252 lines
6.5 KiB
C
252 lines
6.5 KiB
C
/*
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* CU sudo version 1.5.7
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 1, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Please send bugs, changes, problems to sudo-bugs@courtesan.com
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*
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*******************************************************************
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*
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* This module contains sudo_getpwuid(), a function that
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* Makes a dynamic copy of the struct passwd returned by
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* getpwuid() and substitutes the shadow password if
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* necesary.
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*
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* Todd C. Miller Mon Nov 20 13:53:06 MST 1995
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*/
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#ifndef lint
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static char rcsid[] = "$Id$";
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#endif /* lint */
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#include "config.h"
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#include <stdio.h>
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#ifdef STDC_HEADERS
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#include <stdlib.h>
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#endif /* STDC_HEADERS */
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#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
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#include <malloc.h>
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#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <pwd.h>
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#ifdef HAVE_GETSPNAM
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# include <shadow.h>
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#endif /* HAVE_GETSPNAM */
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#ifdef HAVE_GETPRPWUID
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# ifdef __hpux
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# include <hpsecurity.h>
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# else
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# include <sys/security.h>
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# endif /* __hpux */
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# include <prot.h>
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#endif /* HAVE_GETPRPWUID */
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#ifdef HAVE_GETPWANAM
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# include <sys/label.h>
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# include <sys/audit.h>
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# include <pwdadj.h>
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#endif /* HAVE_GETPWANAM */
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#ifdef HAVE_GETAUTHUID
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# include <auth.h>
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#endif /* HAVE_GETAUTHUID */
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#include "sudo.h"
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#ifndef STDC_HEADERS
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#ifndef __GNUC__ /* gcc has its own malloc */
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extern char *malloc __P((size_t));
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#endif /* __GNUC__ */
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extern char *getenv __P((const char *));
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#ifdef HAVE_STRDUP
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extern char *strdup __P((const char *));
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#endif /* HAVE_STRDUP */
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#endif /* !STDC_HEADERS */
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/*
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* Global variables (yuck)
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*/
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#if defined(HAVE_GETPRPWUID) && defined(__alpha)
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int crypt_type = -1;
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#endif /* HAVE_GETPRPWUID && __alpha */
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/*
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* Local functions not visible outside getspwuid.c
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*/
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static char *sudo_getshell __P((struct passwd *));
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static char *sudo_getepw __P((struct passwd *));
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/**********************************************************************
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*
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* sudo_getshell()
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*
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* This function returns the user's shell based on either the
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* SHELL evariable or the passwd(5) entry (in that order).
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*/
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static char *sudo_getshell(pw_ent)
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struct passwd *pw_ent;
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{
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char *pw_shell;
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if ((pw_shell = getenv("SHELL")) == NULL)
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pw_shell = pw_ent -> pw_shell;
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#ifdef _PATH_BSHELL
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/* empty string "" means bourne shell */
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if (*pw_shell == '\0')
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pw_shell = _PATH_BSHELL;
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#endif /* _PATH_BSHELL */
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return(pw_shell);
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}
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/**********************************************************************
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*
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* sudo_getepw()
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*
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* This function returns the encrypted password for the user described
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* by pw_ent. If there is a shadow password it is returned, else the
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* normal UN*X password is returned instead.
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*/
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static char *sudo_getepw(pw_ent)
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struct passwd *pw_ent;
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{
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#ifdef HAVE_GETPRPWUID
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{
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struct pr_passwd *spw_ent;
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spw_ent = getprpwuid(pw_ent->pw_uid);
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if (spw_ent != NULL && spw_ent->ufld.fd_encrypt != NULL) {
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# ifdef __alpha
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crypt_type = spw_ent -> ufld.fd_oldcrypt;
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# endif /* __alpha */
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return(spw_ent -> ufld.fd_encrypt);
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}
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}
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#endif /* HAVE_GETPRPWUID */
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#ifdef HAVE_GETSPNAM
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{
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struct spwd *spw_ent;
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if ((spw_ent = getspnam(pw_ent -> pw_name)) && spw_ent -> sp_pwdp)
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return(spw_ent -> sp_pwdp);
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}
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#endif /* HAVE_GETSPNAM */
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#ifdef HAVE_GETSPWUID
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{
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struct s_passwd *spw_ent;
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if ((spw_ent = getspwuid(pw_ent -> pw_uid)) && spw_ent -> pw_passwd)
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return(spw_ent -> pw_passwd);
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}
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#endif /* HAVE_GETSPWUID */
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#ifdef HAVE_GETPWANAM
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{
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struct passwd_adjunct *spw_ent;
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if ((spw_ent = getpwanam(pw_ent -> pw_name)) && spw_ent -> pwa_passwd)
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return(spw_ent -> pwa_passwd);
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}
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#endif /* HAVE_GETPWANAM */
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#ifdef HAVE_GETAUTHUID
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{
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AUTHORIZATION *spw_ent;
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if ((spw_ent = getauthuid(pw_ent -> pw_uid)) && spw_ent -> a_password)
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return(spw_ent -> a_password);
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}
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#endif /* HAVE_GETAUTHUID */
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/* Fall back on normal passwd */
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return(pw_ent->pw_passwd);
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}
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/**********************************************************************
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*
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* sudo_getpwuid()
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*
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* This function dynamically allocates space for a struct password
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* and the constituent parts that we care about. If shadow passwords
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* are in use, it substitutes the shadow password for pw_passwd.
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*/
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struct passwd *sudo_getpwuid(uid)
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uid_t uid;
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{
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struct passwd *pw_ent, *local_pw_ent;
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if ((pw_ent = getpwuid(uid)) == NULL)
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return(NULL);
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/* allocate space for a local copy of pw_ent */
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local_pw_ent = (struct passwd *) malloc(sizeof(struct passwd));
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if (local_pw_ent == NULL) {
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perror("malloc");
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(void) fprintf(stderr, "%s: cannot allocate memory!\n", Argv[0]);
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exit(1);
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}
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/*
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* Copy the struct passwd and the interesting strings...
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*/
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(void) memcpy(local_pw_ent, pw_ent, sizeof(struct passwd));
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local_pw_ent->pw_name = (char *) strdup(pw_ent->pw_name);
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if (local_pw_ent->pw_name == NULL) {
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perror("malloc");
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(void) fprintf(stderr, "%s: cannot allocate memory!\n", Argv[0]);
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exit(1);
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}
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local_pw_ent->pw_dir = (char *) strdup(pw_ent->pw_dir);
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if (local_pw_ent->pw_dir == NULL) {
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perror("malloc");
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(void) fprintf(stderr, "%s: cannot allocate memory!\n", Argv[0]);
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exit(1);
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}
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/* pw_shell is a special case since we overide with $SHELL */
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local_pw_ent->pw_shell = (char *) strdup(sudo_getshell(pw_ent));
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if (local_pw_ent->pw_shell == NULL) {
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perror("malloc");
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(void) fprintf(stderr, "%s: cannot allocate memory!\n", Argv[0]);
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exit(1);
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}
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/* pw_passwd gets a shadow password if applicable */
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local_pw_ent->pw_passwd = (char *) strdup(sudo_getepw(pw_ent));
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if (local_pw_ent->pw_passwd == NULL) {
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perror("malloc");
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(void) fprintf(stderr, "%s: cannot allocate memory!\n", Argv[0]);
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exit(1);
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}
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return(local_pw_ent);
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}
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