d40947c0b0
add a flag to specify an auth method is running alone (the only one). Pass auth methods their sudo_auth pointer, not the data pointer. This allows us to get at the flags and tell if we are the only auth method. That, in turn, allows the method to be able to decide what should/should not be a fatal error. Currently only rfc1938 uses it this way, which allows us to kill the OTP_ONLY define and te hackery that went with it. With access to the sudo_auth struct, methods can also get at a string holding their cannonical name (useful in error messages).
148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
/*
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* Copyright (c) 1994-1996,1998-1999 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_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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#if defined(HAVE_SKEY)
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#include <skey.h>
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#define RFC1938 skey
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#define rfc1938challenge skeychallenge
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#define rfc1938verify skeyverify
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#elif defined(HAVE_OPIE)
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#include <opie.h>
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#define RFC1938 opie
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#define rfc1938challenge opiechallenge
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#define rfc1938verify opieverify
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#endif
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#include "sudo.h"
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#include "sudo_auth.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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int
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rfc1938_setup(pw, promptp, auth)
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struct passwd *pw;
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char **promptp;
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sudo_auth *auth;
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{
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char challenge[256];
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static char *orig_prompt = NULL, *new_prompt = NULL;
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static int op_len, np_size;
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static struct RFC1938 rfc1938;
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/* Stash a pointer to the rfc1938 struct if we have not initialized */
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if (!auth->data)
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auth->data = &rfc1938;
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/* Save the original prompt */
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if (orig_prompt == NULL) {
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orig_prompt = *promptp;
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op_len = strlen(orig_prompt);
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/* Ignore trailing colon (we will add our own) */
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if (orig_prompt[op_len - 1] == ':')
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op_len--;
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}
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#ifdef HAVE_SKEY
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/* Close old stream */
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if (rfc1938.keyfile)
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(void) fclose(rfc1938.keyfile);
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#endif
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/*
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* Look up the user and get the rfc1938 challenge.
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* If the user is not in the OTP db, only post a fatal error if
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* we are running alone (since they may just use a normal passwd).
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*/
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if (rfc1938challenge(&rfc1938, pw->pw_name, challenge) != 0) {
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if (IS_ONEANDONLY(auth)) {
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(void) fprintf(stderr,
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"%s: You do not exist in the %s database.\n",
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Argv[0], auth->name);
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return(AUTH_FATAL);
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} else {
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return(AUTH_FAILURE);
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}
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}
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/* Get space for new prompt with embedded challenge */
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if (np_size < op_len + strlen(challenge) + 7) {
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np_size = op_len + strlen(challenge) + 7;
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new_prompt = (char *) erealloc(new_prompt, np_size);
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}
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#ifdef LONG_OTP_PROMPT
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(void) sprintf(new_prompt, "%s\n%s", challenge, orig_prompt);
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#else
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(void) sprintf(new_prompt, "%.*s [ %s ]:", op_len, orig_prompt, challenge);
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#endif /* LONG_OTP_PROMPT */
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*promptp = new_prompt;
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return(AUTH_SUCCESS);
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}
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int
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rfc1938_verify(pw, pass, auth)
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struct passwd *pw;
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char *pass;
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sudo_auth *auth;
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{
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if (rfc1938verify((struct RFC1938 *) auth->data, pass) == 0)
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return(AUTH_SUCCESS);
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else
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return(AUTH_FAILURE);
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}
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