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http://galexander.org/git/simplesshd.git
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176 lines
4.5 KiB
C
176 lines
4.5 KiB
C
/*
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* Dropbear SSH
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*
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* Copyright (c) 2005 Matt Johnston
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE. */
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#include "includes.h"
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#include "buffer.h"
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#include "dbutil.h"
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#include "session.h"
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#include "ssh.h"
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#include "runopts.h"
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#ifdef ENABLE_CLI_INTERACT_AUTH
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static unsigned char* get_response(unsigned char* prompt)
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{
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FILE* tty = NULL;
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unsigned char* response = NULL;
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/* not a password, but a reasonable limit */
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char buf[DROPBEAR_MAX_CLI_PASS];
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char* ret = NULL;
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fprintf(stderr, "%s", prompt);
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tty = fopen(_PATH_TTY, "r");
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if (tty) {
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ret = fgets(buf, sizeof(buf), tty);
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fclose(tty);
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} else {
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ret = fgets(buf, sizeof(buf), stdin);
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}
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if (ret == NULL) {
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response = (unsigned char*)m_strdup("");
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} else {
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unsigned int buflen = strlen(buf);
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/* fgets includes newlines */
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if (buflen > 0 && buf[buflen-1] == '\n')
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buf[buflen-1] = '\0';
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response = (unsigned char*)m_strdup(buf);
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}
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m_burn(buf, sizeof(buf));
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return response;
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}
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void recv_msg_userauth_info_request() {
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unsigned char *name = NULL;
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unsigned char *instruction = NULL;
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unsigned int num_prompts = 0;
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unsigned int i;
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unsigned char *prompt = NULL;
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unsigned int echo = 0;
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unsigned char *response = NULL;
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TRACE(("enter recv_msg_recv_userauth_info_request"))
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/* Let the user know what password/host they are authing for */
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if (!cli_ses.interact_request_received) {
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fprintf(stderr, "Login for %s@%s\n", cli_opts.username,
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cli_opts.remotehost);
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}
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cli_ses.interact_request_received = 1;
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name = buf_getstring(ses.payload, NULL);
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instruction = buf_getstring(ses.payload, NULL);
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/* language tag */
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buf_eatstring(ses.payload);
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num_prompts = buf_getint(ses.payload);
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if (num_prompts >= DROPBEAR_MAX_CLI_INTERACT_PROMPTS) {
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dropbear_exit("Too many prompts received for keyboard-interactive");
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}
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/* we'll build the response as we go */
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CHECKCLEARTOWRITE();
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buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_INFO_RESPONSE);
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buf_putint(ses.writepayload, num_prompts);
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if (strlen(name) > 0) {
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cleantext(name);
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fprintf(stderr, "%s", name);
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}
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m_free(name);
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if (strlen(instruction) > 0) {
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cleantext(instruction);
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fprintf(stderr, "%s", instruction);
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}
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m_free(instruction);
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for (i = 0; i < num_prompts; i++) {
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unsigned int response_len = 0;
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prompt = buf_getstring(ses.payload, NULL);
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cleantext(prompt);
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echo = buf_getbool(ses.payload);
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if (!echo) {
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unsigned char* p = getpass_or_cancel(prompt);
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response = m_strdup(p);
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m_burn(p, strlen(p));
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} else {
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response = get_response(prompt);
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}
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response_len = strlen(response);
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buf_putstring(ses.writepayload, response, response_len);
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m_burn(response, response_len);
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m_free(prompt);
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m_free(response);
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}
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encrypt_packet();
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TRACE(("leave recv_msg_recv_userauth_info_request"))
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}
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void cli_auth_interactive() {
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TRACE(("enter cli_auth_interactive"))
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CHECKCLEARTOWRITE();
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buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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/* username */
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buf_putstring(ses.writepayload, cli_opts.username,
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strlen(cli_opts.username));
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/* service name */
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buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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SSH_SERVICE_CONNECTION_LEN);
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/* method */
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buf_putstring(ses.writepayload, AUTH_METHOD_INTERACT,
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AUTH_METHOD_INTERACT_LEN);
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/* empty language tag */
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buf_putstring(ses.writepayload, "", 0);
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/* empty submethods */
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buf_putstring(ses.writepayload, "", 0);
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encrypt_packet();
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cli_ses.interact_request_received = 0;
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TRACE(("leave cli_auth_interactive"))
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}
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#endif /* ENABLE_CLI_INTERACT_AUTH */
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