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Ben Lindstrom
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f569241db2
215
auth-skey.c
215
auth-skey.c
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/*
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* Copyright (c) 1999,2000 Markus Friedl. 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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* 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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* 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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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: auth-skey.c,v 1.9 2000/10/19 16:41:13 deraadt Exp $");
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#ifdef SKEY
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#include "ssh.h"
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#include "packet.h"
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#include <openssl/sha.h>
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/* from %OpenBSD: skeylogin.c,v 1.32 1999/08/16 14:46:56 millert Exp % */
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/*
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* try skey authentication,
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* return 1 on success, 0 on failure, -1 if skey is not available
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*/
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int
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auth_skey_password(struct passwd * pw, const char *password)
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{
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if (strncasecmp(password, "s/key", 5) == 0) {
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char *skeyinfo = skey_keyinfo(pw->pw_name);
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if (skeyinfo == NULL) {
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debug("generating fake skeyinfo for %.100s.",
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pw->pw_name);
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skeyinfo = skey_fake_keyinfo(pw->pw_name);
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}
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if (skeyinfo != NULL)
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packet_send_debug("%s", skeyinfo);
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/* Try again. */
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return 0;
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} else if (skey_haskey(pw->pw_name) == 0 &&
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skey_passcheck(pw->pw_name, (char *) password) != -1) {
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/* Authentication succeeded. */
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return 1;
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}
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/* Fall back to ordinary passwd authentication. */
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return -1;
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}
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/* from %OpenBSD: skeylogin.c,v 1.32 1999/08/16 14:46:56 millert Exp % */
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#define ROUND(x) (((x)[0] << 24) + (((x)[1]) << 16) + (((x)[2]) << 8) + \
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((x)[3]))
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/*
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* hash_collapse()
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*/
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static u_int32_t
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hash_collapse(s)
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u_char *s;
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{
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int len, target;
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u_int32_t i;
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if ((strlen(s) % sizeof(u_int32_t)) == 0)
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target = strlen(s); /* Multiple of 4 */
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else
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target = strlen(s) - (strlen(s) % sizeof(u_int32_t));
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for (i = 0, len = 0; len < target; len += 4)
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i ^= ROUND(s + len);
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return i;
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}
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char *
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skey_fake_keyinfo(char *username)
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{
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int i;
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u_int ptr;
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u_char hseed[SKEY_MAX_SEED_LEN], flg = 1, *up;
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char pbuf[SKEY_MAX_PW_LEN+1];
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static char skeyprompt[SKEY_MAX_CHALLENGE+1];
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char *secret = NULL;
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size_t secretlen = 0;
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SHA_CTX ctx;
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char *p, *u;
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/*
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* Base first 4 chars of seed on hostname.
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* Add some filler for short hostnames if necessary.
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*/
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if (gethostname(pbuf, sizeof(pbuf)) == -1)
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*(p = pbuf) = '.';
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else
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for (p = pbuf; *p && isalnum(*p); p++)
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if (isalpha(*p) && isupper(*p))
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*p = tolower(*p);
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if (*p && pbuf - p < 4)
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(void)strncpy(p, "asjd", 4 - (pbuf - p));
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pbuf[4] = '\0';
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/* Hash the username if possible */
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up = malloc(SHA_DIGEST_LENGTH);
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if (up != NULL) {
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struct stat sb;
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time_t t;
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int fd;
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SHA1_Init(&ctx);
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SHA1_Update(&ctx, username, strlen(username));
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SHA1_Final(up, &ctx);
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/* Collapse the hash */
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ptr = hash_collapse(up);
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memset(up, 0, strlen(up));
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/* See if the random file's there, else use ctime */
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if ((fd = open(_SKEY_RAND_FILE_PATH_, O_RDONLY)) != -1
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&& fstat(fd, &sb) == 0 &&
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sb.st_size > (off_t)SKEY_MAX_SEED_LEN &&
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lseek(fd, ptr % (sb.st_size - SKEY_MAX_SEED_LEN),
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SEEK_SET) != -1 && read(fd, hseed,
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SKEY_MAX_SEED_LEN) == SKEY_MAX_SEED_LEN) {
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close(fd);
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fd = -1;
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secret = hseed;
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secretlen = SKEY_MAX_SEED_LEN;
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flg = 0;
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} else if (!stat(_PATH_MEM, &sb) || !stat("/", &sb)) {
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t = sb.st_ctime;
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secret = ctime(&t);
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secretlen = strlen(secret);
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flg = 0;
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}
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if (fd != -1)
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close(fd);
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}
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/* Put that in your pipe and smoke it */
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if (flg == 0) {
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/* Hash secret value with username */
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SHA1_Init(&ctx);
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SHA1_Update(&ctx, secret, secretlen);
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SHA1_Update(&ctx, username, strlen(username));
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SHA1_Final(up, &ctx);
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/* Zero out */
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memset(secret, 0, secretlen);
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/* Now hash the hash */
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SHA1_Init(&ctx);
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SHA1_Update(&ctx, up, strlen(up));
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SHA1_Final(up, &ctx);
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ptr = hash_collapse(up + 4);
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for (i = 4; i < 9; i++) {
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pbuf[i] = (ptr % 10) + '0';
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ptr /= 10;
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}
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pbuf[i] = '\0';
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/* Sequence number */
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ptr = ((up[2] + up[3]) % 99) + 1;
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memset(up, 0, SHA_DIGEST_LENGTH); /* SHA1 specific */
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free(up);
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(void)snprintf(skeyprompt, sizeof skeyprompt,
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"otp-%.*s %d %.*s",
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SKEY_MAX_HASHNAME_LEN,
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skey_get_algorithm(),
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ptr, SKEY_MAX_SEED_LEN,
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pbuf);
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} else {
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/* Base last 8 chars of seed on username */
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u = username;
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i = 8;
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p = &pbuf[4];
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do {
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if (*u == 0) {
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/* Pad remainder with zeros */
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while (--i >= 0)
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*p++ = '0';
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break;
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}
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*p++ = (*u++ % 10) + '0';
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} while (--i != 0);
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pbuf[12] = '\0';
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(void)snprintf(skeyprompt, sizeof skeyprompt,
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"otp-%.*s %d %.*s",
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SKEY_MAX_HASHNAME_LEN,
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skey_get_algorithm(),
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99, SKEY_MAX_SEED_LEN, pbuf);
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}
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return skeyprompt;
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}
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#endif /* SKEY */
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107
auth2-skey.c
107
auth2-skey.c
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@ -1,107 +0,0 @@
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#include "includes.h"
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RCSID("$OpenBSD: auth2-skey.c,v 1.2 2000/12/19 23:17:55 markus Exp $");
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#ifdef SKEY
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#include "ssh.h"
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#include "ssh2.h"
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#include "auth.h"
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#include "packet.h"
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#include "xmalloc.h"
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#include "dispatch.h"
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void send_userauth_into_request(Authctxt *authctxt, int echo);
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void input_userauth_info_response(int type, int plen, void *ctxt);
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/*
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* try skey authentication, always return -1 (= postponed) since we have to
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* wait for the s/key response.
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*/
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int
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auth2_skey(Authctxt *authctxt)
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{
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send_userauth_into_request(authctxt, 0);
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dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, &input_userauth_info_response);
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return -1;
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}
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void
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send_userauth_into_request(Authctxt *authctxt, int echo)
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{
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int retval = -1;
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struct skey skey;
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char challenge[SKEY_MAX_CHALLENGE];
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char *fake;
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if (authctxt->user == NULL)
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fatal("send_userauth_into_request: internal error: no user");
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/* get skey challenge */
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if (authctxt->valid)
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retval = skeychallenge(&skey, authctxt->user, challenge);
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if (retval == -1) {
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fake = skey_fake_keyinfo(authctxt->user);
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strlcpy(challenge, fake, sizeof challenge);
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}
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/* send our info request */
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packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
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packet_put_cstring("S/Key Authentication"); /* Name */
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packet_put_cstring(challenge); /* Instruction */
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packet_put_cstring(""); /* Language */
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packet_put_int(1); /* Number of prompts */
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packet_put_cstring(echo ?
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"Response [Echo]: ": "Response: "); /* Prompt */
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packet_put_char(echo); /* Echo */
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packet_send();
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packet_write_wait();
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memset(challenge, 'c', sizeof challenge);
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}
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void
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input_userauth_info_response(int type, int plen, void *ctxt)
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{
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Authctxt *authctxt = ctxt;
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int authenticated = 0;
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u_int nresp, rlen;
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char *resp, *method;
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if (authctxt == NULL)
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fatal("input_userauth_info_response: no authentication context");
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if (authctxt->attempt++ >= AUTH_FAIL_MAX)
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packet_disconnect("too many failed userauth_requests");
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nresp = packet_get_int();
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if (nresp == 1) {
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/* we only support s/key and assume s/key for nresp == 1 */
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method = "s/key";
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resp = packet_get_string(&rlen);
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packet_done();
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if (strlen(resp) == 0) {
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/*
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* if we received a null response, resend prompt with
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* echo enabled
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*/
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authenticated = -1;
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userauth_log(authctxt, authenticated, method);
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send_userauth_into_request(authctxt, 1);
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} else {
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/* verify skey response */
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if (authctxt->valid &&
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skey_haskey(authctxt->pw->pw_name) == 0 &&
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skey_passcheck(authctxt->pw->pw_name, resp) != -1) {
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authenticated = 1;
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} else {
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authenticated = 0;
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}
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memset(resp, 'r', rlen);
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/* unregister callback */
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dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
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userauth_log(authctxt, authenticated, method);
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userauth_reply(authctxt, authenticated);
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}
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xfree(resp);
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}
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}
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#endif /* SKEY */
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