11127e3468
we don't inadvertantly leak an fd to the child. Apparently Linux's shadow routines leave the fd open even if you don't call setspent(). Reported by mike@gistnet.com; different patch used.
270 lines
6.6 KiB
C
270 lines
6.6 KiB
C
/*
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* Copyright (c) 1996, 1998, 1999 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* 4. Products derived from this software may not be called "Sudo" nor
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* may "Sudo" appear in their names without specific prior written
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* permission from the author.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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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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#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_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_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/stat.h>
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#include <sys/param.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_GETPRPWNAM
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# ifdef __hpux
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# undef MAXINT
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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_GETPRPWNAM */
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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 lint
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static const char rcsid[] = "$Sudo$";
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#endif /* lint */
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/*
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* Global variables (yuck)
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*/
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#if defined(HAVE_GETPRPWNAM) && defined(__alpha)
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int crypt_type = INT_MAX;
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#endif /* HAVE_GETPRPWNAM && __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 struct passwd *sudo_pwdup __P((struct passwd *));
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/*
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* Return the user's shell based on either the SHELL environment variable
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* (already assigned to user_shell) or, failing that, the passwd(5) entry.
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*/
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static char *
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sudo_getshell(pw)
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struct passwd *pw;
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{
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char *pw_shell;
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if ((pw_shell = user_shell) == NULL)
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pw_shell = pw->pw_shell;
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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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return(pw_shell);
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}
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/*
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* Return a copy of the encrypted password for the user described by pw.
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* If shadow passwords are in use, look in the shadow file.
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*/
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char *
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sudo_getepw(pw)
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struct passwd *pw;
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{
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char *epw;
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/* If there is a function to check for shadow enabled, use it... */
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#ifdef HAVE_ISCOMSEC
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if (!iscomsec())
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return(estrdup(pw->pw_passwd));
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#endif /* HAVE_ISCOMSEC */
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#ifdef HAVE_ISSECURE
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if (!issecure())
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return(estrdup(pw->pw_passwd));
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#endif /* HAVE_ISSECURE */
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epw = NULL;
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#ifdef HAVE_GETPRPWNAM
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{
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struct pr_passwd *spw;
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setprpwent();
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if ((spw = getprpwnam(pw->pw_name)) && spw->ufld.fd_encrypt) {
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# ifdef __alpha
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crypt_type = spw->ufld.fd_oldcrypt;
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# endif /* __alpha */
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epw = estrdup(spw->ufld.fd_encrypt);
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}
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endprpwent();
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if (epw)
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return(epw);
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}
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#endif /* HAVE_GETPRPWNAM */
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#ifdef HAVE_GETSPNAM
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{
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struct spwd *spw;
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setspent();
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if ((spw = getspnam(pw->pw_name)) && spw->sp_pwdp)
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epw = estrdup(spw->sp_pwdp);
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endspent();
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if (epw)
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return(epw);
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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;
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setspwent();
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if ((spw = getspwuid(pw->pw_uid)) && spw->pw_passwd)
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epw = estrdup(spw->pw_passwd);
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endspwent();
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if (epw)
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return(epw);
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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;
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setpwaent();
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if ((spw = getpwanam(pw->pw_name)) && spw->pwa_passwd)
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epw = estrdup(spw->pwa_passwd);
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endpwaent();
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if (epw)
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return(epw);
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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;
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setauthent();
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if ((spw = getauthuid(pw->pw_uid)) && spw->a_password)
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epw = estrdup(spw->a_password);
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endauthent();
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if (epw)
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return(epw);
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}
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#endif /* HAVE_GETAUTHUID */
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/* Fall back on normal password. */
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return(estrdup(pw->pw_passwd));
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}
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/*
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* Dynamically allocate space for a struct password and the constituent parts
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* that we care about. Fills in pw_passwd from shadow file if necessary.
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*/
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static struct passwd *
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sudo_pwdup(pw)
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struct passwd *pw;
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{
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struct passwd *local_pw;
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/* Allocate space for a local copy of pw. */
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local_pw = (struct passwd *) emalloc(sizeof(struct passwd));
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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, pw, sizeof(struct passwd));
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local_pw->pw_name = estrdup(pw->pw_name);
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local_pw->pw_dir = estrdup(pw->pw_dir);
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local_pw->pw_gecos = estrdup(pw->pw_gecos);
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#ifdef HAVE_LOGIN_CAP_H
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local_pw->pw_class = estrdup(pw->pw_class);
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#endif
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/* pw_shell is a special case since we overide with $SHELL */
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local_pw->pw_shell = estrdup(sudo_getshell(pw));
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/* pw_passwd gets a shadow password if applicable */
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local_pw->pw_passwd = sudo_getepw(pw);
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return(local_pw);
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}
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/*
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* Get a password entry by uid and allocate space for it.
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* Fills in pw_passwd from shadow file if necessary.
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*/
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struct passwd *
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sudo_getpwuid(uid)
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uid_t uid;
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{
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struct passwd *pw;
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if ((pw = getpwuid(uid)) == NULL)
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return(NULL);
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else
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return(sudo_pwdup(pw));
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}
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/*
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* Get a password entry by name and allocate space for it.
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* Fills in pw_passwd from shadow file if necessary.
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*/
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struct passwd *
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sudo_getpwnam(name)
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const char *name;
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{
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struct passwd *pw;
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if ((pw = getpwnam(name)) == NULL)
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return(NULL);
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else
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return(sudo_pwdup(pw));
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}
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