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/*
* pam.c - Functions to let us call into libpam from Go.
*
* Copyright 2017 Google Inc.
* Author: Joe Richey (joerichey@google.com)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
#include "pam.h"
#include <stdio.h>
#include <stdlib.h>
#include "_cgo_export.h" // for pamInput callback
const char* fscrypt_service = "fscrypt";
static int pam_conv(int num_msg, const struct pam_message** msg,
struct pam_response** resp, void* appdata_ptr) {
if (num_msg <= 0 || num_msg > PAM_MAX_NUM_MSG) {
return PAM_CONV_ERR;
}
// Allocate the response table with num_msg entries.
*resp = calloc(num_msg, sizeof **resp);
if (!*resp) {
return PAM_BUF_ERR;
}
// Check each message to see if we need to run a callback.
char* callback_msg = NULL;
char* callback_resp = NULL;
int i;
for (i = 0; i < num_msg; ++i) {
callback_msg = (char*)msg[i]->msg;
// We run our input callback if the style tells us we need data. Otherwise,
// we just print the error messages or text info to standard output.
switch (msg[i]->msg_style) {
case PAM_PROMPT_ECHO_OFF:
callback_resp = pamInput(callback_msg);
break;
case PAM_PROMPT_ECHO_ON:
// We should never have a request for non-secret data
unexpectedMessage(callback_msg);
callback_resp = NULL;
break;
case PAM_ERROR_MSG:
case PAM_TEXT_INFO:
printf("%s\n", callback_msg);
continue;
}
if (!callback_resp) {
// If the callback failed, free each nonempty response in the response
// table and the response table itself.
while (--i >= 0) {
free((*resp)[i].resp);
}
free(*resp);
return PAM_CONV_ERR;
}
(*resp)[i].resp = callback_resp;
}
return PAM_SUCCESS;
}
void pam_init(struct pam_conv* conv) { conv->conv = pam_conv; }
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