| 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 | |
| 13 | #ifndef lint |
| 14 | static char sccsid[] = "@(#)vipw.c 5.1 (Berkeley) %G%"; |
| 15 | #endif not lint |
| 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 | */ |
| 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"; |
| 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 | |
| 46 | signal(SIGHUP, SIG_IGN); |
| 47 | signal(SIGINT, SIG_IGN); |
| 48 | signal(SIGQUIT, SIG_IGN); |
| 49 | setbuf(stderr, NULL); |
| 50 | umask(0); |
| 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 */ |
| 133 | if (strncmp(++cp, "/:", 2)) |
| 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) { |
| 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) |
| 150 | fprintf(stderr, "vipw: "), perror("rename"); |
| 151 | else |
| 152 | exit(0); |
| 153 | } else |
| 154 | fprintf(stderr, |
| 155 | "vipw: you mangled the temp file, %s unchanged\n", |
| 156 | passwd); |
| 157 | } |
| 158 | bad: |
| 159 | unlink(temp_pag); |
| 160 | unlink(temp_dir); |
| 161 | unlink(temp); |
| 162 | exit(1); |
| 163 | } |
| 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 | } |