Commit | Line | Data |
---|---|---|
8c5eec2f 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 | ||
4c6b79b5 | 13 | #ifndef lint |
8c5eec2f DF |
14 | static char sccsid[] = "@(#)vipw.c 5.1 (Berkeley) %G%"; |
15 | #endif not lint | |
4c6b79b5 SL |
16 | |
17 | #include <sys/types.h> | |
18 | #include <sys/stat.h> | |
19 | #include <sys/file.h> | |
20 | ||
21 | #include <stdio.h> | |
22 | #include <errno.h> | |
23 | #include <signal.h> | |
24 | ||
25 | /* | |
26 | * Password file editor with locking. | |
27 | */ | |
c6ab0749 RC |
28 | char temp[] = "/etc/ptmp"; |
29 | char temp_pag[] = "/etc/ptmp.pag"; | |
30 | char temp_dir[] = "/etc/ptmp.dir"; | |
31 | char passwd[] = "/etc/passwd"; | |
32 | char passwd_pag[] = "/etc/passwd.pag"; | |
33 | char passwd_dir[] = "/etc/passwd.dir"; | |
4c6b79b5 SL |
34 | char buf[BUFSIZ]; |
35 | char *getenv(); | |
36 | char *index(); | |
37 | extern int errno; | |
38 | ||
39 | main(argc, argv) | |
40 | char *argv[]; | |
41 | { | |
42 | int fd; | |
43 | FILE *ft, *fp; | |
44 | char *editor; | |
45 | ||
c6ab0749 | 46 | signal(SIGHUP, SIG_IGN); |
4c6b79b5 SL |
47 | signal(SIGINT, SIG_IGN); |
48 | signal(SIGQUIT, SIG_IGN); | |
4c6b79b5 | 49 | setbuf(stderr, NULL); |
b2018160 | 50 | umask(0); |
4c6b79b5 SL |
51 | fd = open(temp, O_WRONLY|O_CREAT|O_EXCL, 0644); |
52 | if (fd < 0) { | |
53 | if (errno == EEXIST) { | |
54 | fprintf(stderr, "vipw: password file busy\n"); | |
55 | exit(1); | |
56 | } | |
57 | fprintf(stderr, "vipw: "); perror(temp); | |
58 | exit(1); | |
59 | } | |
60 | ft = fdopen(fd, "w"); | |
61 | if (ft == NULL) { | |
62 | fprintf(stderr, "vipw: "); perror(temp); | |
63 | goto bad; | |
64 | } | |
65 | fp = fopen(passwd, "r"); | |
66 | if (fp == NULL) { | |
67 | fprintf(stderr, "vipw: "); perror(passwd); | |
68 | goto bad; | |
69 | } | |
70 | while (fgets(buf, sizeof (buf) - 1, fp) != NULL) | |
71 | fputs(buf, ft); | |
72 | fclose(ft); fclose(fp); | |
73 | editor = getenv("EDITOR"); | |
74 | if (editor == 0) | |
75 | editor = "vi"; | |
76 | sprintf(buf, "%s %s", editor, temp); | |
77 | if (system(buf) == 0) { | |
78 | struct stat sbuf; | |
79 | int ok; | |
80 | ||
81 | /* sanity checks */ | |
82 | if (stat(temp, &sbuf) < 0) { | |
83 | fprintf(stderr, | |
84 | "vipw: can't stat temp file, %s unchanged\n", | |
85 | passwd); | |
86 | goto bad; | |
87 | } | |
88 | if (sbuf.st_size == 0) { | |
89 | fprintf(stderr, "vipw: bad temp file, %s unchanged\n", | |
90 | passwd); | |
91 | goto bad; | |
92 | } | |
93 | ft = fopen(temp, "r"); | |
94 | if (ft == NULL) { | |
95 | fprintf(stderr, | |
96 | "vipw: can't reopen temp file, %s unchanged\n", | |
97 | passwd); | |
98 | goto bad; | |
99 | } | |
100 | ok = 0; | |
101 | while (fgets(buf, sizeof (buf) - 1, ft) != NULL) { | |
102 | register char *cp; | |
103 | ||
104 | cp = index(buf, '\n'); | |
105 | if (cp == 0) | |
106 | continue; | |
107 | *cp = '\0'; | |
108 | cp = index(buf, ':'); | |
109 | if (cp == 0) | |
110 | continue; | |
111 | *cp = '\0'; | |
112 | if (strcmp(buf, "root")) | |
113 | continue; | |
114 | /* password */ | |
115 | cp = index(cp + 1, ':'); | |
116 | if (cp == 0) | |
117 | break; | |
118 | /* uid */ | |
119 | if (atoi(cp + 1) != 0) | |
120 | break; | |
121 | cp = index(cp + 1, ':'); | |
122 | if (cp == 0) | |
123 | break; | |
124 | /* gid */ | |
125 | cp = index(cp + 1, ':'); | |
126 | if (cp == 0) | |
127 | break; | |
128 | /* gecos */ | |
129 | cp = index(cp + 1, ':'); | |
130 | if (cp == 0) | |
131 | break; | |
132 | /* login directory */ | |
76eb92c8 | 133 | if (strncmp(++cp, "/:", 2)) |
4c6b79b5 SL |
134 | break; |
135 | cp += 2; | |
136 | if (*cp && strcmp(cp, "/bin/sh") && | |
137 | strcmp(cp, "/bin/csh")) | |
138 | break; | |
139 | ok++; | |
140 | } | |
141 | fclose(ft); | |
142 | if (ok) { | |
ae41743d RC |
143 | if (makedb(temp) < 0) |
144 | fprintf(stderr, "vipw: mkpasswd failed\n"); | |
145 | else if (rename(temp_pag, passwd_pag) < 0) | |
146 | fprintf(stderr, "vipw: "), perror(temp_pag); | |
147 | else if (rename(temp_dir, passwd_dir) < 0) | |
148 | fprintf(stderr, "vipw: "), perror(temp_dir); | |
149 | else if (rename(temp, passwd) < 0) | |
4c6b79b5 | 150 | fprintf(stderr, "vipw: "), perror("rename"); |
6b52f313 RC |
151 | else |
152 | exit(0); | |
4c6b79b5 SL |
153 | } else |
154 | fprintf(stderr, | |
155 | "vipw: you mangled the temp file, %s unchanged\n", | |
156 | passwd); | |
157 | } | |
158 | bad: | |
c6ab0749 RC |
159 | unlink(temp_pag); |
160 | unlink(temp_dir); | |
4c6b79b5 | 161 | unlink(temp); |
6b52f313 | 162 | exit(1); |
4c6b79b5 | 163 | } |
ae41743d RC |
164 | |
165 | makedb(file) | |
166 | char *file; | |
167 | { | |
168 | int status, pid, w; | |
169 | ||
170 | if ((pid = vfork()) == 0) { | |
171 | execl("/etc/mkpasswd", "mkpasswd", file, 0); | |
172 | _exit(127); | |
173 | } | |
174 | while ((w = wait(&status)) != pid && w != -1) | |
175 | ; | |
176 | if (w == -1 || status != 0) | |
177 | status = -1; | |
178 | return(status); | |
179 | } |