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. 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 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 49/** 50 ** loginrec.c: platform-independent login recording and lastlog retrieval 51 **/ 52 53/* 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 */ 147 148#include "includes.h" 149 150#include <sys/types.h> 151#include <sys/stat.h> 152#include <sys/socket.h> 153#ifdef HAVE_SYS_TIME_H 154# include <sys/time.h> 155#endif 156 157#include <netinet/in.h> 158 159#include <errno.h> 160#include <fcntl.h> 161#ifdef HAVE_PATHS_H 162# include <paths.h> 163#endif 164#include <pwd.h> 165#include <stdarg.h> 166#include <string.h> 167#include <time.h> 168#include <unistd.h> 169 170#include "xmalloc.h" 171#include "sshkey.h" 172#include "hostfile.h" 173#include "ssh.h" 174#include "loginrec.h" 175#include "log.h" 176#include "atomicio.h" 177#include "packet.h" 178#include "canohost.h" 179#include "auth.h" 180#include "sshbuf.h" 181#include "ssherr.h" 182 183#ifdef HAVE_UTIL_H 184# include <util.h> 185#endif 186 187/** 188 ** prototypes for helper functions in this file 189 **/ 190 191#if HAVE_UTMP_H 192void set_utmp_time(struct logininfo *li, struct utmp *ut); 193void construct_utmp(struct logininfo *li, struct utmp *ut); 194#endif 195 196#ifdef HAVE_UTMPX_H 197void set_utmpx_time(struct logininfo *li, struct utmpx *ut); 198void construct_utmpx(struct logininfo *li, struct utmpx *ut); 199#endif 200 201int utmp_write_entry(struct logininfo *li); 202int utmpx_write_entry(struct logininfo *li); 203int wtmp_write_entry(struct logininfo *li); 204int wtmpx_write_entry(struct logininfo *li); 205int lastlog_write_entry(struct logininfo *li); 206int syslogin_write_entry(struct logininfo *li); 207 208int getlast_entry(struct logininfo *li); 209int lastlog_get_entry(struct logininfo *li); 210int utmpx_get_entry(struct logininfo *li); 211int wtmp_get_entry(struct logininfo *li); 212int wtmpx_get_entry(struct logininfo *li); 213 214extern struct sshbuf *loginmsg; 215 216/* pick the shortest string */ 217#define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2)) 218 219/** 220 ** platform-independent login functions 221 **/ 222 223/* 224 * login_login(struct logininfo *) - Record a login 225 * 226 * Call with a pointer to a struct logininfo initialised with 227 * login_init_entry() or login_alloc_entry() 228 * 229 * Returns: 230 * >0 if successful 231 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 232 */ 233int 234login_login(struct logininfo *li) 235{ 236 li->type = LTYPE_LOGIN; 237 return (login_write(li)); 238} 239 240 241/* 242 * login_logout(struct logininfo *) - Record a logout 243 * 244 * Call as with login_login() 245 * 246 * Returns: 247 * >0 if successful 248 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 249 */ 250int 251login_logout(struct logininfo *li) 252{ 253 li->type = LTYPE_LOGOUT; 254 return (login_write(li)); 255} 256 257/* 258 * login_get_lastlog_time(int) - Retrieve the last login time 259 * 260 * Retrieve the last login time for the given uid. Will try to use the 261 * system lastlog facilities if they are available, but will fall back 262 * to looking in wtmp/wtmpx if necessary 263 * 264 * Returns: 265 * 0 on failure, or if user has never logged in 266 * Time in seconds from the epoch if successful 267 * 268 * Useful preprocessor symbols: 269 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog 270 * info 271 * USE_LASTLOG: If set, indicates the presence of system lastlog 272 * facilities. If this and DISABLE_LASTLOG are not set, 273 * try to retrieve lastlog information from wtmp/wtmpx. 274 */ 275unsigned int 276login_get_lastlog_time(const uid_t uid) 277{ 278 struct logininfo li; 279 280 if (login_get_lastlog(&li, uid)) 281 return (li.tv_sec); 282 else 283 return (0); 284} 285 286/* 287 * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry 288 * 289 * Retrieve a logininfo structure populated (only partially) with 290 * information from the system lastlog data, or from wtmp/wtmpx if no 291 * system lastlog information exists. 292 * 293 * Note this routine must be given a pre-allocated logininfo. 294 * 295 * Returns: 296 * >0: A pointer to your struct logininfo if successful 297 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 298 */ 299struct logininfo * 300login_get_lastlog(struct logininfo *li, const uid_t uid) 301{ 302 struct passwd *pw; 303 304 memset(li, '\0', sizeof(*li)); 305 li->uid = uid; 306 307 /* 308 * If we don't have a 'real' lastlog, we need the username to 309 * reliably search wtmp(x) for the last login (see 310 * wtmp_get_entry().) 311 */ 312 pw = getpwuid(uid); 313 if (pw == NULL) 314 fatal("%s: Cannot find account for uid %ld", __func__, 315 (long)uid); 316 317 if (strlcpy(li->username, pw->pw_name, sizeof(li->username)) >= 318 sizeof(li->username)) { 319 error("%s: username too long (%lu > max %lu)", __func__, 320 (unsigned long)strlen(pw->pw_name), 321 (unsigned long)sizeof(li->username) - 1); 322 return NULL; 323 } 324 325 if (getlast_entry(li)) 326 return (li); 327 else 328 return (NULL); 329} 330 331/* 332 * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise 333 * a logininfo structure 334 * 335 * This function creates a new struct logininfo, a data structure 336 * meant to carry the information required to portably record login info. 337 * 338 * Returns a pointer to a newly created struct logininfo. If memory 339 * allocation fails, the program halts. 340 */ 341struct 342logininfo *login_alloc_entry(pid_t pid, const char *username, 343 const char *hostname, const char *line) 344{ 345 struct logininfo *newli; 346 347 newli = xmalloc(sizeof(*newli)); 348 login_init_entry(newli, pid, username, hostname, line); 349 return (newli); 350} 351 352 353/* login_free_entry(struct logininfo *) - free struct memory */ 354void 355login_free_entry(struct logininfo *li) 356{ 357 free(li); 358} 359 360 361/* login_init_entry(struct logininfo *, int, char*, char*, char*) 362 * - initialise a struct logininfo 363 * 364 * Populates a new struct logininfo, a data structure meant to carry 365 * the information required to portably record login info. 366 * 367 * Returns: 1 368 */ 369int 370login_init_entry(struct logininfo *li, pid_t pid, const char *username, 371 const char *hostname, const char *line) 372{ 373 struct passwd *pw; 374 375 memset(li, 0, sizeof(*li)); 376 377 li->pid = pid; 378 379 /* set the line information */ 380 if (line) 381 line_fullname(li->line, line, sizeof(li->line)); 382 383 if (username) { 384 strlcpy(li->username, username, sizeof(li->username)); 385 pw = getpwnam(li->username); 386 if (pw == NULL) { 387 fatal("%s: Cannot find user \"%s\"", __func__, 388 li->username); 389 } 390 li->uid = pw->pw_uid; 391 } 392 393 if (hostname) 394 strlcpy(li->hostname, hostname, sizeof(li->hostname)); 395 396 return (1); 397} 398 399/* 400 * login_set_current_time(struct logininfo *) - set the current time 401 * 402 * Set the current time in a logininfo structure. This function is 403 * meant to eliminate the need to deal with system dependencies for 404 * time handling. 405 */ 406void 407login_set_current_time(struct logininfo *li) 408{ 409 struct timeval tv; 410 411 gettimeofday(&tv, NULL); 412 413 li->tv_sec = tv.tv_sec; 414 li->tv_usec = tv.tv_usec; 415} 416 417/* copy a sockaddr_* into our logininfo */ 418void 419login_set_addr(struct logininfo *li, const struct sockaddr *sa, 420 const unsigned int sa_size) 421{ 422 unsigned int bufsize = sa_size; 423 424 /* make sure we don't overrun our union */ 425 if (sizeof(li->hostaddr) < sa_size) 426 bufsize = sizeof(li->hostaddr); 427 428 memcpy(&li->hostaddr.sa, sa, bufsize); 429} 430 431 432/** 433 ** login_write: Call low-level recording functions based on autoconf 434 ** results 435 **/ 436int 437login_write(struct logininfo *li) 438{ 439#ifndef HAVE_CYGWIN 440 if (geteuid() != 0) { 441 logit("Attempt to write login records by non-root user (aborting)"); 442 return (1); 443 } 444#endif 445 446 /* set the timestamp */ 447 login_set_current_time(li); 448#ifdef USE_LOGIN 449 syslogin_write_entry(li); 450#endif 451#ifdef USE_LASTLOG 452 if (li->type == LTYPE_LOGIN) 453 lastlog_write_entry(li); 454#endif 455#ifdef USE_UTMP 456 utmp_write_entry(li); 457#endif 458#ifdef USE_WTMP 459 wtmp_write_entry(li); 460#endif 461#ifdef USE_UTMPX 462 utmpx_write_entry(li); 463#endif 464#ifdef USE_WTMPX 465 wtmpx_write_entry(li); 466#endif 467#ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN 468 if (li->type == LTYPE_LOGIN && 469 !sys_auth_record_login(li->username,li->hostname,li->line, 470 &loginmsg)) 471 logit("Writing login record failed for %s", li->username); 472#endif 473#ifdef SSH_AUDIT_EVENTS 474 if (li->type == LTYPE_LOGIN) 475 audit_session_open(li); 476 else if (li->type == LTYPE_LOGOUT) 477 audit_session_close(li); 478#endif 479 return (0); 480} 481 482#ifdef LOGIN_NEEDS_UTMPX 483int 484login_utmp_only(struct logininfo *li) 485{ 486 li->type = LTYPE_LOGIN; 487 login_set_current_time(li); 488# ifdef USE_UTMP 489 utmp_write_entry(li); 490# endif 491# ifdef USE_WTMP 492 wtmp_write_entry(li); 493# endif 494# ifdef USE_UTMPX 495 utmpx_write_entry(li); 496# endif 497# ifdef USE_WTMPX 498 wtmpx_write_entry(li); 499# endif 500 return (0); 501} 502#endif 503 504/** 505 ** getlast_entry: Call low-level functions to retrieve the last login 506 ** time. 507 **/ 508 509/* take the uid in li and return the last login time */ 510int 511getlast_entry(struct logininfo *li) 512{ 513#ifdef USE_LASTLOG 514 return(lastlog_get_entry(li)); 515#else /* !USE_LASTLOG */ 516#if defined(USE_UTMPX) && defined(HAVE_SETUTXDB) && \ 517 defined(UTXDB_LASTLOGIN) && defined(HAVE_GETUTXUSER) 518 return (utmpx_get_entry(li)); 519#endif 520 521#if defined(DISABLE_LASTLOG) 522 /* On some systems we shouldn't even try to obtain last login 523 * time, e.g. AIX */ 524 return (0); 525# elif defined(USE_WTMP) && \ 526 (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) 527 /* retrieve last login time from utmp */ 528 return (wtmp_get_entry(li)); 529# elif defined(USE_WTMPX) && \ 530 (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) 531 /* If wtmp isn't available, try wtmpx */ 532 return (wtmpx_get_entry(li)); 533# else 534 /* Give up: No means of retrieving last login time */ 535 return (0); 536# endif /* DISABLE_LASTLOG */ 537#endif /* USE_LASTLOG */ 538} 539 540 541 542/* 543 * 'line' string utility functions 544 * 545 * These functions process the 'line' string into one of three forms: 546 * 547 * 1. The full filename (including '/dev') 548 * 2. The stripped name (excluding '/dev') 549 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 550 * /dev/pts/1 -> ts/1 ) 551 * 552 * Form 3 is used on some systems to identify a .tmp.? entry when 553 * attempting to remove it. Typically both addition and removal is 554 * performed by one application - say, sshd - so as long as the choice 555 * uniquely identifies a terminal it's ok. 556 */ 557 558 559/* 560 * line_fullname(): add the leading '/dev/' if it doesn't exist make 561 * sure dst has enough space, if not just copy src (ugh) 562 */ 563char * 564line_fullname(char *dst, const char *src, u_int dstsize) 565{ 566 memset(dst, '\0', dstsize); 567 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) 568 strlcpy(dst, src, dstsize); 569 else { 570 strlcpy(dst, "/dev/", dstsize); 571 strlcat(dst, src, dstsize); 572 } 573 return (dst); 574} 575 576/* line_stripname(): strip the leading '/dev' if it exists, return dst */ 577char * 578line_stripname(char *dst, const char *src, int dstsize) 579{ 580 memset(dst, '\0', dstsize); 581 if (strncmp(src, "/dev/", 5) == 0) 582 strlcpy(dst, src + 5, dstsize); 583 else 584 strlcpy(dst, src, dstsize); 585 return (dst); 586} 587 588/* 589 * line_abbrevname(): Return the abbreviated (usually four-character) 590 * form of the line (Just use the last <dstsize> characters of the 591 * full name.) 592 * 593 * NOTE: use strncpy because we do NOT necessarily want zero 594 * termination 595 */ 596char * 597line_abbrevname(char *dst, const char *src, int dstsize) 598{ 599 size_t len; 600 601 memset(dst, '\0', dstsize); 602 603 /* Always skip prefix if present */ 604 if (strncmp(src, "/dev/", 5) == 0) 605 src += 5; 606 607#ifdef WITH_ABBREV_NO_TTY 608 if (strncmp(src, "tty", 3) == 0) 609 src += 3; 610#endif 611 612 len = strlen(src); 613 614 if (len > 0) { 615 if (((int)len - dstsize) > 0) 616 src += ((int)len - dstsize); 617 618 /* note: _don't_ change this to strlcpy */ 619 strncpy(dst, src, (size_t)dstsize); 620 } 621 622 return (dst); 623} 624 625/** 626 ** utmp utility functions 627 ** 628 ** These functions manipulate struct utmp, taking system differences 629 ** into account. 630 **/ 631 632#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) 633 634/* build the utmp structure */ 635void 636set_utmp_time(struct logininfo *li, struct utmp *ut) 637{ 638# if defined(HAVE_TV_IN_UTMP) 639 ut->ut_tv.tv_sec = li->tv_sec; 640 ut->ut_tv.tv_usec = li->tv_usec; 641# elif defined(HAVE_TIME_IN_UTMP) 642 ut->ut_time = li->tv_sec; 643# endif 644} 645 646void 647construct_utmp(struct logininfo *li, 648 struct utmp *ut) 649{ 650# ifdef HAVE_ADDR_V6_IN_UTMP 651 struct sockaddr_in6 *sa6; 652# endif 653 654 memset(ut, '\0', sizeof(*ut)); 655 656 /* First fill out fields used for both logins and logouts */ 657 658# ifdef HAVE_ID_IN_UTMP 659 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); 660# endif 661 662# ifdef HAVE_TYPE_IN_UTMP 663 /* This is done here to keep utmp constants out of struct logininfo */ 664 switch (li->type) { 665 case LTYPE_LOGIN: 666 ut->ut_type = USER_PROCESS; 667 break; 668 case LTYPE_LOGOUT: 669 ut->ut_type = DEAD_PROCESS; 670 break; 671 } 672# endif 673 set_utmp_time(li, ut); 674 675 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); 676 677# ifdef HAVE_PID_IN_UTMP 678 ut->ut_pid = li->pid; 679# endif 680 681 /* If we're logging out, leave all other fields blank */ 682 if (li->type == LTYPE_LOGOUT) 683 return; 684 685 /* 686 * These fields are only used when logging in, and are blank 687 * for logouts. 688 */ 689 690 /* Use strncpy because we don't necessarily want null termination */ 691 strncpy(ut->ut_name, li->username, 692 MIN_SIZEOF(ut->ut_name, li->username)); 693# ifdef HAVE_HOST_IN_UTMP 694 strncpy(ut->ut_host, li->hostname, 695 MIN_SIZEOF(ut->ut_host, li->hostname)); 696# endif 697# ifdef HAVE_ADDR_IN_UTMP 698 /* this is just a 32-bit IP address */ 699 if (li->hostaddr.sa.sa_family == AF_INET) 700 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; 701# endif 702# ifdef HAVE_ADDR_V6_IN_UTMP 703 /* this is just a 128-bit IPv6 address */ 704 if (li->hostaddr.sa.sa_family == AF_INET6) { 705 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); 706 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); 707 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { 708 ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; 709 ut->ut_addr_v6[1] = 0; 710 ut->ut_addr_v6[2] = 0; 711 ut->ut_addr_v6[3] = 0; 712 } 713 } 714# endif 715} 716#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ 717 718/** 719 ** utmpx utility functions 720 ** 721 ** These functions manipulate struct utmpx, accounting for system 722 ** variations. 723 **/ 724 725#if defined(USE_UTMPX) || defined (USE_WTMPX) 726/* build the utmpx structure */ 727void 728set_utmpx_time(struct logininfo *li, struct utmpx *utx) 729{ 730# if defined(HAVE_TV_IN_UTMPX) 731 utx->ut_tv.tv_sec = li->tv_sec; 732 utx->ut_tv.tv_usec = li->tv_usec; 733# elif defined(HAVE_TIME_IN_UTMPX) 734 utx->ut_time = li->tv_sec; 735# endif 736} 737 738void 739construct_utmpx(struct logininfo *li, struct utmpx *utx) 740{ 741# ifdef HAVE_ADDR_V6_IN_UTMP 742 struct sockaddr_in6 *sa6; 743# endif 744 memset(utx, '\0', sizeof(*utx)); 745 746# ifdef HAVE_ID_IN_UTMPX 747 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); 748# endif 749 750 /* this is done here to keep utmp constants out of loginrec.h */ 751 switch (li->type) { 752 case LTYPE_LOGIN: 753 utx->ut_type = USER_PROCESS; 754 break; 755 case LTYPE_LOGOUT: 756 utx->ut_type = DEAD_PROCESS; 757 break; 758 } 759 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); 760 set_utmpx_time(li, utx); 761 utx->ut_pid = li->pid; 762 763 /* strncpy(): Don't necessarily want null termination */ 764 strncpy(utx->ut_user, li->username, 765 MIN_SIZEOF(utx->ut_user, li->username)); 766 767 if (li->type == LTYPE_LOGOUT) 768 return; 769 770 /* 771 * These fields are only used when logging in, and are blank 772 * for logouts. 773 */ 774 775# ifdef HAVE_HOST_IN_UTMPX 776 strncpy(utx->ut_host, li->hostname, 777 MIN_SIZEOF(utx->ut_host, li->hostname)); 778# endif 779# ifdef HAVE_ADDR_IN_UTMPX 780 /* this is just a 32-bit IP address */ 781 if (li->hostaddr.sa.sa_family == AF_INET) 782 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; 783# endif 784# ifdef HAVE_ADDR_V6_IN_UTMP 785 /* this is just a 128-bit IPv6 address */ 786 if (li->hostaddr.sa.sa_family == AF_INET6) { 787 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); 788 memcpy(utx->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); 789 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { 790 utx->ut_addr_v6[0] = utx->ut_addr_v6[3]; 791 utx->ut_addr_v6[1] = 0; 792 utx->ut_addr_v6[2] = 0; 793 utx->ut_addr_v6[3] = 0; 794 } 795 } 796# endif 797# ifdef HAVE_SYSLEN_IN_UTMPX 798 /* ut_syslen is the length of the utx_host string */ 799 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); 800# endif 801} 802#endif /* USE_UTMPX || USE_WTMPX */ 803 804/** 805 ** Low-level utmp functions 806 **/ 807 808/* FIXME: (ATL) utmp_write_direct needs testing */ 809#ifdef USE_UTMP 810 811/* if we can, use pututline() etc. */ 812# if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ 813 defined(HAVE_PUTUTLINE) 814# define UTMP_USE_LIBRARY 815# endif 816 817 818/* write a utmp entry with the system's help (pututline() and pals) */ 819# ifdef UTMP_USE_LIBRARY 820static int 821utmp_write_library(struct logininfo *li, struct utmp *ut) 822{ 823 setutent(); 824 pututline(ut); 825# ifdef HAVE_ENDUTENT 826 endutent(); 827# endif 828 return (1); 829} 830# else /* UTMP_USE_LIBRARY */ 831 832/* 833 * Write a utmp entry direct to the file 834 * This is a slightly modification of code in OpenBSD's login.c 835 */ 836static int 837utmp_write_direct(struct logininfo *li, struct utmp *ut) 838{ 839 struct utmp old_ut; 840 register int fd; 841 int tty; 842 843 /* FIXME: (ATL) ttyslot() needs local implementation */ 844 845#if defined(HAVE_GETTTYENT) 846 struct ttyent *ty; 847 848 tty=0; 849 setttyent(); 850 while (NULL != (ty = getttyent())) { 851 tty++; 852 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) 853 break; 854 } 855 endttyent(); 856 857 if (NULL == ty) { 858 logit("%s: tty not found", __func__); 859 return (0); 860 } 861#else /* FIXME */ 862 863 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ 864 865#endif /* HAVE_GETTTYENT */ 866 867 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { 868 off_t pos, ret; 869 870 pos = (off_t)tty * sizeof(struct utmp); 871 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { 872 logit("%s: lseek: %s", __func__, strerror(errno)); 873 close(fd); 874 return (0); 875 } 876 if (ret != pos) { 877 logit("%s: Couldn't seek to tty %d slot in %s", 878 __func__, tty, UTMP_FILE); 879 close(fd); 880 return (0); 881 } 882 /* 883 * Prevent luser from zero'ing out ut_host. 884 * If the new ut_line is empty but the old one is not 885 * and ut_line and ut_name match, preserve the old ut_line. 886 */ 887 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && 888 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && 889 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && 890 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) 891 memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); 892 893 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { 894 logit("%s: lseek: %s", __func__, strerror(errno)); 895 close(fd); 896 return (0); 897 } 898 if (ret != pos) { 899 logit("%s: Couldn't seek to tty %d slot in %s", 900 __func__, tty, UTMP_FILE); 901 close(fd); 902 return (0); 903 } 904 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { 905 logit("%s: error writing %s: %s", __func__, 906 UTMP_FILE, strerror(errno)); 907 close(fd); 908 return (0); 909 } 910 911 close(fd); 912 return (1); 913 } else { 914 return (0); 915 } 916} 917# endif /* UTMP_USE_LIBRARY */ 918 919static int 920utmp_perform_login(struct logininfo *li) 921{ 922 struct utmp ut; 923 924 construct_utmp(li, &ut); 925# ifdef UTMP_USE_LIBRARY 926 if (!utmp_write_library(li, &ut)) { 927 logit("%s: utmp_write_library() failed", __func__); 928 return (0); 929 } 930# else 931 if (!utmp_write_direct(li, &ut)) { 932 logit("%s: utmp_write_direct() failed", __func__); 933 return (0); 934 } 935# endif 936 return (1); 937} 938 939 940static int 941utmp_perform_logout(struct logininfo *li) 942{ 943 struct utmp ut; 944 945 construct_utmp(li, &ut); 946# ifdef UTMP_USE_LIBRARY 947 if (!utmp_write_library(li, &ut)) { 948 logit("%s: utmp_write_library() failed", __func__); 949 return (0); 950 } 951# else 952 if (!utmp_write_direct(li, &ut)) { 953 logit("%s: utmp_write_direct() failed", __func__); 954 return (0); 955 } 956# endif 957 return (1); 958} 959 960 961int 962utmp_write_entry(struct logininfo *li) 963{ 964 switch(li->type) { 965 case LTYPE_LOGIN: 966 return (utmp_perform_login(li)); 967 968 case LTYPE_LOGOUT: 969 return (utmp_perform_logout(li)); 970 971 default: 972 logit("%s: invalid type field", __func__); 973 return (0); 974 } 975} 976#endif /* USE_UTMP */ 977 978 979/** 980 ** Low-level utmpx functions 981 **/ 982 983/* not much point if we don't want utmpx entries */ 984#ifdef USE_UTMPX 985 986/* if we have the wherewithall, use pututxline etc. */ 987# if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ 988 defined(HAVE_PUTUTXLINE) 989# define UTMPX_USE_LIBRARY 990# endif 991 992 993/* write a utmpx entry with the system's help (pututxline() and pals) */ 994# ifdef UTMPX_USE_LIBRARY 995static int 996utmpx_write_library(struct logininfo *li, struct utmpx *utx) 997{ 998 setutxent(); 999 pututxline(utx); 1000 1001# ifdef HAVE_ENDUTXENT 1002 endutxent(); 1003# endif 1004 return (1); 1005} 1006 1007# else /* UTMPX_USE_LIBRARY */ 1008 1009/* write a utmp entry direct to the file */ 1010static int 1011utmpx_write_direct(struct logininfo *li, struct utmpx *utx) 1012{ 1013 logit("%s: not implemented!", __func__); 1014 return (0); 1015} 1016# endif /* UTMPX_USE_LIBRARY */ 1017 1018static int 1019utmpx_perform_login(struct logininfo *li) 1020{ 1021 struct utmpx utx; 1022 1023 construct_utmpx(li, &utx); 1024# ifdef UTMPX_USE_LIBRARY 1025 if (!utmpx_write_library(li, &utx)) { 1026 logit("%s: utmp_write_library() failed", __func__); 1027 return (0); 1028 } 1029# else 1030 if (!utmpx_write_direct(li, &ut)) { 1031 logit("%s: utmp_write_direct() failed", __func__); 1032 return (0); 1033 } 1034# endif 1035 return (1); 1036} 1037 1038 1039static int 1040utmpx_perform_logout(struct logininfo *li) 1041{ 1042 struct utmpx utx; 1043 1044 construct_utmpx(li, &utx); 1045# ifdef HAVE_ID_IN_UTMPX 1046 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); 1047# endif 1048# ifdef HAVE_TYPE_IN_UTMPX 1049 utx.ut_type = DEAD_PROCESS; 1050# endif 1051 1052# ifdef UTMPX_USE_LIBRARY 1053 utmpx_write_library(li, &utx); 1054# else 1055 utmpx_write_direct(li, &utx); 1056# endif 1057 return (1); 1058} 1059 1060int 1061utmpx_write_entry(struct logininfo *li) 1062{ 1063 switch(li->type) { 1064 case LTYPE_LOGIN: 1065 return (utmpx_perform_login(li)); 1066 case LTYPE_LOGOUT: 1067 return (utmpx_perform_logout(li)); 1068 default: 1069 logit("%s: invalid type field", __func__); 1070 return (0); 1071 } 1072} 1073#endif /* USE_UTMPX */ 1074 1075 1076/** 1077 ** Low-level wtmp functions 1078 **/ 1079 1080#ifdef USE_WTMP 1081 1082/* 1083 * Write a wtmp entry direct to the end of the file 1084 * This is a slight modification of code in OpenBSD's logwtmp.c 1085 */ 1086static int 1087wtmp_write(struct logininfo *li, struct utmp *ut) 1088{ 1089 struct stat buf; 1090 int fd, ret = 1; 1091 1092 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { 1093 logit("%s: problem writing %s: %s", __func__, 1094 WTMP_FILE, strerror(errno)); 1095 return (0); 1096 } 1097 if (fstat(fd, &buf) == 0) 1098 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { 1099 ftruncate(fd, buf.st_size); 1100 logit("%s: problem writing %s: %s", __func__, 1101 WTMP_FILE, strerror(errno)); 1102 ret = 0; 1103 } 1104 close(fd); 1105 return (ret); 1106} 1107 1108static int 1109wtmp_perform_login(struct logininfo *li) 1110{ 1111 struct utmp ut; 1112 1113 construct_utmp(li, &ut); 1114 return (wtmp_write(li, &ut)); 1115} 1116 1117 1118static int 1119wtmp_perform_logout(struct logininfo *li) 1120{ 1121 struct utmp ut; 1122 1123 construct_utmp(li, &ut); 1124 return (wtmp_write(li, &ut)); 1125} 1126 1127 1128int 1129wtmp_write_entry(struct logininfo *li) 1130{ 1131 switch(li->type) { 1132 case LTYPE_LOGIN: 1133 return (wtmp_perform_login(li)); 1134 case LTYPE_LOGOUT: 1135 return (wtmp_perform_logout(li)); 1136 default: 1137 logit("%s: invalid type field", __func__); 1138 return (0); 1139 } 1140} 1141 1142 1143/* 1144 * Notes on fetching login data from wtmp/wtmpx 1145 * 1146 * Logouts are usually recorded with (amongst other things) a blank 1147 * username on a given tty line. However, some systems (HP-UX is one) 1148 * leave all fields set, but change the ut_type field to DEAD_PROCESS. 1149 * 1150 * Since we're only looking for logins here, we know that the username 1151 * must be set correctly. On systems that leave it in, we check for 1152 * ut_type==USER_PROCESS (indicating a login.) 1153 * 1154 * Portability: Some systems may set something other than USER_PROCESS 1155 * to indicate a login process. I don't know of any as I write. Also, 1156 * it's possible that some systems may both leave the username in 1157 * place and not have ut_type. 1158 */ 1159 1160/* return true if this wtmp entry indicates a login */ 1161static int 1162wtmp_islogin(struct logininfo *li, struct utmp *ut) 1163{ 1164 if (strncmp(li->username, ut->ut_name, 1165 MIN_SIZEOF(li->username, ut->ut_name)) == 0) { 1166# ifdef HAVE_TYPE_IN_UTMP 1167 if (ut->ut_type & USER_PROCESS) 1168 return (1); 1169# else 1170 return (1); 1171# endif 1172 } 1173 return (0); 1174} 1175 1176int 1177wtmp_get_entry(struct logininfo *li) 1178{ 1179 struct stat st; 1180 struct utmp ut; 1181 int fd, found = 0; 1182 1183 /* Clear the time entries in our logininfo */ 1184 li->tv_sec = li->tv_usec = 0; 1185 1186 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { 1187 logit("%s: problem opening %s: %s", __func__, 1188 WTMP_FILE, strerror(errno)); 1189 return (0); 1190 } 1191 if (fstat(fd, &st) != 0) { 1192 logit("%s: couldn't stat %s: %s", __func__, 1193 WTMP_FILE, strerror(errno)); 1194 close(fd); 1195 return (0); 1196 } 1197 1198 /* Seek to the start of the last struct utmp */ 1199 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) { 1200 /* Looks like we've got a fresh wtmp file */ 1201 close(fd); 1202 return (0); 1203 } 1204 1205 while (!found) { 1206 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { 1207 logit("%s: read of %s failed: %s", __func__, 1208 WTMP_FILE, strerror(errno)); 1209 close (fd); 1210 return (0); 1211 } 1212 if (wtmp_islogin(li, &ut) ) { 1213 found = 1; 1214 /* 1215 * We've already checked for a time in struct 1216 * utmp, in login_getlast() 1217 */ 1218# ifdef HAVE_TIME_IN_UTMP 1219 li->tv_sec = ut.ut_time; 1220# else 1221# if HAVE_TV_IN_UTMP 1222 li->tv_sec = ut.ut_tv.tv_sec; 1223# endif 1224# endif 1225 line_fullname(li->line, ut.ut_line, 1226 MIN_SIZEOF(li->line, ut.ut_line)); 1227# ifdef HAVE_HOST_IN_UTMP 1228 strlcpy(li->hostname, ut.ut_host, 1229 MIN_SIZEOF(li->hostname, ut.ut_host)); 1230# endif 1231 continue; 1232 } 1233 /* Seek back 2 x struct utmp */ 1234 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) { 1235 /* We've found the start of the file, so quit */ 1236 close(fd); 1237 return (0); 1238 } 1239 } 1240 1241 /* We found an entry. Tidy up and return */ 1242 close(fd); 1243 return (1); 1244} 1245# endif /* USE_WTMP */ 1246 1247 1248/** 1249 ** Low-level wtmpx functions 1250 **/ 1251 1252#ifdef USE_WTMPX 1253/* 1254 * Write a wtmpx entry direct to the end of the file 1255 * This is a slight modification of code in OpenBSD's logwtmp.c 1256 */ 1257static int 1258wtmpx_write(struct logininfo *li, struct utmpx *utx) 1259{ 1260#ifndef HAVE_UPDWTMPX 1261 struct stat buf; 1262 int fd, ret = 1; 1263 1264 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { 1265 logit("%s: problem opening %s: %s", __func__, 1266 WTMPX_FILE, strerror(errno)); 1267 return (0); 1268 } 1269 1270 if (fstat(fd, &buf) == 0) 1271 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) { 1272 ftruncate(fd, buf.st_size); 1273 logit("%s: problem writing %s: %s", __func__, 1274 WTMPX_FILE, strerror(errno)); 1275 ret = 0; 1276 } 1277 close(fd); 1278 1279 return (ret); 1280#else 1281 updwtmpx(WTMPX_FILE, utx); 1282 return (1); 1283#endif 1284} 1285 1286 1287static int 1288wtmpx_perform_login(struct logininfo *li) 1289{ 1290 struct utmpx utx; 1291 1292 construct_utmpx(li, &utx); 1293 return (wtmpx_write(li, &utx)); 1294} 1295 1296 1297static int 1298wtmpx_perform_logout(struct logininfo *li) 1299{ 1300 struct utmpx utx; 1301 1302 construct_utmpx(li, &utx); 1303 return (wtmpx_write(li, &utx)); 1304} 1305 1306 1307int 1308wtmpx_write_entry(struct logininfo *li) 1309{ 1310 switch(li->type) { 1311 case LTYPE_LOGIN: 1312 return (wtmpx_perform_login(li)); 1313 case LTYPE_LOGOUT: 1314 return (wtmpx_perform_logout(li)); 1315 default: 1316 logit("%s: invalid type field", __func__); 1317 return (0); 1318 } 1319} 1320 1321/* Please see the notes above wtmp_islogin() for information about the 1322 next two functions */ 1323 1324/* Return true if this wtmpx entry indicates a login */ 1325static int 1326wtmpx_islogin(struct logininfo *li, struct utmpx *utx) 1327{ 1328 if (strncmp(li->username, utx->ut_user, 1329 MIN_SIZEOF(li->username, utx->ut_user)) == 0 ) { 1330# ifdef HAVE_TYPE_IN_UTMPX 1331 if (utx->ut_type == USER_PROCESS) 1332 return (1); 1333# else 1334 return (1); 1335# endif 1336 } 1337 return (0); 1338} 1339 1340 1341int 1342wtmpx_get_entry(struct logininfo *li) 1343{ 1344 struct stat st; 1345 struct utmpx utx; 1346 int fd, found=0; 1347 1348 /* Clear the time entries */ 1349 li->tv_sec = li->tv_usec = 0; 1350 1351 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { 1352 logit("%s: problem opening %s: %s", __func__, 1353 WTMPX_FILE, strerror(errno)); 1354 return (0); 1355 } 1356 if (fstat(fd, &st) != 0) { 1357 logit("%s: couldn't stat %s: %s", __func__, 1358 WTMPX_FILE, strerror(errno)); 1359 close(fd); 1360 return (0); 1361 } 1362 1363 /* Seek to the start of the last struct utmpx */ 1364 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) { 1365 /* probably a newly rotated wtmpx file */ 1366 close(fd); 1367 return (0); 1368 } 1369 1370 while (!found) { 1371 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { 1372 logit("%s: read of %s failed: %s", __func__, 1373 WTMPX_FILE, strerror(errno)); 1374 close (fd); 1375 return (0); 1376 } 1377 /* 1378 * Logouts are recorded as a blank username on a particular 1379 * line. So, we just need to find the username in struct utmpx 1380 */ 1381 if (wtmpx_islogin(li, &utx)) { 1382 found = 1; 1383# if defined(HAVE_TV_IN_UTMPX) 1384 li->tv_sec = utx.ut_tv.tv_sec; 1385# elif defined(HAVE_TIME_IN_UTMPX) 1386 li->tv_sec = utx.ut_time; 1387# endif 1388 line_fullname(li->line, utx.ut_line, sizeof(li->line)); 1389# if defined(HAVE_HOST_IN_UTMPX) 1390 strlcpy(li->hostname, utx.ut_host, 1391 MIN_SIZEOF(li->hostname, utx.ut_host)); 1392# endif 1393 continue; 1394 } 1395 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) { 1396 close(fd); 1397 return (0); 1398 } 1399 } 1400 1401 close(fd); 1402 return (1); 1403} 1404#endif /* USE_WTMPX */ 1405 1406/** 1407 ** Low-level libutil login() functions 1408 **/ 1409 1410#ifdef USE_LOGIN 1411static int 1412syslogin_perform_login(struct logininfo *li) 1413{ 1414 struct utmp *ut; 1415 1416 ut = xmalloc(sizeof(*ut)); 1417 construct_utmp(li, ut); 1418 login(ut); 1419 free(ut); 1420 1421 return (1); 1422} 1423 1424static int 1425syslogin_perform_logout(struct logininfo *li) 1426{ 1427# ifdef HAVE_LOGOUT 1428 char line[UT_LINESIZE]; 1429 1430 (void)line_stripname(line, li->line, sizeof(line)); 1431 1432 if (!logout(line)) 1433 logit("%s: logout() returned an error", __func__); 1434# ifdef HAVE_LOGWTMP 1435 else 1436 logwtmp(line, "", ""); 1437# endif 1438 /* FIXME: (ATL - if the need arises) What to do if we have 1439 * login, but no logout? what if logout but no logwtmp? All 1440 * routines are in libutil so they should all be there, 1441 * but... */ 1442# endif 1443 return (1); 1444} 1445 1446int 1447syslogin_write_entry(struct logininfo *li) 1448{ 1449 switch (li->type) { 1450 case LTYPE_LOGIN: 1451 return (syslogin_perform_login(li)); 1452 case LTYPE_LOGOUT: 1453 return (syslogin_perform_logout(li)); 1454 default: 1455 logit("%s: Invalid type field", __func__); 1456 return (0); 1457 } 1458} 1459#endif /* USE_LOGIN */ 1460 1461/* end of file log-syslogin.c */ 1462 1463/** 1464 ** Low-level lastlog functions 1465 **/ 1466 1467#ifdef USE_LASTLOG 1468 1469#if !defined(LASTLOG_WRITE_PUTUTXLINE) || !defined(HAVE_GETLASTLOGXBYNAME) 1470/* open the file (using filemode) and seek to the login entry */ 1471static int 1472lastlog_openseek(struct logininfo *li, int *fd, int filemode) 1473{ 1474 off_t offset; 1475 char lastlog_file[1024]; 1476 struct stat st; 1477 1478 if (stat(LASTLOG_FILE, &st) != 0) { 1479 logit("%s: Couldn't stat %s: %s", __func__, 1480 LASTLOG_FILE, strerror(errno)); 1481 return (0); 1482 } 1483 if (S_ISDIR(st.st_mode)) { 1484 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", 1485 LASTLOG_FILE, li->username); 1486 } else if (S_ISREG(st.st_mode)) { 1487 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); 1488 } else { 1489 logit("%s: %.100s is not a file or directory!", __func__, 1490 LASTLOG_FILE); 1491 return (0); 1492 } 1493 1494 *fd = open(lastlog_file, filemode, 0600); 1495 if (*fd < 0) { 1496 debug("%s: Couldn't open %s: %s", __func__, 1497 lastlog_file, strerror(errno)); 1498 return (0); 1499 } 1500 1501 if (S_ISREG(st.st_mode)) { 1502 /* find this uid's offset in the lastlog file */ 1503 offset = (off_t) ((u_long)li->uid * sizeof(struct lastlog)); 1504 1505 if (lseek(*fd, offset, SEEK_SET) != offset) { 1506 logit("%s: %s->lseek(): %s", __func__, 1507 lastlog_file, strerror(errno)); 1508 close(*fd); 1509 return (0); 1510 } 1511 } 1512 1513 return (1); 1514} 1515#endif /* !LASTLOG_WRITE_PUTUTXLINE || !HAVE_GETLASTLOGXBYNAME */ 1516 1517#ifdef LASTLOG_WRITE_PUTUTXLINE 1518int 1519lastlog_write_entry(struct logininfo *li) 1520{ 1521 switch(li->type) { 1522 case LTYPE_LOGIN: 1523 return 1; /* lastlog written by pututxline */ 1524 default: 1525 logit("lastlog_write_entry: Invalid type field"); 1526 return 0; 1527 } 1528} 1529#else /* LASTLOG_WRITE_PUTUTXLINE */ 1530int 1531lastlog_write_entry(struct logininfo *li) 1532{ 1533 struct lastlog last; 1534 int fd; 1535 1536 switch(li->type) { 1537 case LTYPE_LOGIN: 1538 /* create our struct lastlog */ 1539 memset(&last, '\0', sizeof(last)); 1540 line_stripname(last.ll_line, li->line, sizeof(last.ll_line)); 1541 strlcpy(last.ll_host, li->hostname, 1542 MIN_SIZEOF(last.ll_host, li->hostname)); 1543 last.ll_time = li->tv_sec; 1544 1545 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) 1546 return (0); 1547 1548 /* write the entry */ 1549 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) { 1550 close(fd); 1551 logit("%s: Error writing to %s: %s", __func__, 1552 LASTLOG_FILE, strerror(errno)); 1553 return (0); 1554 } 1555 1556 close(fd); 1557 return (1); 1558 default: 1559 logit("%s: Invalid type field", __func__); 1560 return (0); 1561 } 1562} 1563#endif /* LASTLOG_WRITE_PUTUTXLINE */ 1564 1565#ifdef HAVE_GETLASTLOGXBYNAME 1566int 1567lastlog_get_entry(struct logininfo *li) 1568{ 1569 struct lastlogx l, *ll; 1570 1571 if ((ll = getlastlogxbyname(li->username, &l)) == NULL) { 1572 memset(&l, '\0', sizeof(l)); 1573 ll = &l; 1574 } 1575 line_fullname(li->line, ll->ll_line, sizeof(li->line)); 1576 strlcpy(li->hostname, ll->ll_host, 1577 MIN_SIZEOF(li->hostname, ll->ll_host)); 1578 li->tv_sec = ll->ll_tv.tv_sec; 1579 li->tv_usec = ll->ll_tv.tv_usec; 1580 return (1); 1581} 1582#else /* HAVE_GETLASTLOGXBYNAME */ 1583int 1584lastlog_get_entry(struct logininfo *li) 1585{ 1586 struct lastlog last; 1587 int fd, ret; 1588 1589 if (!lastlog_openseek(li, &fd, O_RDONLY)) 1590 return (0); 1591 1592 ret = atomicio(read, fd, &last, sizeof(last)); 1593 close(fd); 1594 1595 switch (ret) { 1596 case 0: 1597 memset(&last, '\0', sizeof(last)); 1598 /* FALLTHRU */ 1599 case sizeof(last): 1600 line_fullname(li->line, last.ll_line, sizeof(li->line)); 1601 strlcpy(li->hostname, last.ll_host, 1602 MIN_SIZEOF(li->hostname, last.ll_host)); 1603 li->tv_sec = last.ll_time; 1604 return (1); 1605 case -1: 1606 error("%s: Error reading from %s: %s", __func__, 1607 LASTLOG_FILE, strerror(errno)); 1608 return (0); 1609 default: 1610 error("%s: Error reading from %s: Expecting %d, got %d", 1611 __func__, LASTLOG_FILE, (int)sizeof(last), ret); 1612 return (0); 1613 } 1614 1615 /* NOTREACHED */ 1616 return (0); 1617} 1618#endif /* HAVE_GETLASTLOGXBYNAME */ 1619#endif /* USE_LASTLOG */ 1620 1621#if defined(USE_UTMPX) && defined(HAVE_SETUTXDB) && \ 1622 defined(UTXDB_LASTLOGIN) && defined(HAVE_GETUTXUSER) 1623int 1624utmpx_get_entry(struct logininfo *li) 1625{ 1626 struct utmpx *utx; 1627 1628 if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) 1629 return (0); 1630 utx = getutxuser(li->username); 1631 if (utx == NULL) { 1632 endutxent(); 1633 return (0); 1634 } 1635 1636 line_fullname(li->line, utx->ut_line, 1637 MIN_SIZEOF(li->line, utx->ut_line)); 1638 strlcpy(li->hostname, utx->ut_host, 1639 MIN_SIZEOF(li->hostname, utx->ut_host)); 1640 li->tv_sec = utx->ut_tv.tv_sec; 1641 li->tv_usec = utx->ut_tv.tv_usec; 1642 endutxent(); 1643 return (1); 1644} 1645#endif /* USE_UTMPX && HAVE_SETUTXDB && UTXDB_LASTLOGIN && HAVE_GETUTXUSER */ 1646 1647#ifdef USE_BTMP 1648 /* 1649 * Logs failed login attempts in _PATH_BTMP if that exists. 1650 * The most common login failure is to give password instead of username. 1651 * So the _PATH_BTMP file checked for the correct permission, so that 1652 * only root can read it. 1653 */ 1654 1655void 1656record_failed_login(const char *username, const char *hostname, 1657 const char *ttyn) 1658{ 1659 int fd; 1660 struct utmp ut; 1661 struct sockaddr_storage from; 1662 socklen_t fromlen = sizeof(from); 1663 struct sockaddr_in *a4; 1664 struct sockaddr_in6 *a6; 1665 time_t t; 1666 struct stat fst; 1667 1668 if (geteuid() != 0) 1669 return; 1670 if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) { 1671 debug("Unable to open the btmp file %s: %s", _PATH_BTMP, 1672 strerror(errno)); 1673 return; 1674 } 1675 if (fstat(fd, &fst) < 0) { 1676 logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP, 1677 strerror(errno)); 1678 goto out; 1679 } 1680 if((fst.st_mode & (S_IXGRP | S_IRWXO)) || (fst.st_uid != 0)){ 1681 logit("Excess permission or bad ownership on file %s", 1682 _PATH_BTMP); 1683 goto out; 1684 } 1685 1686 memset(&ut, 0, sizeof(ut)); 1687 /* strncpy because we don't necessarily want nul termination */ 1688 strncpy(ut.ut_user, username, sizeof(ut.ut_user)); 1689 strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line)); 1690 1691 time(&t); 1692 ut.ut_time = t; /* ut_time is not always a time_t */ 1693 ut.ut_type = LOGIN_PROCESS; 1694 ut.ut_pid = getpid(); 1695 1696 /* strncpy because we don't necessarily want nul termination */ 1697 strncpy(ut.ut_host, hostname, sizeof(ut.ut_host)); 1698 1699 if (packet_connection_is_on_socket() && 1700 getpeername(packet_get_connection_in(), 1701 (struct sockaddr *)&from, &fromlen) == 0) { 1702 ipv64_normalise_mapped(&from, &fromlen); 1703 if (from.ss_family == AF_INET) { 1704 a4 = (struct sockaddr_in *)&from; 1705 memcpy(&ut.ut_addr, &(a4->sin_addr), 1706 MIN_SIZEOF(ut.ut_addr, a4->sin_addr)); 1707 } 1708#ifdef HAVE_ADDR_V6_IN_UTMP 1709 if (from.ss_family == AF_INET6) { 1710 a6 = (struct sockaddr_in6 *)&from; 1711 memcpy(&ut.ut_addr_v6, &(a6->sin6_addr), 1712 MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr)); 1713 } 1714#endif 1715 } 1716 1717 if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut)) 1718 error("Failed to write to %s: %s", _PATH_BTMP, 1719 strerror(errno)); 1720 1721out: 1722 close(fd); 1723} 1724#endif /* USE_BTMP */ 1725