--- old/usr/src/cmd/ssh/sshd/auth-rsa.c	Tue Aug 16 19:27:16 2016
+++ /dev/null	Tue Aug 16 19:26:53 2016
@@ -1,328 +0,0 @@
-/*
- * Author: Tatu Ylonen <ylo@cs.hut.fi>
- * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- *                    All rights reserved
- * RSA-based authentication.  This code determines whether to admit a login
- * based on RSA authentication.  This file also contains functions to check
- * validity of the host key.
- *
- * As far as I am concerned, the code I have written for this software
- * can be used freely for any purpose.  Any derived versions of this
- * software must be clearly marked as such, and if the derived work is
- * incompatible with the protocol description in the RFC file, it must be
- * called by a name other than "ssh" or "Secure Shell".
- */
-
-#include "includes.h"
-RCSID("$OpenBSD: auth-rsa.c,v 1.56 2002/06/10 16:53:06 stevesk Exp $");
-
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
-
-#include <openssl/rsa.h>
-#include <openssl/md5.h>
-
-#include "rsa.h"
-#include "packet.h"
-#include "xmalloc.h"
-#include "ssh1.h"
-#include "mpaux.h"
-#include "uidswap.h"
-#include "match.h"
-#include "auth-options.h"
-#include "pathnames.h"
-#include "log.h"
-#include "servconf.h"
-#include "auth.h"
-#include "hostfile.h"
-#include "ssh.h"
-
-/* import */
-extern ServerOptions options;
-
-/*
- * Session identifier that is used to bind key exchange and authentication
- * responses to a particular session.
- */
-extern u_char session_id[16];
-
-/*
- * The .ssh/authorized_keys file contains public keys, one per line, in the
- * following format:
- *   options bits e n comment
- * where bits, e and n are decimal numbers,
- * and comment is any string of characters up to newline.  The maximum
- * length of a line is 8000 characters.  See the documentation for a
- * description of the options.
- */
-
-BIGNUM *
-auth_rsa_generate_challenge(Key *key)
-{
-	BIGNUM *challenge;
-	BN_CTX *ctx;
-
-	if ((challenge = BN_new()) == NULL)
-		fatal("auth_rsa_generate_challenge: BN_new() failed");
-	/* Generate a random challenge. */
-	BN_rand(challenge, 256, 0, 0);
-	if ((ctx = BN_CTX_new()) == NULL)
-		fatal("auth_rsa_generate_challenge: BN_CTX_new() failed");
-	BN_mod(challenge, challenge, key->rsa->n, ctx);
-	BN_CTX_free(ctx);
-
-	return challenge;
-}
-
-int
-auth_rsa_verify_response(Key *key, BIGNUM *challenge, u_char response[16])
-{
-	u_char buf[32], mdbuf[16];
-	MD5_CTX md;
-	int len;
-
-	/* don't allow short keys */
-	if (BN_num_bits(key->rsa->n) < SSH_RSA_MINIMUM_MODULUS_SIZE) {
-		error("auth_rsa_verify_response: RSA modulus too small: %d < minimum %d bits",
-		    BN_num_bits(key->rsa->n), SSH_RSA_MINIMUM_MODULUS_SIZE);
-		return (0);
-	}
-
-	/* The response is MD5 of decrypted challenge plus session id. */
-	len = BN_num_bytes(challenge);
-	if (len <= 0 || len > 32)
-		fatal("auth_rsa_verify_response: bad challenge length %d", len);
-	memset(buf, 0, 32);
-	BN_bn2bin(challenge, buf + 32 - len);
-	MD5_Init(&md);
-	MD5_Update(&md, buf, 32);
-	MD5_Update(&md, session_id, 16);
-	MD5_Final(mdbuf, &md);
-
-	/* Verify that the response is the original challenge. */
-	if (memcmp(response, mdbuf, 16) != 0) {
-		/* Wrong answer. */
-		return (0);
-	}
-	/* Correct answer. */
-	return (1);
-}
-
-/*
- * Performs the RSA authentication challenge-response dialog with the client,
- * and returns true (non-zero) if the client gave the correct answer to
- * our challenge; returns zero if the client gives a wrong answer.
- */
-
-int
-auth_rsa_challenge_dialog(Key *key)
-{
-	BIGNUM *challenge, *encrypted_challenge;
-	u_char response[16];
-	int i, success;
-
-	if ((encrypted_challenge = BN_new()) == NULL)
-		fatal("auth_rsa_challenge_dialog: BN_new() failed");
-
-	challenge = auth_rsa_generate_challenge(key);
-
-	/* Encrypt the challenge with the public key. */
-	rsa_public_encrypt(encrypted_challenge, challenge, key->rsa);
-
-	/* Send the encrypted challenge to the client. */
-	packet_start(SSH_SMSG_AUTH_RSA_CHALLENGE);
-	packet_put_bignum(encrypted_challenge);
-	packet_send();
-	BN_clear_free(encrypted_challenge);
-	packet_write_wait();
-
-	/* Wait for a response. */
-	packet_read_expect(SSH_CMSG_AUTH_RSA_RESPONSE);
-	for (i = 0; i < 16; i++)
-		response[i] = packet_get_char();
-	packet_check_eom();
-
-	success = auth_rsa_verify_response(key, challenge, response);
-	BN_clear_free(challenge);
-	return (success);
-}
-
-/*
- * check if there's user key matching client_n,
- * return key if login is allowed, NULL otherwise
- */
-
-int
-auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
-{
-	char line[8192], *file;
-	int allowed = 0;
-	u_int bits;
-	FILE *f;
-	u_long linenum = 0;
-	struct stat st;
-	Key *key;
-
-	/* Temporarily use the user's uid. */
-	temporarily_use_uid(pw);
-
-	/* The authorized keys. */
-	file = authorized_keys_file(pw);
-	debug("trying public RSA key file %s", file);
-
-	/* Fail quietly if file does not exist */
-	if (stat(file, &st) < 0) {
-		/* Restore the privileged uid. */
-		restore_uid();
-		xfree(file);
-		return (0);
-	}
-	/* Open the file containing the authorized keys. */
-	f = fopen(file, "r");
-	if (!f) {
-		/* Restore the privileged uid. */
-		restore_uid();
-		xfree(file);
-		return (0);
-	}
-	if (options.strict_modes &&
-	    secure_filename(f, file, pw, line, sizeof(line)) != 0) {
-		xfree(file);
-		fclose(f);
-		log("Authentication refused: %s", line);
-		restore_uid();
-		return (0);
-	}
-
-	/* Flag indicating whether the key is allowed. */
-	allowed = 0;
-
-	key = key_new(KEY_RSA1);
-
-	/*
-	 * Go though the accepted keys, looking for the current key.  If
-	 * found, perform a challenge-response dialog to verify that the
-	 * user really has the corresponding private key.
-	 */
-	while (fgets(line, sizeof(line), f)) {
-		char *cp;
-		char *options;
-
-		linenum++;
-
-		/* Skip leading whitespace, empty and comment lines. */
-		for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
-			;
-		if (!*cp || *cp == '\n' || *cp == '#')
-			continue;
-
-		/*
-		 * Check if there are options for this key, and if so,
-		 * save their starting address and skip the option part
-		 * for now.  If there are no options, set the starting
-		 * address to NULL.
-		 */
-		if (*cp < '0' || *cp > '9') {
-			int quoted = 0;
-			options = cp;
-			for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) {
-				if (*cp == '\\' && cp[1] == '"')
-					cp++;	/* Skip both */
-				else if (*cp == '"')
-					quoted = !quoted;
-			}
-		} else
-			options = NULL;
-
-		/* Parse the key from the line. */
-		if (hostfile_read_key(&cp, &bits, key) == 0) {
-			debug("%.100s, line %lu: non ssh1 key syntax",
-			    file, linenum);
-			continue;
-		}
-		/* cp now points to the comment part. */
-
-		/* Check if the we have found the desired key (identified by its modulus). */
-		if (BN_cmp(key->rsa->n, client_n) != 0)
-			continue;
-
-		/* check the real bits  */
-		if (bits != BN_num_bits(key->rsa->n))
-			log("Warning: %s, line %lu: keysize mismatch: "
-			    "actual %d vs. announced %d.",
-			    file, linenum, BN_num_bits(key->rsa->n), bits);
-
-		/* We have found the desired key. */
-		/*
-		 * If our options do not allow this key to be used,
-		 * do not send challenge.
-		 */
-		if (!auth_parse_options(pw, options, file, linenum))
-			continue;
-
-		/* break out, this key is allowed */
-		allowed = 1;
-		break;
-	}
-
-	/* Restore the privileged uid. */
-	restore_uid();
-
-	/* Close the file. */
-	xfree(file);
-	fclose(f);
-
-	/* return key if allowed */
-	if (allowed && rkey != NULL)
-		*rkey = key;
-	else
-		key_free(key);
-	return (allowed);
-}
-
-/*
- * Performs the RSA authentication dialog with the client.  This returns
- * 0 if the client could not be authenticated, and 1 if authentication was
- * successful.  This may exit if there is a serious protocol violation.
- */
-int
-auth_rsa(struct passwd *pw, BIGNUM *client_n)
-{
-	Key *key;
-	char *fp;
-
-	/* no user given */
-	if (pw == NULL)
-		return 0;
-
-	if (!auth_rsa_key_allowed(pw, client_n, &key)) {
-		auth_clear_options();
-		return (0);
-	}
-
-	/* Perform the challenge-response dialog for this key. */
-	if (!auth_rsa_challenge_dialog(key)) {
-		/* Wrong response. */
-		verbose("Wrong response to RSA authentication challenge.");
-		packet_send_debug("Wrong response to RSA authentication challenge.");
-		/*
-		 * Break out of the loop. Otherwise we might send
-		 * another challenge and break the protocol.
-		 */
-		key_free(key);
-		return (0);
-	}
-	/*
-	 * Correct response.  The client has been successfully
-	 * authenticated. Note that we have not yet processed the
-	 * options; this will be reset if the options cause the
-	 * authentication to be rejected.
-	 */
-	fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
-	verbose("Found matching %s key: %s",
-	    key_type(key), fp);
-	xfree(fp);
-	key_free(key);
-
-	packet_send_debug("RSA authentication accepted.");
-	return (1);
-}
