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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 1b14749..3ab051e 100644 (file)
--- a/usr/src/usr.bin/su/su.c
+++ b/usr/src/usr.bin/su/su.c
@@ -1,105 +1,184 @@
-static char *sccsid = "@(#)su.c        4.3 (Berkeley) 4.3";
+/*
+ * Copyright (c) 1980 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1980 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif not lint
+
+#ifndef lint
+static char sccsid[] = "@(#)su.c       5.3 (Berkeley) %G%";
+#endif not lint
+
 #include <stdio.h>
 #include <pwd.h>
 #include <stdio.h>
 #include <pwd.h>
+#include <grp.h>
+#include <syslog.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
 
 
-struct passwd *pwd,*getpwnam();
+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   *crypt();
 char   *getpass();
+char   *getenv();
 
 main(argc,argv)
 
 main(argc,argv)
-int    argc;
-char   **argv;
+       int argc;
+       char *argv[];
 {
 {
-       char *nptr;
        char *password;
        char *password;
-       int badsw = 0;
-       char *shell = "/bin/sh";
-       int niced = 0;
+       char buf[1000];
+       FILE *fp;
+
+       openlog("su", LOG_ODELAY, LOG_AUTH);
 
 
-       if(argc > 1)
-               nptr = argv[1];
-       else {
-               nptr = "root";
-               nice(-4);
-               niced = -4;
+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((pwd=getpwnam(nptr)) == NULL) {
-               printf("Unknown id: %s\n",nptr);
+       if (argc > 1 && argv[1][0] != '-') {
+               user = argv[1];
+               argc--, argv++;
+       }
+       if ((pwd = getpwuid(getuid())) == NULL) {
+               fprintf(stderr, "Who are you?\n");
+               exit(1);
+       }
+       strcpy(buf, pwd->pw_name);
+       if ((pwd = getpwnam(user)) == NULL) {
+               fprintf(stderr, "Unknown login: %s\n", user);
                exit(1);
        }
                exit(1);
        }
-       if(pwd->pw_passwd[0] == '\0' || getuid() == 0)
+       /*
+        * 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:");
                goto ok;
        password = getpass("Password:");
-       if(badsw || (strcmp(pwd->pw_passwd, crypt(password, pwd->pw_passwd)) != 0)) {
-bad:
-               printf("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);
-                       }
+       if (strcmp(pwd->pw_passwd, crypt(password, pwd->pw_passwd)) != 0) {
+               fprintf(stderr, "Sorry\n");
+               if (pwd->pw_uid == 0) {
+                       syslog(LOG_CRIT, "BAD SU %s on %s",
+                                       getlogin(), ttyname(2));
                }
                exit(2);
        }
 ok:
        endpwent();
                }
                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 (pwd->pw_uid == 0) {
+               syslog(LOG_NOTICE, "%s on %s", getlogin(), ttyname(2));
+               closelog();
+       }
+       if (setgid(pwd->pw_gid) < 0) {
+               perror("su: setgid");
+               exit(3);
+       }
+       if (initgroups(user, pwd->pw_gid)) {
+               fprintf(stderr, "su: initgroups failed\n");
+               exit(4);
+       }
+       if (setuid(pwd->pw_uid) < 0) {
+               perror("su: setuid");
+               exit(5);
        }
        }
-       setgid(pwd->pw_gid);
-       initgroups(nptr, pwd->pw_gid);
-       setuid(pwd->pw_uid);
        if (pwd->pw_shell && *pwd->pw_shell)
                shell = pwd->pw_shell;
        if (pwd->pw_shell && *pwd->pw_shell)
                shell = pwd->pw_shell;
-       homeis(pwd->pw_dir);
-       shellis(shell);
-       nice(-niced);
-       execl(shell, "su", 0);
-       printf("No shell\n");
-       exit(3);
+       if (fulllogin) {
+               cleanenv[4] = getenv("TERM");
+               environ = cleanenv;
+       }
+       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);
 }
 
 }
 
-char   **environ;
-
-homeis(hp)
-       char *hp;
+setenv(ename, eval, buf)
+       char *ename, *eval, *buf;
 {
        register char *cp, *dp;
        register char **ep = environ;
 {
        register char *cp, *dp;
        register char **ep = environ;
-       static char homebuf[128];
 
 
+       /*
+        * this assumes an environment variable "ename" already exists
+        */
        while (dp = *ep++) {
        while (dp = *ep++) {
-               for (cp = "HOME"; *cp == *dp && *cp; cp++, dp++)
+               for (cp = ename; *cp == *dp && *cp; cp++, dp++)
                        continue;
                if (*cp == 0 && (*dp == '=' || *dp == 0)) {
                        continue;
                if (*cp == 0 && (*dp == '=' || *dp == 0)) {
-                       strcpy(homebuf, "HOME=");
-                       strcat(homebuf, hp);
-                       *--ep = homebuf;
+                       strcat(buf, eval);
+                       *--ep = buf;
                        return;
                }
        }
 }
 
                        return;
                }
        }
 }
 
-shellis(sp)
-       char *sp;
+char *
+getenv(ename)
+       char *ename;
 {
        register char *cp, *dp;
        register char **ep = environ;
 {
        register char *cp, *dp;
        register char **ep = environ;
-       static char shellbuf[128];
 
        while (dp = *ep++) {
 
        while (dp = *ep++) {
-               for (cp = "SHELL"; *cp == *dp && *cp; cp++, dp++)
+               for (cp = ename; *cp == *dp && *cp; cp++, dp++)
                        continue;
                        continue;
-               if (*cp == 0 && (*dp == '=' || *dp == 0)) {
-                       strcpy(shellbuf, "SHELL=");
-                       strcat(shellbuf, sp);
-                       *--ep = shellbuf;
-                       return;
-               }
+               if (*cp == 0 && (*dp == '=' || *dp == 0))
+                       return (*--ep);
        }
        }
+       return ((char *)0);
 }
 }
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.