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1 | /* | |
2 | ||
3 | login.c | |
4 | ||
5 | Author: Tatu Ylonen <ylo@cs.hut.fi> | |
6 | ||
7 | Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
8 | All rights reserved | |
9 | ||
10 | Created: Fri Mar 24 14:51:08 1995 ylo | |
11 | ||
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. | |
17 | ||
18 | */ | |
19 | ||
20 | #include "includes.h" | |
21 | RCSID("$Id$"); | |
22 | ||
23 | #include <utmp.h> | |
24 | ||
25 | #ifdef HAVE_LASTLOG_H | |
26 | # include <lastlog.h> | |
27 | #endif | |
28 | ||
29 | #include "ssh.h" | |
30 | ||
31 | /* Returns the time when the user last logged in. Returns 0 if the | |
32 | information is not available. This must be called before record_login. | |
33 | The host the user logged in from will be returned in buf. */ | |
34 | ||
35 | /* Returns the time when the user last logged in (or 0 if no previous login | |
36 | is found). The name of the host used last time is returned in buf. */ | |
37 | ||
38 | unsigned long get_last_login_time(uid_t uid, const char *logname, | |
39 | char *buf, unsigned int bufsize) | |
40 | { | |
41 | struct lastlog ll; | |
42 | char *lastlog; | |
43 | int fd; | |
44 | ||
45 | lastlog = _PATH_LASTLOG; | |
46 | ||
47 | buf[0] = '\0'; | |
48 | ||
49 | fd = open(lastlog, O_RDONLY); | |
50 | if (fd < 0) | |
51 | return 0; | |
52 | lseek(fd, (off_t)((long)uid * sizeof(ll)), SEEK_SET); | |
53 | if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) | |
54 | { | |
55 | close(fd); | |
56 | return 0; | |
57 | } | |
58 | close(fd); | |
59 | if (bufsize > sizeof(ll.ll_host) + 1) | |
60 | bufsize = sizeof(ll.ll_host) + 1; | |
61 | strncpy(buf, ll.ll_host, bufsize - 1); | |
62 | buf[bufsize - 1] = 0; | |
63 | return ll.ll_time; | |
64 | } | |
65 | ||
66 | /* Records that the user has logged in. I these parts of operating systems | |
67 | were more standardized. */ | |
68 | ||
69 | void record_login(int pid, const char *ttyname, const char *user, uid_t uid, | |
70 | const char *host, struct sockaddr_in *addr) | |
71 | { | |
72 | int fd; | |
73 | struct lastlog ll; | |
74 | char *lastlog; | |
75 | ||
76 | struct utmp u; | |
77 | const char *utmp, *wtmp; | |
78 | ||
79 | /* Construct an utmp/wtmp entry. */ | |
80 | memset(&u, 0, sizeof(u)); | |
81 | strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line)); | |
82 | u.ut_time = time(NULL); | |
83 | strncpy(u.ut_name, user, sizeof(u.ut_name)); | |
84 | #ifdef HAVE_HOST_IN_UTMP | |
85 | strncpy(u.ut_host, host, sizeof(u.ut_host)); | |
86 | #endif | |
87 | ||
88 | /* Figure out the file names. */ | |
89 | utmp = _PATH_UTMP; | |
90 | wtmp = _PATH_WTMP; | |
91 | ||
92 | login(&u); | |
93 | ||
94 | lastlog = _PATH_LASTLOG; | |
95 | ||
96 | /* Update lastlog unless actually recording a logout. */ | |
97 | if (strcmp(user, "") != 0) | |
98 | { | |
99 | /* It is safer to bzero the lastlog structure first because some | |
100 | systems might have some extra fields in it (e.g. SGI) */ | |
101 | memset(&ll, 0, sizeof(ll)); | |
102 | ||
103 | /* Update lastlog. */ | |
104 | ll.ll_time = time(NULL); | |
105 | strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line)); | |
106 | strncpy(ll.ll_host, host, sizeof(ll.ll_host)); | |
107 | fd = open(lastlog, O_RDWR); | |
108 | if (fd >= 0) | |
109 | { | |
110 | lseek(fd, (off_t)((long)uid * sizeof(ll)), SEEK_SET); | |
111 | if (write(fd, &ll, sizeof(ll)) != sizeof(ll)) | |
112 | log("Could not write %.100s: %.100s", lastlog, strerror(errno)); | |
113 | close(fd); | |
114 | } | |
115 | } | |
116 | } | |
117 | ||
118 | void record_logout(int pid, const char *ttyname) | |
119 | { | |
120 | #ifdef HAVE_LIBUTIL_LOGIN | |
121 | const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */ | |
122 | if (logout(line)) | |
123 | logwtmp(line, "", ""); | |
124 | #else /* HAVE_LIBUTIL_LOGIN */ | |
125 | record_login(pid, ttyname, "", -1, "", NULL); | |
126 | #endif /* HAVE_LIBUTIL_LOGIN */ | |
127 | } | |
128 |