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1d7b9b20 | 1 | /* |
2 | * Copyright (c) 2000 Andre Lucas. All rights reserved. | |
564dd50a | 3 | * Portions copyright (c) 1998 Todd C. Miller |
4 | * Portions copyright (c) 1996 Jason Downs | |
5 | * Portions copyright (c) 1996 Theo de Raadt | |
1d7b9b20 | 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. | |
15 | * 3. All advertising materials mentioning features or use of this software | |
16 | * must display the following acknowledgement: | |
17 | * This product includes software developed by Markus Friedl. | |
18 | * 4. The name of the author may not be used to endorse or promote products | |
19 | * derived from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
22 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
23 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
24 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
25 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
26 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
30 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
31 | */ | |
32 | ||
33 | /** | |
34 | ** loginrec.c: platform-independent login recording and lastlog retrieval | |
35 | **/ | |
36 | ||
564dd50a | 37 | /* |
38 | The new login code explained | |
39 | ============================ | |
40 | ||
41 | This code attempts to provide a common interface to login recording | |
42 | (utmp and friends) and last login time retrieval. | |
43 | ||
44 | Its primary means of achieving this is to use 'struct logininfo', a | |
45 | union of all the useful fields in the various different types of | |
46 | system login record structures one finds on UNIX variants. | |
47 | ||
48 | We depend on autoconf to define which recording methods are to be | |
49 | used, and which fields are contained in the relevant data structures | |
50 | on the local system. Many C preprocessor symbols affect which code | |
51 | gets compiled here. | |
52 | ||
53 | The code is designed to make it easy to modify a particular | |
54 | recording method, without affecting other methods nor requiring so | |
55 | many nested conditional compilation blocks as were commonplace in | |
56 | the old code. | |
57 | ||
58 | For login recording, we try to use the local system's libraries as | |
59 | these are clearly most likely to work correctly. For utmp systems | |
60 | this usually means login() and logout() or setutent() etc., probably | |
61 | in libutil, along with logwtmp() etc. On these systems, we fall back | |
62 | to writing the files directly if we have to, though this method | |
63 | requires very thorough testing so we do not corrupt local auditing | |
64 | information. These files and their access methods are very system | |
65 | specific indeed. | |
66 | ||
67 | For utmpx systems, the corresponding library functions are | |
68 | setutxent() etc. To the author's knowledge, all utmpx systems have | |
69 | these library functions and so no direct write is attempted. If such | |
70 | a system exists and needs support, direct analogues of the [uw]tmp | |
71 | code should suffice. | |
72 | ||
73 | Retrieving the time of last login ('lastlog') is in some ways even | |
74 | more problemmatic than login recording. Some systems provide a | |
75 | simple table of all users which we seek based on uid and retrieve a | |
76 | relatively standard structure. Others record the same information in | |
77 | a directory with a separate file, and others don't record the | |
78 | information separately at all. For systems in the latter category, | |
79 | we look backwards in the wtmp or wtmpx file for the last login entry | |
80 | for our user. Naturally this is slower and on busy systems could | |
81 | incur a significant performance penalty. | |
82 | ||
83 | Calling the new code | |
84 | -------------------- | |
85 | ||
86 | In OpenSSH all login recording and retrieval is performed in | |
87 | login.c. Here you'll find working examples. Also, in the logintest.c | |
88 | program there are more examples. | |
89 | ||
90 | Internal handler calling method | |
91 | ------------------------------- | |
92 | ||
93 | When a call is made to login_login() or login_logout(), both | |
94 | routines set a struct logininfo flag defining which action (log in, | |
95 | or log out) is to be taken. They both then call login_write(), which | |
96 | calls whichever of the many structure-specific handlers autoconf | |
97 | selects for the local system. | |
98 | ||
99 | The handlers themselves handle system data structure specifics. Both | |
100 | struct utmp and struct utmpx have utility functions (see | |
101 | construct_utmp*()) to try to make it simpler to add extra systems | |
102 | that introduce new features to either structure. | |
103 | ||
104 | While it may seem terribly wasteful to replicate so much similar | |
105 | code for each method, experience has shown that maintaining code to | |
106 | write both struct utmp and utmpx in one function, whilst maintaining | |
107 | support for all systems whether they have library support or not, is | |
108 | a difficult and time-consuming task. | |
109 | ||
110 | Lastlog support proceeds similarly. Functions login_get_lastlog() | |
111 | (and its OpenSSH-tuned friend login_get_lastlog_time()) call | |
112 | getlast_entry(), which tries one of three methods to find the last | |
113 | login time. It uses local system lastlog support if it can, | |
114 | otherwise it tries wtmp or wtmpx before giving up and returning 0, | |
115 | meaning "tilt". | |
116 | ||
117 | Maintenance | |
118 | ----------- | |
119 | ||
120 | In many cases it's possible to tweak autoconf to select the correct | |
121 | methods for a particular platform, either by improving the detection | |
122 | code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE | |
123 | symbols for the platform. | |
124 | ||
125 | Use logintest to check which symbols are defined before modifying | |
126 | configure.in and loginrec.c. (You have to build logintest yourself | |
127 | with 'make logintest' as it's not built by default.) | |
128 | ||
129 | Otherwise, patches to the specific method(s) are very helpful! | |
130 | ||
131 | */ | |
132 | ||
1d7b9b20 | 133 | /** |
134 | ** TODO: | |
564dd50a | 135 | ** homegrown ttyslot()q |
136 | ** test, test, test | |
1d7b9b20 | 137 | ** |
138 | ** Platform status: | |
139 | ** ---------------- | |
140 | ** | |
141 | ** Known good: | |
142 | ** Linux (Redhat 6.2, need more variants) | |
143 | ** HP-UX 10.20 (gcc only) | |
5abcdf8e | 144 | ** IRIX |
1d7b9b20 | 145 | ** |
146 | ** Testing required: Please send reports! | |
147 | ** Solaris | |
1d7b9b20 | 148 | ** NetBSD |
149 | ** HP-UX 11 | |
a3cef3ca | 150 | ** AIX |
1d7b9b20 | 151 | ** |
152 | ** Platforms with known problems: | |
1d7b9b20 | 153 | ** NeXT |
154 | ** | |
155 | **/ | |
156 | ||
157 | #include "includes.h" | |
158 | ||
1d7b9b20 | 159 | #include "ssh.h" |
160 | #include "xmalloc.h" | |
161 | #include "loginrec.h" | |
162 | ||
163 | RCSID("$Id$"); | |
164 | ||
1d7b9b20 | 165 | /** |
166 | ** prototypes for helper functions in this file | |
167 | **/ | |
168 | ||
169 | #if HAVE_UTMP_H | |
1d7b9b20 | 170 | void set_utmp_time(struct logininfo *li, struct utmp *ut); |
171 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
172 | #endif | |
173 | ||
174 | #ifdef HAVE_UTMPX_H | |
1d7b9b20 | 175 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); |
176 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
177 | #endif | |
178 | ||
179 | int utmp_write_entry(struct logininfo *li); | |
180 | int utmpx_write_entry(struct logininfo *li); | |
181 | int wtmp_write_entry(struct logininfo *li); | |
182 | int wtmpx_write_entry(struct logininfo *li); | |
183 | int lastlog_write_entry(struct logininfo *li); | |
184 | int syslogin_write_entry(struct logininfo *li); | |
185 | ||
186 | int getlast_entry(struct logininfo *li); | |
187 | int lastlog_get_entry(struct logininfo *li); | |
188 | int wtmp_get_entry(struct logininfo *li); | |
189 | int wtmpx_get_entry(struct logininfo *li); | |
190 | ||
5abcdf8e | 191 | /* pick the shortest string */ |
192 | #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) ) | |
193 | ||
1d7b9b20 | 194 | /** |
195 | ** platform-independent login functions | |
196 | **/ | |
197 | ||
5abcdf8e | 198 | /* login_login(struct logininfo *) -Record a login |
199 | * | |
200 | * Call with a pointer to a struct logininfo initialised with | |
201 | * login_init_entry() or login_alloc_entry() | |
202 | * | |
203 | * Returns: | |
204 | * >0 if successful | |
205 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
206 | */ | |
564dd50a | 207 | int |
208 | login_login (struct logininfo *li) | |
209 | { | |
210 | li->type = LTYPE_LOGIN; | |
211 | return login_write(li); | |
212 | } | |
1d7b9b20 | 213 | |
214 | ||
5abcdf8e | 215 | /* login_logout(struct logininfo *) - Record a logout |
216 | * | |
217 | * Call as with login_login() | |
218 | * | |
219 | * Returns: | |
220 | * >0 if successful | |
221 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
222 | */ | |
564dd50a | 223 | int |
224 | login_logout(struct logininfo *li) | |
225 | { | |
226 | li->type = LTYPE_LOGOUT; | |
227 | return login_write(li); | |
1d7b9b20 | 228 | } |
229 | ||
5abcdf8e | 230 | /* login_get_lastlog_time(int) - Retrieve the last login time |
231 | * | |
232 | * Retrieve the last login time for the given uid. Will try to use the | |
233 | * system lastlog facilities if they are available, but will fall back | |
234 | * to looking in wtmp/wtmpx if necessary | |
235 | * | |
236 | * Returns: | |
237 | * 0 on failure, or if user has never logged in | |
238 | * Time in seconds from the epoch if successful | |
239 | * | |
240 | * Useful preprocessor symbols: | |
241 | * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog | |
242 | * info | |
243 | * USE_LASTLOG: If set, indicates the presence of system lastlog | |
244 | * facilities. If this and DISABLE_LASTLOG are not set, | |
245 | * try to retrieve lastlog information from wtmp/wtmpx. | |
246 | */ | |
564dd50a | 247 | unsigned int |
248 | login_get_lastlog_time(const int uid) | |
249 | { | |
250 | struct logininfo li; | |
1d7b9b20 | 251 | |
5abcdf8e | 252 | if (login_get_lastlog(&li, uid)) |
253 | return li.tv_sec; | |
254 | else | |
255 | return 0; | |
564dd50a | 256 | } |
1d7b9b20 | 257 | |
5abcdf8e | 258 | /* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry |
259 | * | |
260 | * Retrieve a logininfo structure populated (only partially) with | |
261 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
262 | * system lastlog information exists. | |
263 | * | |
264 | * Note this routine must be given a pre-allocated logininfo. | |
265 | * | |
266 | * Returns: | |
267 | * >0: A pointer to your struct logininfo if successful | |
268 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
269 | * | |
270 | */ | |
564dd50a | 271 | struct logininfo * |
272 | login_get_lastlog(struct logininfo *li, const int uid) | |
273 | { | |
5abcdf8e | 274 | struct passwd *pw; |
5abcdf8e | 275 | |
564dd50a | 276 | memset(li, '\0', sizeof(struct logininfo)); |
1d7b9b20 | 277 | li->uid = uid; |
5abcdf8e | 278 | |
9f32ceb4 | 279 | /* |
280 | * If we don't have a 'real' lastlog, we need the username to | |
5abcdf8e | 281 | * reliably search wtmp(x) for the last login (see |
9f32ceb4 | 282 | * wtmp_get_entry().) |
283 | */ | |
5abcdf8e | 284 | pw = getpwuid(uid); |
a05a70ab | 285 | if (pw == NULL) |
286 | fatal("login_get_lastlog: Cannot find account for uid %i", uid); | |
287 | ||
1bfbb762 | 288 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the |
289 | * username */ | |
d8caae24 | 290 | strlcpy(li->username, pw->pw_name, sizeof(li->username)); |
a05a70ab | 291 | |
564dd50a | 292 | if (getlast_entry(li)) |
293 | return li; | |
294 | else | |
a05a70ab | 295 | return NULL; |
1d7b9b20 | 296 | } |
297 | ||
1d7b9b20 | 298 | |
5abcdf8e | 299 | /* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise |
300 | * a logininfo structure | |
301 | * | |
302 | * This function creates a new struct logininfo, a data structure | |
303 | * meant to carry the information required to portably record login info. | |
304 | * | |
305 | * Returns a pointer to a newly created struct logininfo. If memory | |
306 | * allocation fails, the program halts. | |
307 | */ | |
564dd50a | 308 | struct |
309 | logininfo *login_alloc_entry(int pid, const char *username, | |
310 | const char *hostname, const char *line) | |
311 | { | |
312 | struct logininfo *newli; | |
1d7b9b20 | 313 | |
564dd50a | 314 | newli = (struct logininfo *) xmalloc (sizeof(struct logininfo)); |
315 | (void)login_init_entry(newli, pid, username, hostname, line); | |
316 | return newli; | |
1d7b9b20 | 317 | } |
318 | ||
319 | ||
5abcdf8e | 320 | /* login_free_entry(struct logininfo *) - free struct memory */ |
1d7b9b20 | 321 | void |
564dd50a | 322 | login_free_entry(struct logininfo *li) |
323 | { | |
324 | xfree(li); | |
1d7b9b20 | 325 | } |
326 | ||
327 | ||
5abcdf8e | 328 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) |
329 | * - initialise a struct logininfo | |
330 | * | |
331 | * Populates a new struct logininfo, a data structure meant to carry | |
332 | * the information required to portably record login info. | |
333 | * | |
334 | * Returns: 1 | |
335 | */ | |
564dd50a | 336 | int |
337 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
338 | const char *hostname, const char *line) | |
339 | { | |
d8caae24 | 340 | struct passwd *pw; |
341 | ||
564dd50a | 342 | memset(li, 0, sizeof(struct logininfo)); |
343 | ||
344 | li->pid = pid; | |
d8caae24 | 345 | |
564dd50a | 346 | /* set the line information */ |
347 | if (line) | |
348 | line_fullname(li->line, line, sizeof(li->line)); | |
1d7b9b20 | 349 | |
d8caae24 | 350 | if (username) { |
564dd50a | 351 | strlcpy(li->username, username, sizeof(li->username)); |
d8caae24 | 352 | pw = getpwnam(li->username); |
353 | if (pw == NULL) | |
354 | fatal("login_init_entry: Cannot find user \"%s\"", li->username); | |
355 | li->uid = pw->pw_uid; | |
356 | } | |
a05a70ab | 357 | |
564dd50a | 358 | if (hostname) |
359 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
d8caae24 | 360 | |
564dd50a | 361 | return 1; |
1d7b9b20 | 362 | } |
363 | ||
5abcdf8e | 364 | /* login_set_current_time(struct logininfo *) - set the current time |
365 | * | |
366 | * Set the current time in a logininfo structure. This function is | |
367 | * meant to eliminate the need to deal with system dependencies for | |
368 | * time handling. | |
369 | */ | |
1d7b9b20 | 370 | void |
564dd50a | 371 | login_set_current_time(struct logininfo *li) |
372 | { | |
1d7b9b20 | 373 | struct timeval tv; |
374 | ||
375 | gettimeofday(&tv, NULL); | |
d8caae24 | 376 | |
377 | li->tv_sec = tv.tv_sec; | |
378 | li->tv_usec = tv.tv_usec; | |
1d7b9b20 | 379 | } |
380 | ||
564dd50a | 381 | /* copy a sockaddr_* into our logininfo */ |
1d7b9b20 | 382 | void |
564dd50a | 383 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, |
384 | const unsigned int sa_size) | |
385 | { | |
386 | unsigned int bufsize = sa_size; | |
387 | ||
388 | /* make sure we don't overrun our union */ | |
389 | if (sizeof(li->hostaddr) < sa_size) | |
390 | bufsize = sizeof(li->hostaddr); | |
391 | ||
392 | memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize); | |
1d7b9b20 | 393 | } |
1d7b9b20 | 394 | |
564dd50a | 395 | |
396 | /** | |
397 | ** login_write: Call low-level recording functions based on autoconf | |
398 | ** results | |
399 | **/ | |
1d7b9b20 | 400 | int |
564dd50a | 401 | login_write (struct logininfo *li) |
402 | { | |
1d7b9b20 | 403 | if ((int)geteuid() != 0) { |
404 | log("Attempt to write login records by non-root user (aborting)"); | |
405 | return 1; | |
406 | } | |
a05a70ab | 407 | |
1d7b9b20 | 408 | /* set the timestamp */ |
409 | login_set_current_time(li); | |
410 | #ifdef USE_LOGIN | |
411 | syslogin_write_entry(li); | |
412 | #endif | |
413 | #ifdef USE_LASTLOG | |
414 | if (li->type == LTYPE_LOGIN) { | |
415 | lastlog_write_entry(li); | |
416 | } | |
417 | #endif | |
418 | #ifdef USE_UTMP | |
419 | utmp_write_entry(li); | |
420 | #endif | |
421 | #ifdef USE_WTMP | |
422 | wtmp_write_entry(li); | |
423 | #endif | |
424 | #ifdef USE_UTMPX | |
425 | utmpx_write_entry(li); | |
426 | #endif | |
427 | #ifdef USE_WTMPX | |
428 | wtmpx_write_entry(li); | |
429 | #endif | |
430 | return 0; | |
431 | } | |
432 | ||
564dd50a | 433 | /** |
434 | ** getlast_entry: Call low-level functions to retrieve the last login | |
435 | ** time. | |
436 | **/ | |
1d7b9b20 | 437 | |
564dd50a | 438 | /* take the uid in li and return the last login time */ |
1d7b9b20 | 439 | int |
564dd50a | 440 | getlast_entry(struct logininfo *li) |
441 | { | |
442 | #ifdef USE_LASTLOG | |
9f32ceb4 | 443 | return(lastlog_get_entry(li)); |
a05a70ab | 444 | #else /* !USE_LASTLOG */ |
1d7b9b20 | 445 | |
a05a70ab | 446 | #ifdef DISABLE_LASTLOG |
3f45f1c3 | 447 | /* On some systems we shouldn't even try to obtain last login |
448 | * time, e.g. AIX */ | |
449 | return 0; | |
a05a70ab | 450 | # else /* DISABLE_LASTLOG */ |
564dd50a | 451 | /* Try to retrieve the last login time from wtmp */ |
a05a70ab | 452 | # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) |
564dd50a | 453 | /* retrieve last login time from utmp */ |
a05a70ab | 454 | return (wtmp_get_entry(li)); |
455 | # else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */ | |
564dd50a | 456 | /* If wtmp isn't available, try wtmpx */ |
a05a70ab | 457 | # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) |
564dd50a | 458 | /* retrieve last login time from utmpx */ |
a05a70ab | 459 | return (wtmpx_get_entry(li)); |
460 | # else | |
564dd50a | 461 | /* Give up: No means of retrieving last login time */ |
462 | return 0; | |
a05a70ab | 463 | # endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */ |
464 | # endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */ | |
465 | # endif /* DISABLE_LASTLOG */ | |
466 | #endif /* USE_LASTLOG */ | |
564dd50a | 467 | } |
1d7b9b20 | 468 | |
469 | ||
1d7b9b20 | 470 | |
471 | /* | |
564dd50a | 472 | * 'line' string utility functions |
473 | * | |
474 | * These functions process the 'line' string into one of three forms: | |
475 | * | |
1d7b9b20 | 476 | * 1. The full filename (including '/dev') |
477 | * 2. The stripped name (excluding '/dev') | |
564dd50a | 478 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 |
479 | * /dev/pts/1 -> ts/1 ) | |
1d7b9b20 | 480 | * |
481 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
482 | * attempting to remove it. Typically both addition and removal is | |
564dd50a | 483 | * performed by one application - say, sshd - so as long as the choice |
484 | * uniquely identifies a terminal it's ok. | |
1d7b9b20 | 485 | */ |
486 | ||
487 | ||
564dd50a | 488 | /* line_fullname(): add the leading '/dev/' if it doesn't exist make |
489 | * sure dst has enough space, if not just copy src (ugh) */ | |
1d7b9b20 | 490 | char * |
564dd50a | 491 | line_fullname(char *dst, const char *src, int dstsize) |
492 | { | |
1d7b9b20 | 493 | memset(dst, '\0', dstsize); |
494 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) | |
495 | strlcpy(dst, src, dstsize); | |
496 | else { | |
a4d05724 | 497 | strlcpy(dst, "/dev/", dstsize); |
1d7b9b20 | 498 | strlcat(dst, src, dstsize); |
499 | } | |
500 | return dst; | |
501 | } | |
502 | ||
564dd50a | 503 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ |
1d7b9b20 | 504 | char * |
564dd50a | 505 | line_stripname(char *dst, const char *src, int dstsize) |
506 | { | |
1d7b9b20 | 507 | memset(dst, '\0', dstsize); |
508 | if (strncmp(src, "/dev/", 5) == 0) | |
509 | strlcpy(dst, &src[5], dstsize); | |
510 | else | |
511 | strlcpy(dst, src, dstsize); | |
512 | return dst; | |
564dd50a | 513 | } |
514 | ||
564dd50a | 515 | /* line_abbrevname(): Return the abbreviated (usually four-character) |
516 | * form of the line (Just use the last <dstsize> characters of the | |
517 | * full name.) | |
518 | * | |
519 | * NOTE: use strncpy because we do NOT necessarily want zero | |
520 | * termination */ | |
1d7b9b20 | 521 | char * |
a05a70ab | 522 | line_abbrevname(char *dst, const char *src, int dstsize) |
523 | { | |
524 | size_t len; | |
525 | ||
1d7b9b20 | 526 | memset(dst, '\0', dstsize); |
a05a70ab | 527 | |
daaff4d5 | 528 | /* Always skip prefix if present */ |
529 | if (strncmp(src, "/dev/", 5) == 0) | |
530 | src += 5; | |
531 | ||
a05a70ab | 532 | len = strlen(src); |
533 | ||
daaff4d5 | 534 | if (len > 0) { |
535 | if (((int)len - dstsize) > 0) | |
536 | src += ((int)len - dstsize); | |
537 | ||
538 | /* note: _don't_ change this to strlcpy */ | |
539 | strncpy(dst, src, (size_t)dstsize); | |
a05a70ab | 540 | } |
541 | ||
1d7b9b20 | 542 | return dst; |
543 | } | |
544 | ||
1d7b9b20 | 545 | /** |
546 | ** utmp utility functions | |
564dd50a | 547 | ** |
548 | ** These functions manipulate struct utmp, taking system differences | |
549 | ** into account. | |
1d7b9b20 | 550 | **/ |
551 | ||
552 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
553 | ||
1d7b9b20 | 554 | /* build the utmp structure */ |
555 | void | |
564dd50a | 556 | set_utmp_time(struct logininfo *li, struct utmp *ut) |
557 | { | |
a05a70ab | 558 | # ifdef HAVE_TV_IN_UTMP |
1d7b9b20 | 559 | ut->ut_tv.tv_sec = li->tv_sec; |
560 | ut->ut_tv.tv_usec = li->tv_usec; | |
a05a70ab | 561 | # else |
1d7b9b20 | 562 | # ifdef HAVE_TIME_IN_UTMP |
563 | ut->ut_time = li->tv_sec; | |
564 | # endif | |
a05a70ab | 565 | # endif |
1d7b9b20 | 566 | } |
567 | ||
568 | void | |
569 | construct_utmp(struct logininfo *li, | |
564dd50a | 570 | struct utmp *ut) |
571 | { | |
1d7b9b20 | 572 | memset(ut, '\0', sizeof(struct utmp)); |
5abcdf8e | 573 | |
574 | /* First fill out fields used for both logins and logouts */ | |
575 | ||
a05a70ab | 576 | # ifdef HAVE_ID_IN_UTMP |
1d7b9b20 | 577 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); |
a05a70ab | 578 | # endif |
1d7b9b20 | 579 | |
a05a70ab | 580 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 581 | /* This is done here to keep utmp constants out of struct logininfo */ |
1d7b9b20 | 582 | switch (li->type) { |
583 | case LTYPE_LOGIN: | |
584 | ut->ut_type = USER_PROCESS; | |
585 | break; | |
586 | case LTYPE_LOGOUT: | |
587 | ut->ut_type = DEAD_PROCESS; | |
588 | break; | |
589 | } | |
a05a70ab | 590 | # endif |
5abcdf8e | 591 | set_utmp_time(li, ut); |
1d7b9b20 | 592 | |
5abcdf8e | 593 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); |
a05a70ab | 594 | |
595 | # ifdef HAVE_PID_IN_UTMP | |
1d7b9b20 | 596 | ut->ut_pid = li->pid; |
a05a70ab | 597 | # endif |
5abcdf8e | 598 | |
599 | /* If we're logging out, leave all other fields blank */ | |
600 | if (li->type == LTYPE_LOGOUT) | |
601 | return; | |
602 | ||
a05a70ab | 603 | /* |
604 | * These fields are only used when logging in, and are blank | |
605 | * for logouts. | |
606 | */ | |
5abcdf8e | 607 | |
608 | /* Use strncpy because we don't necessarily want null termination */ | |
dc2a6d09 | 609 | strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username)); |
a05a70ab | 610 | # ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 611 | strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname)); |
a05a70ab | 612 | # endif |
613 | # ifdef HAVE_ADDR_IN_UTMP | |
564dd50a | 614 | /* this is just a 32-bit IP address */ |
615 | if (li->hostaddr.sa.sa_family == AF_INET) | |
616 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
a05a70ab | 617 | # endif |
564dd50a | 618 | } |
a05a70ab | 619 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ |
564dd50a | 620 | |
1d7b9b20 | 621 | /** |
622 | ** utmpx utility functions | |
564dd50a | 623 | ** |
624 | ** These functions manipulate struct utmpx, accounting for system | |
625 | ** variations. | |
1d7b9b20 | 626 | **/ |
627 | ||
628 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
1d7b9b20 | 629 | /* build the utmpx structure */ |
630 | void | |
564dd50a | 631 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) |
632 | { | |
a05a70ab | 633 | # ifdef HAVE_TV_IN_UTMPX |
1d7b9b20 | 634 | utx->ut_tv.tv_sec = li->tv_sec; |
635 | utx->ut_tv.tv_usec = li->tv_usec; | |
a05a70ab | 636 | # else /* HAVE_TV_IN_UTMPX */ |
1d7b9b20 | 637 | # ifdef HAVE_TIME_IN_UTMPX |
638 | utx->ut_time = li->tv_sec; | |
a05a70ab | 639 | # endif /* HAVE_TIME_IN_UTMPX */ |
640 | # endif /* HAVE_TV_IN_UTMPX */ | |
1d7b9b20 | 641 | } |
642 | ||
643 | void | |
564dd50a | 644 | construct_utmpx(struct logininfo *li, struct utmpx *utx) |
645 | { | |
1d7b9b20 | 646 | memset(utx, '\0', sizeof(struct utmpx)); |
daaff4d5 | 647 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 648 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); |
daaff4d5 | 649 | # endif |
1d7b9b20 | 650 | |
651 | /* this is done here to keep utmp constants out of loginrec.h */ | |
652 | switch (li->type) { | |
653 | case LTYPE_LOGIN: | |
654 | utx->ut_type = USER_PROCESS; | |
655 | break; | |
656 | case LTYPE_LOGOUT: | |
657 | utx->ut_type = DEAD_PROCESS; | |
658 | break; | |
659 | } | |
1d7b9b20 | 660 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); |
1d7b9b20 | 661 | set_utmpx_time(li, utx); |
5abcdf8e | 662 | utx->ut_pid = li->pid; |
663 | ||
664 | if (li->type == LTYPE_LOGOUT) | |
665 | return; | |
666 | ||
a05a70ab | 667 | /* |
668 | * These fields are only used when logging in, and are blank | |
669 | * for logouts. | |
670 | */ | |
5abcdf8e | 671 | |
672 | /* strncpy(): Don't necessarily want null termination */ | |
dc2a6d09 | 673 | strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username)); |
a05a70ab | 674 | # ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 675 | strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname)); |
a05a70ab | 676 | # endif |
677 | # ifdef HAVE_ADDR_IN_UTMPX | |
564dd50a | 678 | /* FIXME: (ATL) not supported yet */ |
a05a70ab | 679 | # endif |
680 | # ifdef HAVE_SYSLEN_IN_UTMPX | |
5abcdf8e | 681 | /* ut_syslen is the length of the utx_host string */ |
682 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
a05a70ab | 683 | # endif |
564dd50a | 684 | } |
a05a70ab | 685 | #endif /* USE_UTMPX || USE_WTMPX */ |
1d7b9b20 | 686 | |
687 | /** | |
564dd50a | 688 | ** Low-level utmp functions |
1d7b9b20 | 689 | **/ |
690 | ||
691 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
1d7b9b20 | 692 | #ifdef USE_UTMP |
693 | ||
1d7b9b20 | 694 | /* if we can, use pututline() etc. */ |
a05a70ab | 695 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ |
696 | defined(HAVE_PUTUTLINE) | |
1d7b9b20 | 697 | # define UTMP_USE_LIBRARY |
a05a70ab | 698 | # endif |
1d7b9b20 | 699 | |
700 | ||
701 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
a05a70ab | 702 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 703 | static int |
564dd50a | 704 | utmp_write_library(struct logininfo *li, struct utmp *ut) |
705 | { | |
1d7b9b20 | 706 | setutent(); |
707 | pututline(ut); | |
708 | ||
a05a70ab | 709 | # ifdef HAVE_ENDUTENT |
1d7b9b20 | 710 | endutent(); |
a05a70ab | 711 | # endif |
1d7b9b20 | 712 | return 1; |
564dd50a | 713 | } |
a05a70ab | 714 | # else /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 715 | |
716 | /* write a utmp entry direct to the file */ | |
564dd50a | 717 | /* This is a slightly modification of code in OpenBSD's login.c */ |
1d7b9b20 | 718 | static int |
564dd50a | 719 | utmp_write_direct(struct logininfo *li, struct utmp *ut) |
720 | { | |
1d7b9b20 | 721 | struct utmp old_ut; |
722 | register int fd; | |
723 | int tty; | |
724 | ||
5abcdf8e | 725 | /* FIXME: (ATL) ttyslot() needs local implementation */ |
1d7b9b20 | 726 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ |
727 | ||
728 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { | |
729 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
730 | /* | |
731 | * Prevent luser from zero'ing out ut_host. | |
732 | * If the new ut_line is empty but the old one is not | |
dc2a6d09 | 733 | * and ut_line and ut_name match, preserve the old ut_line. |
1d7b9b20 | 734 | */ |
9f32ceb4 | 735 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && |
736 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && | |
737 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
dc2a6d09 | 738 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) { |
1d7b9b20 | 739 | (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); |
9f32ceb4 | 740 | } |
741 | ||
1d7b9b20 | 742 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); |
9f32ceb4 | 743 | if (atomicio(write, fd, ut, sizeof(ut)) != sizeof(ut)) |
1d7b9b20 | 744 | log("utmp_write_direct: error writing %s: %s", |
5abcdf8e | 745 | UTMP_FILE, strerror(errno)); |
1d7b9b20 | 746 | |
747 | (void)close(fd); | |
748 | return 1; | |
9f32ceb4 | 749 | } else { |
1d7b9b20 | 750 | return 0; |
9f32ceb4 | 751 | } |
564dd50a | 752 | } |
a05a70ab | 753 | # endif /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 754 | |
755 | static int | |
564dd50a | 756 | utmp_perform_login(struct logininfo *li) |
757 | { | |
1d7b9b20 | 758 | struct utmp ut; |
759 | ||
760 | construct_utmp(li, &ut); | |
a05a70ab | 761 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 762 | if (!utmp_write_library(li, &ut)) { |
5abcdf8e | 763 | log("utmp_perform_login: utmp_write_library() failed"); |
1d7b9b20 | 764 | return 0; |
765 | } | |
a05a70ab | 766 | # else |
1d7b9b20 | 767 | if (!utmp_write_direct(li, &ut)) { |
768 | log("utmp_perform_login: utmp_write_direct() failed"); | |
769 | return 0; | |
770 | } | |
a05a70ab | 771 | # endif |
1d7b9b20 | 772 | return 1; |
564dd50a | 773 | } |
1d7b9b20 | 774 | |
775 | ||
776 | static int | |
564dd50a | 777 | utmp_perform_logout(struct logininfo *li) |
778 | { | |
1d7b9b20 | 779 | struct utmp ut; |
780 | ||
5abcdf8e | 781 | construct_utmp(li, &ut); |
a05a70ab | 782 | # ifdef UTMP_USE_LIBRARY |
5abcdf8e | 783 | if (!utmp_write_library(li, &ut)) { |
784 | log("utmp_perform_logout: utmp_write_library() failed"); | |
785 | return 0; | |
786 | } | |
a05a70ab | 787 | # else |
5abcdf8e | 788 | if (!utmp_write_direct(li, &ut)) { |
789 | log("utmp_perform_logout: utmp_write_direct() failed"); | |
790 | return 0; | |
791 | } | |
a05a70ab | 792 | # endif |
1d7b9b20 | 793 | return 1; |
564dd50a | 794 | } |
1d7b9b20 | 795 | |
796 | ||
797 | int | |
564dd50a | 798 | utmp_write_entry(struct logininfo *li) |
799 | { | |
1d7b9b20 | 800 | switch(li->type) { |
801 | case LTYPE_LOGIN: | |
802 | return utmp_perform_login(li); | |
803 | ||
804 | case LTYPE_LOGOUT: | |
805 | return utmp_perform_logout(li); | |
806 | ||
807 | default: | |
808 | log("utmp_write_entry: invalid type field"); | |
809 | return 0; | |
810 | } | |
564dd50a | 811 | } |
a05a70ab | 812 | #endif /* USE_UTMP */ |
1d7b9b20 | 813 | |
814 | ||
815 | /** | |
564dd50a | 816 | ** Low-level utmpx functions |
1d7b9b20 | 817 | **/ |
818 | ||
819 | /* not much point if we don't want utmpx entries */ | |
820 | #ifdef USE_UTMPX | |
821 | ||
1d7b9b20 | 822 | /* if we have the wherewithall, use pututxline etc. */ |
a05a70ab | 823 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ |
824 | defined(HAVE_PUTUTXLINE) | |
1d7b9b20 | 825 | # define UTMPX_USE_LIBRARY |
a05a70ab | 826 | # endif |
1d7b9b20 | 827 | |
828 | ||
829 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
a05a70ab | 830 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 831 | static int |
564dd50a | 832 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) |
833 | { | |
1d7b9b20 | 834 | setutxent(); |
835 | pututxline(utx); | |
836 | ||
a05a70ab | 837 | # ifdef HAVE_ENDUTXENT |
1d7b9b20 | 838 | endutxent(); |
a05a70ab | 839 | # endif |
1d7b9b20 | 840 | return 1; |
564dd50a | 841 | } |
1d7b9b20 | 842 | |
a05a70ab | 843 | # else /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 844 | |
845 | /* write a utmp entry direct to the file */ | |
846 | static int | |
564dd50a | 847 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) |
848 | { | |
1d7b9b20 | 849 | log("utmpx_write_direct: not implemented!"); |
850 | return 0; | |
564dd50a | 851 | } |
a05a70ab | 852 | # endif /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 853 | |
854 | static int | |
564dd50a | 855 | utmpx_perform_login(struct logininfo *li) |
856 | { | |
1d7b9b20 | 857 | struct utmpx utx; |
858 | ||
859 | construct_utmpx(li, &utx); | |
a05a70ab | 860 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 861 | if (!utmpx_write_library(li, &utx)) { |
862 | log("utmpx_perform_login: utmp_write_library() failed"); | |
863 | return 0; | |
864 | } | |
a05a70ab | 865 | # else |
1d7b9b20 | 866 | if (!utmpx_write_direct(li, &ut)) { |
867 | log("utmpx_perform_login: utmp_write_direct() failed"); | |
868 | return 0; | |
869 | } | |
a05a70ab | 870 | # endif |
1d7b9b20 | 871 | return 1; |
564dd50a | 872 | } |
1d7b9b20 | 873 | |
874 | ||
875 | static int | |
564dd50a | 876 | utmpx_perform_logout(struct logininfo *li) |
877 | { | |
1d7b9b20 | 878 | struct utmpx utx; |
879 | ||
880 | memset(&utx, '\0', sizeof(utx)); | |
881 | set_utmpx_time(li, &utx); | |
882 | line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line)); | |
a05a70ab | 883 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 884 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); |
a05a70ab | 885 | # endif |
886 | # ifdef HAVE_TYPE_IN_UTMPX | |
1d7b9b20 | 887 | utx.ut_type = DEAD_PROCESS; |
a05a70ab | 888 | # endif |
1d7b9b20 | 889 | |
a05a70ab | 890 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 891 | utmpx_write_library(li, &utx); |
a05a70ab | 892 | # else |
1d7b9b20 | 893 | utmpx_write_direct(li, &utx); |
a05a70ab | 894 | # endif |
1d7b9b20 | 895 | return 1; |
564dd50a | 896 | } |
1d7b9b20 | 897 | |
1d7b9b20 | 898 | int |
564dd50a | 899 | utmpx_write_entry(struct logininfo *li) |
900 | { | |
1d7b9b20 | 901 | switch(li->type) { |
902 | case LTYPE_LOGIN: | |
903 | return utmpx_perform_login(li); | |
904 | case LTYPE_LOGOUT: | |
905 | return utmpx_perform_logout(li); | |
906 | default: | |
907 | log("utmpx_write_entry: invalid type field"); | |
908 | return 0; | |
909 | } | |
564dd50a | 910 | } |
a05a70ab | 911 | #endif /* USE_UTMPX */ |
1d7b9b20 | 912 | |
913 | ||
914 | /** | |
564dd50a | 915 | ** Low-level wtmp functions |
1d7b9b20 | 916 | **/ |
917 | ||
918 | #ifdef USE_WTMP | |
919 | ||
1d7b9b20 | 920 | /* write a wtmp entry direct to the end of the file */ |
564dd50a | 921 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 922 | static int |
564dd50a | 923 | wtmp_write(struct logininfo *li, struct utmp *ut) |
924 | { | |
1d7b9b20 | 925 | struct stat buf; |
926 | int fd, ret = 1; | |
927 | ||
928 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
929 | log("wtmp_write: problem writing %s: %s", | |
930 | WTMP_FILE, strerror(errno)); | |
931 | return 0; | |
932 | } | |
564dd50a | 933 | if (fstat(fd, &buf) == 0) |
9f32ceb4 | 934 | if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) { |
1d7b9b20 | 935 | ftruncate(fd, buf.st_size); |
936 | log("wtmp_write: problem writing %s: %s", | |
937 | WTMP_FILE, strerror(errno)); | |
938 | ret = 0; | |
939 | } | |
940 | (void)close(fd); | |
1d7b9b20 | 941 | return ret; |
564dd50a | 942 | } |
1d7b9b20 | 943 | |
1d7b9b20 | 944 | static int |
a05a70ab | 945 | wtmp_perform_login(struct logininfo *li) |
946 | { | |
1d7b9b20 | 947 | struct utmp ut; |
948 | ||
949 | construct_utmp(li, &ut); | |
950 | return wtmp_write(li, &ut); | |
564dd50a | 951 | } |
1d7b9b20 | 952 | |
953 | ||
954 | static int | |
564dd50a | 955 | wtmp_perform_logout(struct logininfo *li) |
956 | { | |
1d7b9b20 | 957 | struct utmp ut; |
958 | ||
959 | construct_utmp(li, &ut); | |
1d7b9b20 | 960 | return wtmp_write(li, &ut); |
564dd50a | 961 | } |
1d7b9b20 | 962 | |
963 | ||
964 | int | |
564dd50a | 965 | wtmp_write_entry(struct logininfo *li) |
966 | { | |
1d7b9b20 | 967 | switch(li->type) { |
968 | case LTYPE_LOGIN: | |
969 | return wtmp_perform_login(li); | |
970 | case LTYPE_LOGOUT: | |
971 | return wtmp_perform_logout(li); | |
972 | default: | |
973 | log("wtmp_write_entry: invalid type field"); | |
974 | return 0; | |
975 | } | |
564dd50a | 976 | } |
1d7b9b20 | 977 | |
978 | ||
5abcdf8e | 979 | /* Notes on fetching login data from wtmp/wtmpx |
980 | * | |
981 | * Logouts are usually recorded with (amongst other things) a blank | |
982 | * username on a given tty line. However, some systems (HP-UX is one) | |
983 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
984 | * | |
985 | * Since we're only looking for logins here, we know that the username | |
986 | * must be set correctly. On systems that leave it in, we check for | |
987 | * ut_type==USER_PROCESS (indicating a login.) | |
988 | * | |
989 | * Portability: Some systems may set something other than USER_PROCESS | |
990 | * to indicate a login process. I don't know of any as I write. Also, | |
991 | * it's possible that some systems may both leave the username in | |
992 | * place and not have ut_type. | |
993 | */ | |
994 | ||
5abcdf8e | 995 | /* return true if this wtmp entry indicates a login */ |
996 | static int | |
997 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
998 | { | |
dc2a6d09 | 999 | if (strncmp(li->username, ut->ut_name, |
1000 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { | |
a05a70ab | 1001 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 1002 | if (ut->ut_type & USER_PROCESS) |
1003 | return 1; | |
a05a70ab | 1004 | # else |
5abcdf8e | 1005 | return 1; |
a05a70ab | 1006 | # endif |
5abcdf8e | 1007 | } |
1008 | return 0; | |
1009 | } | |
1010 | ||
1d7b9b20 | 1011 | int |
564dd50a | 1012 | wtmp_get_entry(struct logininfo *li) |
1013 | { | |
1d7b9b20 | 1014 | struct stat st; |
1015 | struct utmp ut; | |
5abcdf8e | 1016 | int fd, found=0; |
1017 | ||
1018 | /* Clear the time entries in our logininfo */ | |
1019 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1020 | |
1021 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
1022 | log("wtmp_get_entry: problem opening %s: %s", | |
1023 | WTMP_FILE, strerror(errno)); | |
1024 | return 0; | |
1025 | } | |
564dd50a | 1026 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1027 | log("wtmp_get_entry: couldn't stat %s: %s", |
1028 | WTMP_FILE, strerror(errno)); | |
1029 | close(fd); | |
1030 | return 0; | |
1031 | } | |
1d7b9b20 | 1032 | |
5abcdf8e | 1033 | /* Seek to the start of the last struct utmp */ |
1034 | if (lseek(fd, (off_t)(0-sizeof(struct utmp)), SEEK_END) == -1) { | |
1035 | /* Looks like we've got a fresh wtmp file */ | |
1036 | close(fd); | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | while (!found) { | |
9f32ceb4 | 1041 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { |
1d7b9b20 | 1042 | log("wtmp_get_entry: read of %s failed: %s", |
1043 | WTMP_FILE, strerror(errno)); | |
1044 | close (fd); | |
1045 | return 0; | |
1046 | } | |
5abcdf8e | 1047 | if ( wtmp_islogin(li, &ut) ) { |
1048 | found = 1; | |
1049 | /* We've already checked for a time in struct | |
1050 | * utmp, in login_getlast(). */ | |
a05a70ab | 1051 | # ifdef HAVE_TIME_IN_UTMP |
1d7b9b20 | 1052 | li->tv_sec = ut.ut_time; |
a05a70ab | 1053 | # else |
1d7b9b20 | 1054 | # if HAVE_TV_IN_UTMP |
1055 | li->tv_sec = ut.ut_tv.tv_sec; | |
1056 | # endif | |
a05a70ab | 1057 | # endif |
5abcdf8e | 1058 | line_fullname(li->line, ut.ut_line, |
1059 | MIN_SIZEOF(li->line, ut.ut_line)); | |
a05a70ab | 1060 | # ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 1061 | strlcpy(li->hostname, ut.ut_host, |
1062 | MIN_SIZEOF(li->hostname, ut.ut_host)); | |
a05a70ab | 1063 | # endif |
5abcdf8e | 1064 | continue; |
1d7b9b20 | 1065 | } |
5abcdf8e | 1066 | /* Seek back 2 x struct utmp */ |
1d7b9b20 | 1067 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) { |
5abcdf8e | 1068 | /* We've found the start of the file, so quit */ |
1d7b9b20 | 1069 | close (fd); |
1070 | return 0; | |
1071 | } | |
5abcdf8e | 1072 | } |
1073 | ||
1074 | /* We found an entry. Tidy up and return */ | |
1075 | close(fd); | |
1d7b9b20 | 1076 | return 1; |
564dd50a | 1077 | } |
a05a70ab | 1078 | # endif /* USE_WTMP */ |
1d7b9b20 | 1079 | |
1080 | ||
1081 | /** | |
564dd50a | 1082 | ** Low-level wtmpx functions |
1d7b9b20 | 1083 | **/ |
1084 | ||
1085 | #ifdef USE_WTMPX | |
1d7b9b20 | 1086 | /* write a wtmpx entry direct to the end of the file */ |
564dd50a | 1087 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 1088 | static int |
564dd50a | 1089 | wtmpx_write(struct logininfo *li, struct utmpx *utx) |
1090 | { | |
1d7b9b20 | 1091 | struct stat buf; |
1092 | int fd, ret = 1; | |
1093 | ||
1094 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1095 | log("wtmpx_write: problem opening %s: %s", | |
1096 | WTMPX_FILE, strerror(errno)); | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | if (fstat(fd, &buf) == 0) | |
9f32ceb4 | 1101 | if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) { |
1d7b9b20 | 1102 | ftruncate(fd, buf.st_size); |
1103 | log("wtmpx_write: problem writing %s: %s", | |
1104 | WTMPX_FILE, strerror(errno)); | |
1105 | ret = 0; | |
1106 | } | |
1107 | (void)close(fd); | |
1108 | ||
1109 | return ret; | |
564dd50a | 1110 | } |
1d7b9b20 | 1111 | |
1112 | ||
1113 | static int | |
564dd50a | 1114 | wtmpx_perform_login(struct logininfo *li) |
1115 | { | |
1d7b9b20 | 1116 | struct utmpx utx; |
1117 | ||
1118 | construct_utmpx(li, &utx); | |
1119 | return wtmpx_write(li, &utx); | |
564dd50a | 1120 | } |
1d7b9b20 | 1121 | |
1122 | ||
1123 | static int | |
564dd50a | 1124 | wtmpx_perform_logout(struct logininfo *li) |
1125 | { | |
1d7b9b20 | 1126 | struct utmpx utx; |
1127 | ||
1128 | construct_utmpx(li, &utx); | |
1d7b9b20 | 1129 | return wtmpx_write(li, &utx); |
564dd50a | 1130 | } |
1d7b9b20 | 1131 | |
1132 | ||
1133 | int | |
564dd50a | 1134 | wtmpx_write_entry(struct logininfo *li) |
1135 | { | |
1d7b9b20 | 1136 | switch(li->type) { |
1137 | case LTYPE_LOGIN: | |
1138 | return wtmpx_perform_login(li); | |
1139 | case LTYPE_LOGOUT: | |
1140 | return wtmpx_perform_logout(li); | |
1141 | default: | |
1142 | log("wtmpx_write_entry: invalid type field"); | |
1143 | return 0; | |
1144 | } | |
564dd50a | 1145 | } |
1d7b9b20 | 1146 | |
5abcdf8e | 1147 | /* Please see the notes above wtmp_islogin() for information about the |
1148 | next two functions */ | |
1149 | ||
1150 | /* Return true if this wtmpx entry indicates a login */ | |
1151 | static int | |
1152 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1153 | { | |
dc2a6d09 | 1154 | if ( strncmp(li->username, utx->ut_name, |
1155 | MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) { | |
a05a70ab | 1156 | # ifdef HAVE_TYPE_IN_UTMPX |
5abcdf8e | 1157 | if (utx->ut_type == USER_PROCESS) |
1158 | return 1; | |
a05a70ab | 1159 | # else |
5abcdf8e | 1160 | return 1; |
a05a70ab | 1161 | # endif |
5abcdf8e | 1162 | } |
1163 | return 0; | |
1164 | } | |
1165 | ||
1d7b9b20 | 1166 | |
1167 | int | |
564dd50a | 1168 | wtmpx_get_entry(struct logininfo *li) |
1169 | { | |
1d7b9b20 | 1170 | struct stat st; |
1171 | struct utmpx utx; | |
5abcdf8e | 1172 | int fd, found=0; |
1173 | ||
1174 | /* Clear the time entries */ | |
1175 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1176 | |
1177 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1178 | log("wtmpx_get_entry: problem opening %s: %s", | |
1179 | WTMPX_FILE, strerror(errno)); | |
1180 | return 0; | |
1181 | } | |
564dd50a | 1182 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1183 | log("wtmpx_get_entry: couldn't stat %s: %s", |
1184 | WTMP_FILE, strerror(errno)); | |
1185 | close(fd); | |
1186 | return 0; | |
1187 | } | |
5abcdf8e | 1188 | |
1189 | /* Seek to the start of the last struct utmpx */ | |
1190 | if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) { | |
1191 | /* probably a newly rotated wtmpx file */ | |
1192 | close(fd); | |
1193 | return 0; | |
1194 | } | |
1d7b9b20 | 1195 | |
5abcdf8e | 1196 | while (!found) { |
9f32ceb4 | 1197 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { |
1d7b9b20 | 1198 | log("wtmpx_get_entry: read of %s failed: %s", |
1199 | WTMPX_FILE, strerror(errno)); | |
1200 | close (fd); | |
1201 | return 0; | |
1202 | } | |
1d7b9b20 | 1203 | /* Logouts are recorded as a blank username on a particular line. |
1204 | * So, we just need to find the username in struct utmpx */ | |
5abcdf8e | 1205 | if ( wtmpx_islogin(li, &utx) ) { |
a05a70ab | 1206 | # ifdef HAVE_TV_IN_UTMPX |
1d7b9b20 | 1207 | li->tv_sec = utx.ut_tv.tv_sec; |
a05a70ab | 1208 | # else |
1d7b9b20 | 1209 | # ifdef HAVE_TIME_IN_UTMPX |
1210 | li->tv_sec = utx.ut_time; | |
1211 | # endif | |
a05a70ab | 1212 | # endif |
a4d05724 | 1213 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); |
a05a70ab | 1214 | # ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 1215 | strlcpy(li->hostname, utx.ut_host, |
1216 | MIN_SIZEOF(li->hostname, utx.ut_host)); | |
a05a70ab | 1217 | # endif |
5abcdf8e | 1218 | continue; |
1d7b9b20 | 1219 | } |
1220 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1221 | close (fd); | |
1222 | return 0; | |
1223 | } | |
5abcdf8e | 1224 | } |
1225 | ||
1226 | close(fd); | |
1d7b9b20 | 1227 | return 1; |
564dd50a | 1228 | } |
f988dce5 | 1229 | #endif /* USE_WTMPX */ |
1d7b9b20 | 1230 | |
1d7b9b20 | 1231 | /** |
564dd50a | 1232 | ** Low-level libutil login() functions |
1d7b9b20 | 1233 | **/ |
1234 | ||
1235 | #ifdef USE_LOGIN | |
1d7b9b20 | 1236 | static int |
564dd50a | 1237 | syslogin_perform_login(struct logininfo *li) |
1238 | { | |
1d7b9b20 | 1239 | struct utmp *ut; |
1240 | ||
1241 | if (! (ut = (struct utmp *)malloc(sizeof(struct utmp)))) { | |
1242 | log("syslogin_perform_login: couldn't malloc()"); | |
1243 | return 0; | |
1244 | } | |
1245 | construct_utmp(li, ut); | |
1246 | login(ut); | |
1247 | ||
1248 | return 1; | |
564dd50a | 1249 | } |
1d7b9b20 | 1250 | |
564dd50a | 1251 | static int |
1252 | syslogin_perform_logout(struct logininfo *li) | |
1253 | { | |
a05a70ab | 1254 | # ifdef HAVE_LOGOUT |
1d7b9b20 | 1255 | char line[8]; |
1256 | ||
1257 | (void)line_stripname(line, li->line, sizeof(line)); | |
1258 | ||
1259 | if (!logout(line)) { | |
1260 | log("syslogin_perform_logout: logout() returned an error"); | |
a05a70ab | 1261 | # ifdef HAVE_LOGWTMP |
1d7b9b20 | 1262 | } else { |
1263 | logwtmp(line, "", ""); | |
a05a70ab | 1264 | # endif |
5637650d | 1265 | } |
5abcdf8e | 1266 | /* FIXME: (ATL - if the need arises) What to do if we have |
1267 | * login, but no logout? what if logout but no logwtmp? All | |
1268 | * routines are in libutil so they should all be there, | |
1269 | * but... */ | |
a05a70ab | 1270 | # endif |
1d7b9b20 | 1271 | return 1; |
564dd50a | 1272 | } |
1d7b9b20 | 1273 | |
1d7b9b20 | 1274 | int |
564dd50a | 1275 | syslogin_write_entry(struct logininfo *li) |
1276 | { | |
1d7b9b20 | 1277 | switch (li->type) { |
1278 | case LTYPE_LOGIN: | |
1279 | return syslogin_perform_login(li); | |
1280 | case LTYPE_LOGOUT: | |
1281 | return syslogin_perform_logout(li); | |
1282 | default: | |
1283 | log("syslogin_write_entry: Invalid type field"); | |
1284 | return 0; | |
1285 | } | |
564dd50a | 1286 | } |
f988dce5 | 1287 | #endif /* USE_LOGIN */ |
1d7b9b20 | 1288 | |
1289 | /* end of file log-syslogin.c */ | |
1290 | ||
1d7b9b20 | 1291 | /** |
564dd50a | 1292 | ** Low-level lastlog functions |
1d7b9b20 | 1293 | **/ |
1294 | ||
1295 | #ifdef USE_LASTLOG | |
a05a70ab | 1296 | #define LL_FILE 1 |
1297 | #define LL_DIR 2 | |
1298 | #define LL_OTHER 3 | |
1d7b9b20 | 1299 | |
1d7b9b20 | 1300 | static void |
564dd50a | 1301 | lastlog_construct(struct logininfo *li, struct lastlog *last) |
1302 | { | |
1d7b9b20 | 1303 | /* clear the structure */ |
1304 | memset(last, '\0', sizeof(struct lastlog)); | |
1305 | ||
a05a70ab | 1306 | (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line)); |
5abcdf8e | 1307 | strlcpy(last->ll_host, li->hostname, |
1308 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1d7b9b20 | 1309 | last->ll_time = li->tv_sec; |
564dd50a | 1310 | } |
1d7b9b20 | 1311 | |
1d7b9b20 | 1312 | static int |
564dd50a | 1313 | lastlog_filetype(char *filename) |
1314 | { | |
1d7b9b20 | 1315 | struct stat st; |
1316 | ||
a05a70ab | 1317 | if (stat(LASTLOG_FILE, &st) != 0) { |
1318 | log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE, | |
1319 | strerror(errno)); | |
1d7b9b20 | 1320 | return 0; |
1321 | } | |
1d7b9b20 | 1322 | if (S_ISDIR(st.st_mode)) |
1323 | return LL_DIR; | |
1324 | else if (S_ISREG(st.st_mode)) | |
1325 | return LL_FILE; | |
1326 | else | |
1327 | return LL_OTHER; | |
564dd50a | 1328 | } |
1d7b9b20 | 1329 | |
1330 | ||
1331 | /* open the file (using filemode) and seek to the login entry */ | |
1332 | static int | |
564dd50a | 1333 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) |
1334 | { | |
1d7b9b20 | 1335 | off_t offset; |
1336 | int type; | |
1337 | char lastlog_file[1024]; | |
1338 | ||
1339 | type = lastlog_filetype(LASTLOG_FILE); | |
1340 | switch (type) { | |
d8caae24 | 1341 | case LL_FILE: |
1342 | strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); | |
1343 | break; | |
1344 | case LL_DIR: | |
1345 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1346 | LASTLOG_FILE, li->username); | |
1347 | break; | |
1348 | default: | |
1349 | log("lastlog_openseek: %.100s is not a file or directory!", | |
1350 | LASTLOG_FILE); | |
1351 | return 0; | |
a05a70ab | 1352 | } |
1d7b9b20 | 1353 | |
1354 | *fd = open(lastlog_file, filemode); | |
1355 | if ( *fd < 0) { | |
9f32ceb4 | 1356 | debug("lastlog_openseek: Couldn't open %s: %s", |
1d7b9b20 | 1357 | lastlog_file, strerror(errno)); |
1358 | return 0; | |
1359 | } | |
a05a70ab | 1360 | |
1d7b9b20 | 1361 | /* find this uid's offset in the lastlog file */ |
1362 | offset = (off_t) ( (long)li->uid * sizeof(struct lastlog)); | |
1363 | ||
1364 | if ( lseek(*fd, offset, SEEK_SET) != offset ) { | |
1365 | log("lastlog_openseek: %s->lseek(): %s", | |
1366 | lastlog_file, strerror(errno)); | |
1367 | return 0; | |
1368 | } | |
1369 | return 1; | |
564dd50a | 1370 | } |
1d7b9b20 | 1371 | |
1372 | static int | |
564dd50a | 1373 | lastlog_perform_login(struct logininfo *li) |
1374 | { | |
1d7b9b20 | 1375 | struct lastlog last; |
1376 | int fd; | |
1377 | ||
1378 | /* create our struct lastlog */ | |
1379 | lastlog_construct(li, &last); | |
1380 | ||
1381 | /* write the entry */ | |
9f32ceb4 | 1382 | if (lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) { |
1383 | if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) { | |
1d7b9b20 | 1384 | log("lastlog_write_filemode: Error writing to %s: %s", |
1385 | LASTLOG_FILE, strerror(errno)); | |
1386 | return 0; | |
1387 | } | |
1388 | return 1; | |
a05a70ab | 1389 | } else { |
1d7b9b20 | 1390 | return 0; |
a05a70ab | 1391 | } |
564dd50a | 1392 | } |
1d7b9b20 | 1393 | |
1d7b9b20 | 1394 | int |
564dd50a | 1395 | lastlog_write_entry(struct logininfo *li) |
1396 | { | |
1d7b9b20 | 1397 | switch(li->type) { |
1398 | case LTYPE_LOGIN: | |
1399 | return lastlog_perform_login(li); | |
1400 | default: | |
1401 | log("lastlog_write_entry: Invalid type field"); | |
1402 | return 0; | |
1403 | } | |
564dd50a | 1404 | } |
1d7b9b20 | 1405 | |
1d7b9b20 | 1406 | static void |
564dd50a | 1407 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) |
1408 | { | |
1d7b9b20 | 1409 | line_fullname(li->line, last->ll_line, sizeof(li->line)); |
a05a70ab | 1410 | strlcpy(li->hostname, last->ll_host, |
5abcdf8e | 1411 | MIN_SIZEOF(li->hostname, last->ll_host)); |
1d7b9b20 | 1412 | li->tv_sec = last->ll_time; |
564dd50a | 1413 | } |
1d7b9b20 | 1414 | |
1d7b9b20 | 1415 | int |
564dd50a | 1416 | lastlog_get_entry(struct logininfo *li) |
1417 | { | |
1d7b9b20 | 1418 | struct lastlog last; |
1419 | int fd; | |
1420 | ||
1421 | if (lastlog_openseek(li, &fd, O_RDONLY)) { | |
9f32ceb4 | 1422 | if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) { |
1423 | log("lastlog_get_entry: Error reading from %s: %s", | |
1d7b9b20 | 1424 | LASTLOG_FILE, strerror(errno)); |
1425 | return 0; | |
1426 | } else { | |
1427 | lastlog_populate_entry(li, &last); | |
1428 | return 1; | |
1429 | } | |
a05a70ab | 1430 | } else { |
1d7b9b20 | 1431 | return 0; |
a05a70ab | 1432 | } |
564dd50a | 1433 | } |
f988dce5 | 1434 | #endif /* USE_LASTLOG */ |