mirror of
https://github.com/clearml/dropbear
synced 2025-06-26 18:17:32 +00:00
svr-authpam code merged and works. needs tidying a log
--HG-- branch : authpam extra : convert_revision : abeb2807b88fbd8b95d92b760a209a0816cbaea9
This commit is contained in:
Matt Johnston
215
svr-authpam.c
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215
svr-authpam.c
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/*
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* Dropbear - a SSH2 server
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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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/* Validates a user password */
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#include "includes.h"
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#include "session.h"
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#include "buffer.h"
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#include "dbutil.h"
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#include "auth.h"
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#if defined(HAVE_SECURITY_PAM_APPL_H)
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#include <security/pam_appl.h>
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#elif defined (HAVE_PAM_PAM_APPL_H)
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#include <pam/pam_appl.h>
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#endif
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#ifdef DROPBEAR_PAM_AUTH
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struct UserDataS {
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char* user;
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char* passwd;
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};
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/* PAM conversation function */
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int
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pamConvFunc(int num_msg,
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const struct pam_message **msg,
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struct pam_response **respp,
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void *appdata_ptr) {
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int rc = PAM_SUCCESS;
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struct pam_response* resp = NULL;
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struct UserDataS* userDatap = (struct UserDataS*) appdata_ptr;
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/* tbd only handles one msg */
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switch((*msg)->msg_style) {
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case PAM_PROMPT_ECHO_OFF:
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dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_PROMPT_ECHO_OFF: (*msg)->msg=\"%s\"", (*msg)->msg);
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if (strcmp((*msg)->msg, "Password:") == 0) {
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resp = (struct pam_response*) malloc(sizeof(struct pam_response));
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resp->resp = (char*) strdup(userDatap->passwd);
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/* dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_PROMPT_ECHO_ON: userDatap->passwd=\"%s\"", userDatap->passwd); */
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resp->resp_retcode = 0;
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(*respp) = resp;
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}
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else {
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dropbear_log(LOG_WARNING, "pamConvFunc(): PAM_PROMPT_ECHO_OFF: unrecognized prompt, (*msg)->msg=\"%s\"", (*msg)->msg);
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rc = PAM_CONV_ERR;
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}
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break;
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case PAM_PROMPT_ECHO_ON:
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dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_PROMPT_ECHO_ON: (*msg)->msg=\"%s\"", (*msg)->msg);
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if ((strcmp((*msg)->msg, "login: " ) == 0) || (strcmp((*msg)->msg, "Please enter username: " ) == 0)) {
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resp = (struct pam_response*) malloc(sizeof(struct pam_response));
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resp->resp = (char*) strdup(userDatap->user);
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dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_PROMPT_ECHO_ON: userDatap->user=\"%s\"", userDatap->user);
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resp->resp_retcode = 0;
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(*respp) = resp;
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}
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else {
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dropbear_log(LOG_WARNING, "pamConvFunc(): PAM_PROMPT_ECHO_ON: unrecognized prompt, (*msg)->msg=\"%s\"",
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(*msg)->msg);
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rc = PAM_CONV_ERR;
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}
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break;
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case PAM_ERROR_MSG:
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dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_ERROR_MSG: (*msg)->msg=\"%s\"", (*msg)->msg);
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/* printf("error msg: '%s'\n", (*msg)->msg); */
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rc = PAM_CONV_ERR;
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break;
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case PAM_TEXT_INFO:
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dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_TEXT_INFO: (*msg)->msg=\"%s\"", (*msg)->msg);
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/* printf("text info: '%s'\n", (*msg)->msg); */
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rc = PAM_CONV_ERR;
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break;
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case PAM_RADIO_TYPE:
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dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_RADIO_TYPE: (*msg)->msg=\"%s\"", (*msg)->msg);
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/* printf("radio type: '%s'\n", (*msg)->msg); */
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rc = PAM_CONV_ERR;
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break;
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case PAM_BINARY_PROMPT:
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dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_BINARY_PROMPT: (*msg)->msg=\"%s\"", (*msg)->msg);
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/* printf("binary prompt: '%s'\n", (*msg)->msg); */
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rc = PAM_CONV_ERR;
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break;
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default:
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dropbear_log(LOG_DEBUG, "pamConvFunc(): Unknown PAM message");
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/* printf("unknown message\n"); */
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rc = PAM_CONV_ERR;
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break;
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}
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return rc;
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}
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/* Process a password auth request, sending success or failure messages as
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* appropriate */
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void svr_auth_pam() {
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// PAM stuff
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int rc = PAM_SUCCESS;
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struct UserDataS userData;
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struct pam_conv pamConv = {
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pamConvFunc,
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&userData /* submitted to pamvConvFunc as appdata_ptr */
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};
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pam_handle_t* pamHandlep = NULL;
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unsigned char * password = NULL;
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unsigned int passwordlen;
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unsigned char changepw;
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/* check if client wants to change password */
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changepw = buf_getbyte(ses.payload);
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if (changepw) {
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/* not implemented by this server */
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send_msg_userauth_failure(0, 1);
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return;
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}
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password = buf_getstring(ses.payload, &passwordlen);
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/* clear the buffer containing the password */
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buf_incrpos(ses.payload, -passwordlen - 4);
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m_burn(buf_getptr(ses.payload, passwordlen + 4), passwordlen + 4);
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/* used to pass data to the PAM conversation function */
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userData.user = ses.authstate.printableuser;
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TRACE(("user is %s\n", userData.user));
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userData.passwd = password;
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/* Init pam */
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if ((rc = pam_start("sshd", NULL, &pamConv, &pamHandlep)) != PAM_SUCCESS) {
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dropbear_log(LOG_WARNING, "pam_start() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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/* fprintf(stderr, "pam_start() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc)); */
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goto clean;
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}
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/*
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if ((rc = pam_set_item(pamHandlep, PAM_RHOST, webReqp->ipaddr) != PAM_SUCCESS)) {
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dropbear_log(LOG_WARNING, "pam_set_item() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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return;
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}
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*/
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/* just to set it to something */
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if ((rc = pam_set_item(pamHandlep, PAM_TTY, "ssh") != PAM_SUCCESS)) {
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dropbear_log(LOG_WARNING, "pam_set_item() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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goto clean;
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}
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(void) pam_fail_delay(pamHandlep, 0 /* musec_delay */);
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/* (void) pam_set_item(pamHandlep, PAM_FAIL_DELAY, (void*) pamDelayFunc); */
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if ((rc = pam_authenticate(pamHandlep, 0)) != PAM_SUCCESS) {
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dropbear_log(LOG_WARNING, "pam_authenticate() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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/* fprintf(stderr, "pam_authenticate() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc)); */
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dropbear_log(LOG_WARNING,
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"bad pam password attempt for '%s'",
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ses.authstate.printableuser);
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send_msg_userauth_failure(0, 1);
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goto clean;
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}
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if ((rc = pam_acct_mgmt(pamHandlep, 0)) != PAM_SUCCESS) {
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dropbear_log(LOG_WARNING, "pam_acct_mgmt() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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/* fprintf(stderr, "pam_acct_mgmt() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc)); */
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dropbear_log(LOG_WARNING,
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"bad pam password attempt for '%s'",
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ses.authstate.printableuser);
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send_msg_userauth_failure(0, 1);
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goto clean;
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}
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/* successful authentication */
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dropbear_log(LOG_NOTICE,
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"password auth succeeded for '%s'",
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ses.authstate.printableuser);
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send_msg_userauth_success();
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clean:
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if (password != NULL) {
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m_burn(password, passwordlen);
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m_free(password);
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}
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if (pamHandlep != NULL) {
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(void) pam_end(pamHandlep, 0 /* pam_status */);
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}
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}
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#endif /* DROPBEAR_PAM_AUTH */
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