Branch data Line data Source code
1 : : /* SPDX-License-Identifier: LGPL-2.1+ */
2 : :
3 : : #include <endian.h>
4 : : #include <errno.h>
5 : : #include <fcntl.h>
6 : : #include <pwd.h>
7 : : #include <security/_pam_macros.h>
8 : : #include <security/pam_ext.h>
9 : : #include <security/pam_misc.h>
10 : : #include <security/pam_modules.h>
11 : : #include <security/pam_modutil.h>
12 : : #include <sys/file.h>
13 : : #include <sys/stat.h>
14 : : #include <sys/types.h>
15 : : #include <unistd.h>
16 : :
17 : : #include "alloc-util.h"
18 : : #include "audit-util.h"
19 : : #include "bus-common-errors.h"
20 : : #include "bus-error.h"
21 : : #include "bus-internal.h"
22 : : #include "bus-util.h"
23 : : #include "cgroup-util.h"
24 : : #include "errno-util.h"
25 : : #include "fd-util.h"
26 : : #include "fileio.h"
27 : : #include "format-util.h"
28 : : #include "hostname-util.h"
29 : : #include "login-util.h"
30 : : #include "macro.h"
31 : : #include "parse-util.h"
32 : : #include "path-util.h"
33 : : #include "process-util.h"
34 : : #include "socket-util.h"
35 : : #include "stdio-util.h"
36 : : #include "strv.h"
37 : : #include "terminal-util.h"
38 : :
39 : 0 : static int parse_argv(
40 : : pam_handle_t *handle,
41 : : int argc, const char **argv,
42 : : const char **class,
43 : : const char **type,
44 : : const char **desktop,
45 : : bool *debug) {
46 : :
47 : : unsigned i;
48 : :
49 [ # # ]: 0 : assert(argc >= 0);
50 [ # # # # ]: 0 : assert(argc == 0 || argv);
51 : :
52 [ # # ]: 0 : for (i = 0; i < (unsigned) argc; i++) {
53 [ # # ]: 0 : if (startswith(argv[i], "class=")) {
54 [ # # ]: 0 : if (class)
55 : 0 : *class = argv[i] + 6;
56 : :
57 [ # # ]: 0 : } else if (startswith(argv[i], "type=")) {
58 [ # # ]: 0 : if (type)
59 : 0 : *type = argv[i] + 5;
60 : :
61 [ # # ]: 0 : } else if (startswith(argv[i], "desktop=")) {
62 [ # # ]: 0 : if (desktop)
63 : 0 : *desktop = argv[i] + 8;
64 : :
65 [ # # ]: 0 : } else if (streq(argv[i], "debug")) {
66 [ # # ]: 0 : if (debug)
67 : 0 : *debug = true;
68 : :
69 [ # # ]: 0 : } else if (startswith(argv[i], "debug=")) {
70 : : int k;
71 : :
72 : 0 : k = parse_boolean(argv[i] + 6);
73 [ # # ]: 0 : if (k < 0)
74 : 0 : pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring.");
75 [ # # ]: 0 : else if (debug)
76 : 0 : *debug = k;
77 : :
78 : : } else
79 : 0 : pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]);
80 : : }
81 : :
82 : 0 : return 0;
83 : : }
84 : :
85 : 0 : static int get_user_data(
86 : : pam_handle_t *handle,
87 : : const char **ret_username,
88 : : struct passwd **ret_pw) {
89 : :
90 : 0 : const char *username = NULL;
91 : 0 : struct passwd *pw = NULL;
92 : : int r;
93 : :
94 [ # # ]: 0 : assert(handle);
95 [ # # ]: 0 : assert(ret_username);
96 [ # # ]: 0 : assert(ret_pw);
97 : :
98 : 0 : r = pam_get_user(handle, &username, NULL);
99 [ # # ]: 0 : if (r != PAM_SUCCESS) {
100 : 0 : pam_syslog(handle, LOG_ERR, "Failed to get user name.");
101 : 0 : return r;
102 : : }
103 : :
104 [ # # ]: 0 : if (isempty(username)) {
105 : 0 : pam_syslog(handle, LOG_ERR, "User name not valid.");
106 : 0 : return PAM_AUTH_ERR;
107 : : }
108 : :
109 : 0 : pw = pam_modutil_getpwnam(handle, username);
110 [ # # ]: 0 : if (!pw) {
111 : 0 : pam_syslog(handle, LOG_ERR, "Failed to get user data.");
112 : 0 : return PAM_USER_UNKNOWN;
113 : : }
114 : :
115 : 0 : *ret_pw = pw;
116 : 0 : *ret_username = username;
117 : :
118 : 0 : return PAM_SUCCESS;
119 : : }
120 : :
121 : 0 : static bool display_is_local(const char *display) {
122 [ # # ]: 0 : assert(display);
123 : :
124 : : return
125 : 0 : display[0] == ':' &&
126 [ # # # # ]: 0 : display[1] >= '0' &&
127 [ # # ]: 0 : display[1] <= '9';
128 : : }
129 : :
130 : 0 : static int socket_from_display(const char *display, char **path) {
131 : : size_t k;
132 : : char *f, *c;
133 : :
134 [ # # ]: 0 : assert(display);
135 [ # # ]: 0 : assert(path);
136 : :
137 [ # # ]: 0 : if (!display_is_local(display))
138 : 0 : return -EINVAL;
139 : :
140 : 0 : k = strspn(display+1, "0123456789");
141 : :
142 : 0 : f = new(char, STRLEN("/tmp/.X11-unix/X") + k + 1);
143 [ # # ]: 0 : if (!f)
144 : 0 : return -ENOMEM;
145 : :
146 : 0 : c = stpcpy(f, "/tmp/.X11-unix/X");
147 : 0 : memcpy(c, display+1, k);
148 : 0 : c[k] = 0;
149 : :
150 : 0 : *path = f;
151 : :
152 : 0 : return 0;
153 : : }
154 : :
155 : 0 : static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) {
156 : 0 : union sockaddr_union sa = {};
157 : 0 : _cleanup_free_ char *p = NULL, *tty = NULL;
158 : 0 : _cleanup_close_ int fd = -1;
159 : : struct ucred ucred;
160 : : int v, r, salen;
161 : :
162 [ # # ]: 0 : assert(display);
163 [ # # ]: 0 : assert(vtnr);
164 : :
165 : : /* We deduce the X11 socket from the display name, then use
166 : : * SO_PEERCRED to determine the X11 server process, ask for
167 : : * the controlling tty of that and if it's a VC then we know
168 : : * the seat and the virtual terminal. Sounds ugly, is only
169 : : * semi-ugly. */
170 : :
171 : 0 : r = socket_from_display(display, &p);
172 [ # # ]: 0 : if (r < 0)
173 : 0 : return r;
174 : 0 : salen = sockaddr_un_set_path(&sa.un, p);
175 [ # # ]: 0 : if (salen < 0)
176 : 0 : return salen;
177 : :
178 : 0 : fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
179 [ # # ]: 0 : if (fd < 0)
180 : 0 : return -errno;
181 : :
182 [ # # ]: 0 : if (connect(fd, &sa.sa, salen) < 0)
183 : 0 : return -errno;
184 : :
185 : 0 : r = getpeercred(fd, &ucred);
186 [ # # ]: 0 : if (r < 0)
187 : 0 : return r;
188 : :
189 : 0 : r = get_ctty(ucred.pid, NULL, &tty);
190 [ # # ]: 0 : if (r < 0)
191 : 0 : return r;
192 : :
193 : 0 : v = vtnr_from_tty(tty);
194 [ # # ]: 0 : if (v < 0)
195 : 0 : return v;
196 [ # # ]: 0 : else if (v == 0)
197 : 0 : return -ENOENT;
198 : :
199 [ # # ]: 0 : if (seat)
200 : 0 : *seat = "seat0";
201 : 0 : *vtnr = (uint32_t) v;
202 : :
203 : 0 : return 0;
204 : : }
205 : :
206 : 0 : static int export_legacy_dbus_address(
207 : : pam_handle_t *handle,
208 : : uid_t uid,
209 : : const char *runtime) {
210 : :
211 : : const char *s;
212 : 0 : _cleanup_free_ char *t = NULL;
213 : 0 : int r = PAM_BUF_ERR;
214 : :
215 : : /* We need to export $DBUS_SESSION_BUS_ADDRESS because various applications will not connect
216 : : * correctly to the bus without it. This setting matches what dbus.socket does for the user
217 : : * session using 'systemctl --user set-environment'. We want to have the same configuration
218 : : * in processes started from the PAM session.
219 : : *
220 : : * The setting of the address is guarded by the access() check because it is also possible to compile
221 : : * dbus without --enable-user-session, in which case this socket is not used, and
222 : : * $DBUS_SESSION_BUS_ADDRESS should not be set. An alternative approach would to not do the access()
223 : : * check here, and let applications try on their own, by using "unix:path=%s/bus;autolaunch:". But we
224 : : * expect the socket to be present by the time we do this check, so we can just as well check once
225 : : * here. */
226 : :
227 [ # # # # : 0 : s = strjoina(runtime, "/bus");
# # # # #
# # # ]
228 [ # # ]: 0 : if (access(s, F_OK) < 0)
229 : 0 : return PAM_SUCCESS;
230 : :
231 [ # # ]: 0 : if (asprintf(&t, DEFAULT_USER_BUS_ADDRESS_FMT, runtime) < 0)
232 : 0 : goto error;
233 : :
234 : 0 : r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", t, 0);
235 [ # # ]: 0 : if (r != PAM_SUCCESS)
236 : 0 : goto error;
237 : :
238 : 0 : return PAM_SUCCESS;
239 : :
240 : 0 : error:
241 : 0 : pam_syslog(handle, LOG_ERR, "Failed to set bus variable.");
242 : 0 : return r;
243 : : }
244 : :
245 : 0 : static int append_session_memory_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) {
246 : : uint64_t val;
247 : : int r;
248 : :
249 [ # # ]: 0 : if (isempty(limit))
250 : 0 : return 0;
251 : :
252 [ # # ]: 0 : if (streq(limit, "infinity")) {
253 : 0 : r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", (uint64_t)-1);
254 [ # # ]: 0 : if (r < 0) {
255 : 0 : pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r));
256 : 0 : return r;
257 : : }
258 : : } else {
259 : 0 : r = parse_permille(limit);
260 [ # # ]: 0 : if (r >= 0) {
261 : 0 : r = sd_bus_message_append(m, "(sv)", "MemoryMaxScale", "u", (uint32_t) (((uint64_t) r * UINT32_MAX) / 1000U));
262 [ # # ]: 0 : if (r < 0) {
263 : 0 : pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r));
264 : 0 : return r;
265 : : }
266 : : } else {
267 : 0 : r = parse_size(limit, 1024, &val);
268 [ # # ]: 0 : if (r >= 0) {
269 : 0 : r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", val);
270 [ # # ]: 0 : if (r < 0) {
271 : 0 : pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r));
272 : 0 : return r;
273 : : }
274 : : } else
275 : 0 : pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.memory_max: %s, ignoring.", limit);
276 : : }
277 : : }
278 : :
279 : 0 : return 0;
280 : : }
281 : :
282 : 0 : static int append_session_tasks_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) {
283 : : uint64_t val;
284 : : int r;
285 : :
286 : : /* No need to parse "infinity" here, it will be set unconditionally later in manager_start_scope() */
287 [ # # # # ]: 0 : if (isempty(limit) || streq(limit, "infinity"))
288 : 0 : return 0;
289 : :
290 : 0 : r = safe_atou64(limit, &val);
291 [ # # ]: 0 : if (r >= 0) {
292 : 0 : r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", val);
293 [ # # ]: 0 : if (r < 0) {
294 : 0 : pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r));
295 : 0 : return r;
296 : : }
297 : : } else
298 : 0 : pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.tasks_max: %s, ignoring.", limit);
299 : :
300 : 0 : return 0;
301 : : }
302 : :
303 : 0 : static int append_session_cg_weight(pam_handle_t *handle, sd_bus_message *m, const char *limit, const char *field) {
304 : : uint64_t val;
305 : : int r;
306 : :
307 [ # # ]: 0 : if (isempty(limit))
308 : 0 : return 0;
309 : :
310 : 0 : r = cg_weight_parse(limit, &val);
311 [ # # ]: 0 : if (r >= 0) {
312 : 0 : r = sd_bus_message_append(m, "(sv)", field, "t", val);
313 [ # # ]: 0 : if (r < 0) {
314 : 0 : pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r));
315 : 0 : return r;
316 : : }
317 [ # # ]: 0 : } else if (streq(field, "CPUWeight"))
318 : 0 : pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.cpu_weight: %s, ignoring.", limit);
319 : : else
320 : 0 : pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.io_weight: %s, ignoring.", limit);
321 : :
322 : 0 : return 0;
323 : : }
324 : :
325 : 0 : static const char* getenv_harder(pam_handle_t *handle, const char *key, const char *fallback) {
326 : : const char *v;
327 : :
328 [ # # ]: 0 : assert(handle);
329 [ # # ]: 0 : assert(key);
330 : :
331 : : /* Looks for an environment variable, preferably in the environment block associated with the
332 : : * specified PAM handle, falling back to the process' block instead. Why check both? Because we want
333 : : * to permit configuration of session properties from unit files that invoke PAM services, so that
334 : : * PAM services don't have to be reworked to set systemd-specific properties, but these properties
335 : : * can still be set from the unit file Environment= block. */
336 : :
337 : 0 : v = pam_getenv(handle, key);
338 [ # # ]: 0 : if (!isempty(v))
339 : 0 : return v;
340 : :
341 : : /* We use secure_getenv() here, since we might get loaded into su/sudo, which are SUID. Ideally
342 : : * they'd clean up the environment before invoking foreign code (such as PAM modules), but alas they
343 : : * currently don't (to be precise, they clean up the environment they pass to their children, but
344 : : * not their own environ[]). */
345 : 0 : v = secure_getenv(key);
346 [ # # ]: 0 : if (!isempty(v))
347 : 0 : return v;
348 : :
349 : 0 : return fallback;
350 : : }
351 : :
352 : 0 : static int update_environment(pam_handle_t *handle, const char *key, const char *value) {
353 : : int r;
354 : :
355 [ # # ]: 0 : assert(handle);
356 [ # # ]: 0 : assert(key);
357 : :
358 : : /* Updates the environment, but only if there's actually a value set. Also, log about errors */
359 : :
360 [ # # ]: 0 : if (isempty(value))
361 : 0 : return PAM_SUCCESS;
362 : :
363 : 0 : r = pam_misc_setenv(handle, key, value, 0);
364 [ # # ]: 0 : if (r != PAM_SUCCESS)
365 : 0 : pam_syslog(handle, LOG_ERR, "Failed to set environment variable %s.", key);
366 : :
367 : 0 : return r;
368 : : }
369 : :
370 : 0 : static bool validate_runtime_directory(pam_handle_t *handle, const char *path, uid_t uid) {
371 : : struct stat st;
372 : :
373 [ # # ]: 0 : assert(path);
374 : :
375 : : /* Just some extra paranoia: let's not set $XDG_RUNTIME_DIR if the directory we'd set it to isn't actually set
376 : : * up properly for us. */
377 : :
378 [ # # ]: 0 : if (lstat(path, &st) < 0) {
379 : 0 : pam_syslog(handle, LOG_ERR, "Failed to stat() runtime directory '%s': %s", path, strerror_safe(errno));
380 : 0 : goto fail;
381 : : }
382 : :
383 [ # # ]: 0 : if (!S_ISDIR(st.st_mode)) {
384 : 0 : pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not actually a directory.", path);
385 : 0 : goto fail;
386 : : }
387 : :
388 [ # # ]: 0 : if (st.st_uid != uid) {
389 : 0 : pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not owned by UID " UID_FMT ", as it should.", path, uid);
390 : 0 : goto fail;
391 : : }
392 : :
393 : 0 : return true;
394 : :
395 : 0 : fail:
396 : 0 : pam_syslog(handle, LOG_WARNING, "Not setting $XDG_RUNTIME_DIR, as the directory is not in order.");
397 : 0 : return false;
398 : : }
399 : :
400 : : _public_ PAM_EXTERN int pam_sm_open_session(
401 : : pam_handle_t *handle,
402 : : int flags,
403 : : int argc, const char **argv) {
404 : :
405 : 0 : _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
406 : 0 : _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL;
407 : : const char
408 : : *username, *id, *object_path, *runtime_path,
409 : 0 : *service = NULL,
410 : 0 : *tty = NULL, *display = NULL,
411 : 0 : *remote_user = NULL, *remote_host = NULL,
412 : 0 : *seat = NULL,
413 : 0 : *type = NULL, *class = NULL,
414 : 0 : *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL, *desktop_pam = NULL,
415 : 0 : *memory_max = NULL, *tasks_max = NULL, *cpu_weight = NULL, *io_weight = NULL;
416 : 0 : _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
417 : 0 : int session_fd = -1, existing, r;
418 : 0 : bool debug = false, remote;
419 : : struct passwd *pw;
420 : 0 : uint32_t vtnr = 0;
421 : : uid_t original_uid;
422 : :
423 [ # # ]: 0 : assert(handle);
424 : :
425 : : /* Make this a NOP on non-logind systems */
426 [ # # ]: 0 : if (!logind_running())
427 : 0 : return PAM_SUCCESS;
428 : :
429 [ # # ]: 0 : if (parse_argv(handle,
430 : : argc, argv,
431 : : &class_pam,
432 : : &type_pam,
433 : : &desktop_pam,
434 : : &debug) < 0)
435 : 0 : return PAM_SESSION_ERR;
436 : :
437 [ # # ]: 0 : if (debug)
438 : 0 : pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing");
439 : :
440 : 0 : r = get_user_data(handle, &username, &pw);
441 [ # # ]: 0 : if (r != PAM_SUCCESS) {
442 : 0 : pam_syslog(handle, LOG_ERR, "Failed to get user data.");
443 : 0 : return r;
444 : : }
445 : :
446 : : /* Make sure we don't enter a loop by talking to
447 : : * systemd-logind when it is actually waiting for the
448 : : * background to finish start-up. If the service is
449 : : * "systemd-user" we simply set XDG_RUNTIME_DIR and
450 : : * leave. */
451 : :
452 : 0 : pam_get_item(handle, PAM_SERVICE, (const void**) &service);
453 [ # # ]: 0 : if (streq_ptr(service, "systemd-user")) {
454 : : char rt[STRLEN("/run/user/") + DECIMAL_STR_MAX(uid_t)];
455 : :
456 [ # # ]: 0 : xsprintf(rt, "/run/user/"UID_FMT, pw->pw_uid);
457 [ # # ]: 0 : if (validate_runtime_directory(handle, rt, pw->pw_uid)) {
458 : 0 : r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0);
459 [ # # ]: 0 : if (r != PAM_SUCCESS) {
460 : 0 : pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
461 : 0 : return r;
462 : : }
463 : : }
464 : :
465 : 0 : r = export_legacy_dbus_address(handle, pw->pw_uid, rt);
466 [ # # ]: 0 : if (r != PAM_SUCCESS)
467 : 0 : return r;
468 : :
469 : 0 : return PAM_SUCCESS;
470 : : }
471 : :
472 : : /* Otherwise, we ask logind to create a session for us */
473 : :
474 : 0 : pam_get_item(handle, PAM_XDISPLAY, (const void**) &display);
475 : 0 : pam_get_item(handle, PAM_TTY, (const void**) &tty);
476 : 0 : pam_get_item(handle, PAM_RUSER, (const void**) &remote_user);
477 : 0 : pam_get_item(handle, PAM_RHOST, (const void**) &remote_host);
478 : :
479 : 0 : seat = getenv_harder(handle, "XDG_SEAT", NULL);
480 : 0 : cvtnr = getenv_harder(handle, "XDG_VTNR", NULL);
481 : 0 : type = getenv_harder(handle, "XDG_SESSION_TYPE", type_pam);
482 : 0 : class = getenv_harder(handle, "XDG_SESSION_CLASS", class_pam);
483 : 0 : desktop = getenv_harder(handle, "XDG_SESSION_DESKTOP", desktop_pam);
484 : :
485 : 0 : tty = strempty(tty);
486 : :
487 [ # # ]: 0 : if (strchr(tty, ':')) {
488 : : /* A tty with a colon is usually an X11 display, placed there to show up in utmp. We rearrange things
489 : : * and don't pretend that an X display was a tty. */
490 [ # # ]: 0 : if (isempty(display))
491 : 0 : display = tty;
492 : 0 : tty = NULL;
493 : :
494 [ # # ]: 0 : } else if (streq(tty, "cron")) {
495 : : /* cron is setting PAM_TTY to "cron" for some reason (the commit carries no information why, but
496 : : * probably because it wants to set it to something as pam_time/pam_access/… require PAM_TTY to be set
497 : : * (as they otherwise even try to update it!) — but cron doesn't actually allocate a TTY for its forked
498 : : * off processes.) */
499 : 0 : type = "unspecified";
500 : 0 : class = "background";
501 : 0 : tty = NULL;
502 : :
503 [ # # ]: 0 : } else if (streq(tty, "ssh")) {
504 : : /* ssh has been setting PAM_TTY to "ssh" (for the same reason as cron does this, see above. For further
505 : : * details look for "PAM_TTY_KLUDGE" in the openssh sources). */
506 : 0 : type ="tty";
507 : 0 : class = "user";
508 : 0 : tty = NULL; /* This one is particularly sad, as this means that ssh sessions — even though usually
509 : : * associated with a pty — won't be tracked by their tty in logind. This is because ssh
510 : : * does the PAM session registration early for new connections, and registers a pty only
511 : : * much later (this is because it doesn't know yet if it needs one at all, as whether to
512 : : * register a pty or not is negotiated much later in the protocol). */
513 : :
514 : : } else
515 : : /* Chop off leading /dev prefix that some clients specify, but others do not. */
516 : 0 : tty = skip_dev_prefix(tty);
517 : :
518 : : /* If this fails vtnr will be 0, that's intended */
519 [ # # ]: 0 : if (!isempty(cvtnr))
520 : 0 : (void) safe_atou32(cvtnr, &vtnr);
521 : :
522 [ # # # # ]: 0 : if (!isempty(display) && !vtnr) {
523 [ # # ]: 0 : if (isempty(seat))
524 : 0 : (void) get_seat_from_display(display, &seat, &vtnr);
525 [ # # ]: 0 : else if (streq(seat, "seat0"))
526 : 0 : (void) get_seat_from_display(display, NULL, &vtnr);
527 : : }
528 : :
529 [ # # # # : 0 : if (seat && !streq(seat, "seat0") && vtnr != 0) {
# # ]
530 [ # # ]: 0 : if (debug)
531 : 0 : pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat);
532 : 0 : vtnr = 0;
533 : : }
534 : :
535 [ # # ]: 0 : if (isempty(type))
536 [ # # ]: 0 : type = !isempty(display) ? "x11" :
537 [ # # ]: 0 : !isempty(tty) ? "tty" : "unspecified";
538 : :
539 [ # # ]: 0 : if (isempty(class))
540 [ # # ]: 0 : class = streq(type, "unspecified") ? "background" : "user";
541 : :
542 [ # # # # ]: 0 : remote = !isempty(remote_host) && !is_localhost(remote_host);
543 : :
544 : 0 : (void) pam_get_data(handle, "systemd.memory_max", (const void **)&memory_max);
545 : 0 : (void) pam_get_data(handle, "systemd.tasks_max", (const void **)&tasks_max);
546 : 0 : (void) pam_get_data(handle, "systemd.cpu_weight", (const void **)&cpu_weight);
547 : 0 : (void) pam_get_data(handle, "systemd.io_weight", (const void **)&io_weight);
548 : :
549 : : /* Talk to logind over the message bus */
550 : :
551 : 0 : r = sd_bus_open_system(&bus);
552 [ # # ]: 0 : if (r < 0) {
553 : 0 : pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror_safe(r));
554 : 0 : return PAM_SESSION_ERR;
555 : : }
556 : :
557 [ # # ]: 0 : if (debug) {
558 : 0 : pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: "
559 : : "uid="UID_FMT" pid="PID_FMT" service=%s type=%s class=%s desktop=%s seat=%s vtnr=%"PRIu32" tty=%s display=%s remote=%s remote_user=%s remote_host=%s",
560 : 0 : pw->pw_uid, getpid_cached(),
561 : : strempty(service),
562 : : type, class, strempty(desktop),
563 : : strempty(seat), vtnr, strempty(tty), strempty(display),
564 : : yes_no(remote), strempty(remote_user), strempty(remote_host));
565 : 0 : pam_syslog(handle, LOG_DEBUG, "Session limits: "
566 : : "memory_max=%s tasks_max=%s cpu_weight=%s io_weight=%s",
567 : : strna(memory_max), strna(tasks_max), strna(cpu_weight), strna(io_weight));
568 : : }
569 : :
570 : 0 : r = sd_bus_message_new_method_call(
571 : : bus,
572 : : &m,
573 : : "org.freedesktop.login1",
574 : : "/org/freedesktop/login1",
575 : : "org.freedesktop.login1.Manager",
576 : : "CreateSession");
577 [ # # ]: 0 : if (r < 0) {
578 : 0 : pam_syslog(handle, LOG_ERR, "Failed to create CreateSession method call: %s", strerror_safe(r));
579 : 0 : return PAM_SESSION_ERR;
580 : : }
581 : :
582 : 0 : r = sd_bus_message_append(m, "uusssssussbss",
583 : 0 : (uint32_t) pw->pw_uid,
584 : : 0,
585 : : service,
586 : : type,
587 : : class,
588 : : desktop,
589 : : seat,
590 : : vtnr,
591 : : tty,
592 : : display,
593 : : remote,
594 : : remote_user,
595 : : remote_host);
596 [ # # ]: 0 : if (r < 0) {
597 : 0 : pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r));
598 : 0 : return PAM_SESSION_ERR;
599 : : }
600 : :
601 : 0 : r = sd_bus_message_open_container(m, 'a', "(sv)");
602 [ # # ]: 0 : if (r < 0) {
603 : 0 : pam_syslog(handle, LOG_ERR, "Failed to open message container: %s", strerror_safe(r));
604 : 0 : return PAM_SYSTEM_ERR;
605 : : }
606 : :
607 : 0 : r = append_session_memory_max(handle, m, memory_max);
608 [ # # ]: 0 : if (r < 0)
609 : 0 : return PAM_SESSION_ERR;
610 : :
611 : 0 : r = append_session_tasks_max(handle, m, tasks_max);
612 [ # # ]: 0 : if (r < 0)
613 : 0 : return PAM_SESSION_ERR;
614 : :
615 : 0 : r = append_session_cg_weight(handle, m, cpu_weight, "CPUWeight");
616 [ # # ]: 0 : if (r < 0)
617 : 0 : return PAM_SESSION_ERR;
618 : :
619 : 0 : r = append_session_cg_weight(handle, m, io_weight, "IOWeight");
620 [ # # ]: 0 : if (r < 0)
621 : 0 : return PAM_SESSION_ERR;
622 : :
623 : 0 : r = sd_bus_message_close_container(m);
624 [ # # ]: 0 : if (r < 0) {
625 : 0 : pam_syslog(handle, LOG_ERR, "Failed to close message container: %s", strerror_safe(r));
626 : 0 : return PAM_SYSTEM_ERR;
627 : : }
628 : :
629 : 0 : r = sd_bus_call(bus, m, 0, &error, &reply);
630 [ # # ]: 0 : if (r < 0) {
631 [ # # ]: 0 : if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) {
632 [ # # ]: 0 : if (debug)
633 : 0 : pam_syslog(handle, LOG_DEBUG, "Not creating session: %s", bus_error_message(&error, r));
634 : 0 : return PAM_SUCCESS;
635 : : } else {
636 : 0 : pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r));
637 : 0 : return PAM_SYSTEM_ERR;
638 : : }
639 : : }
640 : :
641 : 0 : r = sd_bus_message_read(reply,
642 : : "soshusub",
643 : : &id,
644 : : &object_path,
645 : : &runtime_path,
646 : : &session_fd,
647 : : &original_uid,
648 : : &seat,
649 : : &vtnr,
650 : : &existing);
651 [ # # ]: 0 : if (r < 0) {
652 : 0 : pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", strerror_safe(r));
653 : 0 : return PAM_SESSION_ERR;
654 : : }
655 : :
656 [ # # ]: 0 : if (debug)
657 : 0 : pam_syslog(handle, LOG_DEBUG, "Reply from logind: "
658 : : "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u",
659 : : id, object_path, runtime_path, session_fd, seat, vtnr, original_uid);
660 : :
661 : 0 : r = update_environment(handle, "XDG_SESSION_ID", id);
662 [ # # ]: 0 : if (r != PAM_SUCCESS)
663 : 0 : return r;
664 : :
665 [ # # ]: 0 : if (original_uid == pw->pw_uid) {
666 : : /* Don't set $XDG_RUNTIME_DIR if the user we now
667 : : * authenticated for does not match the original user
668 : : * of the session. We do this in order not to result
669 : : * in privileged apps clobbering the runtime directory
670 : : * unnecessarily. */
671 : :
672 [ # # ]: 0 : if (validate_runtime_directory(handle, runtime_path, pw->pw_uid)) {
673 : 0 : r = update_environment(handle, "XDG_RUNTIME_DIR", runtime_path);
674 [ # # ]: 0 : if (r != PAM_SUCCESS)
675 : 0 : return r;
676 : : }
677 : :
678 : 0 : r = export_legacy_dbus_address(handle, pw->pw_uid, runtime_path);
679 [ # # ]: 0 : if (r != PAM_SUCCESS)
680 : 0 : return r;
681 : : }
682 : :
683 : : /* Most likely we got the session/type/class from environment variables, but might have gotten the data
684 : : * somewhere else (for example PAM module parameters). Let's now update the environment variables, so that this
685 : : * data is inherited into the session processes, and programs can rely on them to be initialized. */
686 : :
687 : 0 : r = update_environment(handle, "XDG_SESSION_TYPE", type);
688 [ # # ]: 0 : if (r != PAM_SUCCESS)
689 : 0 : return r;
690 : :
691 : 0 : r = update_environment(handle, "XDG_SESSION_CLASS", class);
692 [ # # ]: 0 : if (r != PAM_SUCCESS)
693 : 0 : return r;
694 : :
695 : 0 : r = update_environment(handle, "XDG_SESSION_DESKTOP", desktop);
696 [ # # ]: 0 : if (r != PAM_SUCCESS)
697 : 0 : return r;
698 : :
699 : 0 : r = update_environment(handle, "XDG_SEAT", seat);
700 [ # # ]: 0 : if (r != PAM_SUCCESS)
701 : 0 : return r;
702 : :
703 [ # # ]: 0 : if (vtnr > 0) {
704 : : char buf[DECIMAL_STR_MAX(vtnr)];
705 : 0 : sprintf(buf, "%u", vtnr);
706 : :
707 : 0 : r = update_environment(handle, "XDG_VTNR", buf);
708 [ # # ]: 0 : if (r != PAM_SUCCESS)
709 : 0 : return r;
710 : : }
711 : :
712 [ # # ]: 0 : r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL);
713 [ # # ]: 0 : if (r != PAM_SUCCESS) {
714 : 0 : pam_syslog(handle, LOG_ERR, "Failed to install existing flag.");
715 : 0 : return r;
716 : : }
717 : :
718 [ # # ]: 0 : if (session_fd >= 0) {
719 : 0 : session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3);
720 [ # # ]: 0 : if (session_fd < 0) {
721 : 0 : pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m");
722 : 0 : return PAM_SESSION_ERR;
723 : : }
724 : :
725 : 0 : r = pam_set_data(handle, "systemd.session-fd", FD_TO_PTR(session_fd), NULL);
726 [ # # ]: 0 : if (r != PAM_SUCCESS) {
727 : 0 : pam_syslog(handle, LOG_ERR, "Failed to install session fd.");
728 : 0 : safe_close(session_fd);
729 : 0 : return r;
730 : : }
731 : : }
732 : :
733 : 0 : return PAM_SUCCESS;
734 : : }
735 : :
736 : : _public_ PAM_EXTERN int pam_sm_close_session(
737 : : pam_handle_t *handle,
738 : : int flags,
739 : : int argc, const char **argv) {
740 : :
741 : 0 : _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
742 : 0 : _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
743 : 0 : const void *existing = NULL;
744 : : const char *id;
745 : : int r;
746 : :
747 [ # # ]: 0 : assert(handle);
748 : :
749 : : /* Only release session if it wasn't pre-existing when we
750 : : * tried to create it */
751 : 0 : (void) pam_get_data(handle, "systemd.existing", &existing);
752 : :
753 : 0 : id = pam_getenv(handle, "XDG_SESSION_ID");
754 [ # # # # ]: 0 : if (id && !existing) {
755 : :
756 : : /* Before we go and close the FIFO we need to tell
757 : : * logind that this is a clean session shutdown, so
758 : : * that it doesn't just go and slaughter us
759 : : * immediately after closing the fd */
760 : :
761 : 0 : r = sd_bus_open_system(&bus);
762 [ # # ]: 0 : if (r < 0) {
763 : 0 : pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror_safe(r));
764 : 0 : return PAM_SESSION_ERR;
765 : : }
766 : :
767 : 0 : r = sd_bus_call_method(bus,
768 : : "org.freedesktop.login1",
769 : : "/org/freedesktop/login1",
770 : : "org.freedesktop.login1.Manager",
771 : : "ReleaseSession",
772 : : &error,
773 : : NULL,
774 : : "s",
775 : : id);
776 [ # # ]: 0 : if (r < 0) {
777 : 0 : pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r));
778 : 0 : return PAM_SESSION_ERR;
779 : : }
780 : : }
781 : :
782 : : /* Note that we are knowingly leaking the FIFO fd here. This
783 : : * way, logind can watch us die. If we closed it here it would
784 : : * not have any clue when that is completed. Given that one
785 : : * cannot really have multiple PAM sessions open from the same
786 : : * process this means we will leak one FD at max. */
787 : :
788 : 0 : return PAM_SUCCESS;
789 : : }
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