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/*
Copyright (c) 2011, 2018 MariaDB Corporation
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA */
/*
This file contains code to interact with the PAM module.
To be included into auth_pam_tool.c and auth_pam_v2.c,
Before the #include these sould be defined:
struct param {
unsigned char buf[10240], *ptr;
MYSQL_PLUGIN_VIO *vio;
... other arbitrary fields allowed.
};
static int write_packet(struct param *param, const unsigned char *buf,
int buf_len)
static int read_packet(struct param *param, unsigned char **pkt)
*/
#include <config_auth_pam.h>
#include <stdio.h>
#include <string.h>
#include <security/pam_appl.h>
#include <security/pam_modules.h>
/* It least solaris doesn't have strndup */
#ifndef HAVE_STRNDUP
char *strndup(const char *from, size_t length)
{
char *ptr;
size_t max_length= strlen(from);
if (length > max_length)
length= max_length;
if ((ptr= (char*) malloc(length+1)) != 0)
{
memcpy((char*) ptr, (char*) from, length);
ptr[length]=0;
}
return ptr;
}
#endif
#ifndef DBUG_OFF
static char pam_debug = 0;
#define PAM_DEBUG(X) do { if (pam_debug) { fprintf X; } } while(0)
#else
#define PAM_DEBUG(X) /* no-op */
#endif
static char winbind_hack = 0;
static int conv(int n, const struct pam_message **msg,
struct pam_response **resp, void *data)
{
struct param *param = (struct param *)data;
unsigned char *end = param->buf + sizeof(param->buf) - 1;
int i;
*resp = 0;
for (i = 0; i < n; i++)
{
/* if there's a message - append it to the buffer */
if (msg[i]->msg)
{
int len = strlen(msg[i]->msg);
if (len > end - param->ptr)
len = end - param->ptr;
if (len > 0)
{
memcpy(param->ptr, msg[i]->msg, len);
param->ptr+= len;
*(param->ptr)++ = '\n';
}
}
/* if the message style is *_PROMPT_*, meaning PAM asks a question,
send the accumulated text to the client, read the reply */
if (msg[i]->msg_style == PAM_PROMPT_ECHO_OFF ||
msg[i]->msg_style == PAM_PROMPT_ECHO_ON)
{
int pkt_len;
unsigned char *pkt;
/* allocate the response array.
freeing it is the responsibility of the caller */
if (*resp == 0)
{
*resp = calloc(sizeof(struct pam_response), n);
if (*resp == 0)
return PAM_BUF_ERR;
}
/* dialog plugin interprets the first byte of the packet
as the magic number.
2 means "read the input with the echo enabled"
4 means "password-like input, echo disabled"
C'est la vie. */
param->buf[0] = msg[i]->msg_style == PAM_PROMPT_ECHO_ON ? 2 : 4;
PAM_DEBUG((stderr, "PAM: conv: send(%.*s)\n",
(int)(param->ptr - param->buf - 1), param->buf));
pkt_len= roundtrip(param, param->buf, param->ptr - param->buf - 1, &pkt);
if (pkt_len < 0)
return PAM_CONV_ERR;
PAM_DEBUG((stderr, "PAM: conv: recv(%.*s)\n", pkt_len, pkt));
/* allocate and copy the reply to the response array */
if (!((*resp)[i].resp= strndup((char*) pkt, pkt_len)))
return PAM_CONV_ERR;
param->ptr = param->buf + 1;
}
}
return PAM_SUCCESS;
}
#define DO(X) if ((status = (X)) != PAM_SUCCESS) goto end
#if defined(SOLARIS) || defined(__sun)
typedef void** pam_get_item_3_arg;
#else
typedef const void** pam_get_item_3_arg;
#endif
static int pam_auth_base(struct param *param, MYSQL_SERVER_AUTH_INFO *info)
{
pam_handle_t *pamh = NULL;
int status;
const char *new_username= NULL;
/* The following is written in such a way to make also solaris happy */
struct pam_conv pam_start_arg = { &conv, (char*) param };
/*
get the service name, as specified in
CREATE USER ... IDENTIFIED WITH pam AS "service"
*/
const char *service = info->auth_string && info->auth_string[0]
? info->auth_string : "mysql";
param->ptr = param->buf + 1;
PAM_DEBUG((stderr, "PAM: pam_start(%s, %s)\n", service, info->user_name));
DO( pam_start(service, info->user_name, &pam_start_arg, &pamh) );
PAM_DEBUG((stderr, "PAM: pam_authenticate(0)\n"));
DO( pam_authenticate (pamh, 0) );
PAM_DEBUG((stderr, "PAM: pam_acct_mgmt(0)\n"));
DO( pam_acct_mgmt(pamh, 0) );
PAM_DEBUG((stderr, "PAM: pam_get_item(PAM_USER)\n"));
DO( pam_get_item(pamh, PAM_USER, (pam_get_item_3_arg) &new_username) );
if (new_username &&
(winbind_hack ? strcasecmp : strcmp)(new_username, info->user_name))
strncpy(info->authenticated_as, new_username,
sizeof(info->authenticated_as));
info->authenticated_as[sizeof(info->authenticated_as)-1]= 0;
end:
PAM_DEBUG((stderr, "PAM: status = %d (%s) user = %s\n",
status, pam_strerror(pamh, status), info->authenticated_as));
pam_end(pamh, status);
return status == PAM_SUCCESS ? CR_OK : CR_ERROR;
}
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