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8efc0c15 | 1 | /* |
6ae2364d | 2 | * |
5260325f | 3 | * login.c |
6ae2364d | 4 | * |
5260325f | 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
6ae2364d | 6 | * |
5260325f | 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
8 | * All rights reserved | |
6ae2364d | 9 | * |
5260325f | 10 | * Created: Fri Mar 24 14:51:08 1995 ylo |
6ae2364d | 11 | * |
5260325f | 12 | * This file performs some of the things login(1) normally does. We cannot |
13 | * easily use something like login -p -h host -f user, because there are | |
14 | * several different logins around, and it is hard to determined what kind of | |
15 | * login the current system has. Also, we want to be able to execute commands | |
16 | * on a tty. | |
6ae2364d | 17 | * |
5260325f | 18 | */ |
8efc0c15 | 19 | |
20 | #include "includes.h" | |
21 | RCSID("$Id$"); | |
22 | ||
92f90c57 | 23 | #if defined(HAVE_UTMPX_H) && defined(USE_UTMPX) |
8946db53 | 24 | # include <utmpx.h> |
25 | #endif | |
26 | #ifdef HAVE_UTMP_H | |
27 | # include <utmp.h> | |
28 | #endif | |
5260325f | 29 | #include "ssh.h" |
4cca272e | 30 | |
5260325f | 31 | #ifdef HAVE_UTIL_H |
32 | # include <util.h> | |
33 | #endif | |
4cca272e | 34 | #ifdef HAVE_LASTLOG_H |
35 | # include <lastlog.h> | |
36 | #endif | |
09041313 | 37 | #ifdef HAVE_LOGIN_H |
38 | # include <login.h> | |
39 | #endif | |
4cca272e | 40 | |
aa3378df | 41 | /* |
42 | * Returns the time when the user last logged in. Returns 0 if the | |
43 | * information is not available. This must be called before record_login. | |
44 | * The host the user logged in from will be returned in buf. | |
45 | */ | |
8efc0c15 | 46 | |
aa3378df | 47 | /* |
48 | * Returns the time when the user last logged in (or 0 if no previous login | |
49 | * is found). The name of the host used last time is returned in buf. | |
50 | */ | |
8efc0c15 | 51 | |
6ae2364d | 52 | unsigned long |
5260325f | 53 | get_last_login_time(uid_t uid, const char *logname, |
54 | char *buf, unsigned int bufsize) | |
8efc0c15 | 55 | { |
ae28776a | 56 | #if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) |
5260325f | 57 | struct lastlog ll; |
58 | char *lastlog; | |
59 | int fd; | |
76a8e733 | 60 | #ifdef LASTLOG_IS_DIR |
12aa90af | 61 | char lbuf[1024]; |
76a8e733 | 62 | #endif /* LASTLOG_IS_DIR */ |
5260325f | 63 | |
64 | lastlog = _PATH_LASTLOG; | |
65 | buf[0] = '\0'; | |
66 | ||
12aa90af | 67 | #ifndef LASTLOG_IS_DIR |
5260325f | 68 | fd = open(lastlog, O_RDONLY); |
69 | if (fd < 0) | |
70 | return 0; | |
71 | lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET); | |
76a8e733 | 72 | #else /* LASTLOG_IS_DIR */ |
12aa90af | 73 | snprintf(lbuf, sizeof(buf), "%s/%s", lastlog, logname); |
74 | fd = open(lbuf, O_RDONLY); | |
76a8e733 | 75 | if (fd < 0) |
76 | return 0; | |
77 | #endif /* LASTLOG_IS_DIR */ | |
5260325f | 78 | if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) { |
79 | close(fd); | |
80 | return 0; | |
81 | } | |
82 | close(fd); | |
83 | if (bufsize > sizeof(ll.ll_host) + 1) | |
84 | bufsize = sizeof(ll.ll_host) + 1; | |
85 | strncpy(buf, ll.ll_host, bufsize - 1); | |
86 | buf[bufsize - 1] = 0; | |
87 | return ll.ll_time; | |
a7effaac | 88 | |
ae28776a | 89 | #else /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */ |
a7effaac | 90 | /* Look in wtmp for the last login */ |
91 | struct utmp wt; | |
92 | char *wt_file = _PATH_WTMP; | |
93 | int fd1; | |
94 | unsigned long t = 0; | |
95 | ||
96 | if ( (fd1 = open(wt_file, O_RDONLY)) < 0 ) { | |
97 | error("Couldn't open %.100s to find last login time.", wt_file); | |
98 | return 0; | |
99 | } | |
100 | ||
101 | /* seek to last record of file */ | |
102 | lseek(fd1, (off_t)(0-sizeof(struct utmp)), SEEK_END); | |
103 | ||
104 | /* loop through wtmp for our last user login record */ | |
105 | do { | |
106 | if (read(fd1, &wt, sizeof(wt)) != sizeof(wt)) { | |
107 | close(fd1); | |
108 | return 0; | |
109 | } | |
110 | ||
111 | if ( wt.ut_type == USER_PROCESS) { | |
112 | if ( !strncmp(logname, wt.ut_user, 8) ) { | |
113 | t = (unsigned long) wt.ut_time; | |
ae28776a | 114 | #ifdef HAVE_HOST_IN_UTMP |
a7effaac | 115 | if (bufsize > sizeof(wt.ut_host) + 1) |
116 | bufsize = sizeof(wt.ut_host) + 1; | |
117 | strncpy(buf, wt.ut_host, bufsize - 1); | |
118 | buf[bufsize - 1] = 0; | |
ae28776a | 119 | #else /* HAVE_HOST_IN_UTMP */ |
120 | buf[0] = 0; | |
121 | #endif /* HAVE_HOST_IN_UTMP */ | |
a7effaac | 122 | } |
123 | } | |
124 | ||
125 | if (lseek(fd1, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) | |
126 | break; | |
127 | } while (t == 0); | |
128 | ||
129 | return t; | |
ae28776a | 130 | #endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */ |
8efc0c15 | 131 | } |
132 | ||
aa3378df | 133 | /* |
134 | * Records that the user has logged in. I these parts of operating systems | |
135 | * were more standardized. | |
136 | */ | |
8efc0c15 | 137 | |
6ae2364d | 138 | void |
9da5c3c9 | 139 | record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid, |
48e671d5 | 140 | const char *host, struct sockaddr * addr) |
8efc0c15 | 141 | { |
ae28776a | 142 | #if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) |
5260325f | 143 | struct lastlog ll; |
144 | char *lastlog; | |
76a8e733 | 145 | #ifdef LASTLOG_IS_DIR |
146 | char buf[1024]; | |
147 | #endif /* LASTLOG_IS_DIR */ | |
ae28776a | 148 | #endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */ |
f498ed15 | 149 | struct utmp u; |
150 | #if defined(HAVE_UTMPX_H) && defined(USE_UTMPX) | |
151 | struct utmpx utx; | |
152 | #endif | |
5260325f | 153 | |
154 | /* Construct an utmp/wtmp entry. */ | |
155 | memset(&u, 0, sizeof(u)); | |
156 | strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line)); | |
c73a0cb5 | 157 | #if defined(HAVE_ID_IN_UTMP) |
0d5f7abc | 158 | #ifdef _AIX |
159 | strncpy(u.ut_id, ttyname + 5, sizeof(u.ut_id)); | |
160 | #else /* !AIX */ | |
21feb5fa | 161 | strncpy(u.ut_id, ttyname + 8, sizeof(u.ut_id)); |
0d5f7abc | 162 | #endif |
c73a0cb5 | 163 | #endif /* defined(HAVE_ID_IN_UTMP) */ |
5260325f | 164 | strncpy(u.ut_name, user, sizeof(u.ut_name)); |
70e0115b | 165 | #if defined(HAVE_TV_IN_UTMP) |
166 | (void)gettimeofday(&u.ut_tv, NULL); | |
167 | #else /* defined(HAVE_TV_IN_UTMP) */ | |
168 | u.ut_time = time(NULL); | |
169 | #endif /* defined(HAVE_TV_IN_UTMP) */ | |
170 | #if defined(HAVE_PID_IN_UTMP) | |
171 | u.ut_pid = (pid_t)pid; | |
172 | #endif /* HAVE_PID_IN_UTMP */ | |
173 | #if defined(HAVE_TYPE_IN_UTMP) | |
f498ed15 | 174 | u.ut_type = (uid == -1)?DEAD_PROCESS:USER_PROCESS; |
70e0115b | 175 | #endif /* HAVE_TYPE_IN_UTMP */ |
f498ed15 | 176 | #if defined(HAVE_HOST_IN_UTMP) |
5260325f | 177 | strncpy(u.ut_host, host, sizeof(u.ut_host)); |
4cca272e | 178 | #endif |
4811cc0b | 179 | #if defined(HAVE_ADDR_IN_UTMP) |
bfae20ad | 180 | if (addr) { |
181 | switch (addr->sa_family) { | |
182 | case AF_INET: { | |
183 | struct sockaddr_in *in = (struct sockaddr_in*)addr; | |
184 | memcpy(&(u.ut_addr), &(in->sin_addr), sizeof(&(in->sin_addr))); | |
185 | break; | |
186 | } | |
48e671d5 | 187 | #if defined(HAVE_ADDR_V6_IN_UTMP) |
bfae20ad | 188 | case AF_INET6: { |
189 | struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr; | |
190 | memcpy(u.ut_addr_v6, &(in6->sin6_addr), sizeof(&(in6->sin6_addr))); | |
191 | break; | |
192 | } | |
48e671d5 | 193 | #endif |
bfae20ad | 194 | default: |
195 | break; | |
196 | } | |
48e671d5 | 197 | } |
4811cc0b | 198 | #endif |
8efc0c15 | 199 | |
f498ed15 | 200 | #if defined(HAVE_UTMPX_H) && defined(USE_UTMPX) |
201 | memset(&utx, 0, sizeof(utx)); | |
202 | strncpy(utx.ut_user, user, sizeof(utx.ut_name)); | |
203 | strncpy(utx.ut_line, ttyname + 5, sizeof(utx.ut_line)); | |
21feb5fa | 204 | strncpy(utx.ut_id, ttyname + 8, sizeof(utx.ut_id)); |
f498ed15 | 205 | utx.ut_pid = (pid_t)pid; |
70e0115b | 206 | (void)gettimeofday(&utx.ut_tv, NULL); |
f74efc8d | 207 | utx.ut_type = (uid == -1)?DEAD_PROCESS:USER_PROCESS; |
208 | # ifdef HAVE_HOST_IN_UTMPX | |
209 | # ifdef HAVE_SYSLEN_IN_UTMPX | |
f498ed15 | 210 | utx.ut_syslen = strlen(host); |
f74efc8d | 211 | strncpy(utx.ut_host, host, utx.ut_syslen); |
212 | # else | |
f498ed15 | 213 | strncpy(utx.ut_host, host, sizeof(utx.ut_host)); |
f74efc8d | 214 | # endif /* HAVE_SYSLEN_IN_UTMPX */ |
215 | # endif | |
48e671d5 | 216 | #if defined(HAVE_ADDR_IN_UTMPX) |
aaf2abd7 | 217 | if (addr) { |
bfae20ad | 218 | switch (addr->sa_family) { |
219 | case AF_INET: { | |
220 | struct sockaddr_in *in = (struct sockaddr_in*)addr; | |
221 | memcpy(&(utx.ut_addr), &(in->sin_addr), sizeof(&(in->sin_addr))); | |
222 | break; | |
223 | } | |
48e671d5 | 224 | #if defined(HAVE_ADDR_V6_IN_UTMPX) |
bfae20ad | 225 | case AF_INET6: { |
226 | struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr; | |
227 | memcpy(utx.ut_addr_v6, &(in6->sin6_addr), sizeof(&(in6->sin6_addr))); | |
228 | break; | |
229 | } | |
48e671d5 | 230 | #endif |
bfae20ad | 231 | default: |
232 | break; | |
233 | } | |
48e671d5 | 234 | } |
235 | #endif | |
f498ed15 | 236 | #endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */ |
5260325f | 237 | |
f74efc8d | 238 | /*#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX) && !defined(HAVE_LOGIN)*/ |
239 | #if defined(HAVE_UTMPX_H) && defined(USE_UTMPX) | |
f498ed15 | 240 | login(&u, &utx); |
241 | #else /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */ | |
5260325f | 242 | login(&u); |
f498ed15 | 243 | #endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */ |
a7effaac | 244 | |
ae28776a | 245 | #if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) |
5260325f | 246 | lastlog = _PATH_LASTLOG; |
247 | ||
248 | /* Update lastlog unless actually recording a logout. */ | |
249 | if (strcmp(user, "") != 0) { | |
a7effaac | 250 | int fd; |
aa3378df | 251 | /* |
252 | * It is safer to bzero the lastlog structure first because | |
253 | * some systems might have some extra fields in it (e.g. SGI) | |
254 | */ | |
5260325f | 255 | memset(&ll, 0, sizeof(ll)); |
256 | ||
257 | /* Update lastlog. */ | |
258 | ll.ll_time = time(NULL); | |
259 | strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line)); | |
260 | strncpy(ll.ll_host, host, sizeof(ll.ll_host)); | |
76a8e733 | 261 | #ifdef LASTLOG_IS_DIR |
9d5f374b | 262 | snprintf(buf, sizeof(buf), "%s/%s", lastlog, user); |
76a8e733 | 263 | fd = open(buf, O_RDWR); |
264 | if (fd >= 0) { | |
265 | #else /* LASTLOG_IS_DIR */ | |
5260325f | 266 | fd = open(lastlog, O_RDWR); |
267 | if (fd >= 0) { | |
268 | lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET); | |
76a8e733 | 269 | #endif /* LASTLOG_IS_DIR */ |
5260325f | 270 | if (write(fd, &ll, sizeof(ll)) != sizeof(ll)) |
271 | log("Could not write %.100s: %.100s", lastlog, strerror(errno)); | |
272 | close(fd); | |
273 | } | |
8efc0c15 | 274 | } |
ae28776a | 275 | #endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */ |
8efc0c15 | 276 | } |
5260325f | 277 | |
278 | /* Records that the user has logged out. */ | |
279 | ||
6ae2364d | 280 | void |
9da5c3c9 | 281 | record_logout(pid_t pid, const char *ttyname) |
8efc0c15 | 282 | { |
4cca272e | 283 | #ifdef HAVE_LIBUTIL_LOGIN |
5260325f | 284 | const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */ |
285 | if (logout(line)) | |
286 | logwtmp(line, "", ""); | |
4cca272e | 287 | #else /* HAVE_LIBUTIL_LOGIN */ |
5260325f | 288 | record_login(pid, ttyname, "", -1, "", NULL); |
4cca272e | 289 | #endif /* HAVE_LIBUTIL_LOGIN */ |
8efc0c15 | 290 | } |