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3c0ef626 | 1 | /* |
2 | * Copyright (c) 2000 Andre Lucas. All rights reserved. | |
3 | * Portions copyright (c) 1998 Todd C. Miller | |
4 | * Portions copyright (c) 1996 Jason Downs | |
5 | * Portions copyright (c) 1996 Theo de Raadt | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
3c0ef626 | 15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
996d5e62 | 28 | /* |
29 | * The btmp logging code is derived from login.c from util-linux and is under | |
30 | * the the following license: | |
31 | * | |
32 | * Copyright (c) 1980, 1987, 1988 The Regents of the University of California. | |
33 | * All rights reserved. | |
34 | * | |
35 | * Redistribution and use in source and binary forms are permitted | |
36 | * provided that the above copyright notice and this paragraph are | |
37 | * duplicated in all such forms and that any documentation, | |
38 | * advertising materials, and other materials related to such | |
39 | * distribution and use acknowledge that the software was developed | |
40 | * by the University of California, Berkeley. The name of the | |
41 | * University may not be used to endorse or promote products derived | |
42 | * from this software without specific prior written permission. | |
43 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
44 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
45 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
46 | */ | |
47 | ||
48 | ||
3c0ef626 | 49 | /** |
50 | ** loginrec.c: platform-independent login recording and lastlog retrieval | |
51 | **/ | |
52 | ||
53 | /* | |
996d5e62 | 54 | * The new login code explained |
55 | * ============================ | |
56 | * | |
57 | * This code attempts to provide a common interface to login recording | |
58 | * (utmp and friends) and last login time retrieval. | |
59 | * | |
60 | * Its primary means of achieving this is to use 'struct logininfo', a | |
61 | * union of all the useful fields in the various different types of | |
62 | * system login record structures one finds on UNIX variants. | |
63 | * | |
64 | * We depend on autoconf to define which recording methods are to be | |
65 | * used, and which fields are contained in the relevant data structures | |
66 | * on the local system. Many C preprocessor symbols affect which code | |
67 | * gets compiled here. | |
68 | * | |
69 | * The code is designed to make it easy to modify a particular | |
70 | * recording method, without affecting other methods nor requiring so | |
71 | * many nested conditional compilation blocks as were commonplace in | |
72 | * the old code. | |
73 | * | |
74 | * For login recording, we try to use the local system's libraries as | |
75 | * these are clearly most likely to work correctly. For utmp systems | |
76 | * this usually means login() and logout() or setutent() etc., probably | |
77 | * in libutil, along with logwtmp() etc. On these systems, we fall back | |
78 | * to writing the files directly if we have to, though this method | |
79 | * requires very thorough testing so we do not corrupt local auditing | |
80 | * information. These files and their access methods are very system | |
81 | * specific indeed. | |
82 | * | |
83 | * For utmpx systems, the corresponding library functions are | |
84 | * setutxent() etc. To the author's knowledge, all utmpx systems have | |
85 | * these library functions and so no direct write is attempted. If such | |
86 | * a system exists and needs support, direct analogues of the [uw]tmp | |
87 | * code should suffice. | |
88 | * | |
89 | * Retrieving the time of last login ('lastlog') is in some ways even | |
90 | * more problemmatic than login recording. Some systems provide a | |
91 | * simple table of all users which we seek based on uid and retrieve a | |
92 | * relatively standard structure. Others record the same information in | |
93 | * a directory with a separate file, and others don't record the | |
94 | * information separately at all. For systems in the latter category, | |
95 | * we look backwards in the wtmp or wtmpx file for the last login entry | |
96 | * for our user. Naturally this is slower and on busy systems could | |
97 | * incur a significant performance penalty. | |
98 | * | |
99 | * Calling the new code | |
100 | * -------------------- | |
101 | * | |
102 | * In OpenSSH all login recording and retrieval is performed in | |
103 | * login.c. Here you'll find working examples. Also, in the logintest.c | |
104 | * program there are more examples. | |
105 | * | |
106 | * Internal handler calling method | |
107 | * ------------------------------- | |
108 | * | |
109 | * When a call is made to login_login() or login_logout(), both | |
110 | * routines set a struct logininfo flag defining which action (log in, | |
111 | * or log out) is to be taken. They both then call login_write(), which | |
112 | * calls whichever of the many structure-specific handlers autoconf | |
113 | * selects for the local system. | |
114 | * | |
115 | * The handlers themselves handle system data structure specifics. Both | |
116 | * struct utmp and struct utmpx have utility functions (see | |
117 | * construct_utmp*()) to try to make it simpler to add extra systems | |
118 | * that introduce new features to either structure. | |
119 | * | |
120 | * While it may seem terribly wasteful to replicate so much similar | |
121 | * code for each method, experience has shown that maintaining code to | |
122 | * write both struct utmp and utmpx in one function, whilst maintaining | |
123 | * support for all systems whether they have library support or not, is | |
124 | * a difficult and time-consuming task. | |
125 | * | |
126 | * Lastlog support proceeds similarly. Functions login_get_lastlog() | |
127 | * (and its OpenSSH-tuned friend login_get_lastlog_time()) call | |
128 | * getlast_entry(), which tries one of three methods to find the last | |
129 | * login time. It uses local system lastlog support if it can, | |
130 | * otherwise it tries wtmp or wtmpx before giving up and returning 0, | |
131 | * meaning "tilt". | |
132 | * | |
133 | * Maintenance | |
134 | * ----------- | |
135 | * | |
136 | * In many cases it's possible to tweak autoconf to select the correct | |
137 | * methods for a particular platform, either by improving the detection | |
138 | * code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE | |
139 | * symbols for the platform. | |
140 | * | |
141 | * Use logintest to check which symbols are defined before modifying | |
142 | * configure.ac and loginrec.c. (You have to build logintest yourself | |
143 | * with 'make logintest' as it's not built by default.) | |
144 | * | |
145 | * Otherwise, patches to the specific method(s) are very helpful! | |
146 | */ | |
3c0ef626 | 147 | |
148 | #include "includes.h" | |
149 | ||
150 | #include "ssh.h" | |
151 | #include "xmalloc.h" | |
152 | #include "loginrec.h" | |
153 | #include "log.h" | |
154 | #include "atomicio.h" | |
996d5e62 | 155 | #include "packet.h" |
156 | #include "canohost.h" | |
157 | #include "auth.h" | |
158 | #include "buffer.h" | |
3c0ef626 | 159 | |
160 | #ifdef HAVE_UTIL_H | |
996d5e62 | 161 | # include <util.h> |
3c0ef626 | 162 | #endif |
163 | ||
164 | #ifdef HAVE_LIBUTIL_H | |
996d5e62 | 165 | # include <libutil.h> |
3c0ef626 | 166 | #endif |
167 | ||
996d5e62 | 168 | RCSID("$Id$"); |
169 | ||
3c0ef626 | 170 | /** |
171 | ** prototypes for helper functions in this file | |
172 | **/ | |
173 | ||
174 | #if HAVE_UTMP_H | |
175 | void set_utmp_time(struct logininfo *li, struct utmp *ut); | |
176 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
177 | #endif | |
178 | ||
179 | #ifdef HAVE_UTMPX_H | |
180 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); | |
181 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
182 | #endif | |
183 | ||
184 | int utmp_write_entry(struct logininfo *li); | |
185 | int utmpx_write_entry(struct logininfo *li); | |
186 | int wtmp_write_entry(struct logininfo *li); | |
187 | int wtmpx_write_entry(struct logininfo *li); | |
188 | int lastlog_write_entry(struct logininfo *li); | |
189 | int syslogin_write_entry(struct logininfo *li); | |
190 | ||
191 | int getlast_entry(struct logininfo *li); | |
192 | int lastlog_get_entry(struct logininfo *li); | |
193 | int wtmp_get_entry(struct logininfo *li); | |
194 | int wtmpx_get_entry(struct logininfo *li); | |
195 | ||
996d5e62 | 196 | extern Buffer loginmsg; |
197 | ||
3c0ef626 | 198 | /* pick the shortest string */ |
996d5e62 | 199 | #define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2)) |
3c0ef626 | 200 | |
201 | /** | |
202 | ** platform-independent login functions | |
203 | **/ | |
204 | ||
996d5e62 | 205 | /* |
206 | * login_login(struct logininfo *) - Record a login | |
3c0ef626 | 207 | * |
208 | * Call with a pointer to a struct logininfo initialised with | |
209 | * login_init_entry() or login_alloc_entry() | |
210 | * | |
211 | * Returns: | |
212 | * >0 if successful | |
213 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
214 | */ | |
215 | int | |
996d5e62 | 216 | login_login(struct logininfo *li) |
3c0ef626 | 217 | { |
218 | li->type = LTYPE_LOGIN; | |
996d5e62 | 219 | return (login_write(li)); |
3c0ef626 | 220 | } |
221 | ||
222 | ||
996d5e62 | 223 | /* |
224 | * login_logout(struct logininfo *) - Record a logout | |
3c0ef626 | 225 | * |
226 | * Call as with login_login() | |
227 | * | |
228 | * Returns: | |
229 | * >0 if successful | |
230 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
231 | */ | |
232 | int | |
233 | login_logout(struct logininfo *li) | |
234 | { | |
235 | li->type = LTYPE_LOGOUT; | |
996d5e62 | 236 | return (login_write(li)); |
3c0ef626 | 237 | } |
238 | ||
996d5e62 | 239 | /* |
240 | * login_get_lastlog_time(int) - Retrieve the last login time | |
3c0ef626 | 241 | * |
242 | * Retrieve the last login time for the given uid. Will try to use the | |
243 | * system lastlog facilities if they are available, but will fall back | |
244 | * to looking in wtmp/wtmpx if necessary | |
245 | * | |
246 | * Returns: | |
247 | * 0 on failure, or if user has never logged in | |
248 | * Time in seconds from the epoch if successful | |
249 | * | |
250 | * Useful preprocessor symbols: | |
251 | * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog | |
252 | * info | |
253 | * USE_LASTLOG: If set, indicates the presence of system lastlog | |
254 | * facilities. If this and DISABLE_LASTLOG are not set, | |
255 | * try to retrieve lastlog information from wtmp/wtmpx. | |
256 | */ | |
257 | unsigned int | |
258 | login_get_lastlog_time(const int uid) | |
259 | { | |
260 | struct logininfo li; | |
261 | ||
262 | if (login_get_lastlog(&li, uid)) | |
996d5e62 | 263 | return (li.tv_sec); |
3c0ef626 | 264 | else |
996d5e62 | 265 | return (0); |
3c0ef626 | 266 | } |
267 | ||
996d5e62 | 268 | /* |
269 | * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry | |
3c0ef626 | 270 | * |
271 | * Retrieve a logininfo structure populated (only partially) with | |
272 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
273 | * system lastlog information exists. | |
274 | * | |
275 | * Note this routine must be given a pre-allocated logininfo. | |
276 | * | |
277 | * Returns: | |
278 | * >0: A pointer to your struct logininfo if successful | |
279 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
3c0ef626 | 280 | */ |
281 | struct logininfo * | |
282 | login_get_lastlog(struct logininfo *li, const int uid) | |
283 | { | |
284 | struct passwd *pw; | |
285 | ||
286 | memset(li, '\0', sizeof(*li)); | |
287 | li->uid = uid; | |
288 | ||
289 | /* | |
290 | * If we don't have a 'real' lastlog, we need the username to | |
291 | * reliably search wtmp(x) for the last login (see | |
292 | * wtmp_get_entry().) | |
293 | */ | |
294 | pw = getpwuid(uid); | |
295 | if (pw == NULL) | |
996d5e62 | 296 | fatal("%s: Cannot find account for uid %i", __func__, uid); |
3c0ef626 | 297 | |
298 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the | |
996d5e62 | 299 | * username (XXX - so check for trunc!) */ |
3c0ef626 | 300 | strlcpy(li->username, pw->pw_name, sizeof(li->username)); |
301 | ||
302 | if (getlast_entry(li)) | |
996d5e62 | 303 | return (li); |
3c0ef626 | 304 | else |
996d5e62 | 305 | return (NULL); |
3c0ef626 | 306 | } |
307 | ||
308 | ||
996d5e62 | 309 | /* |
310 | * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise | |
3c0ef626 | 311 | * a logininfo structure |
312 | * | |
313 | * This function creates a new struct logininfo, a data structure | |
314 | * meant to carry the information required to portably record login info. | |
315 | * | |
316 | * Returns a pointer to a newly created struct logininfo. If memory | |
317 | * allocation fails, the program halts. | |
318 | */ | |
319 | struct | |
320 | logininfo *login_alloc_entry(int pid, const char *username, | |
996d5e62 | 321 | const char *hostname, const char *line) |
3c0ef626 | 322 | { |
323 | struct logininfo *newli; | |
324 | ||
996d5e62 | 325 | newli = xmalloc(sizeof(*newli)); |
326 | login_init_entry(newli, pid, username, hostname, line); | |
327 | return (newli); | |
3c0ef626 | 328 | } |
329 | ||
330 | ||
331 | /* login_free_entry(struct logininfo *) - free struct memory */ | |
332 | void | |
333 | login_free_entry(struct logininfo *li) | |
334 | { | |
335 | xfree(li); | |
336 | } | |
337 | ||
338 | ||
339 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) | |
340 | * - initialise a struct logininfo | |
341 | * | |
342 | * Populates a new struct logininfo, a data structure meant to carry | |
343 | * the information required to portably record login info. | |
344 | * | |
345 | * Returns: 1 | |
346 | */ | |
347 | int | |
348 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
996d5e62 | 349 | const char *hostname, const char *line) |
3c0ef626 | 350 | { |
351 | struct passwd *pw; | |
352 | ||
353 | memset(li, 0, sizeof(*li)); | |
354 | ||
355 | li->pid = pid; | |
356 | ||
357 | /* set the line information */ | |
358 | if (line) | |
359 | line_fullname(li->line, line, sizeof(li->line)); | |
360 | ||
361 | if (username) { | |
362 | strlcpy(li->username, username, sizeof(li->username)); | |
363 | pw = getpwnam(li->username); | |
996d5e62 | 364 | if (pw == NULL) { |
665a873d | 365 | fatal("%s: Cannot find user \"%s\"", __func__, |
996d5e62 | 366 | li->username); |
367 | } | |
3c0ef626 | 368 | li->uid = pw->pw_uid; |
369 | } | |
370 | ||
371 | if (hostname) | |
372 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
373 | ||
996d5e62 | 374 | return (1); |
3c0ef626 | 375 | } |
376 | ||
665a873d | 377 | /* |
996d5e62 | 378 | * login_set_current_time(struct logininfo *) - set the current time |
3c0ef626 | 379 | * |
380 | * Set the current time in a logininfo structure. This function is | |
381 | * meant to eliminate the need to deal with system dependencies for | |
382 | * time handling. | |
383 | */ | |
384 | void | |
385 | login_set_current_time(struct logininfo *li) | |
386 | { | |
387 | struct timeval tv; | |
388 | ||
389 | gettimeofday(&tv, NULL); | |
390 | ||
391 | li->tv_sec = tv.tv_sec; | |
392 | li->tv_usec = tv.tv_usec; | |
393 | } | |
394 | ||
395 | /* copy a sockaddr_* into our logininfo */ | |
396 | void | |
397 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, | |
996d5e62 | 398 | const unsigned int sa_size) |
3c0ef626 | 399 | { |
400 | unsigned int bufsize = sa_size; | |
401 | ||
402 | /* make sure we don't overrun our union */ | |
403 | if (sizeof(li->hostaddr) < sa_size) | |
404 | bufsize = sizeof(li->hostaddr); | |
405 | ||
996d5e62 | 406 | memcpy(&li->hostaddr.sa, sa, bufsize); |
3c0ef626 | 407 | } |
408 | ||
409 | ||
410 | /** | |
411 | ** login_write: Call low-level recording functions based on autoconf | |
412 | ** results | |
413 | **/ | |
414 | int | |
996d5e62 | 415 | login_write(struct logininfo *li) |
3c0ef626 | 416 | { |
417 | #ifndef HAVE_CYGWIN | |
996d5e62 | 418 | if (geteuid() != 0) { |
419 | logit("Attempt to write login records by non-root user (aborting)"); | |
420 | return (1); | |
3c0ef626 | 421 | } |
422 | #endif | |
423 | ||
424 | /* set the timestamp */ | |
425 | login_set_current_time(li); | |
426 | #ifdef USE_LOGIN | |
427 | syslogin_write_entry(li); | |
428 | #endif | |
429 | #ifdef USE_LASTLOG | |
996d5e62 | 430 | if (li->type == LTYPE_LOGIN) |
3c0ef626 | 431 | lastlog_write_entry(li); |
3c0ef626 | 432 | #endif |
433 | #ifdef USE_UTMP | |
434 | utmp_write_entry(li); | |
435 | #endif | |
436 | #ifdef USE_WTMP | |
437 | wtmp_write_entry(li); | |
438 | #endif | |
439 | #ifdef USE_UTMPX | |
440 | utmpx_write_entry(li); | |
441 | #endif | |
442 | #ifdef USE_WTMPX | |
443 | wtmpx_write_entry(li); | |
c9f39d2c | 444 | #endif |
445 | #ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN | |
665a873d | 446 | if (li->type == LTYPE_LOGIN && |
447 | !sys_auth_record_login(li->username,li->hostname,li->line, | |
448 | &loginmsg)) | |
c9f39d2c | 449 | logit("Writing login record failed for %s", li->username); |
3c0ef626 | 450 | #endif |
996d5e62 | 451 | #ifdef SSH_AUDIT_EVENTS |
452 | if (li->type == LTYPE_LOGIN) | |
453 | audit_session_open(li->line); | |
454 | else if (li->type == LTYPE_LOGOUT) | |
455 | audit_session_close(li->line); | |
456 | #endif | |
457 | return (0); | |
3c0ef626 | 458 | } |
459 | ||
460 | #ifdef LOGIN_NEEDS_UTMPX | |
461 | int | |
462 | login_utmp_only(struct logininfo *li) | |
463 | { | |
cdd66111 | 464 | li->type = LTYPE_LOGIN; |
3c0ef626 | 465 | login_set_current_time(li); |
466 | # ifdef USE_UTMP | |
467 | utmp_write_entry(li); | |
468 | # endif | |
469 | # ifdef USE_WTMP | |
470 | wtmp_write_entry(li); | |
471 | # endif | |
472 | # ifdef USE_UTMPX | |
473 | utmpx_write_entry(li); | |
474 | # endif | |
475 | # ifdef USE_WTMPX | |
476 | wtmpx_write_entry(li); | |
477 | # endif | |
996d5e62 | 478 | return (0); |
3c0ef626 | 479 | } |
480 | #endif | |
481 | ||
482 | /** | |
483 | ** getlast_entry: Call low-level functions to retrieve the last login | |
484 | ** time. | |
485 | **/ | |
486 | ||
487 | /* take the uid in li and return the last login time */ | |
488 | int | |
489 | getlast_entry(struct logininfo *li) | |
490 | { | |
491 | #ifdef USE_LASTLOG | |
492 | return(lastlog_get_entry(li)); | |
493 | #else /* !USE_LASTLOG */ | |
494 | ||
996d5e62 | 495 | #if defined(DISABLE_LASTLOG) |
3c0ef626 | 496 | /* On some systems we shouldn't even try to obtain last login |
497 | * time, e.g. AIX */ | |
996d5e62 | 498 | return (0); |
499 | # elif defined(USE_WTMP) && \ | |
500 | (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) | |
3c0ef626 | 501 | /* retrieve last login time from utmp */ |
502 | return (wtmp_get_entry(li)); | |
996d5e62 | 503 | # elif defined(USE_WTMPX) && \ |
504 | (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) | |
3c0ef626 | 505 | /* If wtmp isn't available, try wtmpx */ |
3c0ef626 | 506 | return (wtmpx_get_entry(li)); |
996d5e62 | 507 | # else |
3c0ef626 | 508 | /* Give up: No means of retrieving last login time */ |
996d5e62 | 509 | return (0); |
3c0ef626 | 510 | # endif /* DISABLE_LASTLOG */ |
511 | #endif /* USE_LASTLOG */ | |
512 | } | |
513 | ||
514 | ||
515 | ||
516 | /* | |
517 | * 'line' string utility functions | |
518 | * | |
519 | * These functions process the 'line' string into one of three forms: | |
520 | * | |
521 | * 1. The full filename (including '/dev') | |
522 | * 2. The stripped name (excluding '/dev') | |
523 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 | |
524 | * /dev/pts/1 -> ts/1 ) | |
525 | * | |
526 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
527 | * attempting to remove it. Typically both addition and removal is | |
528 | * performed by one application - say, sshd - so as long as the choice | |
529 | * uniquely identifies a terminal it's ok. | |
530 | */ | |
531 | ||
532 | ||
996d5e62 | 533 | /* |
534 | * line_fullname(): add the leading '/dev/' if it doesn't exist make | |
535 | * sure dst has enough space, if not just copy src (ugh) | |
536 | */ | |
3c0ef626 | 537 | char * |
665a873d | 538 | line_fullname(char *dst, const char *src, u_int dstsize) |
3c0ef626 | 539 | { |
540 | memset(dst, '\0', dstsize); | |
996d5e62 | 541 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) |
3c0ef626 | 542 | strlcpy(dst, src, dstsize); |
996d5e62 | 543 | else { |
3c0ef626 | 544 | strlcpy(dst, "/dev/", dstsize); |
545 | strlcat(dst, src, dstsize); | |
546 | } | |
996d5e62 | 547 | return (dst); |
3c0ef626 | 548 | } |
549 | ||
550 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ | |
551 | char * | |
552 | line_stripname(char *dst, const char *src, int dstsize) | |
553 | { | |
554 | memset(dst, '\0', dstsize); | |
555 | if (strncmp(src, "/dev/", 5) == 0) | |
556 | strlcpy(dst, src + 5, dstsize); | |
557 | else | |
558 | strlcpy(dst, src, dstsize); | |
996d5e62 | 559 | return (dst); |
3c0ef626 | 560 | } |
561 | ||
665a873d | 562 | /* |
996d5e62 | 563 | * line_abbrevname(): Return the abbreviated (usually four-character) |
3c0ef626 | 564 | * form of the line (Just use the last <dstsize> characters of the |
565 | * full name.) | |
566 | * | |
567 | * NOTE: use strncpy because we do NOT necessarily want zero | |
996d5e62 | 568 | * termination |
569 | */ | |
3c0ef626 | 570 | char * |
571 | line_abbrevname(char *dst, const char *src, int dstsize) | |
572 | { | |
573 | size_t len; | |
574 | ||
575 | memset(dst, '\0', dstsize); | |
576 | ||
577 | /* Always skip prefix if present */ | |
578 | if (strncmp(src, "/dev/", 5) == 0) | |
579 | src += 5; | |
580 | ||
700318f3 | 581 | #ifdef WITH_ABBREV_NO_TTY |
582 | if (strncmp(src, "tty", 3) == 0) | |
583 | src += 3; | |
584 | #endif | |
585 | ||
3c0ef626 | 586 | len = strlen(src); |
587 | ||
588 | if (len > 0) { | |
589 | if (((int)len - dstsize) > 0) | |
590 | src += ((int)len - dstsize); | |
591 | ||
592 | /* note: _don't_ change this to strlcpy */ | |
593 | strncpy(dst, src, (size_t)dstsize); | |
594 | } | |
595 | ||
996d5e62 | 596 | return (dst); |
3c0ef626 | 597 | } |
598 | ||
599 | /** | |
600 | ** utmp utility functions | |
601 | ** | |
602 | ** These functions manipulate struct utmp, taking system differences | |
603 | ** into account. | |
604 | **/ | |
605 | ||
606 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
607 | ||
608 | /* build the utmp structure */ | |
609 | void | |
610 | set_utmp_time(struct logininfo *li, struct utmp *ut) | |
611 | { | |
996d5e62 | 612 | # if defined(HAVE_TV_IN_UTMP) |
3c0ef626 | 613 | ut->ut_tv.tv_sec = li->tv_sec; |
614 | ut->ut_tv.tv_usec = li->tv_usec; | |
996d5e62 | 615 | # elif defined(HAVE_TIME_IN_UTMP) |
3c0ef626 | 616 | ut->ut_time = li->tv_sec; |
3c0ef626 | 617 | # endif |
618 | } | |
619 | ||
620 | void | |
621 | construct_utmp(struct logininfo *li, | |
622 | struct utmp *ut) | |
623 | { | |
6a9b3198 | 624 | # ifdef HAVE_ADDR_V6_IN_UTMP |
625 | struct sockaddr_in6 *sa6; | |
996d5e62 | 626 | # endif |
627 | ||
3c0ef626 | 628 | memset(ut, '\0', sizeof(*ut)); |
629 | ||
630 | /* First fill out fields used for both logins and logouts */ | |
631 | ||
632 | # ifdef HAVE_ID_IN_UTMP | |
633 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); | |
634 | # endif | |
635 | ||
636 | # ifdef HAVE_TYPE_IN_UTMP | |
637 | /* This is done here to keep utmp constants out of struct logininfo */ | |
638 | switch (li->type) { | |
639 | case LTYPE_LOGIN: | |
640 | ut->ut_type = USER_PROCESS; | |
41b2f314 | 641 | #ifdef _UNICOS |
3c0ef626 | 642 | cray_set_tmpdir(ut); |
643 | #endif | |
644 | break; | |
645 | case LTYPE_LOGOUT: | |
646 | ut->ut_type = DEAD_PROCESS; | |
41b2f314 | 647 | #ifdef _UNICOS |
3c0ef626 | 648 | cray_retain_utmp(ut, li->pid); |
649 | #endif | |
650 | break; | |
651 | } | |
652 | # endif | |
653 | set_utmp_time(li, ut); | |
654 | ||
655 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); | |
656 | ||
657 | # ifdef HAVE_PID_IN_UTMP | |
658 | ut->ut_pid = li->pid; | |
659 | # endif | |
660 | ||
661 | /* If we're logging out, leave all other fields blank */ | |
662 | if (li->type == LTYPE_LOGOUT) | |
996d5e62 | 663 | return; |
3c0ef626 | 664 | |
665 | /* | |
666 | * These fields are only used when logging in, and are blank | |
667 | * for logouts. | |
668 | */ | |
669 | ||
670 | /* Use strncpy because we don't necessarily want null termination */ | |
996d5e62 | 671 | strncpy(ut->ut_name, li->username, |
672 | MIN_SIZEOF(ut->ut_name, li->username)); | |
3c0ef626 | 673 | # ifdef HAVE_HOST_IN_UTMP |
996d5e62 | 674 | strncpy(ut->ut_host, li->hostname, |
675 | MIN_SIZEOF(ut->ut_host, li->hostname)); | |
3c0ef626 | 676 | # endif |
677 | # ifdef HAVE_ADDR_IN_UTMP | |
678 | /* this is just a 32-bit IP address */ | |
679 | if (li->hostaddr.sa.sa_family == AF_INET) | |
680 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
681 | # endif | |
6a9b3198 | 682 | # ifdef HAVE_ADDR_V6_IN_UTMP |
683 | /* this is just a 128-bit IPv6 address */ | |
684 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
685 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
686 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
687 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
688 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
689 | ut->ut_addr_v6[1] = 0; | |
690 | ut->ut_addr_v6[2] = 0; | |
691 | ut->ut_addr_v6[3] = 0; | |
692 | } | |
693 | } | |
694 | # endif | |
3c0ef626 | 695 | } |
696 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ | |
697 | ||
698 | /** | |
699 | ** utmpx utility functions | |
700 | ** | |
701 | ** These functions manipulate struct utmpx, accounting for system | |
702 | ** variations. | |
703 | **/ | |
704 | ||
705 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
706 | /* build the utmpx structure */ | |
707 | void | |
708 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) | |
709 | { | |
996d5e62 | 710 | # if defined(HAVE_TV_IN_UTMPX) |
3c0ef626 | 711 | utx->ut_tv.tv_sec = li->tv_sec; |
712 | utx->ut_tv.tv_usec = li->tv_usec; | |
996d5e62 | 713 | # elif defined(HAVE_TIME_IN_UTMPX) |
3c0ef626 | 714 | utx->ut_time = li->tv_sec; |
996d5e62 | 715 | # endif |
3c0ef626 | 716 | } |
717 | ||
718 | void | |
719 | construct_utmpx(struct logininfo *li, struct utmpx *utx) | |
720 | { | |
6a9b3198 | 721 | # ifdef HAVE_ADDR_V6_IN_UTMP |
722 | struct sockaddr_in6 *sa6; | |
723 | # endif | |
3c0ef626 | 724 | memset(utx, '\0', sizeof(*utx)); |
996d5e62 | 725 | |
3c0ef626 | 726 | # ifdef HAVE_ID_IN_UTMPX |
727 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); | |
728 | # endif | |
729 | ||
730 | /* this is done here to keep utmp constants out of loginrec.h */ | |
731 | switch (li->type) { | |
732 | case LTYPE_LOGIN: | |
733 | utx->ut_type = USER_PROCESS; | |
734 | break; | |
735 | case LTYPE_LOGOUT: | |
736 | utx->ut_type = DEAD_PROCESS; | |
737 | break; | |
738 | } | |
739 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); | |
740 | set_utmpx_time(li, utx); | |
741 | utx->ut_pid = li->pid; | |
996d5e62 | 742 | |
e9a17296 | 743 | /* strncpy(): Don't necessarily want null termination */ |
996d5e62 | 744 | strncpy(utx->ut_name, li->username, |
745 | MIN_SIZEOF(utx->ut_name, li->username)); | |
3c0ef626 | 746 | |
747 | if (li->type == LTYPE_LOGOUT) | |
748 | return; | |
749 | ||
750 | /* | |
751 | * These fields are only used when logging in, and are blank | |
752 | * for logouts. | |
753 | */ | |
754 | ||
3c0ef626 | 755 | # ifdef HAVE_HOST_IN_UTMPX |
996d5e62 | 756 | strncpy(utx->ut_host, li->hostname, |
757 | MIN_SIZEOF(utx->ut_host, li->hostname)); | |
3c0ef626 | 758 | # endif |
759 | # ifdef HAVE_ADDR_IN_UTMPX | |
760 | /* this is just a 32-bit IP address */ | |
761 | if (li->hostaddr.sa.sa_family == AF_INET) | |
762 | utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
763 | # endif | |
6a9b3198 | 764 | # ifdef HAVE_ADDR_V6_IN_UTMP |
765 | /* this is just a 128-bit IPv6 address */ | |
766 | if (li->hostaddr.sa.sa_family == AF_INET6) { | |
767 | sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); | |
768 | memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); | |
769 | if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { | |
770 | ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; | |
771 | ut->ut_addr_v6[1] = 0; | |
772 | ut->ut_addr_v6[2] = 0; | |
773 | ut->ut_addr_v6[3] = 0; | |
774 | } | |
775 | } | |
776 | # endif | |
3c0ef626 | 777 | # ifdef HAVE_SYSLEN_IN_UTMPX |
778 | /* ut_syslen is the length of the utx_host string */ | |
779 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
780 | # endif | |
781 | } | |
782 | #endif /* USE_UTMPX || USE_WTMPX */ | |
783 | ||
784 | /** | |
785 | ** Low-level utmp functions | |
786 | **/ | |
787 | ||
788 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
789 | #ifdef USE_UTMP | |
790 | ||
791 | /* if we can, use pututline() etc. */ | |
792 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ | |
793 | defined(HAVE_PUTUTLINE) | |
794 | # define UTMP_USE_LIBRARY | |
795 | # endif | |
796 | ||
797 | ||
798 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
799 | # ifdef UTMP_USE_LIBRARY | |
800 | static int | |
801 | utmp_write_library(struct logininfo *li, struct utmp *ut) | |
802 | { | |
803 | setutent(); | |
804 | pututline(ut); | |
3c0ef626 | 805 | # ifdef HAVE_ENDUTENT |
806 | endutent(); | |
807 | # endif | |
996d5e62 | 808 | return (1); |
3c0ef626 | 809 | } |
810 | # else /* UTMP_USE_LIBRARY */ | |
811 | ||
665a873d | 812 | /* |
996d5e62 | 813 | * Write a utmp entry direct to the file |
814 | * This is a slightly modification of code in OpenBSD's login.c | |
815 | */ | |
3c0ef626 | 816 | static int |
817 | utmp_write_direct(struct logininfo *li, struct utmp *ut) | |
818 | { | |
819 | struct utmp old_ut; | |
820 | register int fd; | |
821 | int tty; | |
822 | ||
823 | /* FIXME: (ATL) ttyslot() needs local implementation */ | |
824 | ||
825 | #if defined(HAVE_GETTTYENT) | |
996d5e62 | 826 | struct ttyent *ty; |
3c0ef626 | 827 | |
828 | tty=0; | |
3c0ef626 | 829 | setttyent(); |
996d5e62 | 830 | while (NULL != (ty = getttyent())) { |
3c0ef626 | 831 | tty++; |
832 | if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) | |
833 | break; | |
834 | } | |
835 | endttyent(); | |
836 | ||
996d5e62 | 837 | if (NULL == ty) { |
c9f39d2c | 838 | logit("%s: tty not found", __func__); |
839 | return (0); | |
3c0ef626 | 840 | } |
841 | #else /* FIXME */ | |
842 | ||
843 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ | |
844 | ||
845 | #endif /* HAVE_GETTTYENT */ | |
846 | ||
847 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { | |
c9f39d2c | 848 | off_t pos, ret; |
849 | ||
850 | pos = (off_t)tty * sizeof(struct utmp); | |
851 | if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { | |
996d5e62 | 852 | logit("%s: lseek: %s", __func__, strerror(errno)); |
c9f39d2c | 853 | return (0); |
854 | } | |
855 | if (ret != pos) { | |
665a873d | 856 | logit("%s: Couldn't seek to tty %d slot in %s", |
996d5e62 | 857 | __func__, tty, UTMP_FILE); |
c9f39d2c | 858 | return (0); |
859 | } | |
3c0ef626 | 860 | /* |
861 | * Prevent luser from zero'ing out ut_host. | |
862 | * If the new ut_line is empty but the old one is not | |
863 | * and ut_line and ut_name match, preserve the old ut_line. | |
864 | */ | |
865 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && | |
996d5e62 | 866 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && |
867 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
868 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) | |
869 | memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); | |
3c0ef626 | 870 | |
c9f39d2c | 871 | if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { |
996d5e62 | 872 | logit("%s: lseek: %s", __func__, strerror(errno)); |
c9f39d2c | 873 | return (0); |
874 | } | |
875 | if (ret != pos) { | |
996d5e62 | 876 | logit("%s: Couldn't seek to tty %d slot in %s", |
c9f39d2c | 877 | __func__, tty, UTMP_FILE); |
878 | return (0); | |
879 | } | |
996d5e62 | 880 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { |
c9f39d2c | 881 | logit("%s: error writing %s: %s", __func__, |
3c0ef626 | 882 | UTMP_FILE, strerror(errno)); |
996d5e62 | 883 | } |
3c0ef626 | 884 | |
996d5e62 | 885 | close(fd); |
886 | return (1); | |
3c0ef626 | 887 | } else { |
996d5e62 | 888 | return (0); |
3c0ef626 | 889 | } |
890 | } | |
891 | # endif /* UTMP_USE_LIBRARY */ | |
892 | ||
893 | static int | |
894 | utmp_perform_login(struct logininfo *li) | |
895 | { | |
896 | struct utmp ut; | |
897 | ||
898 | construct_utmp(li, &ut); | |
899 | # ifdef UTMP_USE_LIBRARY | |
900 | if (!utmp_write_library(li, &ut)) { | |
996d5e62 | 901 | logit("%s: utmp_write_library() failed", __func__); |
902 | return (0); | |
3c0ef626 | 903 | } |
904 | # else | |
905 | if (!utmp_write_direct(li, &ut)) { | |
996d5e62 | 906 | logit("%s: utmp_write_direct() failed", __func__); |
907 | return (0); | |
3c0ef626 | 908 | } |
909 | # endif | |
996d5e62 | 910 | return (1); |
3c0ef626 | 911 | } |
912 | ||
913 | ||
914 | static int | |
915 | utmp_perform_logout(struct logininfo *li) | |
916 | { | |
917 | struct utmp ut; | |
918 | ||
919 | construct_utmp(li, &ut); | |
920 | # ifdef UTMP_USE_LIBRARY | |
921 | if (!utmp_write_library(li, &ut)) { | |
996d5e62 | 922 | logit("%s: utmp_write_library() failed", __func__); |
923 | return (0); | |
3c0ef626 | 924 | } |
925 | # else | |
926 | if (!utmp_write_direct(li, &ut)) { | |
996d5e62 | 927 | logit("%s: utmp_write_direct() failed", __func__); |
928 | return (0); | |
3c0ef626 | 929 | } |
930 | # endif | |
996d5e62 | 931 | return (1); |
3c0ef626 | 932 | } |
933 | ||
934 | ||
935 | int | |
936 | utmp_write_entry(struct logininfo *li) | |
937 | { | |
938 | switch(li->type) { | |
939 | case LTYPE_LOGIN: | |
996d5e62 | 940 | return (utmp_perform_login(li)); |
3c0ef626 | 941 | |
942 | case LTYPE_LOGOUT: | |
996d5e62 | 943 | return (utmp_perform_logout(li)); |
3c0ef626 | 944 | |
945 | default: | |
996d5e62 | 946 | logit("%s: invalid type field", __func__); |
947 | return (0); | |
3c0ef626 | 948 | } |
949 | } | |
950 | #endif /* USE_UTMP */ | |
951 | ||
952 | ||
953 | /** | |
954 | ** Low-level utmpx functions | |
955 | **/ | |
956 | ||
957 | /* not much point if we don't want utmpx entries */ | |
958 | #ifdef USE_UTMPX | |
959 | ||
960 | /* if we have the wherewithall, use pututxline etc. */ | |
961 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ | |
962 | defined(HAVE_PUTUTXLINE) | |
963 | # define UTMPX_USE_LIBRARY | |
964 | # endif | |
965 | ||
966 | ||
967 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
968 | # ifdef UTMPX_USE_LIBRARY | |
969 | static int | |
970 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) | |
971 | { | |
972 | setutxent(); | |
973 | pututxline(utx); | |
974 | ||
975 | # ifdef HAVE_ENDUTXENT | |
976 | endutxent(); | |
977 | # endif | |
996d5e62 | 978 | return (1); |
3c0ef626 | 979 | } |
980 | ||
981 | # else /* UTMPX_USE_LIBRARY */ | |
982 | ||
983 | /* write a utmp entry direct to the file */ | |
984 | static int | |
985 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) | |
986 | { | |
996d5e62 | 987 | logit("%s: not implemented!", __func__); |
988 | return (0); | |
3c0ef626 | 989 | } |
990 | # endif /* UTMPX_USE_LIBRARY */ | |
991 | ||
992 | static int | |
993 | utmpx_perform_login(struct logininfo *li) | |
994 | { | |
995 | struct utmpx utx; | |
996 | ||
997 | construct_utmpx(li, &utx); | |
998 | # ifdef UTMPX_USE_LIBRARY | |
999 | if (!utmpx_write_library(li, &utx)) { | |
996d5e62 | 1000 | logit("%s: utmp_write_library() failed", __func__); |
1001 | return (0); | |
3c0ef626 | 1002 | } |
1003 | # else | |
1004 | if (!utmpx_write_direct(li, &ut)) { | |
996d5e62 | 1005 | logit("%s: utmp_write_direct() failed", __func__); |
1006 | return (0); | |
3c0ef626 | 1007 | } |
1008 | # endif | |
996d5e62 | 1009 | return (1); |
3c0ef626 | 1010 | } |
1011 | ||
1012 | ||
1013 | static int | |
1014 | utmpx_perform_logout(struct logininfo *li) | |
1015 | { | |
1016 | struct utmpx utx; | |
1017 | ||
e9a17296 | 1018 | construct_utmpx(li, &utx); |
3c0ef626 | 1019 | # ifdef HAVE_ID_IN_UTMPX |
1020 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); | |
1021 | # endif | |
1022 | # ifdef HAVE_TYPE_IN_UTMPX | |
1023 | utx.ut_type = DEAD_PROCESS; | |
1024 | # endif | |
1025 | ||
1026 | # ifdef UTMPX_USE_LIBRARY | |
1027 | utmpx_write_library(li, &utx); | |
1028 | # else | |
1029 | utmpx_write_direct(li, &utx); | |
1030 | # endif | |
996d5e62 | 1031 | return (1); |
3c0ef626 | 1032 | } |
1033 | ||
1034 | int | |
1035 | utmpx_write_entry(struct logininfo *li) | |
1036 | { | |
1037 | switch(li->type) { | |
1038 | case LTYPE_LOGIN: | |
996d5e62 | 1039 | return (utmpx_perform_login(li)); |
3c0ef626 | 1040 | case LTYPE_LOGOUT: |
996d5e62 | 1041 | return (utmpx_perform_logout(li)); |
3c0ef626 | 1042 | default: |
996d5e62 | 1043 | logit("%s: invalid type field", __func__); |
1044 | return (0); | |
3c0ef626 | 1045 | } |
1046 | } | |
1047 | #endif /* USE_UTMPX */ | |
1048 | ||
1049 | ||
1050 | /** | |
1051 | ** Low-level wtmp functions | |
1052 | **/ | |
1053 | ||
1054 | #ifdef USE_WTMP | |
1055 | ||
665a873d | 1056 | /* |
996d5e62 | 1057 | * Write a wtmp entry direct to the end of the file |
1058 | * This is a slight modification of code in OpenBSD's logwtmp.c | |
1059 | */ | |
3c0ef626 | 1060 | static int |
1061 | wtmp_write(struct logininfo *li, struct utmp *ut) | |
1062 | { | |
1063 | struct stat buf; | |
1064 | int fd, ret = 1; | |
1065 | ||
1066 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
996d5e62 | 1067 | logit("%s: problem writing %s: %s", __func__, |
3c0ef626 | 1068 | WTMP_FILE, strerror(errno)); |
996d5e62 | 1069 | return (0); |
3c0ef626 | 1070 | } |
1071 | if (fstat(fd, &buf) == 0) | |
0fff78ff | 1072 | if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { |
3c0ef626 | 1073 | ftruncate(fd, buf.st_size); |
996d5e62 | 1074 | logit("%s: problem writing %s: %s", __func__, |
3c0ef626 | 1075 | WTMP_FILE, strerror(errno)); |
1076 | ret = 0; | |
1077 | } | |
996d5e62 | 1078 | close(fd); |
1079 | return (ret); | |
3c0ef626 | 1080 | } |
1081 | ||
1082 | static int | |
1083 | wtmp_perform_login(struct logininfo *li) | |
1084 | { | |
1085 | struct utmp ut; | |
1086 | ||
1087 | construct_utmp(li, &ut); | |
996d5e62 | 1088 | return (wtmp_write(li, &ut)); |
3c0ef626 | 1089 | } |
1090 | ||
1091 | ||
1092 | static int | |
1093 | wtmp_perform_logout(struct logininfo *li) | |
1094 | { | |
1095 | struct utmp ut; | |
1096 | ||
1097 | construct_utmp(li, &ut); | |
996d5e62 | 1098 | return (wtmp_write(li, &ut)); |
3c0ef626 | 1099 | } |
1100 | ||
1101 | ||
1102 | int | |
1103 | wtmp_write_entry(struct logininfo *li) | |
1104 | { | |
1105 | switch(li->type) { | |
1106 | case LTYPE_LOGIN: | |
996d5e62 | 1107 | return (wtmp_perform_login(li)); |
3c0ef626 | 1108 | case LTYPE_LOGOUT: |
996d5e62 | 1109 | return (wtmp_perform_logout(li)); |
3c0ef626 | 1110 | default: |
996d5e62 | 1111 | logit("%s: invalid type field", __func__); |
1112 | return (0); | |
3c0ef626 | 1113 | } |
1114 | } | |
1115 | ||
1116 | ||
665a873d | 1117 | /* |
996d5e62 | 1118 | * Notes on fetching login data from wtmp/wtmpx |
3c0ef626 | 1119 | * |
1120 | * Logouts are usually recorded with (amongst other things) a blank | |
1121 | * username on a given tty line. However, some systems (HP-UX is one) | |
1122 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1123 | * | |
1124 | * Since we're only looking for logins here, we know that the username | |
1125 | * must be set correctly. On systems that leave it in, we check for | |
1126 | * ut_type==USER_PROCESS (indicating a login.) | |
1127 | * | |
1128 | * Portability: Some systems may set something other than USER_PROCESS | |
1129 | * to indicate a login process. I don't know of any as I write. Also, | |
1130 | * it's possible that some systems may both leave the username in | |
1131 | * place and not have ut_type. | |
1132 | */ | |
1133 | ||
1134 | /* return true if this wtmp entry indicates a login */ | |
1135 | static int | |
1136 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1137 | { | |
1138 | if (strncmp(li->username, ut->ut_name, | |
996d5e62 | 1139 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { |
3c0ef626 | 1140 | # ifdef HAVE_TYPE_IN_UTMP |
1141 | if (ut->ut_type & USER_PROCESS) | |
996d5e62 | 1142 | return (1); |
3c0ef626 | 1143 | # else |
996d5e62 | 1144 | return (1); |
3c0ef626 | 1145 | # endif |
1146 | } | |
996d5e62 | 1147 | return (0); |
3c0ef626 | 1148 | } |
1149 | ||
1150 | int | |
1151 | wtmp_get_entry(struct logininfo *li) | |
1152 | { | |
1153 | struct stat st; | |
1154 | struct utmp ut; | |
996d5e62 | 1155 | int fd, found = 0; |
3c0ef626 | 1156 | |
1157 | /* Clear the time entries in our logininfo */ | |
1158 | li->tv_sec = li->tv_usec = 0; | |
1159 | ||
1160 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
665a873d | 1161 | logit("%s: problem opening %s: %s", __func__, |
3c0ef626 | 1162 | WTMP_FILE, strerror(errno)); |
996d5e62 | 1163 | return (0); |
3c0ef626 | 1164 | } |
1165 | if (fstat(fd, &st) != 0) { | |
665a873d | 1166 | logit("%s: couldn't stat %s: %s", __func__, |
3c0ef626 | 1167 | WTMP_FILE, strerror(errno)); |
1168 | close(fd); | |
996d5e62 | 1169 | return (0); |
3c0ef626 | 1170 | } |
1171 | ||
1172 | /* Seek to the start of the last struct utmp */ | |
1173 | if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) { | |
1174 | /* Looks like we've got a fresh wtmp file */ | |
1175 | close(fd); | |
996d5e62 | 1176 | return (0); |
3c0ef626 | 1177 | } |
1178 | ||
1179 | while (!found) { | |
1180 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { | |
665a873d | 1181 | logit("%s: read of %s failed: %s", __func__, |
3c0ef626 | 1182 | WTMP_FILE, strerror(errno)); |
1183 | close (fd); | |
996d5e62 | 1184 | return (0); |
3c0ef626 | 1185 | } |
1186 | if ( wtmp_islogin(li, &ut) ) { | |
1187 | found = 1; | |
996d5e62 | 1188 | /* |
1189 | * We've already checked for a time in struct | |
1190 | * utmp, in login_getlast() | |
1191 | */ | |
3c0ef626 | 1192 | # ifdef HAVE_TIME_IN_UTMP |
1193 | li->tv_sec = ut.ut_time; | |
1194 | # else | |
1195 | # if HAVE_TV_IN_UTMP | |
1196 | li->tv_sec = ut.ut_tv.tv_sec; | |
1197 | # endif | |
1198 | # endif | |
1199 | line_fullname(li->line, ut.ut_line, | |
996d5e62 | 1200 | MIN_SIZEOF(li->line, ut.ut_line)); |
3c0ef626 | 1201 | # ifdef HAVE_HOST_IN_UTMP |
1202 | strlcpy(li->hostname, ut.ut_host, | |
996d5e62 | 1203 | MIN_SIZEOF(li->hostname, ut.ut_host)); |
3c0ef626 | 1204 | # endif |
1205 | continue; | |
1206 | } | |
1207 | /* Seek back 2 x struct utmp */ | |
1208 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) { | |
1209 | /* We've found the start of the file, so quit */ | |
996d5e62 | 1210 | close(fd); |
1211 | return (0); | |
3c0ef626 | 1212 | } |
1213 | } | |
1214 | ||
1215 | /* We found an entry. Tidy up and return */ | |
1216 | close(fd); | |
996d5e62 | 1217 | return (1); |
3c0ef626 | 1218 | } |
1219 | # endif /* USE_WTMP */ | |
1220 | ||
1221 | ||
1222 | /** | |
1223 | ** Low-level wtmpx functions | |
1224 | **/ | |
1225 | ||
1226 | #ifdef USE_WTMPX | |
996d5e62 | 1227 | /* |
1228 | * Write a wtmpx entry direct to the end of the file | |
1229 | * This is a slight modification of code in OpenBSD's logwtmp.c | |
1230 | */ | |
3c0ef626 | 1231 | static int |
1232 | wtmpx_write(struct logininfo *li, struct utmpx *utx) | |
1233 | { | |
cdd66111 | 1234 | #ifndef HAVE_UPDWTMPX |
3c0ef626 | 1235 | struct stat buf; |
1236 | int fd, ret = 1; | |
1237 | ||
1238 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
665a873d | 1239 | logit("%s: problem opening %s: %s", __func__, |
3c0ef626 | 1240 | WTMPX_FILE, strerror(errno)); |
996d5e62 | 1241 | return (0); |
3c0ef626 | 1242 | } |
1243 | ||
1244 | if (fstat(fd, &buf) == 0) | |
0fff78ff | 1245 | if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) { |
3c0ef626 | 1246 | ftruncate(fd, buf.st_size); |
996d5e62 | 1247 | logit("%s: problem writing %s: %s", __func__, |
3c0ef626 | 1248 | WTMPX_FILE, strerror(errno)); |
1249 | ret = 0; | |
1250 | } | |
996d5e62 | 1251 | close(fd); |
3c0ef626 | 1252 | |
996d5e62 | 1253 | return (ret); |
cdd66111 | 1254 | #else |
1255 | updwtmpx(WTMPX_FILE, utx); | |
996d5e62 | 1256 | return (1); |
cdd66111 | 1257 | #endif |
3c0ef626 | 1258 | } |
1259 | ||
1260 | ||
1261 | static int | |
1262 | wtmpx_perform_login(struct logininfo *li) | |
1263 | { | |
1264 | struct utmpx utx; | |
1265 | ||
1266 | construct_utmpx(li, &utx); | |
996d5e62 | 1267 | return (wtmpx_write(li, &utx)); |
3c0ef626 | 1268 | } |
1269 | ||
1270 | ||
1271 | static int | |
1272 | wtmpx_perform_logout(struct logininfo *li) | |
1273 | { | |
1274 | struct utmpx utx; | |
1275 | ||
1276 | construct_utmpx(li, &utx); | |
996d5e62 | 1277 | return (wtmpx_write(li, &utx)); |
3c0ef626 | 1278 | } |
1279 | ||
1280 | ||
1281 | int | |
1282 | wtmpx_write_entry(struct logininfo *li) | |
1283 | { | |
1284 | switch(li->type) { | |
1285 | case LTYPE_LOGIN: | |
996d5e62 | 1286 | return (wtmpx_perform_login(li)); |
3c0ef626 | 1287 | case LTYPE_LOGOUT: |
996d5e62 | 1288 | return (wtmpx_perform_logout(li)); |
3c0ef626 | 1289 | default: |
996d5e62 | 1290 | logit("%s: invalid type field", __func__); |
1291 | return (0); | |
3c0ef626 | 1292 | } |
1293 | } | |
1294 | ||
1295 | /* Please see the notes above wtmp_islogin() for information about the | |
1296 | next two functions */ | |
1297 | ||
1298 | /* Return true if this wtmpx entry indicates a login */ | |
1299 | static int | |
1300 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1301 | { | |
996d5e62 | 1302 | if (strncmp(li->username, utx->ut_name, |
1303 | MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) { | |
3c0ef626 | 1304 | # ifdef HAVE_TYPE_IN_UTMPX |
1305 | if (utx->ut_type == USER_PROCESS) | |
996d5e62 | 1306 | return (1); |
3c0ef626 | 1307 | # else |
996d5e62 | 1308 | return (1); |
3c0ef626 | 1309 | # endif |
1310 | } | |
996d5e62 | 1311 | return (0); |
3c0ef626 | 1312 | } |
1313 | ||
1314 | ||
1315 | int | |
1316 | wtmpx_get_entry(struct logininfo *li) | |
1317 | { | |
1318 | struct stat st; | |
1319 | struct utmpx utx; | |
1320 | int fd, found=0; | |
1321 | ||
1322 | /* Clear the time entries */ | |
1323 | li->tv_sec = li->tv_usec = 0; | |
1324 | ||
1325 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
665a873d | 1326 | logit("%s: problem opening %s: %s", __func__, |
3c0ef626 | 1327 | WTMPX_FILE, strerror(errno)); |
996d5e62 | 1328 | return (0); |
3c0ef626 | 1329 | } |
1330 | if (fstat(fd, &st) != 0) { | |
665a873d | 1331 | logit("%s: couldn't stat %s: %s", __func__, |
41b2f314 | 1332 | WTMPX_FILE, strerror(errno)); |
3c0ef626 | 1333 | close(fd); |
996d5e62 | 1334 | return (0); |
3c0ef626 | 1335 | } |
1336 | ||
1337 | /* Seek to the start of the last struct utmpx */ | |
1338 | if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) { | |
1339 | /* probably a newly rotated wtmpx file */ | |
1340 | close(fd); | |
996d5e62 | 1341 | return (0); |
3c0ef626 | 1342 | } |
1343 | ||
1344 | while (!found) { | |
1345 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { | |
665a873d | 1346 | logit("%s: read of %s failed: %s", __func__, |
3c0ef626 | 1347 | WTMPX_FILE, strerror(errno)); |
1348 | close (fd); | |
996d5e62 | 1349 | return (0); |
3c0ef626 | 1350 | } |
996d5e62 | 1351 | /* |
665a873d | 1352 | * Logouts are recorded as a blank username on a particular |
996d5e62 | 1353 | * line. So, we just need to find the username in struct utmpx |
1354 | */ | |
1355 | if (wtmpx_islogin(li, &utx)) { | |
41b2f314 | 1356 | found = 1; |
996d5e62 | 1357 | # if defined(HAVE_TV_IN_UTMPX) |
3c0ef626 | 1358 | li->tv_sec = utx.ut_tv.tv_sec; |
996d5e62 | 1359 | # elif defined(HAVE_TIME_IN_UTMPX) |
3c0ef626 | 1360 | li->tv_sec = utx.ut_time; |
3c0ef626 | 1361 | # endif |
1362 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); | |
996d5e62 | 1363 | # if defined(HAVE_HOST_IN_UTMPX) |
3c0ef626 | 1364 | strlcpy(li->hostname, utx.ut_host, |
996d5e62 | 1365 | MIN_SIZEOF(li->hostname, utx.ut_host)); |
3c0ef626 | 1366 | # endif |
1367 | continue; | |
1368 | } | |
1369 | if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
996d5e62 | 1370 | close(fd); |
1371 | return (0); | |
3c0ef626 | 1372 | } |
1373 | } | |
1374 | ||
1375 | close(fd); | |
996d5e62 | 1376 | return (1); |
3c0ef626 | 1377 | } |
1378 | #endif /* USE_WTMPX */ | |
1379 | ||
1380 | /** | |
1381 | ** Low-level libutil login() functions | |
1382 | **/ | |
1383 | ||
1384 | #ifdef USE_LOGIN | |
1385 | static int | |
1386 | syslogin_perform_login(struct logininfo *li) | |
1387 | { | |
1388 | struct utmp *ut; | |
1389 | ||
996d5e62 | 1390 | ut = xmalloc(sizeof(*ut)); |
3c0ef626 | 1391 | construct_utmp(li, ut); |
1392 | login(ut); | |
6a9b3198 | 1393 | free(ut); |
3c0ef626 | 1394 | |
996d5e62 | 1395 | return (1); |
3c0ef626 | 1396 | } |
1397 | ||
1398 | static int | |
1399 | syslogin_perform_logout(struct logininfo *li) | |
1400 | { | |
1401 | # ifdef HAVE_LOGOUT | |
99be0775 | 1402 | char line[UT_LINESIZE]; |
3c0ef626 | 1403 | |
1404 | (void)line_stripname(line, li->line, sizeof(line)); | |
1405 | ||
996d5e62 | 1406 | if (!logout(line)) |
1407 | logit("%s: logout() returned an error", __func__); | |
3c0ef626 | 1408 | # ifdef HAVE_LOGWTMP |
996d5e62 | 1409 | else |
3c0ef626 | 1410 | logwtmp(line, "", ""); |
1411 | # endif | |
3c0ef626 | 1412 | /* FIXME: (ATL - if the need arises) What to do if we have |
1413 | * login, but no logout? what if logout but no logwtmp? All | |
1414 | * routines are in libutil so they should all be there, | |
1415 | * but... */ | |
1416 | # endif | |
996d5e62 | 1417 | return (1); |
3c0ef626 | 1418 | } |
1419 | ||
1420 | int | |
1421 | syslogin_write_entry(struct logininfo *li) | |
1422 | { | |
1423 | switch (li->type) { | |
1424 | case LTYPE_LOGIN: | |
996d5e62 | 1425 | return (syslogin_perform_login(li)); |
3c0ef626 | 1426 | case LTYPE_LOGOUT: |
996d5e62 | 1427 | return (syslogin_perform_logout(li)); |
3c0ef626 | 1428 | default: |
996d5e62 | 1429 | logit("%s: Invalid type field", __func__); |
1430 | return (0); | |
3c0ef626 | 1431 | } |
1432 | } | |
1433 | #endif /* USE_LOGIN */ | |
1434 | ||
1435 | /* end of file log-syslogin.c */ | |
1436 | ||
1437 | /** | |
1438 | ** Low-level lastlog functions | |
1439 | **/ | |
1440 | ||
1441 | #ifdef USE_LASTLOG | |
1442 | #define LL_FILE 1 | |
1443 | #define LL_DIR 2 | |
1444 | #define LL_OTHER 3 | |
1445 | ||
1446 | static void | |
1447 | lastlog_construct(struct logininfo *li, struct lastlog *last) | |
1448 | { | |
1449 | /* clear the structure */ | |
1450 | memset(last, '\0', sizeof(*last)); | |
1451 | ||
996d5e62 | 1452 | line_stripname(last->ll_line, li->line, sizeof(last->ll_line)); |
3c0ef626 | 1453 | strlcpy(last->ll_host, li->hostname, |
1454 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1455 | last->ll_time = li->tv_sec; | |
1456 | } | |
1457 | ||
1458 | static int | |
1459 | lastlog_filetype(char *filename) | |
1460 | { | |
1461 | struct stat st; | |
1462 | ||
1463 | if (stat(LASTLOG_FILE, &st) != 0) { | |
996d5e62 | 1464 | logit("%s: Couldn't stat %s: %s", __func__, |
1465 | LASTLOG_FILE, strerror(errno)); | |
1466 | return (0); | |
3c0ef626 | 1467 | } |
1468 | if (S_ISDIR(st.st_mode)) | |
996d5e62 | 1469 | return (LL_DIR); |
3c0ef626 | 1470 | else if (S_ISREG(st.st_mode)) |
996d5e62 | 1471 | return (LL_FILE); |
3c0ef626 | 1472 | else |
996d5e62 | 1473 | return (LL_OTHER); |
3c0ef626 | 1474 | } |
1475 | ||
1476 | ||
1477 | /* open the file (using filemode) and seek to the login entry */ | |
1478 | static int | |
1479 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) | |
1480 | { | |
1481 | off_t offset; | |
1482 | int type; | |
1483 | char lastlog_file[1024]; | |
1484 | ||
1485 | type = lastlog_filetype(LASTLOG_FILE); | |
1486 | switch (type) { | |
996d5e62 | 1487 | case LL_FILE: |
1488 | strlcpy(lastlog_file, LASTLOG_FILE, | |
1489 | sizeof(lastlog_file)); | |
1490 | break; | |
1491 | case LL_DIR: | |
1492 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1493 | LASTLOG_FILE, li->username); | |
1494 | break; | |
1495 | default: | |
1496 | logit("%s: %.100s is not a file or directory!", __func__, | |
1497 | LASTLOG_FILE); | |
1498 | return (0); | |
3c0ef626 | 1499 | } |
1500 | ||
0fff78ff | 1501 | *fd = open(lastlog_file, filemode, 0600); |
996d5e62 | 1502 | if (*fd < 0) { |
1503 | debug("%s: Couldn't open %s: %s", __func__, | |
3c0ef626 | 1504 | lastlog_file, strerror(errno)); |
996d5e62 | 1505 | return (0); |
3c0ef626 | 1506 | } |
1507 | ||
1508 | if (type == LL_FILE) { | |
1509 | /* find this uid's offset in the lastlog file */ | |
1510 | offset = (off_t) ((long)li->uid * sizeof(struct lastlog)); | |
1511 | ||
996d5e62 | 1512 | if (lseek(*fd, offset, SEEK_SET) != offset) { |
1513 | logit("%s: %s->lseek(): %s", __func__, | |
1514 | lastlog_file, strerror(errno)); | |
1515 | return (0); | |
3c0ef626 | 1516 | } |
1517 | } | |
1518 | ||
996d5e62 | 1519 | return (1); |
3c0ef626 | 1520 | } |
1521 | ||
1522 | static int | |
1523 | lastlog_perform_login(struct logininfo *li) | |
1524 | { | |
1525 | struct lastlog last; | |
1526 | int fd; | |
1527 | ||
1528 | /* create our struct lastlog */ | |
1529 | lastlog_construct(li, &last); | |
1530 | ||
1531 | if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) | |
996d5e62 | 1532 | return (0); |
3c0ef626 | 1533 | |
1534 | /* write the entry */ | |
0fff78ff | 1535 | if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) { |
3c0ef626 | 1536 | close(fd); |
996d5e62 | 1537 | logit("%s: Error writing to %s: %s", __func__, |
3c0ef626 | 1538 | LASTLOG_FILE, strerror(errno)); |
996d5e62 | 1539 | return (0); |
3c0ef626 | 1540 | } |
1541 | ||
1542 | close(fd); | |
996d5e62 | 1543 | return (1); |
3c0ef626 | 1544 | } |
1545 | ||
1546 | int | |
1547 | lastlog_write_entry(struct logininfo *li) | |
1548 | { | |
1549 | switch(li->type) { | |
1550 | case LTYPE_LOGIN: | |
996d5e62 | 1551 | return (lastlog_perform_login(li)); |
3c0ef626 | 1552 | default: |
996d5e62 | 1553 | logit("%s: Invalid type field", __func__); |
1554 | return (0); | |
3c0ef626 | 1555 | } |
1556 | } | |
1557 | ||
1558 | static void | |
1559 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) | |
1560 | { | |
1561 | line_fullname(li->line, last->ll_line, sizeof(li->line)); | |
1562 | strlcpy(li->hostname, last->ll_host, | |
996d5e62 | 1563 | MIN_SIZEOF(li->hostname, last->ll_host)); |
3c0ef626 | 1564 | li->tv_sec = last->ll_time; |
1565 | } | |
1566 | ||
1567 | int | |
1568 | lastlog_get_entry(struct logininfo *li) | |
1569 | { | |
1570 | struct lastlog last; | |
6a9b3198 | 1571 | int fd, ret; |
3c0ef626 | 1572 | |
1573 | if (!lastlog_openseek(li, &fd, O_RDONLY)) | |
6a9b3198 | 1574 | return (0); |
3c0ef626 | 1575 | |
6a9b3198 | 1576 | ret = atomicio(read, fd, &last, sizeof(last)); |
3c0ef626 | 1577 | close(fd); |
1578 | ||
6a9b3198 | 1579 | switch (ret) { |
1580 | case 0: | |
1581 | memset(&last, '\0', sizeof(last)); | |
1582 | /* FALLTHRU */ | |
1583 | case sizeof(last): | |
1584 | lastlog_populate_entry(li, &last); | |
1585 | return (1); | |
1586 | case -1: | |
cdd66111 | 1587 | error("%s: Error reading from %s: %s", __func__, |
6a9b3198 | 1588 | LASTLOG_FILE, strerror(errno)); |
1589 | return (0); | |
1590 | default: | |
1591 | error("%s: Error reading from %s: Expecting %d, got %d", | |
1592 | __func__, LASTLOG_FILE, sizeof(last), ret); | |
1593 | return (0); | |
1594 | } | |
3c0ef626 | 1595 | |
6a9b3198 | 1596 | /* NOTREACHED */ |
1597 | return (0); | |
3c0ef626 | 1598 | } |
1599 | #endif /* USE_LASTLOG */ | |
996d5e62 | 1600 | |
1601 | #ifdef USE_BTMP | |
1602 | /* | |
1603 | * Logs failed login attempts in _PATH_BTMP if that exists. | |
1604 | * The most common login failure is to give password instead of username. | |
1605 | * So the _PATH_BTMP file checked for the correct permission, so that | |
1606 | * only root can read it. | |
1607 | */ | |
1608 | ||
1609 | void | |
1610 | record_failed_login(const char *username, const char *hostname, | |
1611 | const char *ttyn) | |
1612 | { | |
1613 | int fd; | |
1614 | struct utmp ut; | |
1615 | struct sockaddr_storage from; | |
1616 | size_t fromlen = sizeof(from); | |
1617 | struct sockaddr_in *a4; | |
1618 | struct sockaddr_in6 *a6; | |
1619 | time_t t; | |
1620 | struct stat fst; | |
1621 | ||
1622 | if (geteuid() != 0) | |
1623 | return; | |
1624 | if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) { | |
1625 | debug("Unable to open the btmp file %s: %s", _PATH_BTMP, | |
1626 | strerror(errno)); | |
1627 | return; | |
1628 | } | |
1629 | if (fstat(fd, &fst) < 0) { | |
1630 | logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP, | |
1631 | strerror(errno)); | |
1632 | goto out; | |
1633 | } | |
1634 | if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){ | |
1635 | logit("Excess permission or bad ownership on file %s", | |
1636 | _PATH_BTMP); | |
1637 | goto out; | |
1638 | } | |
1639 | ||
1640 | memset(&ut, 0, sizeof(ut)); | |
1641 | /* strncpy because we don't necessarily want nul termination */ | |
1642 | strncpy(ut.ut_user, username, sizeof(ut.ut_user)); | |
1643 | strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line)); | |
1644 | ||
1645 | time(&t); | |
1646 | ut.ut_time = t; /* ut_time is not always a time_t */ | |
1647 | ut.ut_type = LOGIN_PROCESS; | |
1648 | ut.ut_pid = getpid(); | |
1649 | ||
1650 | /* strncpy because we don't necessarily want nul termination */ | |
1651 | strncpy(ut.ut_host, hostname, sizeof(ut.ut_host)); | |
1652 | ||
1653 | if (packet_connection_is_on_socket() && | |
1654 | getpeername(packet_get_connection_in(), | |
1655 | (struct sockaddr *)&from, &fromlen) == 0) { | |
1656 | ipv64_normalise_mapped(&from, &fromlen); | |
1657 | if (from.ss_family == AF_INET) { | |
1658 | a4 = (struct sockaddr_in *)&from; | |
1659 | memcpy(&ut.ut_addr, &(a4->sin_addr), | |
1660 | MIN_SIZEOF(ut.ut_addr, a4->sin_addr)); | |
1661 | } | |
1662 | #ifdef HAVE_ADDR_V6_IN_UTMP | |
1663 | if (from.ss_family == AF_INET6) { | |
1664 | a6 = (struct sockaddr_in6 *)&from; | |
1665 | memcpy(&ut.ut_addr_v6, &(a6->sin6_addr), | |
1666 | MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr)); | |
1667 | } | |
1668 | #endif | |
1669 | } | |
1670 | ||
1671 | if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut)) | |
1672 | error("Failed to write to %s: %s", _PATH_BTMP, | |
1673 | strerror(errno)); | |
1674 | ||
1675 | out: | |
1676 | close(fd); | |
1677 | } | |
1678 | #endif /* USE_BTMP */ |