Commit | Line | Data |
---|---|---|
13dd8b1d | 1 | #ifndef lint |
56f24790 | 2 | static char *sccsid = "@(#)su.c 4.9 (Berkeley) %G%"; |
13dd8b1d SL |
3 | #endif |
4 | ||
3a265c7a BJ |
5 | #include <stdio.h> |
6 | #include <pwd.h> | |
b3d7f31f | 7 | #include <grp.h> |
4f4c2c68 SL |
8 | #include <sys/types.h> |
9 | #include <sys/time.h> | |
10 | #include <sys/resource.h> | |
3a265c7a | 11 | |
4f4c2c68 SL |
12 | char userbuf[16] = "USER="; |
13 | char homebuf[128] = "HOME="; | |
14 | char shellbuf[128] = "SHELL="; | |
15 | char pathbuf[128] = "PATH=:/usr/ucb:/bin:/usr/bin"; | |
16 | char *cleanenv[] = { userbuf, homebuf, shellbuf, pathbuf, 0, 0 }; | |
17 | char *user = "root"; | |
18 | char *shell = "/bin/sh"; | |
19 | int fulllogin; | |
20 | int fastlogin; | |
21 | ||
22 | extern char **environ; | |
b3d7f31f | 23 | struct passwd *pwd; |
3a265c7a BJ |
24 | char *crypt(); |
25 | char *getpass(); | |
4f4c2c68 | 26 | char *getenv(); |
3a265c7a BJ |
27 | |
28 | main(argc,argv) | |
13dd8b1d | 29 | int argc; |
4f4c2c68 | 30 | char *argv[]; |
3a265c7a | 31 | { |
3a265c7a | 32 | char *password; |
a8a168db RC |
33 | char buf[1000]; |
34 | FILE *fp; | |
3a265c7a | 35 | |
4f4c2c68 SL |
36 | again: |
37 | if (argc > 1 && strcmp(argv[1], "-f") == 0) { | |
38 | fastlogin++; | |
39 | argc--, argv++; | |
40 | goto again; | |
41 | } | |
42 | if (argc > 1 && strcmp(argv[1], "-") == 0) { | |
43 | fulllogin++; | |
44 | argc--, argv++; | |
45 | goto again; | |
46 | } | |
47 | if (argc > 1 && argv[1][0] != '-') { | |
48 | user = argv[1]; | |
49 | argc--, argv++; | |
50 | } | |
96f93d9e RC |
51 | if ((pwd = getpwuid(getuid())) == NULL) { |
52 | fprintf(stderr, "Who are you?\n"); | |
53 | exit(1); | |
54 | } | |
55 | strcpy(buf, pwd->pw_name); | |
56 | if ((pwd = getpwnam(user)) == NULL) { | |
57 | fprintf(stderr, "Unknown login: %s\n", user); | |
58 | exit(1); | |
59 | } | |
60 | /* | |
61 | * Only allow those in group zero to su to root. | |
62 | */ | |
63 | if (pwd->pw_uid == 0) { | |
b3d7f31f RC |
64 | struct group *gr; |
65 | int i; | |
66 | ||
b3d7f31f RC |
67 | if ((gr = getgrgid(0)) != NULL) { |
68 | for (i = 0; gr->gr_mem[i] != NULL; i++) | |
96f93d9e | 69 | if (strcmp(buf, gr->gr_mem[i]) == 0) |
a8a168db | 70 | goto userok; |
96f93d9e RC |
71 | fprintf(stderr, "You do not have permission to su %s\n", |
72 | user); | |
a8a168db RC |
73 | exit(1); |
74 | } | |
75 | userok: | |
4f4c2c68 | 76 | setpriority(PRIO_PROCESS, 0, -2); |
a8a168db RC |
77 | } |
78 | ||
13dd8b1d | 79 | if (pwd->pw_passwd[0] == '\0' || getuid() == 0) |
3a265c7a BJ |
80 | goto ok; |
81 | password = getpass("Password:"); | |
13dd8b1d | 82 | if (strcmp(pwd->pw_passwd, crypt(password, pwd->pw_passwd)) != 0) { |
4f4c2c68 | 83 | fprintf(stderr, "Sorry\n"); |
13dd8b1d | 84 | if (pwd->pw_uid == 0) { |
3a265c7a BJ |
85 | FILE *console = fopen("/dev/console", "w"); |
86 | if (console != NULL) { | |
13dd8b1d SL |
87 | fprintf(console, "BADSU: %s %s\r\n", |
88 | getlogin(), ttyname(2)); | |
3a265c7a BJ |
89 | fclose(console); |
90 | } | |
91 | } | |
92 | exit(2); | |
93 | } | |
94 | ok: | |
95 | endpwent(); | |
13dd8b1d | 96 | if (pwd->pw_uid == 0) { |
3a265c7a BJ |
97 | FILE *console = fopen("/dev/console", "w"); |
98 | if (console != NULL) { | |
13dd8b1d SL |
99 | fprintf(console, "SU: %s %s\r\n", |
100 | getlogin(), ttyname(2)); | |
3a265c7a BJ |
101 | fclose(console); |
102 | } | |
103 | } | |
13dd8b1d SL |
104 | if (setgid(pwd->pw_gid) < 0) { |
105 | perror("su: setgid"); | |
106 | exit(3); | |
107 | } | |
4f4c2c68 | 108 | if (initgroups(user, pwd->pw_gid)) { |
13dd8b1d SL |
109 | fprintf(stderr, "su: initgroups failed\n"); |
110 | exit(4); | |
111 | } | |
112 | if (setuid(pwd->pw_uid) < 0) { | |
113 | perror("su: setuid"); | |
114 | exit(5); | |
115 | } | |
3a265c7a BJ |
116 | if (pwd->pw_shell && *pwd->pw_shell) |
117 | shell = pwd->pw_shell; | |
4f4c2c68 SL |
118 | if (fulllogin) { |
119 | cleanenv[4] = getenv("TERM"); | |
120 | environ = cleanenv; | |
121 | } | |
c399698a SL |
122 | if (strcmp(user, "root")) |
123 | setenv("USER", pwd->pw_name, userbuf); | |
4f4c2c68 SL |
124 | setenv("SHELL", shell, shellbuf); |
125 | setenv("HOME", pwd->pw_dir, homebuf); | |
126 | setpriority(PRIO_PROCESS, 0, 0); | |
127 | if (fastlogin) { | |
128 | *argv-- = "-f"; | |
129 | *argv = "su"; | |
130 | } else if (fulllogin) { | |
131 | if (chdir(pwd->pw_dir) < 0) { | |
132 | fprintf(stderr, "No directory\n"); | |
133 | exit(6); | |
134 | } | |
135 | *argv = "-su"; | |
136 | } else | |
137 | *argv = "su"; | |
138 | execv(shell, argv); | |
139 | fprintf(stderr, "No shell\n"); | |
140 | exit(7); | |
3a265c7a BJ |
141 | } |
142 | ||
4f4c2c68 SL |
143 | setenv(ename, eval, buf) |
144 | char *ename, *eval, *buf; | |
3a265c7a BJ |
145 | { |
146 | register char *cp, *dp; | |
147 | register char **ep = environ; | |
3a265c7a | 148 | |
4f4c2c68 SL |
149 | /* |
150 | * this assumes an environment variable "ename" already exists | |
151 | */ | |
3a265c7a | 152 | while (dp = *ep++) { |
4f4c2c68 | 153 | for (cp = ename; *cp == *dp && *cp; cp++, dp++) |
3a265c7a BJ |
154 | continue; |
155 | if (*cp == 0 && (*dp == '=' || *dp == 0)) { | |
4f4c2c68 SL |
156 | strcat(buf, eval); |
157 | *--ep = buf; | |
3a265c7a BJ |
158 | return; |
159 | } | |
160 | } | |
161 | } | |
162 | ||
4f4c2c68 SL |
163 | char * |
164 | getenv(ename) | |
165 | char *ename; | |
3a265c7a BJ |
166 | { |
167 | register char *cp, *dp; | |
168 | register char **ep = environ; | |
3a265c7a BJ |
169 | |
170 | while (dp = *ep++) { | |
4f4c2c68 | 171 | for (cp = ename; *cp == *dp && *cp; cp++, dp++) |
3a265c7a | 172 | continue; |
4f4c2c68 SL |
173 | if (*cp == 0 && (*dp == '=' || *dp == 0)) |
174 | return (*--ep); | |
3a265c7a | 175 | } |
4f4c2c68 | 176 | return ((char *)0); |
3a265c7a | 177 | } |