projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 88e1d522 BJ |
1 | #include <stdio.h> |
| 2 | #include <pwd.h> | |
| 3 | ||
| 4 | struct passwd *pwd,*getpwnam(); | |
| 5 | char *crypt(); | |
| 6 | char *getpass(); | |
| 7 | ||
| 8 | main(argc,argv) | |
| 9 | int argc; | |
| 10 | char **argv; | |
| 11 | { | |
| 12 | char *nptr; | |
| 13 | char *password; | |
| 14 | int badsw = 0; | |
| 15 | char *shell = "/bin/sh"; | |
| 16 | ||
| 17 | if(argc > 1) | |
| 18 | nptr = argv[1]; | |
| 19 | else | |
| 20 | nptr = "root"; | |
| 21 | if((pwd=getpwnam(nptr)) == NULL) { | |
| 22 | printf("Unknown id: %s\n",nptr); | |
| 23 | exit(1); | |
| 24 | } | |
| 25 | if(pwd->pw_passwd[0] == '\0' || getuid() == 0) | |
| 26 | goto ok; | |
| 27 | password = getpass("Password:"); | |
| 28 | if(badsw || (strcmp(pwd->pw_passwd, crypt(password, pwd->pw_passwd)) != 0)) { | |
| 29 | bad: | |
| 30 | printf("Sorry\n"); | |
| 31 | if(pwd->pw_uid == 0) { | |
| 32 | FILE *console = fopen("/dev/console", "w"); | |
| 33 | if (console != NULL) { | |
| 34 | fprintf(console, "BADSU: %s %s\r\n", getlogin(), ttyname(2)); | |
| 35 | fclose(console); | |
| 36 | } | |
| 37 | } | |
| 38 | exit(2); | |
| 39 | } | |
| 40 | if(pwd->pw_uid == 0 && badroot(getgid(),getuid())) | |
| 41 | goto bad; | |
| 42 | ||
| 43 | ok: | |
| 44 | endpwent(); | |
| 45 | if(pwd->pw_uid == 0) { | |
| 46 | FILE *console = fopen("/dev/console", "w"); | |
| 47 | if (console != NULL) { | |
| 48 | fprintf(console, "SU: %s %s\r\n", getlogin(), ttyname(2)); | |
| 49 | fclose(console); | |
| 50 | } | |
| 51 | } | |
| 52 | setgid(pwd->pw_gid); | |
| 53 | setuid(pwd->pw_uid); | |
| 54 | if (pwd->pw_shell && *pwd->pw_shell) | |
| 55 | shell = pwd->pw_shell; | |
| 56 | homeis(pwd->pw_dir); | |
| 57 | shellis(shell); | |
| 58 | execl(shell, "su", 0); | |
| 59 | printf("No shell\n"); | |
| 60 | exit(3); | |
| 61 | } | |
| 62 | badroot(gid,uid) | |
| 63 | { | |
| 64 | /* | |
| 65 | if(gid!=10 || (uid > 15 && (uid!=40 && uid!=209 && uid!=203 | |
| 66 | && uid!=54 && uid!=245))) | |
| 67 | return(1); | |
| 68 | else | |
| 69 | */ | |
| 70 | return(0); | |
| 71 | } | |
| 72 | ||
| 73 | char **environ; | |
| 74 | ||
| 75 | homeis(hp) | |
| 76 | char *hp; | |
| 77 | { | |
| 78 | register char *cp, *dp; | |
| 79 | register char **ep = environ; | |
| 80 | static char homebuf[128]; | |
| 81 | ||
| 82 | while (dp = *ep++) { | |
| 83 | for (cp = "HOME"; *cp == *dp && *cp; cp++, dp++) | |
| 84 | continue; | |
| 85 | if (*cp == 0 && (*dp == '=' || *dp == 0)) { | |
| 86 | strcpy(homebuf, "HOME="); | |
| 87 | strcat(homebuf, hp); | |
| 88 | *--ep = homebuf; | |
| 89 | return; | |
| 90 | } | |
| 91 | } | |
| 92 | } | |
| 93 | ||
| 94 | shellis(sp) | |
| 95 | char *sp; | |
| 96 | { | |
| 97 | register char *cp, *dp; | |
| 98 | register char **ep = environ; | |
| 99 | static char shellbuf[128]; | |
| 100 | ||
| 101 | while (dp = *ep++) { | |
| 102 | for (cp = "SHELL"; *cp == *dp && *cp; cp++, dp++) | |
| 103 | continue; | |
| 104 | if (*cp == 0 && (*dp == '=' || *dp == 0)) { | |
| 105 | strcpy(shellbuf, "SHELL="); | |
| 106 | strcat(shellbuf, sp); | |
| 107 | *--ep = shellbuf; | |
| 108 | return; | |
| 109 | } | |
| 110 | } | |
| 111 | } |