_main (); |
| 676 | |
| 677 | /* if the event loop was quit before the thread is done then we can't |
| 678 | * reap the thread without blocking on it finishing. The |
| 679 | * thread may not ever finish though if the pam module is blocking. |
| 680 | * |
| 681 | * The only time the event loop is going to stop when the thread isn't |
| 682 | * done, however, is if the dialog quits early (from, e.g., "cancel"), |
| 683 | * so we can just exit. An alternative option would be to switch to |
| 684 | * using pthreads directly and calling pthread_cancel. |
| 685 | */ |
| 686 | if (!thread_done) |
| 687 | { |
| 688 | raise (SIGTERM15); |
| 689 | } |
| 690 | |
| 691 | auth_status = GPOINTER_TO_INT (g_thread_join (auth_thread))((gint) (glong) (g_thread_join (auth_thread))); |
| 692 | |
| 693 | out: |
| 694 | if (watch_id != 0) |
| 695 | { |
| 696 | g_source_remove (watch_id); |
| 697 | watch_id = 0; |
| 698 | } |
| 699 | |
| 700 | if (channel != NULL((void*)0)) |
| 701 | { |
| 702 | g_io_channel_unref (channel); |
| 703 | } |
| 704 | |
| 705 | if (status) |
| 706 | { |
| 707 | *status = auth_status; |
| 708 | } |
| 709 | |
| 710 | return auth_status == PAM_SUCCESS0; |
| 711 | } |
| 712 | |
| 713 | gboolean |
| 714 | gs_auth_verify_user (const char *username, |
| 715 | const char *display, |
| 716 | GSAuthMessageFunc func, |
| 717 | gpointer data, |
| 718 | GError **error) |
| 719 | { |
| 720 | int status = -1; |
| 721 | struct pam_conv conv; |
| 722 | struct pam_closure c; |
| 723 | struct passwd *pwent; |
| 724 | |
| 725 | pwent = getpwnam (username); |
| 726 | if (pwent == NULL((void*)0)) |
| 727 | { |
| 728 | return FALSE(0); |
| 729 | } |
| 730 | |
| 731 | c.username = username; |
| 732 | c.cb_func = func; |
| 733 | c.cb_data = data; |
| 734 | |
| 735 | conv.conv = &pam_conversation; |
| 736 | conv.appdata_ptr = (void *) &c; |
| 737 | |
| 738 | /* Initialize PAM. */ |
| 739 | create_pam_handle (username, display, &conv, &status); |
| 740 | if (status != PAM_SUCCESS0) |
| 741 | { |
| 742 | goto done; |
| 743 | } |
| 744 | |
| 745 | pam_set_item (pam_handle, PAM_USER_PROMPT9, _("Username:")gettext ("Username:")); |
| 746 | |
| 747 | PAM_NO_DELAY(pam_handle)pam_fail_delay ((pam_handle), 1); |
| 748 | |
| 749 | did_we_ask_for_password = FALSE(0); |
| 750 | if (! gs_auth_pam_verify_user (pam_handle, &status)) |
| 751 | { |
| 752 | goto done; |
| 753 | } |
| 754 | |
| 755 | done: |
| 756 | if (status != PAM_SUCCESS0) |
| 757 | { |
| 758 | set_pam_error (error, status); |
| 759 | } |
| 760 | |
| 761 | close_pam_handle (status); |
| 762 | |
| 763 | return (status == PAM_SUCCESS0 ? TRUE(!(0)) : FALSE(0)); |
| 764 | } |
| 765 | |
| 766 | gboolean |
| 767 | gs_auth_init (void) |
| 768 | { |
| 769 | return TRUE(!(0)); |
| 770 | } |
| 771 | |
| 772 | gboolean |
| 773 | gs_auth_priv_init (void) |
| 774 | { |
| 775 | /* We have nothing to do at init-time. |
| 776 | However, we might as well do some error checking. |
| 777 | If "/etc/pam.d" exists and is a directory, but "/etc/pam.d/xlock" |
| 778 | does not exist, warn that PAM probably isn't going to work. |
| 779 | |
| 780 | This is a priv-init instead of a non-priv init in case the directory |
| 781 | is unreadable or something (don't know if that actually happens.) |
| 782 | */ |
| 783 | const char dir [] = "/etc/pam.d"; |
| 784 | const char file [] = "/etc/pam.d/" PAM_SERVICE_NAME"cafe-screensaver"; |
| 785 | const char file2 [] = "/etc/pam.conf"; |
| 786 | struct stat st; |
| 787 | |
| 788 | if (g_statstat (dir, &st) == 0 && st.st_mode & S_IFDIR0040000) |
| 789 | { |
| 790 | if (g_statstat (file, &st) != 0) |
| 791 | { |
| 792 | g_warning ("%s does not exist.\n" |
| 793 | "Authentication via PAM is unlikely to work.", |
| 794 | file); |
| 795 | } |
| 796 | } |
| 797 | else if (g_statstat (file2, &st) == 0) |
| 798 | { |
| 799 | FILE *f = g_fopenfopen (file2, "r"); |
| 800 | if (f) |
| 801 | { |
| 802 | gboolean ok = FALSE(0); |
| 803 | char buf[255]; |
| 804 | while (fgets (buf, sizeof(buf), f)) |
| 805 | { |
| 806 | if (strstr (buf, PAM_SERVICE_NAME"cafe-screensaver")) |
| 807 | { |
| 808 | ok = TRUE(!(0)); |
| 809 | break; |
| 810 | } |
| 811 | } |
| 812 | |
| 813 | fclose (f); |
| 814 | if (!ok) |
| 815 | { |
| 816 | g_warning ("%s does not list the `%s' service.\n" |
| 817 | "Authentication via PAM is unlikely to work.", |
| 818 | file2, PAM_SERVICE_NAME"cafe-screensaver"); |
| 819 | } |
| 820 | } |
| 821 | /* else warn about file2 existing but being unreadable? */ |
| 822 | } |
| 823 | else |
| 824 | { |
| 825 | g_warning ("Neither %s nor %s exist.\n" |
| 826 | "Authentication via PAM is unlikely to work.", |
| 827 | file2, file); |
| 828 | } |
| 829 | |
| 830 | /* Return true anyway, just in case. */ |
| 831 | return TRUE(!(0)); |
| 832 | } |