projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 31cef89c | 1 | static char *sccsid = "@(#)su.c 4.1 (Berkeley) 10/1/80"; |
| 3a265c7a BJ |
2 | #include <stdio.h> |
| 3 | #include <pwd.h> | |
| 4 | ||
| 5 | struct passwd *pwd,*getpwnam(); | |
| 6 | char *crypt(); | |
| 7 | char *getpass(); | |
| 8 | ||
| 9 | main(argc,argv) | |
| 10 | int argc; | |
| 11 | char **argv; | |
| 12 | { | |
| 13 | char *nptr; | |
| 14 | char *password; | |
| 15 | int badsw = 0; | |
| 16 | char *shell = "/bin/sh"; | |
| 17 | int niced = 0; | |
| 18 | ||
| 19 | if(argc > 1) | |
| 20 | nptr = argv[1]; | |
| 21 | else { | |
| 22 | nptr = "root"; | |
| 23 | nice(-4); | |
| 24 | niced = -4; | |
| 25 | } | |
| 26 | if((pwd=getpwnam(nptr)) == NULL) { | |
| 27 | printf("Unknown id: %s\n",nptr); | |
| 28 | exit(1); | |
| 29 | } | |
| 30 | if(pwd->pw_passwd[0] == '\0' || getuid() == 0) | |
| 31 | goto ok; | |
| 32 | password = getpass("Password:"); | |
| 33 | if(badsw || (strcmp(pwd->pw_passwd, crypt(password, pwd->pw_passwd)) != 0)) { | |
| 34 | bad: | |
| 35 | printf("Sorry\n"); | |
| 36 | if(pwd->pw_uid == 0) { | |
| 37 | FILE *console = fopen("/dev/console", "w"); | |
| 38 | if (console != NULL) { | |
| 39 | fprintf(console, "BADSU: %s %s\r\n", getlogin(), ttyname(2)); | |
| 40 | fclose(console); | |
| 41 | } | |
| 42 | } | |
| 43 | exit(2); | |
| 44 | } | |
| 45 | ok: | |
| 46 | endpwent(); | |
| 47 | if(pwd->pw_uid == 0) { | |
| 48 | FILE *console = fopen("/dev/console", "w"); | |
| 49 | if (console != NULL) { | |
| 50 | fprintf(console, "SU: %s %s\r\n", getlogin(), ttyname(2)); | |
| 51 | fclose(console); | |
| 52 | } | |
| 53 | } | |
| 54 | setgid(pwd->pw_gid); | |
| 55 | setuid(pwd->pw_uid); | |
| 56 | if (pwd->pw_shell && *pwd->pw_shell) | |
| 57 | shell = pwd->pw_shell; | |
| 58 | homeis(pwd->pw_dir); | |
| 59 | shellis(shell); | |
| 60 | nice(-niced); | |
| 61 | execl(shell, "su", 0); | |
| 62 | printf("No shell\n"); | |
| 63 | exit(3); | |
| 64 | } | |
| 65 | ||
| 66 | char **environ; | |
| 67 | ||
| 68 | homeis(hp) | |
| 69 | char *hp; | |
| 70 | { | |
| 71 | register char *cp, *dp; | |
| 72 | register char **ep = environ; | |
| 73 | static char homebuf[128]; | |
| 74 | ||
| 75 | while (dp = *ep++) { | |
| 76 | for (cp = "HOME"; *cp == *dp && *cp; cp++, dp++) | |
| 77 | continue; | |
| 78 | if (*cp == 0 && (*dp == '=' || *dp == 0)) { | |
| 79 | strcpy(homebuf, "HOME="); | |
| 80 | strcat(homebuf, hp); | |
| 81 | *--ep = homebuf; | |
| 82 | return; | |
| 83 | } | |
| 84 | } | |
| 85 | } | |
| 86 | ||
| 87 | shellis(sp) | |
| 88 | char *sp; | |
| 89 | { | |
| 90 | register char *cp, *dp; | |
| 91 | register char **ep = environ; | |
| 92 | static char shellbuf[128]; | |
| 93 | ||
| 94 | while (dp = *ep++) { | |
| 95 | for (cp = "SHELL"; *cp == *dp && *cp; cp++, dp++) | |
| 96 | continue; | |
| 97 | if (*cp == 0 && (*dp == '=' || *dp == 0)) { | |
| 98 | strcpy(shellbuf, "SHELL="); | |
| 99 | strcat(shellbuf, sp); | |
| 100 | *--ep = shellbuf; | |
| 101 | return; | |
| 102 | } | |
| 103 | } | |
| 104 | } |