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[unix-history] / usr / src / usr.bin / su / su.c
diff --git a/usr/src/usr.bin/su/su.c b/usr/src/usr.bin/su/su.c
index 6bb382b..89e8a1d 100644 (file)
--- a/usr/src/usr.bin/su/su.c
+++ b/usr/src/usr.bin/su/su.c
@@ -1,177 +1,204 @@
+/*
+ * Copyright (c) 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1988 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
 #ifndef lint
 #ifndef lint
-static char *sccsid = "@(#)su.c        4.9 (Berkeley) %G%";
-#endif
+static char sccsid[] = "@(#)su.c       5.10 (Berkeley) %G%";
+#endif /* not lint */
 
 
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <syslog.h>
 #include <stdio.h>
 #include <pwd.h>
 #include <grp.h>
 #include <stdio.h>
 #include <pwd.h>
 #include <grp.h>
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/resource.h>
 
 
-char   userbuf[16]     = "USER=";
-char   homebuf[128]    = "HOME=";
-char   shellbuf[128]   = "SHELL=";
-char   pathbuf[128]    = "PATH=:/usr/ucb:/bin:/usr/bin";
-char   *cleanenv[] = { userbuf, homebuf, shellbuf, pathbuf, 0, 0 };
-char   *user = "root";
-char   *shell = "/bin/sh";
-int    fulllogin;
-int    fastlogin;
-
-extern char    **environ;
-struct passwd *pwd;
-char   *crypt();
-char   *getpass();
-char   *getenv();
-
-main(argc,argv)
+main(argc, argv)
        int argc;
        int argc;
-       char *argv[];
+       char **argv;
 {
 {
-       char *password;
-       char buf[1000];
-       FILE *fp;
-
-again:
-       if (argc > 1 && strcmp(argv[1], "-f") == 0) {
-               fastlogin++;
-               argc--, argv++;
-               goto again;
-       }
-       if (argc > 1 && strcmp(argv[1], "-") == 0) {
-               fulllogin++;
-               argc--, argv++;
-               goto again;
-       }
-       if (argc > 1 && argv[1][0] != '-') {
-               user = argv[1];
-               argc--, argv++;
-       }
-       if ((pwd = getpwuid(getuid())) == NULL) {
-               fprintf(stderr, "Who are you?\n");
+       extern char **environ;
+       extern int errno, optind;
+       register struct passwd *pwd;
+       register char *p, **g;
+       struct group *gr;
+       uid_t ruid, getuid();
+       int asme, ch, fulllogin, fastlogin, prio;
+       enum { UNSET, YES, NO } iscsh = UNSET;
+       char *user, *shell, *username, *cleanenv[2], *nargv[4], **np;
+       char namebuf[50], shellbuf[MAXPATHLEN];
+       char *crypt(), *getpass(), *getenv(), *getlogin(), *rindex(), *strcpy();
+
+       np = &nargv[3];
+       *np-- = NULL;
+       asme = fulllogin = fastlogin = 0;
+       while ((ch = getopt(argc, argv, "-flm")) != EOF)
+               switch((char)ch) {
+               case 'f':
+                       fastlogin = 1;
+                       break;
+               case '-':
+               case 'l':
+                       fulllogin = 1;
+                       break;
+               case 'm':
+                       asme = 1;
+                       break;
+               case '?':
+               default:
+                       fprintf(stderr, "usage: su [-flm] [login]\n");
+                       exit(1);
+               }
+       argv += optind;
+
+       errno = 0;
+       prio = getpriority(PRIO_PROCESS, 0);
+       if (errno)
+               prio = 0;
+       (void)setpriority(PRIO_PROCESS, 0, -2);
+
+       /* get current login name and shell */
+       if ((pwd = getpwuid(ruid = getuid())) == NULL) {
+               fprintf(stderr, "su: who are you?\n");
                exit(1);
        }
                exit(1);
        }
-       strcpy(buf, pwd->pw_name);
+       username = strcpy(namebuf, pwd->pw_name);
+       if (asme)
+               if (pwd->pw_shell && *pwd->pw_shell)
+                       shell = strcpy(shellbuf,  pwd->pw_shell);
+               else {
+                       shell = "/bin/sh";
+                       iscsh = NO;
+               }
+
+       /* get target login information */
+       user = *argv ? *argv : "root";
        if ((pwd = getpwnam(user)) == NULL) {
        if ((pwd = getpwnam(user)) == NULL) {
-               fprintf(stderr, "Unknown login: %s\n", user);
+               fprintf(stderr, "su: unknown login %s\n", user);
                exit(1);
        }
                exit(1);
        }
-       /*
-        * Only allow those in group zero to su to root.
-        */
-       if (pwd->pw_uid == 0) {
-               struct  group *gr;
-               int i;
-
-               if ((gr = getgrgid(0)) != NULL) {
-                       for (i = 0; gr->gr_mem[i] != NULL; i++)
-                               if (strcmp(buf, gr->gr_mem[i]) == 0)
-                                       goto userok;
-                       fprintf(stderr, "You do not have permission to su %s\n",
-                               user);
-                       exit(1);
-               }
-       userok:
-               setpriority(PRIO_PROCESS, 0, -2);
-       }
 
 
-       if (pwd->pw_passwd[0] == '\0' || getuid() == 0)
-               goto ok;
-       password = getpass("Password:");
-       if (strcmp(pwd->pw_passwd, crypt(password, pwd->pw_passwd)) != 0) {
-               fprintf(stderr, "Sorry\n");
-               if (pwd->pw_uid == 0) {
-                       FILE *console = fopen("/dev/console", "w");
-                       if (console != NULL) {
-                               fprintf(console, "BADSU: %s %s\r\n",
-                                       getlogin(), ttyname(2));
-                               fclose(console);
+       /* only allow those in group zero to su to root. */
+       if (pwd->pw_uid == 0 && (gr = getgrgid((gid_t)0)))
+               for (g = gr->gr_mem;; ++g) {
+                       if (!*g) {
+                               fprintf(stderr, "su: you are not in the correct group to su %s.\n", user);
+                               exit(1);
                        }
                        }
+                       if (!strcmp(username, *g))
+                               break;
+               }
+
+       /* if target requires a password, verify it */
+       if (ruid && *pwd->pw_passwd) {
+               p = getpass("Password:");
+               if (strcmp(pwd->pw_passwd, crypt(p, pwd->pw_passwd))) {
+                       fprintf(stderr, "Sorry\n");
+                       if (pwd->pw_uid == 0)
+                               syslog(LOG_CRIT|LOG_AUTH, "su: BAD SU %s on %s", username, ttyname(2));
+                       exit(1);
                }
                }
-               exit(2);
        }
        }
-ok:
-       endpwent();
-       if (pwd->pw_uid == 0) {
-               FILE *console = fopen("/dev/console", "w");
-               if (console != NULL) {
-                       fprintf(console, "SU: %s %s\r\n",
-                               getlogin(), ttyname(2));
-                       fclose(console);
+
+       /* if not asme or target's shell isn't standard, use it */
+       if (!asme || !chshell(pwd->pw_shell))
+               if (pwd->pw_shell && *pwd->pw_shell) {
+                       shell = pwd->pw_shell;
+                       iscsh = UNSET;
+               } else {
+                       shell = "/bin/sh";
+                       iscsh = NO;
                }
                }
+
+       /* if we're forking a csh, we want to slightly muck the args */
+       if (iscsh == UNSET) {
+               if (p = rindex(shell, '/'))
+                       ++p;
+               else
+                       p = shell;
+               iscsh = strcmp(p, "csh") ? NO : YES;
        }
        }
+
+       /* set permissions */
        if (setgid(pwd->pw_gid) < 0) {
                perror("su: setgid");
        if (setgid(pwd->pw_gid) < 0) {
                perror("su: setgid");
-               exit(3);
+               exit(1);
        }
        if (initgroups(user, pwd->pw_gid)) {
                fprintf(stderr, "su: initgroups failed\n");
        }
        if (initgroups(user, pwd->pw_gid)) {
                fprintf(stderr, "su: initgroups failed\n");
-               exit(4);
+               exit(1);
        }
        if (setuid(pwd->pw_uid) < 0) {
                perror("su: setuid");
        }
        if (setuid(pwd->pw_uid) < 0) {
                perror("su: setuid");
-               exit(5);
-       }
-       if (pwd->pw_shell && *pwd->pw_shell)
-               shell = pwd->pw_shell;
-       if (fulllogin) {
-               cleanenv[4] = getenv("TERM");
-               environ = cleanenv;
+               exit(1);
        }
        }
-       if (strcmp(user, "root"))
-               setenv("USER", pwd->pw_name, userbuf);
-       setenv("SHELL", shell, shellbuf);
-       setenv("HOME", pwd->pw_dir, homebuf);
-       setpriority(PRIO_PROCESS, 0, 0);
-       if (fastlogin) {
-               *argv-- = "-f";
-               *argv = "su";
-       } else if (fulllogin) {
-               if (chdir(pwd->pw_dir) < 0) {
-                       fprintf(stderr, "No directory\n");
-                       exit(6);
-               }
-               *argv = "-su";
-       } else
-               *argv = "su";
-       execv(shell, argv);
-       fprintf(stderr, "No shell\n");
-       exit(7);
-}
 
 
-setenv(ename, eval, buf)
-       char *ename, *eval, *buf;
-{
-       register char *cp, *dp;
-       register char **ep = environ;
-
-       /*
-        * this assumes an environment variable "ename" already exists
-        */
-       while (dp = *ep++) {
-               for (cp = ename; *cp == *dp && *cp; cp++, dp++)
-                       continue;
-               if (*cp == 0 && (*dp == '=' || *dp == 0)) {
-                       strcat(buf, eval);
-                       *--ep = buf;
-                       return;
+       if (!asme) {
+               if (fulllogin) {
+                       p = getenv("TERM");
+                       cleanenv[0] = "PATH=:/usr/ucb:/bin:/usr/bin";
+                       cleanenv[1] = NULL;
+                       environ = cleanenv;
+                       (void)setenv("TERM", p, 1);
+                       if (chdir(pwd->pw_dir) < 0) {
+                               fprintf(stderr, "su: no directory\n");
+                               exit(1);
+                       }
                }
                }
+               if (fulllogin || pwd->pw_uid)
+                       (void)setenv("USER", pwd->pw_name, 1);
+               (void)setenv("HOME", pwd->pw_dir, 1);
+               (void)setenv("SHELL", shell, 1);
        }
        }
+
+       if (iscsh == YES) {
+               if (fastlogin)
+                       *np-- = "-f";
+               if (asme)
+                       *np-- = "-m";
+       }
+
+       /* csh strips the first character... */
+       *np = fulllogin ? "-su" : iscsh == YES ? "_su" : "su";
+
+       if (pwd->pw_uid == 0)
+               syslog(LOG_NOTICE|LOG_AUTH, "su: %s on %s",
+                   username, ttyname(2));
+
+       (void)setpriority(PRIO_PROCESS, 0, prio);
+
+       execv(shell, np);
+       fprintf(stderr, "su: no shell.\n");
+       exit(1);
 }
 
 }
 
-char *
-getenv(ename)
-       char *ename;
+chshell(sh)
+       char *sh;
 {
 {
-       register char *cp, *dp;
-       register char **ep = environ;
-
-       while (dp = *ep++) {
-               for (cp = ename; *cp == *dp && *cp; cp++, dp++)
-                       continue;
-               if (*cp == 0 && (*dp == '=' || *dp == 0))
-                       return (*--ep);
-       }
-       return ((char *)0);
+       char *cp, *getusershell();
+
+       while ((cp = getusershell()) != NULL)
+               if (!strcmp(cp, sh))
+                       return(1);
+       return(0);
 }
 }
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.