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/* author_s.c - Send authorization request to 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 "libtac.h"
#include "xalloc.h"
/* Send authorization request to the server, along with attributes
specified in attribute list prepared with tac_add_attrib.
*
* return value:
* 0 : success
* < 0 : error status code, see LIBTAC_STATUS_...
* LIBTAC_STATUS_WRITE_ERR
* LIBTAC_STATUS_WRITE_TIMEOUT (pending impl)
* LIBTAC_STATUS_ASSEMBLY_ERR (pending impl)
*/
int tac_author_send(int fd, const char *user, char *tty, char *r_addr,
struct tac_attrib *attr) {
HDR *th;
struct author tb;
u_char user_len, port_len, r_addr_len;
struct tac_attrib *a;
int i = 0; /* attributes count */
int pkt_len = 0; /* current packet length */
int pktl = 0; /* temporary storage for previous pkt_len values */
int w; /* write() return value */
u_char *pkt = NULL; /* packet building pointer */
/* u_char *pktp; */ /* obsolete */
int ret = 0;
th=_tac_req_header(TAC_PLUS_AUTHOR, 0);
/* set header options */
th->version=TAC_PLUS_VER_0;
th->encryption=tac_encryption ? TAC_PLUS_ENCRYPTED_FLAG : TAC_PLUS_UNENCRYPTED_FLAG;
TACDEBUG((LOG_DEBUG, "%s: user '%s', tty '%s', rem_addr '%s', encrypt: %s", \
__FUNCTION__, user, \
tty, r_addr, tac_encryption ? "yes" : "no"))
user_len = (u_char) strlen(user);
port_len = (u_char) strlen(tty);
r_addr_len = (u_char) strlen(r_addr);
tb.authen_method = tac_authen_method;
tb.priv_lvl = tac_priv_lvl;
if (tac_login == NULL) {
/* default to PAP */
tb.authen_type = TAC_PLUS_AUTHEN_TYPE_PAP;
} else {
if (strcmp(tac_login,"chap") == 0) {
tb.authen_type = TAC_PLUS_AUTHEN_TYPE_CHAP;
} else if (strcmp(tac_login,"login") == 0) {
tb.authen_type = TAC_PLUS_AUTHEN_TYPE_ASCII;
} else {
tb.authen_type = TAC_PLUS_AUTHEN_TYPE_PAP;
}
}
tb.service = tac_authen_service;
tb.user_len = user_len;
tb.port_len = port_len;
tb.r_addr_len = r_addr_len;
/* allocate packet */
pkt = (u_char *) xcalloc(1, TAC_AUTHOR_REQ_FIXED_FIELDS_SIZE);
pkt_len = sizeof(tb);
/* fill attribute length fields */
a = attr;
while (a) {
pktl = pkt_len;
pkt_len += sizeof(a->attr_len);
pkt = (u_char*) xrealloc(pkt, pkt_len);
/* bad method: realloc() is allowed to return different pointer
with each call
pktp=pkt + pkt_len;
pkt_len += sizeof(a->attr_len);
pkt = xrealloc(pkt, pkt_len);
*/
bcopy(&a->attr_len, pkt + pktl, sizeof(a->attr_len));
i++;
a = a->next;
}
/* fill the arg count field and add the fixed fields to packet */
tb.arg_cnt = i;
bcopy(&tb, pkt, TAC_AUTHOR_REQ_FIXED_FIELDS_SIZE);
/*
#define PUTATTR(data, len) \
pktp = pkt + pkt_len; \
pkt_len += len; \
pkt = xrealloc(pkt, pkt_len); \
bcopy(data, pktp, len);
*/
#define PUTATTR(data, len) \
pktl = pkt_len; \
pkt_len += len; \
pkt = (u_char*) xrealloc(pkt, pkt_len); \
bcopy(data, pkt + pktl, len);
/* fill user and port fields */
PUTATTR(user, user_len)
PUTATTR(tty, port_len)
PUTATTR(r_addr, r_addr_len)
/* fill attributes */
a = attr;
while (a) {
PUTATTR(a->attr, a->attr_len)
a = a->next;
}
/* finished building packet, fill len_from_header in header */
th->datalength = htonl(pkt_len);
/* write header */
w = write(fd, th, TAC_PLUS_HDR_SIZE);
if (w < TAC_PLUS_HDR_SIZE) {
TACSYSLOG((LOG_ERR,\
"%s: short write on header, wrote %d of %d: %m",\
__FUNCTION__, w, TAC_PLUS_HDR_SIZE))
free(pkt);
free(th);
return LIBTAC_STATUS_WRITE_ERR;
}
/* encrypt packet body */
_tac_crypt(pkt, th, pkt_len);
/* write body */
w = write(fd, pkt, pkt_len);
if (w < pkt_len) {
TACSYSLOG((LOG_ERR,\
"%s: short write on body, wrote %d of %d: %m",\
__FUNCTION__, w, pkt_len))
ret = LIBTAC_STATUS_WRITE_ERR;
}
free(pkt);
free(th);
TACDEBUG((LOG_DEBUG, "%s: exit status=%d", __FUNCTION__, ret))
return ret;
}
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