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/* author_r.c - Reads authorization reply from the server.
*
* Copyright (C) 2010, Pawel Krawczyk <pawel.krawczyk@hush.com> and
* Jeroen Nijhof <jeroen@jeroennijhof.nl>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 - see the file COPYING.
*
* See `CHANGES' file for revision history.
*/
#include "xalloc.h"
#include "libtac.h"
#include "messages.h"
/* This function returns structure containing
1. status (granted/denied)
2. message for the user
3. list of attributes returned by server
The attributes should be applied to service authorization
is requested for.
*
* return value:
* < 0 : error status code, see LIBTAC_STATUS_...
* LIBTAC_STATUS_READ_TIMEOUT
* LIBTAC_STATUS_SHORT_HDR
* LIBTAC_STATUS_SHORT_BODY
* LIBTAC_STATUS_PROTOCOL_ERR
* >= 0 : server response, see TAC_PLUS_AUTHOR_STATUS_...
*/
int tac_author_read(int fd, struct areply *re) {
HDR th;
struct author_reply *tb = NULL;
int len_from_header, r, len_from_body;
u_char *pktp = NULL;
char *msg = NULL;
int timeleft;
re->msg = NULL;
bzero(re, sizeof(struct areply));
if (tac_readtimeout_enable &&
tac_read_wait(fd,tac_timeout*1000,TAC_PLUS_HDR_SIZE,&timeleft) < 0 ) {
TACSYSLOG((LOG_ERR,\
"%s: reply timeout after %d secs", __FUNCTION__, tac_timeout))
re->msg = xstrdup(author_syserr_msg);
re->status = LIBTAC_STATUS_READ_TIMEOUT;
free(tb);
return re->status;
}
r = read(fd, &th, TAC_PLUS_HDR_SIZE);
if(r < TAC_PLUS_HDR_SIZE) {
TACSYSLOG((LOG_ERR,\
"%s: short reply header, read %d of %d: %m", __FUNCTION__,\
r, TAC_PLUS_HDR_SIZE))
re->msg = xstrdup(author_syserr_msg);
re->status = LIBTAC_STATUS_SHORT_HDR;
free(tb);
return re->status;
}
/* check header consistency */
msg = _tac_check_header(&th, TAC_PLUS_AUTHOR);
if (msg != NULL) {
/* no need to process body if header is broken */
re->msg = xstrdup(msg);
re->status = LIBTAC_STATUS_PROTOCOL_ERR;
free(tb);
return re->status;
}
len_from_header = ntohl(th.datalength);
tb = (struct author_reply *) xcalloc(1, len_from_header);
/* read reply packet body */
if (tac_readtimeout_enable &&
tac_read_wait(fd,timeleft,len_from_header,NULL) < 0 ) {
TACSYSLOG((LOG_ERR,\
"%s: reply timeout after %d secs", __FUNCTION__, tac_timeout))
re->msg = xstrdup(author_syserr_msg);
re->status = LIBTAC_STATUS_READ_TIMEOUT;
free(tb);
return re->status;
}
r = read(fd, tb, len_from_header);
if (r < len_from_header) {
TACSYSLOG((LOG_ERR,\
"%s: short reply body, read %d of %d: %m", __FUNCTION__,\
r, len_from_header))
re->msg = xstrdup(author_syserr_msg);
re->status = LIBTAC_STATUS_SHORT_BODY;
free(tb);
return re->status;
}
/* decrypt the body */
_tac_crypt((u_char *) tb, &th, len_from_header);
/* Convert network byte order to host byte order */
tb->msg_len = ntohs(tb->msg_len);
tb->data_len = ntohs(tb->data_len);
/* check consistency of the reply body
* len_from_header = declared in header
* len_from_body = value computed from body fields
*/
len_from_body = TAC_AUTHOR_REPLY_FIXED_FIELDS_SIZE +
tb->msg_len + tb->data_len;
pktp = (u_char *) tb + TAC_AUTHOR_REPLY_FIXED_FIELDS_SIZE;
for (r = 0; r < tb->arg_cnt; r++) {
len_from_body += sizeof(u_char); /* add arg length field's size*/
len_from_body += *pktp; /* add arg length itself */
pktp++;
}
if(len_from_header != len_from_body) {
TACSYSLOG((LOG_ERR,\
"%s: inconsistent reply body, incorrect key?",\
__FUNCTION__))
re->msg = xstrdup(protocol_err_msg);
re->status = LIBTAC_STATUS_PROTOCOL_ERR;
free(tb);
return re->status;
}
/* packet seems to be consistent, prepare return messages */
/* server message for user */
if(tb->msg_len) {
char *msg = (char *) xcalloc(1, tb->msg_len+1);
bcopy((u_char *) tb+TAC_AUTHOR_REPLY_FIXED_FIELDS_SIZE
+ (tb->arg_cnt)*sizeof(u_char),
msg, tb->msg_len);
msg[(int) tb->msg_len] = '\0';
re->msg = msg; /* freed by caller */
}
/* server message to syslog */
if(tb->data_len) {
char *smsg=(char *) xcalloc(1, tb->data_len+1);
bcopy((u_char *) tb + TAC_AUTHOR_REPLY_FIXED_FIELDS_SIZE
+ (tb->arg_cnt)*sizeof(u_char)
+ tb->msg_len, smsg,
tb->data_len);
smsg[(int) tb->data_len] = '\0';
TACSYSLOG((LOG_ERR, "%s: reply message: %s", __FUNCTION__,smsg))
free(smsg);
}
TACDEBUG((LOG_DEBUG, "%s: authorization reply status=%d",\
__FUNCTION__, tb->status));
/* prepare status */
switch(tb->status) {
/* success conditions */
/* XXX support optional vs mandatory arguments */
case TAC_PLUS_AUTHOR_STATUS_PASS_REPL:
tac_free_attrib(&re->attr);
case TAC_PLUS_AUTHOR_STATUS_PASS_ADD:
{
u_char *argp;
if(!re->msg) re->msg=xstrdup(author_ok_msg);
re->status=tb->status;
/* add attributes received to attribute list returned to
the client */
pktp = (u_char *) tb + TAC_AUTHOR_REPLY_FIXED_FIELDS_SIZE;
argp = pktp + (tb->arg_cnt * sizeof(u_char)) + tb->msg_len +
tb->data_len;
TACSYSLOG((LOG_WARNING, "Args cnt %d", tb->arg_cnt));
/* argp points to current argument string
pktp points to current argument length */
for(r=0; r < tb->arg_cnt; r++) {
char buff[256];
char *sep;
char *value;
char sepchar = '=';
bcopy(argp, buff, (int)*pktp);
buff[(int)*pktp] = '\0';
sep = strchr(buff, '=');
if ( sep == NULL ) {
sep = strchr(buff, '*');
}
if(sep == NULL) {
TACSYSLOG((LOG_WARNING,\
"AUTHOR_STATUS_PASS_ADD/REPL: av pair does not contain a separator: %s",\
buff))
/* now buff points to attribute name, make value ""
treat as "name=" */
value = "";
} else {
sepchar = *sep;
*sep = '\0';
value = ++sep;
/* now buff points to attribute name,
value to the attribute value */
}
TACSYSLOG((LOG_WARNING, "Adding buf/value pair (%s,%s)", buff, value));
tac_add_attrib_pair(&re->attr, buff, sepchar, value);
argp += *pktp;
pktp++;
}
}
free(tb);
return re->status;
break;
}
switch (tb->status) {
/* authorization failure conditions */
/* failing to follow is allowed by RFC, page 23 */
case TAC_PLUS_AUTHOR_STATUS_FOLLOW:
case TAC_PLUS_AUTHOR_STATUS_FAIL:
if(!re->msg) re->msg = xstrdup(author_fail_msg);
re->status=TAC_PLUS_AUTHOR_STATUS_FAIL;
break;
/* error conditions */
case TAC_PLUS_AUTHOR_STATUS_ERROR:
default:
if(!re->msg) re->msg = xstrdup(author_err_msg);
re->status=TAC_PLUS_AUTHOR_STATUS_ERROR;
}
free(tb);
return re->status;
}
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