int vmps_process(REQUEST *request)
{
DEBUG2("Doing VMPS");
module_post_auth(0, request);
DEBUG2("Done VMPS");
request->reply->code = PW_AUTHENTICATION_ACK;
return 0;
}
/*
* Post-authentication step processes the response before it is
* sent to the NAS. It can receive both Access-Accept and Access-Reject
* replies.
*/
int rad_postauth(REQUEST *request)
{
int result;
int postauth_type = 0;
VALUE_PAIR *vp;
/*
* Do post-authentication calls. ignoring the return code.
*/
vp = pairfind(request->config_items, PW_POST_AUTH_TYPE);
if (vp) {
RDEBUG2("Using Post-Auth-Type %s",
dict_valnamebyattr(PW_POST_AUTH_TYPE, vp->vp_integer));
postauth_type = vp->vp_integer;
}
result = module_post_auth(postauth_type, request);
switch (result) {
/*
* The module failed, or said to reject the user: Do so.
*/
case RLM_MODULE_FAIL:
case RLM_MODULE_INVALID:
case RLM_MODULE_REJECT:
case RLM_MODULE_USERLOCK:
default:
request->reply->code = PW_AUTHENTICATION_REJECT;
result = RLM_MODULE_REJECT;
break;
/*
* The module handled the request, cancel the reply.
*/
case RLM_MODULE_HANDLED:
/* FIXME */
break;
/*
* The module had a number of OK return codes.
*/
case RLM_MODULE_NOOP:
case RLM_MODULE_NOTFOUND:
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
result = RLM_MODULE_OK;
break;
}
return result;
}
/*
* Post-authentication step processes the response before it is
* sent to the NAS. It can receive both Access-Accept and Access-Reject
* replies.
*/
int rad_postauth(REQUEST *request)
{
int result;
int postauth_type = 0;
VALUE_PAIR *postauth_type_item = NULL;
/*
* Do post-authentication calls. ignoring the return code.
*/
postauth_type_item = pairfind(request->config_items, PW_POST_AUTH_TYPE);
if (postauth_type_item)
postauth_type = postauth_type_item->lvalue;
result = module_post_auth(postauth_type, request);
switch (result) {
default:
break;
/*
* The module failed, or said to reject the user: Do so.
*/
case RLM_MODULE_FAIL:
case RLM_MODULE_REJECT:
case RLM_MODULE_USERLOCK:
case RLM_MODULE_INVALID:
request->reply->code = PW_AUTHENTICATION_REJECT;
result = RLM_MODULE_REJECT;
break;
/*
* The module had a number of OK return codes.
*/
case RLM_MODULE_NOTFOUND:
case RLM_MODULE_NOOP:
case RLM_MODULE_UPDATED:
case RLM_MODULE_OK:
case RLM_MODULE_HANDLED:
result = RLM_MODULE_OK;
break;
}
return result;
}
static int dhcp_process(REQUEST *request)
{
int rcode;
VALUE_PAIR *vp;
vp = pairfind(request->packet->vps, 53, DHCP_MAGIC_VENDOR); /* DHCP-Message-Type */
if (vp) {
DICT_VALUE *dv = dict_valbyattr(53, DHCP_MAGIC_VENDOR, vp->vp_integer);
DEBUG("Trying sub-section dhcp %s {...}",
dv->name ? dv->name : "<unknown>");
rcode = module_post_auth(vp->vp_integer, request);
} else {
DEBUG("DHCP: Failed to find DHCP-Message-Type in packet!");
rcode = RLM_MODULE_FAIL;
}
/*
* For messages from a client, look for Relay attribute,
* and forward it if necessary.
*/
vp = NULL;
if (request->packet->data[0] == 1) {
vp = pairfind(request->config_items, 270, DHCP_MAGIC_VENDOR);
}
if (vp) {
VALUE_PAIR *giaddr;
/*
* Find the original giaddr.
* FIXME: Maybe look in the original packet?
*
* It's invalid to have giaddr=0 AND a relay option
*/
giaddr = pairfind(request->packet->vps, 266, DHCP_MAGIC_VENDOR);
if (giaddr && (giaddr->vp_ipaddr == htonl(INADDR_ANY))) {
if (pairfind(request->packet->vps, 82, DHCP_MAGIC_VENDOR)) {
RDEBUG("DHCP: Received packet with giaddr = 0 and containing relay option: Discarding packet");
return 1;
}
}
if (request->packet->data[3] > 10) {
RDEBUG("DHCP: Number of hops is greater than 10: not relaying");
return 1;
}
/*
* Forward a reply...
*/
pairfree(&request->reply->vps);
request->reply->vps = paircopy(request->packet->vps);
request->reply->code = request->packet->code;
request->reply->id = request->packet->id;
request->reply->src_ipaddr = request->packet->dst_ipaddr;
request->reply->src_port = request->packet->dst_port;
request->reply->dst_ipaddr.af = AF_INET;
request->reply->dst_ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
/*
* Don't change the destination port. It's the
* server port.
*/
/*
* Hop count goes up.
*/
vp = pairfind(request->reply->vps, 259, DHCP_MAGIC_VENDOR);
if (vp) vp->vp_integer++;
return 1;
}
/*
* Responses from a server. Handle them differently.
*/
if (request->packet->data[0] == 2) {
pairfree(&request->reply->vps);
request->reply->vps = paircopy(request->packet->vps);
request->reply->code = request->packet->code;
request->reply->id = request->packet->id;
/*
* Delete any existing giaddr. If we received a
* message from the server, then we're NOT the
* server. So we must be the destination of the
* giaddr field.
*/
pairdelete(&request->packet->vps, 266, DHCP_MAGIC_VENDOR);
/*
* Search for client IP address.
*/
vp = pairfind(request->packet->vps, 264, DHCP_MAGIC_VENDOR);
if (!vp) {
request->reply->code = 0;
RDEBUG("DHCP: No YIAddr in the reply. Discarding packet");
return 1;
}
/*
* FROM us, TO the client's IP, OUR port + 1.
*/
request->reply->src_ipaddr = request->packet->dst_ipaddr;
request->reply->src_port = request->packet->dst_port;
request->reply->dst_ipaddr.af = AF_INET;
request->reply->dst_ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
request->reply->dst_port = request->packet->dst_port + 1;
/*
* Hop count goes down.
*/
vp = pairfind(request->reply->vps, 259, DHCP_MAGIC_VENDOR);
if (vp && (vp->vp_integer > 0)) vp->vp_integer--;
/*
* FIXME: Keep original somewhere? If the
* broadcast flags are set, use them here?
*/
return 1;
}
vp = pairfind(request->reply->vps, 53, DHCP_MAGIC_VENDOR); /* DHCP-Message-Type */
if (vp) {
request->reply->code = vp->vp_integer;
if ((request->reply->code != 0) &&
(request->reply->code < PW_DHCP_OFFSET)) {
request->reply->code += PW_DHCP_OFFSET;
}
}
else switch (rcode) {
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
if (request->packet->code == PW_DHCP_DISCOVER) {
request->reply->code = PW_DHCP_OFFER;
break;
} else if (request->packet->code == PW_DHCP_REQUEST) {
request->reply->code = PW_DHCP_ACK;
break;
}
request->reply->code = PW_DHCP_NAK;
break;
default:
case RLM_MODULE_REJECT:
case RLM_MODULE_FAIL:
case RLM_MODULE_INVALID:
case RLM_MODULE_NOOP:
case RLM_MODULE_NOTFOUND:
if (request->packet->code == PW_DHCP_DISCOVER) {
request->reply->code = 0; /* ignore the packet */
} else {
request->reply->code = PW_DHCP_NAK;
}
break;
case RLM_MODULE_HANDLED:
break;
}
/*
* Releases don't get replies.
*/
if (request->packet->code == PW_DHCP_RELEASE) {
request->reply->code = 0;
}
return 1;
}
static int dhcp_process(REQUEST *request)
{
int rcode;
VALUE_PAIR *vp;
vp = pairfind(request->packet->vps, 53, DHCP_MAGIC_VENDOR); /* DHCP-Message-Type */
if (vp) {
DICT_VALUE *dv = dict_valbyattr(53, DHCP_MAGIC_VENDOR, vp->vp_integer);
DEBUG("Trying sub-section dhcp %s {...}",
dv->name ? dv->name : "<unknown>");
rcode = module_post_auth(vp->vp_integer, request);
} else {
DEBUG("DHCP: Failed to find DHCP-Message-Type in packet!");
rcode = RLM_MODULE_FAIL;
}
/*
* Look for Relay attribute, and forward it if necessary.
*/
vp = pairfind(request->config_items, 270, DHCP_MAGIC_VENDOR);
if (vp) {
VALUE_PAIR *giaddr;
RADIUS_PACKET relayed;
request->reply->code = 0; /* don't reply to the client */
/*
* Find the original giaddr.
* FIXME: Maybe look in the original packet?
*
* It's invalid to have giaddr=0 AND a relay option
*/
giaddr = pairfind(request->packet->vps, 266, DHCP_MAGIC_VENDOR);
if (giaddr && (giaddr->vp_ipaddr == htonl(INADDR_ANY))) {
if (pairfind(request->packet->vps, 82, DHCP_MAGIC_VENDOR)) {
RDEBUG("DHCP: Received packet with giaddr = 0 and containing relay option: Discarding packet");
return 1;
}
/*
* FIXME: Add cache by XID.
*/
RDEBUG("DHCP: Cannot yet relay packets with giaddr = 0");
return 1;
}
if (request->packet->data[3] > 10) {
RDEBUG("DHCP: Number of hops is greater than 10: not relaying");
return 1;
}
/*
* Forward it VERBATIM to the next server, rather
* than to the client.
*/
memcpy(&relayed, request->packet, sizeof(relayed));
relayed.dst_ipaddr.af = AF_INET;
relayed.dst_ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
relayed.dst_port = request->packet->dst_port;
relayed.src_ipaddr = request->packet->dst_ipaddr;
relayed.src_port = request->packet->dst_port;
relayed.data = rad_malloc(relayed.data_len);
memcpy(relayed.data, request->packet->data, request->packet->data_len);
relayed.vps = NULL;
/*
* The only field that changes is the number of hops
*/
relayed.data[3]++; /* number of hops */
/*
* Forward the relayed packet VERBATIM, don't
* respond to the client, and forget completely
* about this request.
*/
fr_dhcp_send(&relayed);
free(relayed.data);
return 1;
}
vp = pairfind(request->reply->vps, 53, DHCP_MAGIC_VENDOR); /* DHCP-Message-Type */
if (vp) {
request->reply->code = vp->vp_integer;
if ((request->reply->code != 0) &&
(request->reply->code < PW_DHCP_OFFSET)) {
request->reply->code += PW_DHCP_OFFSET;
}
}
else switch (rcode) {
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
if (request->packet->code == PW_DHCP_DISCOVER) {
request->reply->code = PW_DHCP_OFFER;
break;
} else if (request->packet->code == PW_DHCP_REQUEST) {
request->reply->code = PW_DHCP_ACK;
break;
}
request->reply->code = PW_DHCP_NAK;
break;
default:
case RLM_MODULE_REJECT:
case RLM_MODULE_FAIL:
case RLM_MODULE_INVALID:
case RLM_MODULE_NOOP:
case RLM_MODULE_NOTFOUND:
if (request->packet->code == PW_DHCP_DISCOVER) {
request->reply->code = 0; /* ignore the packet */
} else {
request->reply->code = PW_DHCP_NAK;
}
break;
case RLM_MODULE_HANDLED:
break;
}
/*
* Releases don't get replies.
*/
if (request->packet->code == PW_DHCP_RELEASE) {
request->reply->code = 0;
}
return 1;
}
static int dhcp_process(REQUEST *request)
{
int rcode;
unsigned int i;
VALUE_PAIR *vp;
dhcp_socket_t *sock;
vp = pairfind(request->packet->vps, DHCP2ATTR(53)); /* DHCP-Message-Type */
if (vp) {
DICT_VALUE *dv = dict_valbyattr(DHCP2ATTR(53), vp->vp_integer);
DEBUG("Trying sub-section dhcp %s {...}",
dv->name ? dv->name : "<unknown>");
rcode = module_post_auth(vp->vp_integer, request);
} else {
DEBUG("DHCP: Failed to find DHCP-Message-Type in packet!");
rcode = RLM_MODULE_FAIL;
}
vp = pairfind(request->reply->vps, DHCP2ATTR(53)); /* DHCP-Message-Type */
if (vp) {
request->reply->code = vp->vp_integer;
if ((request->reply->code != 0) &&
(request->reply->code < PW_DHCP_OFFSET)) {
request->reply->code += PW_DHCP_OFFSET;
}
}
else switch (rcode) {
case RLM_MODULE_OK:
case RLM_MODULE_UPDATED:
if (request->packet->code == PW_DHCP_DISCOVER) {
request->reply->code = PW_DHCP_OFFER;
break;
} else if (request->packet->code == PW_DHCP_REQUEST) {
request->reply->code = PW_DHCP_ACK;
break;
}
request->reply->code = PW_DHCP_NAK;
break;
default:
case RLM_MODULE_REJECT:
case RLM_MODULE_FAIL:
case RLM_MODULE_INVALID:
case RLM_MODULE_NOOP:
case RLM_MODULE_NOTFOUND:
if (request->packet->code == PW_DHCP_DISCOVER) {
request->reply->code = 0; /* ignore the packet */
} else {
request->reply->code = PW_DHCP_NAK;
}
break;
case RLM_MODULE_HANDLED:
request->reply->code = 0; /* ignore the packet */
break;
}
/*
* TODO: Handle 'output' of RLM_MODULE when acting as a
* DHCP relay We may want to not forward packets in
* certain circumstances.
*/
/*
* Handle requests when acting as a DHCP relay
*/
vp = pairfind(request->packet->vps, DHCP2ATTR(256)); /* DHCP-Opcode */
if (!vp) {
RDEBUG("FAILURE: Someone deleted the DHCP-Opcode!");
return 1;
}
/* BOOTREPLY received on port 67 (i.e. from a server) */
if (vp->vp_integer == 2) {
return dhcprelay_process_server_reply(request);
}
/* Packet from client, and we have DHCP-Relay-To-IP-Address */
if (pairfind(request->config_items, DHCP2ATTR(270))) {
return dhcprelay_process_client_request(request);
}
/* else it's a packet from a client, without relaying */
rad_assert(vp->vp_integer == 1); /* BOOTREQUEST */
sock = request->listener->data;
/*
* Handle requests when acting as a DHCP server
*/
/*
* Releases don't get replies.
*/
if (request->packet->code == PW_DHCP_RELEASE) {
request->reply->code = 0;
}
if (request->reply->code == 0) {
return 1;
}
request->reply->sockfd = request->packet->sockfd;
/*
* Copy specific fields from packet to reply, if they
* don't already exist
*/
for (i = 0; i < sizeof(attrnums) / sizeof(attrnums[0]); i++) {
uint32_t attr = attrnums[i];
if (pairfind(request->reply->vps, DHCP2ATTR(attr))) continue;
if ((vp = pairfind(request->packet->vps, DHCP2ATTR(attr)))) {
pairadd(&request->reply->vps, paircopyvp(vp));
}
}
vp = pairfind(request->reply->vps, DHCP2ATTR(256)); /* DHCP-Opcode */
rad_assert(vp != NULL);
vp->vp_integer = 2; /* BOOTREPLY */
/*
* Prepare the reply packet for sending through dhcp_socket_send()
*/
request->reply->dst_ipaddr.af = AF_INET;
request->reply->src_ipaddr.af = AF_INET;
request->reply->src_ipaddr.ipaddr.ip4addr.s_addr = sock->src_ipaddr.ipaddr.ip4addr.s_addr;
request->reply->dst_port = request->packet->src_port;
request->reply->src_port = request->packet->dst_port;
vp = pairfind(request->reply->vps, DHCP2ATTR(266)); /* DHCP-Gateway-IP-Address */
if (vp && (vp->vp_ipaddr != htonl(INADDR_ANY))) {
/* Answer to client's nearest DHCP relay */
request->reply->dst_ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
} else if ((request->reply->code == PW_DHCP_NAK) ||
((vp = pairfind(request->reply->vps, DHCP2ATTR(262))) /* DHCP-Flags */ &&
(vp->vp_integer & 0x8000) &&
((vp = pairfind(request->reply->vps, DHCP2ATTR(263))) /* DHCP-Client-IP-Address */ &&
(vp->vp_ipaddr == htonl(INADDR_ANY))))) {
/*
* RFC 2131, page 23
*
* Broadcast on
* - DHCPNAK
* or
* - Broadcast flag is set up and ciaddr == NULL
*/
request->reply->dst_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_BROADCAST);
} else {
/*
* RFC 2131, page 23
*
* Unicast to
* - ciaddr if present
* otherwise to yiaddr
*/
if ((vp = pairfind(request->reply->vps, DHCP2ATTR(263))) /* DHCP-Client-IP-Address */ &&
(vp->vp_ipaddr != htonl(INADDR_ANY))) {
request->reply->dst_ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
} else {
vp = pairfind(request->reply->vps, DHCP2ATTR(264)); /* DHCP-Your-IP-Address */
if (!vp) {
DEBUG("DHCP: Failed to find IP Address for request.");
return -1;
}
request->reply->dst_ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
/*
* When sending a DHCP_OFFER, make sure our ARP table
* contains an entry for the client IP address, or else
* packet may not be forwarded if it was the first time
* the client was requesting an IP address.
*/
if (request->reply->code == PW_DHCP_OFFER) {
VALUE_PAIR *hwvp = pairfind(request->reply->vps, DHCP2ATTR(267)); /* DHCP-Client-Hardware-Address */
if (!hwvp) return -1;
if (fr_dhcp_add_arp_entry(request->reply->sockfd, sock->src_interface, hwvp, vp) < 0) {
return -1;
}
}
}
}
return 1;
}
