162 lines
3.9 KiB
C
Executable File
162 lines
3.9 KiB
C
Executable File
/*
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* Dropbear SSH
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*
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* Copyright (c) 2002,2003 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_PASSWORD_AUTH
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#ifdef ENABLE_CLI_ASKPASS_HELPER
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/* Returns 1 if we want to use the askpass program, 0 otherwise */
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static int want_askpass()
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{
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char* askpass_prog = NULL;
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askpass_prog = getenv("SSH_ASKPASS");
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return askpass_prog &&
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((!isatty(STDIN_FILENO) && getenv("DISPLAY") )
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|| getenv("SSH_ASKPASS_ALWAYS"));
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}
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/* returns a statically allocated password from a helper app, or NULL
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* on failure */
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static char *gui_getpass(const char *prompt) {
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pid_t pid;
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int p[2], maxlen, len, status;
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static char buf[DROPBEAR_MAX_CLI_PASS + 1];
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char* helper = NULL;
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TRACE(("enter gui_getpass"))
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helper = getenv("SSH_ASKPASS");
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if (!helper)
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{
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TRACE(("leave gui_getpass: no askpass program"))
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return NULL;
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}
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if (pipe(p) < 0) {
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TRACE(("error creating child pipe"))
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return NULL;
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}
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pid = fork();
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if (pid < 0) {
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TRACE(("fork error"))
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return NULL;
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}
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if (!pid) {
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/* child */
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close(p[0]);
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if (dup2(p[1], STDOUT_FILENO) < 0) {
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TRACE(("error redirecting stdout"))
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exit(1);
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}
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close(p[1]);
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execlp(helper, helper, prompt, (char *)0);
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TRACE(("execlp error"))
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exit(1);
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}
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close(p[1]);
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maxlen = sizeof(buf);
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while (maxlen > 0) {
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len = read(p[0], buf + sizeof(buf) - maxlen, maxlen);
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if (len > 0) {
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maxlen -= len;
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} else {
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if (errno != EINTR)
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break;
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}
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}
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close(p[0]);
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while (waitpid(pid, &status, 0) < 0 && errno == EINTR)
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;
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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return(NULL);
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len = sizeof(buf) - maxlen;
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buf[len] = '\0';
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if (len > 0 && buf[len - 1] == '\n')
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buf[len - 1] = '\0';
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TRACE(("leave gui_getpass"))
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return(buf);
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}
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#endif /* ENABLE_CLI_ASKPASS_HELPER */
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void cli_auth_password() {
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char* password = NULL;
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char prompt[80];
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TRACE(("enter cli_auth_password"))
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CHECKCLEARTOWRITE();
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snprintf(prompt, sizeof(prompt), "%s@%s's password: ",
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cli_opts.username, cli_opts.remotehost);
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#ifdef ENABLE_CLI_ASKPASS_HELPER
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if (want_askpass())
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{
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password = gui_getpass(prompt);
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if (!password) {
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dropbear_exit("No password");
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}
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} else
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#endif
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{
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password = getpass_or_cancel(prompt);
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}
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buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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buf_putstring(ses.writepayload, cli_opts.username,
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strlen(cli_opts.username));
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buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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SSH_SERVICE_CONNECTION_LEN);
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buf_putstring(ses.writepayload, AUTH_METHOD_PASSWORD,
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AUTH_METHOD_PASSWORD_LEN);
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buf_putbyte(ses.writepayload, 0); /* FALSE - so says the spec */
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buf_putstring(ses.writepayload, password, strlen(password));
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encrypt_packet();
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m_burn(password, strlen(password));
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TRACE(("leave cli_auth_password"))
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}
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#endif /* ENABLE_CLI_PASSWORD_AUTH */
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