275c2fc980
gain us anything to run as the user since an attacker can just have an setuid(0) in their egg. Running as root solves potential problems wrt signalling.
220 lines
6.1 KiB
C
220 lines
6.1 KiB
C
/*
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* Copyright (c) 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_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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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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#include <sys/param.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <time.h>
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#include "sudo.h"
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#include "sudo_auth.h"
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#include "insults.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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sudo_auth auth_switch[] = {
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#ifdef AUTH_STANDALONE
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AUTH_STANDALONE
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#else
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# ifndef WITHOUT_PASSWD
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AUTH_ENTRY(0, "passwd", NULL, NULL, passwd_verify, NULL)
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# endif
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# if defined(HAVE_SECUREWARE) && !defined(WITHOUT_PASSWD)
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AUTH_ENTRY(0, "secureware", secureware_init, NULL, secureware_verify, NULL)
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# endif
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# ifdef HAVE_AFS
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AUTH_ENTRY(0, "afs", NULL, NULL, afs_verify, NULL)
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# endif
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# ifdef HAVE_KERB4
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AUTH_ENTRY(0, "kerb4", kerb4_init, NULL, kerb4_verify, NULL)
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# endif
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# ifdef HAVE_KERB5
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AUTH_ENTRY(0, "kerb5", kerb5_init, NULL, kerb5_verify, NULL)
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# endif
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# ifdef HAVE_SKEY
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AUTH_ENTRY(0, "S/Key", NULL, rfc1938_setup, rfc1938_verify, NULL)
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# endif
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# ifdef HAVE_OPIE
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AUTH_ENTRY(0, "OPIE", NULL, rfc1938_setup, rfc1938_verify, NULL)
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# endif
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#endif /* AUTH_STANDALONE */
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AUTH_ENTRY(0, NULL, NULL, NULL, NULL, NULL)
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};
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int nil_pw; /* I hate resorting to globals like this... */
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void
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verify_user()
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{
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short counter = TRIES_FOR_PASSWORD + 1;
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short success = AUTH_FAILURE;
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short status;
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char *p;
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sudo_auth *auth;
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/* Set FLAG_ONEANDONLY if there is only one auth method. */
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if (auth_switch[0].name && !auth_switch[1].name)
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auth_switch[0].flags |= FLAG_ONEANDONLY;
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/* Initialize auth methods and unconfigure the method if necessary. */
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for (auth = auth_switch; auth->name; auth++) {
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if (auth->init && IS_CONFIGURED(auth)) {
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if (NEEDS_USER(auth))
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set_perms(PERM_USER, 0);
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status = (auth->init)(sudo_user.pw, &user_prompt, auth);
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if (status == AUTH_FAILURE)
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auth->flags &= ~FLAG_CONFIGURED;
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else if (status == AUTH_FATAL) /* XXX log */
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exit(1); /* assume error msg already printed */
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if (NEEDS_USER(auth))
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set_perms(PERM_ROOT, 0);
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}
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}
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while (--counter) {
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/* Do any per-method setup and unconfigure the method if needed */
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for (auth = auth_switch; auth->name; auth++) {
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if (auth->setup && IS_CONFIGURED(auth)) {
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if (NEEDS_USER(auth))
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set_perms(PERM_USER, 0);
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status = (auth->setup)(sudo_user.pw, &user_prompt, auth);
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if (status == AUTH_FAILURE)
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auth->flags &= ~FLAG_CONFIGURED;
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else if (status == AUTH_FATAL) /* XXX log */
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exit(1); /* assume error msg already printed */
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if (NEEDS_USER(auth))
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set_perms(PERM_ROOT, 0);
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}
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}
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/* Get the password unless the auth function will do it for us */
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nil_pw = 0;
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#if defined(AUTH_STANDALONE)
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p = user_prompt;
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#else
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p = (char *) tgetpass(user_prompt, PASSWORD_TIMEOUT * 60, 1);
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if (!p || *p == '\0')
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nil_pw = 1;
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#endif /* AUTH_STANDALONE */
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/* Call authentication functions. */
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for (auth = auth_switch; auth->name; auth++) {
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if (!IS_CONFIGURED(auth))
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continue;
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if (NEEDS_USER(auth))
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set_perms(PERM_USER, 0);
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success = auth->status = (auth->verify)(sudo_user.pw, p, auth);
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(void) memset(p, 0, strlen(p));
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if (NEEDS_USER(auth))
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set_perms(PERM_ROOT, 0);
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if (auth->status != AUTH_FAILURE)
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goto cleanup;
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}
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/* Exit loop on nil password, but give it a chance to match first. */
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if (nil_pw) {
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if (counter == TRIES_FOR_PASSWORD)
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exit(1);
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else
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break;
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}
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pass_warn(stderr);
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}
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cleanup:
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/* Call cleanup routines. */
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for (auth = auth_switch; auth->name; auth++) {
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if (auth->cleanup && IS_CONFIGURED(auth)) {
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if (NEEDS_USER(auth))
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set_perms(PERM_USER, 0);
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status = (auth->cleanup)(sudo_user.pw, auth);
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if (status == AUTH_FATAL) /* XXX log */
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exit(1); /* assume error msg already printed */
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if (NEEDS_USER(auth))
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set_perms(PERM_ROOT, 0);
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}
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}
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switch (success) {
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case AUTH_SUCCESS:
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return;
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case AUTH_FAILURE:
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log_error(NO_MAIL, "%d incorrect password attempt%s",
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TRIES_FOR_PASSWORD - counter,
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(TRIES_FOR_PASSWORD - counter == 1) ? "" : "s");
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case AUTH_FATAL:
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exit(1);
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}
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}
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void
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pass_warn(fp)
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FILE *fp;
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{
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#ifdef USE_INSULTS
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(void) fprintf(fp, "%s\n", INSULT);
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#else
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(void) fprintf(fp, "%s\n", INCORRECT_PASSWORD);
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#endif /* USE_INSULTS */
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}
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