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/*
Copyright (c) 2011, 2012, Monty Program Ab
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#define _GNU_SOURCE 1 /* for strndup */
#include <mysql/plugin_auth.h>
#include <string.h>
#include <security/pam_appl.h>
#include <security/pam_modules.h>
struct param {
unsigned char buf[10240], *ptr;
MYSQL_PLUGIN_VIO *vio;
};
/* 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
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;
if (param->vio->write_packet(param->vio, param->buf, param->ptr - param->buf - 1))
return PAM_CONV_ERR;
pkt_len = param->vio->read_packet(param->vio, &pkt);
if (pkt_len < 0)
return PAM_CONV_ERR;
/* 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(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
{
pam_handle_t *pamh = NULL;
int status;
const char *new_username;
struct param param;
/* The following is written in such a way to make also solaris happy */
struct pam_conv pam_start_arg = { &conv, (char*) ¶m };
/*
get the service name, as specified in
CREATE USER ... IDENTIFIED WITH pam_auth AS "service"
*/
const char *service = info->auth_string && info->auth_string[0]
? info->auth_string : "mysql";
param.ptr = param.buf + 1;
param.vio = vio;
DO( pam_start(service, info->user_name, &pam_start_arg, &pamh) );
DO( pam_authenticate (pamh, 0) );
DO( pam_acct_mgmt(pamh, 0) );
DO( pam_get_item(pamh, PAM_USER, (pam_get_item_3_arg) &new_username) );
if (new_username && strcmp(new_username, info->user_name))
strncpy(info->authenticated_as, new_username,
sizeof(info->authenticated_as));
end:
pam_end(pamh, status);
return status == PAM_SUCCESS ? CR_OK : CR_ERROR;
}
static struct st_mysql_auth info =
{
MYSQL_AUTHENTICATION_INTERFACE_VERSION,
"dialog",
pam_auth
};
static char use_cleartext_plugin;
static MYSQL_SYSVAR_BOOL(use_cleartext_plugin, use_cleartext_plugin,
PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
"Use mysql_cleartext_plugin on the client side instead of the dialog "
"plugin. This may be needed for compatibility reasons, but it only "
"supports simple PAM policies that don't require anything besides "
"a password", NULL, NULL, 0);
static struct st_mysql_sys_var* vars[] = {
MYSQL_SYSVAR(use_cleartext_plugin),
NULL
};
static int init(void *p __attribute__((unused)))
{
if (use_cleartext_plugin)
info.client_auth_plugin= "mysql_clear_password";
return 0;
}
maria_declare_plugin(pam)
{
MYSQL_AUTHENTICATION_PLUGIN,
&info,
"pam",
"Sergei Golubchik",
"PAM based authentication",
PLUGIN_LICENSE_GPL,
init,
NULL,
0x0100,
NULL,
vars,
"1.0",
MariaDB_PLUGIN_MATURITY_STABLE
}
maria_declare_plugin_end;
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