+++ /dev/null
-/* $OpenBSD: sshconnect1.c,v 1.80 2017/03/10 03:53:11 dtucker Exp $ */
-/*
- * Author: Tatu Ylonen <ylo@cs.hut.fi>
- * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- * All rights reserved
- * Code to connect to a remote host, and to perform the client side of the
- * login (authentication) dialog.
- *
- * 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 <sys/types.h>
-#include <sys/socket.h>
-
-#include <openssl/bn.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <signal.h>
-#include <pwd.h>
-
-#include "xmalloc.h"
-#include "ssh.h"
-#include "ssh1.h"
-#include "rsa.h"
-#include "buffer.h"
-#include "packet.h"
-#include "key.h"
-#include "cipher.h"
-#include "kex.h"
-#include "uidswap.h"
-#include "log.h"
-#include "misc.h"
-#include "readconf.h"
-#include "authfd.h"
-#include "sshconnect.h"
-#include "authfile.h"
-#include "canohost.h"
-#include "hostfile.h"
-#include "auth.h"
-#include "digest.h"
-#include "ssherr.h"
-
-/* Session id for the current session. */
-u_char session_id[16];
-u_int supported_authentications = 0;
-
-extern Options options;
-extern char *__progname;
-
-/*
- * Checks if the user has an authentication agent, and if so, tries to
- * authenticate using the agent.
- */
-static int
-try_agent_authentication(void)
-{
- int r, type, agent_fd, ret = 0;
- u_char response[16];
- size_t i;
- BIGNUM *challenge;
- struct ssh_identitylist *idlist = NULL;
-
- /* Get connection to the agent. */
- if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
- if (r != SSH_ERR_AGENT_NOT_PRESENT)
- debug("%s: ssh_get_authentication_socket: %s",
- __func__, ssh_err(r));
- return 0;
- }
-
- if ((challenge = BN_new()) == NULL)
- fatal("try_agent_authentication: BN_new failed");
-
- /* Loop through identities served by the agent. */
- if ((r = ssh_fetch_identitylist(agent_fd, 1, &idlist)) != 0) {
- if (r != SSH_ERR_AGENT_NO_IDENTITIES)
- debug("%s: ssh_fetch_identitylist: %s",
- __func__, ssh_err(r));
- goto out;
- }
- for (i = 0; i < idlist->nkeys; i++) {
- /* Try this identity. */
- debug("Trying RSA authentication via agent with '%.100s'",
- idlist->comments[i]);
-
- /* Tell the server that we are willing to authenticate using this key. */
- packet_start(SSH_CMSG_AUTH_RSA);
- packet_put_bignum(idlist->keys[i]->rsa->n);
- packet_send();
- packet_write_wait();
-
- /* Wait for server's response. */
- type = packet_read();
-
- /* The server sends failure if it doesn't like our key or
- does not support RSA authentication. */
- if (type == SSH_SMSG_FAILURE) {
- debug("Server refused our key.");
- continue;
- }
- /* Otherwise it should have sent a challenge. */
- if (type != SSH_SMSG_AUTH_RSA_CHALLENGE)
- packet_disconnect("Protocol error during RSA authentication: %d",
- type);
-
- packet_get_bignum(challenge);
- packet_check_eom();
-
- debug("Received RSA challenge from server.");
-
- /* Ask the agent to decrypt the challenge. */
- if ((r = ssh_decrypt_challenge(agent_fd, idlist->keys[i],
- challenge, session_id, response)) != 0) {
- /*
- * The agent failed to authenticate this identifier
- * although it advertised it supports this. Just
- * return a wrong value.
- */
- logit("Authentication agent failed to decrypt "
- "challenge: %s", ssh_err(r));
- explicit_bzero(response, sizeof(response));
- }
- debug("Sending response to RSA challenge.");
-
- /* Send the decrypted challenge back to the server. */
- packet_start(SSH_CMSG_AUTH_RSA_RESPONSE);
- for (i = 0; i < 16; i++)
- packet_put_char(response[i]);
- packet_send();
- packet_write_wait();
-
- /* Wait for response from the server. */
- type = packet_read();
-
- /*
- * The server returns success if it accepted the
- * authentication.
- */
- if (type == SSH_SMSG_SUCCESS) {
- debug("RSA authentication accepted by server.");
- ret = 1;
- break;
- } else if (type != SSH_SMSG_FAILURE)
- packet_disconnect("Protocol error waiting RSA auth "
- "response: %d", type);
- }
- if (ret != 1)
- debug("RSA authentication using agent refused.");
- out:
- ssh_free_identitylist(idlist);
- ssh_close_authentication_socket(agent_fd);
- BN_clear_free(challenge);
- return ret;
-}
-
-/*
- * Computes the proper response to a RSA challenge, and sends the response to
- * the server.
- */
-static void
-respond_to_rsa_challenge(BIGNUM * challenge, RSA * prv)
-{
- u_char buf[32], response[16];
- struct ssh_digest_ctx *md;
- int i, len;
-
- /* Decrypt the challenge using the private key. */
- /* XXX think about Bleichenbacher, too */
- if (rsa_private_decrypt(challenge, challenge, prv) != 0)
- packet_disconnect(
- "respond_to_rsa_challenge: rsa_private_decrypt failed");
-
- /* Compute the response. */
- /* The response is MD5 of decrypted challenge plus session id. */
- len = BN_num_bytes(challenge);
- if (len <= 0 || (u_int)len > sizeof(buf))
- packet_disconnect(
- "respond_to_rsa_challenge: bad challenge length %d", len);
-
- memset(buf, 0, sizeof(buf));
- BN_bn2bin(challenge, buf + sizeof(buf) - len);
- if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
- ssh_digest_update(md, buf, 32) < 0 ||
- ssh_digest_update(md, session_id, 16) < 0 ||
- ssh_digest_final(md, response, sizeof(response)) < 0)
- fatal("%s: md5 failed", __func__);
- ssh_digest_free(md);
-
- debug("Sending response to host key RSA challenge.");
-
- /* Send the response back to the server. */
- packet_start(SSH_CMSG_AUTH_RSA_RESPONSE);
- for (i = 0; i < 16; i++)
- packet_put_char(response[i]);
- packet_send();
- packet_write_wait();
-
- explicit_bzero(buf, sizeof(buf));
- explicit_bzero(response, sizeof(response));
- explicit_bzero(&md, sizeof(md));
-}
-
-/*
- * Checks if the user has authentication file, and if so, tries to authenticate
- * the user using it.
- */
-static int
-try_rsa_authentication(int idx)
-{
- BIGNUM *challenge;
- Key *public, *private;
- char buf[300], *passphrase = NULL, *comment, *authfile;
- int i, perm_ok = 1, type, quit;
-
- public = options.identity_keys[idx];
- authfile = options.identity_files[idx];
- comment = xstrdup(authfile);
-
- debug("Trying RSA authentication with key '%.100s'", comment);
-
- /* Tell the server that we are willing to authenticate using this key. */
- packet_start(SSH_CMSG_AUTH_RSA);
- packet_put_bignum(public->rsa->n);
- packet_send();
- packet_write_wait();
-
- /* Wait for server's response. */
- type = packet_read();
-
- /*
- * The server responds with failure if it doesn't like our key or
- * doesn't support RSA authentication.
- */
- if (type == SSH_SMSG_FAILURE) {
- debug("Server refused our key.");
- free(comment);
- return 0;
- }
- /* Otherwise, the server should respond with a challenge. */
- if (type != SSH_SMSG_AUTH_RSA_CHALLENGE)
- packet_disconnect("Protocol error during RSA authentication: %d", type);
-
- /* Get the challenge from the packet. */
- if ((challenge = BN_new()) == NULL)
- fatal("try_rsa_authentication: BN_new failed");
- packet_get_bignum(challenge);
- packet_check_eom();
-
- debug("Received RSA challenge from server.");
-
- /*
- * If the key is not stored in external hardware, we have to
- * load the private key. Try first with empty passphrase; if it
- * fails, ask for a passphrase.
- */
- if (public->flags & SSHKEY_FLAG_EXT)
- private = public;
- else
- private = key_load_private_type(KEY_RSA1, authfile, "", NULL,
- &perm_ok);
- if (private == NULL && !options.batch_mode && perm_ok) {
- snprintf(buf, sizeof(buf),
- "Enter passphrase for RSA key '%.100s': ", comment);
- for (i = 0; i < options.number_of_password_prompts; i++) {
- passphrase = read_passphrase(buf, 0);
- if (strcmp(passphrase, "") != 0) {
- private = key_load_private_type(KEY_RSA1,
- authfile, passphrase, NULL, NULL);
- quit = 0;
- } else {
- debug2("no passphrase given, try next key");
- quit = 1;
- }
- if (private != NULL || quit)
- break;
- debug2("bad passphrase given, try again...");
- }
- }
-
- if (private != NULL)
- maybe_add_key_to_agent(authfile, private, comment, passphrase);
-
- if (passphrase != NULL) {
- explicit_bzero(passphrase, strlen(passphrase));
- free(passphrase);
- }
-
- /* We no longer need the comment. */
- free(comment);
-
- if (private == NULL) {
- if (!options.batch_mode && perm_ok)
- error("Bad passphrase.");
-
- /* Send a dummy response packet to avoid protocol error. */
- packet_start(SSH_CMSG_AUTH_RSA_RESPONSE);
- for (i = 0; i < 16; i++)
- packet_put_char(0);
- packet_send();
- packet_write_wait();
-
- /* Expect the server to reject it... */
- packet_read_expect(SSH_SMSG_FAILURE);
- BN_clear_free(challenge);
- return 0;
- }
-
- /* Compute and send a response to the challenge. */
- respond_to_rsa_challenge(challenge, private->rsa);
-
- /* Destroy the private key unless it in external hardware. */
- if (!(private->flags & SSHKEY_FLAG_EXT))
- key_free(private);
-
- /* We no longer need the challenge. */
- BN_clear_free(challenge);
-
- /* Wait for response from the server. */
- type = packet_read();
- if (type == SSH_SMSG_SUCCESS) {
- debug("RSA authentication accepted by server.");
- return 1;
- }
- if (type != SSH_SMSG_FAILURE)
- packet_disconnect("Protocol error waiting RSA auth response: %d", type);
- debug("RSA authentication refused.");
- return 0;
-}
-
-/*
- * Tries to authenticate the user using combined rhosts or /etc/hosts.equiv
- * authentication and RSA host authentication.
- */
-static int
-try_rhosts_rsa_authentication(const char *local_user, Key * host_key)
-{
- int type;
- BIGNUM *challenge;
-
- debug("Trying rhosts or /etc/hosts.equiv with RSA host authentication.");
-
- /* Tell the server that we are willing to authenticate using this key. */
- packet_start(SSH_CMSG_AUTH_RHOSTS_RSA);
- packet_put_cstring(local_user);
- packet_put_int(BN_num_bits(host_key->rsa->n));
- packet_put_bignum(host_key->rsa->e);
- packet_put_bignum(host_key->rsa->n);
- packet_send();
- packet_write_wait();
-
- /* Wait for server's response. */
- type = packet_read();
-
- /* The server responds with failure if it doesn't admit our
- .rhosts authentication or doesn't know our host key. */
- if (type == SSH_SMSG_FAILURE) {
- debug("Server refused our rhosts authentication or host key.");
- return 0;
- }
- /* Otherwise, the server should respond with a challenge. */
- if (type != SSH_SMSG_AUTH_RSA_CHALLENGE)
- packet_disconnect("Protocol error during RSA authentication: %d", type);
-
- /* Get the challenge from the packet. */
- if ((challenge = BN_new()) == NULL)
- fatal("try_rhosts_rsa_authentication: BN_new failed");
- packet_get_bignum(challenge);
- packet_check_eom();
-
- debug("Received RSA challenge for host key from server.");
-
- /* Compute a response to the challenge. */
- respond_to_rsa_challenge(challenge, host_key->rsa);
-
- /* We no longer need the challenge. */
- BN_clear_free(challenge);
-
- /* Wait for response from the server. */
- type = packet_read();
- if (type == SSH_SMSG_SUCCESS) {
- debug("Rhosts or /etc/hosts.equiv with RSA host authentication accepted by server.");
- return 1;
- }
- if (type != SSH_SMSG_FAILURE)
- packet_disconnect("Protocol error waiting RSA auth response: %d", type);
- debug("Rhosts or /etc/hosts.equiv with RSA host authentication refused.");
- return 0;
-}
-
-/*
- * Tries to authenticate with any string-based challenge/response system.
- * Note that the client code is not tied to s/key or TIS.
- */
-static int
-try_challenge_response_authentication(void)
-{
- int type, i;
- u_int clen;
- char prompt[1024];
- char *challenge, *response;
-
- debug("Doing challenge response authentication.");
-
- for (i = 0; i < options.number_of_password_prompts; i++) {
- /* request a challenge */
- packet_start(SSH_CMSG_AUTH_TIS);
- packet_send();
- packet_write_wait();
-
- type = packet_read();
- if (type != SSH_SMSG_FAILURE &&
- type != SSH_SMSG_AUTH_TIS_CHALLENGE) {
- packet_disconnect("Protocol error: got %d in response "
- "to SSH_CMSG_AUTH_TIS", type);
- }
- if (type != SSH_SMSG_AUTH_TIS_CHALLENGE) {
- debug("No challenge.");
- return 0;
- }
- challenge = packet_get_string(&clen);
- packet_check_eom();
- snprintf(prompt, sizeof prompt, "%s%s", challenge,
- strchr(challenge, '\n') ? "" : "\nResponse: ");
- free(challenge);
- if (i != 0)
- error("Permission denied, please try again.");
- if (options.cipher == SSH_CIPHER_NONE)
- logit("WARNING: Encryption is disabled! "
- "Response will be transmitted in clear text.");
- response = read_passphrase(prompt, 0);
- if (strcmp(response, "") == 0) {
- free(response);
- break;
- }
- packet_start(SSH_CMSG_AUTH_TIS_RESPONSE);
- ssh_put_password(response);
- explicit_bzero(response, strlen(response));
- free(response);
- packet_send();
- packet_write_wait();
- type = packet_read();
- if (type == SSH_SMSG_SUCCESS)
- return 1;
- if (type != SSH_SMSG_FAILURE)
- packet_disconnect("Protocol error: got %d in response "
- "to SSH_CMSG_AUTH_TIS_RESPONSE", type);
- }
- /* failure */
- return 0;
-}
-
-/*
- * Tries to authenticate with plain passwd authentication.
- */
-static int
-try_password_authentication(char *prompt)
-{
- int type, i;
- char *password;
-
- debug("Doing password authentication.");
- if (options.cipher == SSH_CIPHER_NONE)
- logit("WARNING: Encryption is disabled! Password will be transmitted in clear text.");
- for (i = 0; i < options.number_of_password_prompts; i++) {
- if (i != 0)
- error("Permission denied, please try again.");
- password = read_passphrase(prompt, 0);
- packet_start(SSH_CMSG_AUTH_PASSWORD);
- ssh_put_password(password);
- explicit_bzero(password, strlen(password));
- free(password);
- packet_send();
- packet_write_wait();
-
- type = packet_read();
- if (type == SSH_SMSG_SUCCESS)
- return 1;
- if (type != SSH_SMSG_FAILURE)
- packet_disconnect("Protocol error: got %d in response to passwd auth", type);
- }
- /* failure */
- return 0;
-}
-
-/*
- * SSH1 key exchange
- */
-void
-ssh_kex(char *host, struct sockaddr *hostaddr)
-{
- int i;
- BIGNUM *key;
- Key *host_key, *server_key;
- int bits, rbits;
- int ssh_cipher_default = SSH_CIPHER_3DES;
- u_char session_key[SSH_SESSION_KEY_LENGTH];
- u_char cookie[8];
- u_int supported_ciphers;
- u_int server_flags, client_flags;
-
- debug("Waiting for server public key.");
-
- /* Wait for a public key packet from the server. */
- packet_read_expect(SSH_SMSG_PUBLIC_KEY);
-
- /* Get cookie from the packet. */
- for (i = 0; i < 8; i++)
- cookie[i] = packet_get_char();
-
- /* Get the public key. */
- if ((server_key = key_new(KEY_RSA1)) == NULL)
- fatal("%s: key_new(KEY_RSA1) failed", __func__);
- bits = packet_get_int();
- packet_get_bignum(server_key->rsa->e);
- packet_get_bignum(server_key->rsa->n);
-
- rbits = BN_num_bits(server_key->rsa->n);
- if (bits != rbits) {
- logit("Warning: Server lies about size of server public key: "
- "actual size is %d bits vs. announced %d.", rbits, bits);
- logit("Warning: This may be due to an old implementation of ssh.");
- }
- /* Get the host key. */
- if ((host_key = key_new(KEY_RSA1)) == NULL)
- fatal("%s: key_new(KEY_RSA1) failed", __func__);
- bits = packet_get_int();
- packet_get_bignum(host_key->rsa->e);
- packet_get_bignum(host_key->rsa->n);
-
- rbits = BN_num_bits(host_key->rsa->n);
- if (bits != rbits) {
- logit("Warning: Server lies about size of server host key: "
- "actual size is %d bits vs. announced %d.", rbits, bits);
- logit("Warning: This may be due to an old implementation of ssh.");
- }
-
- /* Get protocol flags. */
- server_flags = packet_get_int();
- packet_set_protocol_flags(server_flags);
-
- supported_ciphers = packet_get_int();
- supported_authentications = packet_get_int();
- packet_check_eom();
-
- debug("Received server public key (%d bits) and host key (%d bits).",
- BN_num_bits(server_key->rsa->n), BN_num_bits(host_key->rsa->n));
-
- if (verify_host_key(host, hostaddr, host_key) == -1)
- fatal("Host key verification failed.");
-
- client_flags = SSH_PROTOFLAG_SCREEN_NUMBER | SSH_PROTOFLAG_HOST_IN_FWD_OPEN;
-
- derive_ssh1_session_id(host_key->rsa->n, server_key->rsa->n, cookie, session_id);
-
- /*
- * Generate an encryption key for the session. The key is a 256 bit
- * random number, interpreted as a 32-byte key, with the least
- * significant 8 bits being the first byte of the key.
- */
- arc4random_buf(session_key, sizeof(session_key));
-
- /*
- * According to the protocol spec, the first byte of the session key
- * is the highest byte of the integer. The session key is xored with
- * the first 16 bytes of the session id.
- */
- if ((key = BN_new()) == NULL)
- fatal("ssh_kex: BN_new failed");
- if (BN_set_word(key, 0) == 0)
- fatal("ssh_kex: BN_set_word failed");
- for (i = 0; i < SSH_SESSION_KEY_LENGTH; i++) {
- if (BN_lshift(key, key, 8) == 0)
- fatal("ssh_kex: BN_lshift failed");
- if (i < 16) {
- if (BN_add_word(key, session_key[i] ^ session_id[i])
- == 0)
- fatal("ssh_kex: BN_add_word failed");
- } else {
- if (BN_add_word(key, session_key[i]) == 0)
- fatal("ssh_kex: BN_add_word failed");
- }
- }
-
- /*
- * Encrypt the integer using the public key and host key of the
- * server (key with smaller modulus first).
- */
- if (BN_cmp(server_key->rsa->n, host_key->rsa->n) < 0) {
- /* Public key has smaller modulus. */
- if (BN_num_bits(host_key->rsa->n) <
- BN_num_bits(server_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
- fatal("respond_to_rsa_challenge: host_key %d < server_key %d + "
- "SSH_KEY_BITS_RESERVED %d",
- BN_num_bits(host_key->rsa->n),
- BN_num_bits(server_key->rsa->n),
- SSH_KEY_BITS_RESERVED);
- }
- if (rsa_public_encrypt(key, key, server_key->rsa) != 0 ||
- rsa_public_encrypt(key, key, host_key->rsa) != 0)
- fatal("%s: rsa_public_encrypt failed", __func__);
- } else {
- /* Host key has smaller modulus (or they are equal). */
- if (BN_num_bits(server_key->rsa->n) <
- BN_num_bits(host_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
- fatal("respond_to_rsa_challenge: server_key %d < host_key %d + "
- "SSH_KEY_BITS_RESERVED %d",
- BN_num_bits(server_key->rsa->n),
- BN_num_bits(host_key->rsa->n),
- SSH_KEY_BITS_RESERVED);
- }
- if (rsa_public_encrypt(key, key, host_key->rsa) != 0 ||
- rsa_public_encrypt(key, key, server_key->rsa) != 0)
- fatal("%s: rsa_public_encrypt failed", __func__);
- }
-
- /* Destroy the public keys since we no longer need them. */
- key_free(server_key);
- key_free(host_key);
-
- if (options.cipher == SSH_CIPHER_NOT_SET) {
- if (cipher_mask_ssh1(1) & supported_ciphers & (1 << ssh_cipher_default))
- options.cipher = ssh_cipher_default;
- } else if (options.cipher == SSH_CIPHER_INVALID ||
- !(cipher_mask_ssh1(1) & (1 << options.cipher))) {
- logit("No valid SSH1 cipher, using %.100s instead.",
- cipher_name(ssh_cipher_default));
- options.cipher = ssh_cipher_default;
- }
- /* Check that the selected cipher is supported. */
- if (!(supported_ciphers & (1 << options.cipher)))
- fatal("Selected cipher type %.100s not supported by server.",
- cipher_name(options.cipher));
-
- debug("Encryption type: %.100s", cipher_name(options.cipher));
-
- /* Send the encrypted session key to the server. */
- packet_start(SSH_CMSG_SESSION_KEY);
- packet_put_char(options.cipher);
-
- /* Send the cookie back to the server. */
- for (i = 0; i < 8; i++)
- packet_put_char(cookie[i]);
-
- /* Send and destroy the encrypted encryption key integer. */
- packet_put_bignum(key);
- BN_clear_free(key);
-
- /* Send protocol flags. */
- packet_put_int(client_flags);
-
- /* Send the packet now. */
- packet_send();
- packet_write_wait();
-
- debug("Sent encrypted session key.");
-
- /* Set the encryption key. */
- packet_set_encryption_key(session_key, SSH_SESSION_KEY_LENGTH, options.cipher);
-
- /*
- * We will no longer need the session key here.
- * Destroy any extra copies.
- */
- explicit_bzero(session_key, sizeof(session_key));
-
- /*
- * Expect a success message from the server. Note that this message
- * will be received in encrypted form.
- */
- packet_read_expect(SSH_SMSG_SUCCESS);
-
- debug("Received encrypted confirmation.");
-}
-
-/*
- * Authenticate user
- */
-void
-ssh_userauth1(const char *local_user, const char *server_user, char *host,
- Sensitive *sensitive)
-{
- int i, type;
-
- if (supported_authentications == 0)
- fatal("ssh_userauth1: server supports no auth methods");
-
- /* Send the name of the user to log in as on the server. */
- packet_start(SSH_CMSG_USER);
- packet_put_cstring(server_user);
- packet_send();
- packet_write_wait();
-
- /*
- * The server should respond with success if no authentication is
- * needed (the user has no password). Otherwise the server responds
- * with failure.
- */
- type = packet_read();
-
- /* check whether the connection was accepted without authentication. */
- if (type == SSH_SMSG_SUCCESS)
- goto success;
- if (type != SSH_SMSG_FAILURE)
- packet_disconnect("Protocol error: got %d in response to SSH_CMSG_USER", type);
-
- /*
- * Try .rhosts or /etc/hosts.equiv authentication with RSA host
- * authentication.
- */
- if ((supported_authentications & (1 << SSH_AUTH_RHOSTS_RSA)) &&
- options.rhosts_rsa_authentication) {
- for (i = 0; i < sensitive->nkeys; i++) {
- if (sensitive->keys[i] != NULL &&
- sensitive->keys[i]->type == KEY_RSA1 &&
- try_rhosts_rsa_authentication(local_user,
- sensitive->keys[i]))
- goto success;
- }
- }
- /* Try RSA authentication if the server supports it. */
- if ((supported_authentications & (1 << SSH_AUTH_RSA)) &&
- options.rsa_authentication) {
- /*
- * Try RSA authentication using the authentication agent. The
- * agent is tried first because no passphrase is needed for
- * it, whereas identity files may require passphrases.
- */
- if (try_agent_authentication())
- goto success;
-
- /* Try RSA authentication for each identity. */
- for (i = 0; i < options.num_identity_files; i++)
- if (options.identity_keys[i] != NULL &&
- options.identity_keys[i]->type == KEY_RSA1 &&
- try_rsa_authentication(i))
- goto success;
- }
- /* Try challenge response authentication if the server supports it. */
- if ((supported_authentications & (1 << SSH_AUTH_TIS)) &&
- options.challenge_response_authentication && !options.batch_mode) {
- if (try_challenge_response_authentication())
- goto success;
- }
- /* Try password authentication if the server supports it. */
- if ((supported_authentications & (1 << SSH_AUTH_PASSWORD)) &&
- options.password_authentication && !options.batch_mode) {
- char prompt[80];
-
- snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
- server_user, host);
- if (try_password_authentication(prompt))
- goto success;
- }
- /* All authentication methods have failed. Exit with an error message. */
- fatal("Permission denied.");
- /* NOTREACHED */
-
- success:
- return; /* need statement after label */
-}
projects / openbsd / commitdiff