Commit | Line | Data |
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31e00b32 DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
8 | char copyright[] = | |
9 | "@(#) Copyright (c) 1980 Regents of the University of California.\n\ | |
10 | All rights reserved.\n"; | |
11 | #endif not lint | |
12 | ||
13dd8b1d | 13 | #ifndef lint |
da31c6da | 14 | static char sccsid[] = "@(#)su.c 5.3 (Berkeley) %G%"; |
31e00b32 | 15 | #endif not lint |
13dd8b1d | 16 | |
3a265c7a BJ |
17 | #include <stdio.h> |
18 | #include <pwd.h> | |
b3d7f31f | 19 | #include <grp.h> |
d3d53c7f | 20 | #include <syslog.h> |
4f4c2c68 SL |
21 | #include <sys/types.h> |
22 | #include <sys/time.h> | |
23 | #include <sys/resource.h> | |
3a265c7a | 24 | |
4f4c2c68 SL |
25 | char userbuf[16] = "USER="; |
26 | char homebuf[128] = "HOME="; | |
27 | char shellbuf[128] = "SHELL="; | |
28 | char pathbuf[128] = "PATH=:/usr/ucb:/bin:/usr/bin"; | |
29 | char *cleanenv[] = { userbuf, homebuf, shellbuf, pathbuf, 0, 0 }; | |
30 | char *user = "root"; | |
31 | char *shell = "/bin/sh"; | |
32 | int fulllogin; | |
33 | int fastlogin; | |
34 | ||
35 | extern char **environ; | |
b3d7f31f | 36 | struct passwd *pwd; |
3a265c7a BJ |
37 | char *crypt(); |
38 | char *getpass(); | |
4f4c2c68 | 39 | char *getenv(); |
3a265c7a BJ |
40 | |
41 | main(argc,argv) | |
13dd8b1d | 42 | int argc; |
4f4c2c68 | 43 | char *argv[]; |
3a265c7a | 44 | { |
3a265c7a | 45 | char *password; |
a8a168db RC |
46 | char buf[1000]; |
47 | FILE *fp; | |
3a265c7a | 48 | |
da31c6da EA |
49 | openlog("su", LOG_ODELAY, LOG_AUTH); |
50 | ||
4f4c2c68 SL |
51 | again: |
52 | if (argc > 1 && strcmp(argv[1], "-f") == 0) { | |
53 | fastlogin++; | |
54 | argc--, argv++; | |
55 | goto again; | |
56 | } | |
57 | if (argc > 1 && strcmp(argv[1], "-") == 0) { | |
58 | fulllogin++; | |
59 | argc--, argv++; | |
60 | goto again; | |
61 | } | |
62 | if (argc > 1 && argv[1][0] != '-') { | |
63 | user = argv[1]; | |
64 | argc--, argv++; | |
65 | } | |
96f93d9e RC |
66 | if ((pwd = getpwuid(getuid())) == NULL) { |
67 | fprintf(stderr, "Who are you?\n"); | |
68 | exit(1); | |
69 | } | |
70 | strcpy(buf, pwd->pw_name); | |
71 | if ((pwd = getpwnam(user)) == NULL) { | |
72 | fprintf(stderr, "Unknown login: %s\n", user); | |
73 | exit(1); | |
74 | } | |
75 | /* | |
76 | * Only allow those in group zero to su to root. | |
77 | */ | |
78 | if (pwd->pw_uid == 0) { | |
b3d7f31f RC |
79 | struct group *gr; |
80 | int i; | |
81 | ||
b3d7f31f RC |
82 | if ((gr = getgrgid(0)) != NULL) { |
83 | for (i = 0; gr->gr_mem[i] != NULL; i++) | |
96f93d9e | 84 | if (strcmp(buf, gr->gr_mem[i]) == 0) |
a8a168db | 85 | goto userok; |
96f93d9e RC |
86 | fprintf(stderr, "You do not have permission to su %s\n", |
87 | user); | |
a8a168db RC |
88 | exit(1); |
89 | } | |
90 | userok: | |
4f4c2c68 | 91 | setpriority(PRIO_PROCESS, 0, -2); |
a8a168db RC |
92 | } |
93 | ||
13dd8b1d | 94 | if (pwd->pw_passwd[0] == '\0' || getuid() == 0) |
3a265c7a BJ |
95 | goto ok; |
96 | password = getpass("Password:"); | |
13dd8b1d | 97 | if (strcmp(pwd->pw_passwd, crypt(password, pwd->pw_passwd)) != 0) { |
4f4c2c68 | 98 | fprintf(stderr, "Sorry\n"); |
13dd8b1d | 99 | if (pwd->pw_uid == 0) { |
da31c6da | 100 | syslog(LOG_CRIT, "BAD SU %s on %s", |
13dd8b1d | 101 | getlogin(), ttyname(2)); |
3a265c7a BJ |
102 | } |
103 | exit(2); | |
104 | } | |
105 | ok: | |
106 | endpwent(); | |
13dd8b1d | 107 | if (pwd->pw_uid == 0) { |
da31c6da | 108 | syslog(LOG_NOTICE, "%s on %s", getlogin(), ttyname(2)); |
d3d53c7f | 109 | closelog(); |
3a265c7a | 110 | } |
13dd8b1d SL |
111 | if (setgid(pwd->pw_gid) < 0) { |
112 | perror("su: setgid"); | |
113 | exit(3); | |
114 | } | |
4f4c2c68 | 115 | if (initgroups(user, pwd->pw_gid)) { |
13dd8b1d SL |
116 | fprintf(stderr, "su: initgroups failed\n"); |
117 | exit(4); | |
118 | } | |
119 | if (setuid(pwd->pw_uid) < 0) { | |
120 | perror("su: setuid"); | |
121 | exit(5); | |
122 | } | |
3a265c7a BJ |
123 | if (pwd->pw_shell && *pwd->pw_shell) |
124 | shell = pwd->pw_shell; | |
4f4c2c68 SL |
125 | if (fulllogin) { |
126 | cleanenv[4] = getenv("TERM"); | |
127 | environ = cleanenv; | |
128 | } | |
c399698a SL |
129 | if (strcmp(user, "root")) |
130 | setenv("USER", pwd->pw_name, userbuf); | |
4f4c2c68 SL |
131 | setenv("SHELL", shell, shellbuf); |
132 | setenv("HOME", pwd->pw_dir, homebuf); | |
133 | setpriority(PRIO_PROCESS, 0, 0); | |
134 | if (fastlogin) { | |
135 | *argv-- = "-f"; | |
136 | *argv = "su"; | |
137 | } else if (fulllogin) { | |
138 | if (chdir(pwd->pw_dir) < 0) { | |
139 | fprintf(stderr, "No directory\n"); | |
140 | exit(6); | |
141 | } | |
142 | *argv = "-su"; | |
143 | } else | |
144 | *argv = "su"; | |
145 | execv(shell, argv); | |
146 | fprintf(stderr, "No shell\n"); | |
147 | exit(7); | |
3a265c7a BJ |
148 | } |
149 | ||
4f4c2c68 SL |
150 | setenv(ename, eval, buf) |
151 | char *ename, *eval, *buf; | |
3a265c7a BJ |
152 | { |
153 | register char *cp, *dp; | |
154 | register char **ep = environ; | |
3a265c7a | 155 | |
4f4c2c68 SL |
156 | /* |
157 | * this assumes an environment variable "ename" already exists | |
158 | */ | |
3a265c7a | 159 | while (dp = *ep++) { |
4f4c2c68 | 160 | for (cp = ename; *cp == *dp && *cp; cp++, dp++) |
3a265c7a BJ |
161 | continue; |
162 | if (*cp == 0 && (*dp == '=' || *dp == 0)) { | |
4f4c2c68 SL |
163 | strcat(buf, eval); |
164 | *--ep = buf; | |
3a265c7a BJ |
165 | return; |
166 | } | |
167 | } | |
168 | } | |
169 | ||
4f4c2c68 SL |
170 | char * |
171 | getenv(ename) | |
172 | char *ename; | |
3a265c7a BJ |
173 | { |
174 | register char *cp, *dp; | |
175 | register char **ep = environ; | |
3a265c7a BJ |
176 | |
177 | while (dp = *ep++) { | |
4f4c2c68 | 178 | for (cp = ename; *cp == *dp && *cp; cp++, dp++) |
3a265c7a | 179 | continue; |
4f4c2c68 SL |
180 | if (*cp == 0 && (*dp == '=' || *dp == 0)) |
181 | return (*--ep); | |
3a265c7a | 182 | } |
4f4c2c68 | 183 | return ((char *)0); |
3a265c7a | 184 | } |