/* Stash the number VAL into BUF's field F. */
void
field_set_num(struct field *f, u_int8_t *buf, u_int32_t val)
{
switch (f->len) {
case 1:
buf[f->offset] = val;
break;
case 2:
encode_16(buf + f->offset, val);
break;
case 4:
encode_32(buf + f->offset, val);
break;
}
}
/*
* When we are "the server", this starts SET/ACK mode
* When we are "the client", this starts REQ/REPLY mode
*/
static int
cfg_initiator_send_ATTR(struct message *msg)
{
struct sa *isakmp_sa = msg->isakmp_sa;
struct ipsec_exch *ie = msg->exchange->data;
u_int8_t *hashp = 0, *attrp, *attr;
size_t attrlen, off;
char *id_string, *cfg_mode, *field;
struct sockaddr *sa;
#define CFG_ATTR_BIT_MAX ISAKMP_CFG_ATTR_FUTURE_MIN /* XXX */
bitstr_t bit_decl(attrbits, CFG_ATTR_BIT_MAX);
u_int16_t bit, length;
u_int32_t life;
if (msg->exchange->phase == 2) {
hashp = cfg_add_hash(msg);
if (!hashp)
return -1;
}
/* We initiated this exchange, check isakmp_sa for other side. */
if (isakmp_sa->initiator)
id_string = ipsec_id_string(isakmp_sa->id_r,
isakmp_sa->id_r_len);
else
id_string = ipsec_id_string(isakmp_sa->id_i,
isakmp_sa->id_i_len);
if (!id_string) {
log_print("cfg_initiator_send_ATTR: cannot parse ID");
goto fail;
}
/* Check for attribute list to send to the other side */
attrlen = 0;
bit_nclear(attrbits, 0, CFG_ATTR_BIT_MAX - 1);
cfg_mode = conf_get_str(id_string, "Mode");
if (!cfg_mode || strcmp(cfg_mode, "SET") == 0) {
/* SET/ACK mode */
ie->cfg_type = ISAKMP_CFG_SET;
LOG_DBG((LOG_NEGOTIATION, 10,
"cfg_initiator_send_ATTR: SET/ACK mode"));
#define ATTRFIND(STR,ATTR4,LEN4,ATTR6,LEN6) do \
{ \
if ((sa = conf_get_address (id_string, STR)) != NULL) \
switch (sa->sa_family) { \
case AF_INET: \
bit_set (attrbits, ATTR4); \
attrlen += ISAKMP_ATTR_SZ + LEN4; \
break; \
case AF_INET6: \
bit_set (attrbits, ATTR6); \
attrlen += ISAKMP_ATTR_SZ + LEN6; \
break; \
default: \
break; \
} \
free (sa); \
} while (0)
/*
* XXX We don't simultaneously support IPv4 and IPv6
* addresses.
*/
ATTRFIND("Address", ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS, 4,
ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS, 16);
ATTRFIND("Netmask", ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK, 4,
ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK, 16);
ATTRFIND("Nameserver", ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS, 4,
ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS, 16);
ATTRFIND("WINS-server", ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS, 4,
ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS, 16);
ATTRFIND("DHCP-server", ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP, 4,
ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP, 16);
#ifdef notyet
ATTRFIND("Network", ISAKMP_CFG_ATTR_INTERNAL_IP4_SUBNET, 8,
ISAKMP_CFG_ATTR_INTERNAL_IP6_SUBNET, 17);
#endif
#undef ATTRFIND
if (conf_get_str(id_string, "Lifetime")) {
bit_set(attrbits,
ISAKMP_CFG_ATTR_INTERNAL_ADDRESS_EXPIRY);
attrlen += ISAKMP_ATTR_SZ + 4;
}
} else {
struct conf_list *alist;
struct conf_list_node *anode;
ie->cfg_type = ISAKMP_CFG_REQUEST;
LOG_DBG((LOG_NEGOTIATION, 10,
"cfg_initiator_send_ATTR: REQ/REPLY mode"));
alist = conf_get_list(id_string, "Attributes");
if (alist) {
for (anode = TAILQ_FIRST(&alist->fields); anode;
anode = TAILQ_NEXT(anode, link)) {
if (strcasecmp(anode->field, "Address") == 0) {
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS);
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS);
attrlen += ISAKMP_ATTR_SZ * 2;
} else if (strcasecmp(anode->field, "Netmask")
== 0) {
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK);
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK);
attrlen += ISAKMP_ATTR_SZ * 2;
} else if (strcasecmp(anode->field,
"Nameserver") == 0) {
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS);
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS);
attrlen += ISAKMP_ATTR_SZ * 2;
} else if (strcasecmp(anode->field,
"WINS-server") == 0) {
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS);
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS);
attrlen += ISAKMP_ATTR_SZ * 2;
} else if (strcasecmp(anode->field,
"DHCP-server") == 0) {
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP);
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP);
attrlen += ISAKMP_ATTR_SZ * 2;
} else if (strcasecmp(anode->field,
"Lifetime") == 0) {
bit_set(attrbits, ISAKMP_CFG_ATTR_INTERNAL_ADDRESS_EXPIRY);
attrlen += ISAKMP_ATTR_SZ;
} else {
log_print("cfg_initiator_send_ATTR: "
"unknown attribute %.20s in "
"section [%s]", anode->field,
id_string);
}
}
conf_free_list(alist);
}
}
if (attrlen == 0) {
/* No data found. */
log_print("cfg_initiator_send_ATTR: no IKECFG attributes "
"found for [%s]", id_string);
/*
* We can continue, but this indicates a configuration error
* that the user probably will want to correct.
*/
free(id_string);
return 0;
}
attrlen += ISAKMP_ATTRIBUTE_SZ;
attrp = calloc(1, attrlen);
if (!attrp) {
log_error("cfg_initiator_send_ATTR: calloc (1, %lu) failed",
(unsigned long)attrlen);
goto fail;
}
if (message_add_payload(msg, ISAKMP_PAYLOAD_ATTRIBUTE, attrp, attrlen,
1)) {
free(attrp);
goto fail;
}
SET_ISAKMP_ATTRIBUTE_TYPE(attrp, ie->cfg_type);
getrandom((u_int8_t *) & ie->cfg_id, sizeof ie->cfg_id);
SET_ISAKMP_ATTRIBUTE_ID(attrp, ie->cfg_id);
off = ISAKMP_ATTRIBUTE_SZ;
/*
* Use the bitstring built previously to collect the right
* parameters for attrp.
*/
for (bit = 0; bit < CFG_ATTR_BIT_MAX; bit++)
if (bit_test(attrbits, bit)) {
attr = attrp + off;
SET_ISAKMP_ATTR_TYPE(attr, bit);
if (ie->cfg_type == ISAKMP_CFG_REQUEST) {
off += ISAKMP_ATTR_SZ;
continue;
}
/* All the other are similar, this is the odd one. */
if (bit == ISAKMP_CFG_ATTR_INTERNAL_ADDRESS_EXPIRY) {
life = conf_get_num(id_string, "Lifetime",
1200);
SET_ISAKMP_ATTR_LENGTH_VALUE(attr, 4);
encode_32(attr + ISAKMP_ATTR_VALUE_OFF, life);
off += ISAKMP_ATTR_SZ + 4;
continue;
}
switch (bit) {
case ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS:
length = 4;
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS:
length = 16;
break;
default:
length = 0; /* Silence gcc. */
}
switch (bit) {
case ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS:
field = "Address";
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK:
field = "Netmask";
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS:
field = "Nameserver";
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP:
field = "DHCP-server";
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS:
field = "WINS-server";
break;
default:
field = 0; /* Silence gcc. */
}
sa = conf_get_address(id_string, field);
SET_ISAKMP_ATTR_LENGTH_VALUE(attr, length);
memcpy(attr + ISAKMP_ATTR_VALUE_OFF,
sockaddr_addrdata(sa), length);
free(sa);
off += ISAKMP_ATTR_SZ + length;
}
if (msg->exchange->phase == 2)
if (cfg_finalize_hash(msg, hashp, attrp, attrlen))
goto fail;
return 0;
fail:
free(id_string);
return -1;
}
/*
* Encode list of attributes from ie->attrs into a attribute payload.
*/
static int
cfg_encode_attributes(struct isakmp_cfg_attr_head *attrs, u_int32_t type,
u_int32_t cfg_id, char *id_string, u_int8_t **attrp, u_int16_t *len)
{
struct isakmp_cfg_attr *attr;
struct sockaddr *sa;
sa_family_t family;
u_int32_t value;
u_int16_t off;
char *field;
/* Compute length */
*len = ISAKMP_ATTRIBUTE_SZ;
for (attr = LIST_FIRST(attrs); attr; attr = LIST_NEXT(attr, link)) {
/* With ACK we only include the attrs we've actually used. */
if (type == ISAKMP_CFG_ACK && attr->attr_used == 0)
continue;
switch (attr->type) {
case ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS:
case ISAKMP_CFG_ATTR_INTERNAL_ADDRESS_EXPIRY:
attr->length = 4;
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_SUBNET:
attr->length = 8;
break;
case ISAKMP_CFG_ATTR_APPLICATION_VERSION:
/* XXX So far no version identifier of isakmpd here. */
attr->length = 0;
break;
case ISAKMP_CFG_ATTR_SUPPORTED_ATTRIBUTES:
attr->length = 2 * 15;
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS:
attr->length = 16;
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP6_SUBNET:
attr->length = 17;
break;
default:
attr->ignore++;
/* XXX Log! */
}
*len += ISAKMP_ATTR_SZ + attr->length;
}
/* Allocate enough space for the payload */
*attrp = calloc(1, *len);
if (!*attrp) {
log_error("cfg_encode_attributes: calloc (1, %lu) failed",
(unsigned long)*len);
return -1;
}
SET_ISAKMP_ATTRIBUTE_TYPE(*attrp, type);
SET_ISAKMP_ATTRIBUTE_ID(*attrp, cfg_id);
off = ISAKMP_ATTRIBUTE_SZ;
for (attr = LIST_FIRST(attrs); attr; attr = LIST_NEXT(attr, link)) {
/* With ACK we only include the attrs we've actually used. */
if (type == ISAKMP_CFG_ACK && attr->attr_used == 0)
continue;
switch (attr->type) {
case ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_SUBNET:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS:
family = AF_INET;
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_SUBNET:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS:
family = AF_INET6;
break;
default:
family = 0;
break;
}
switch (attr->type) {
case ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS:
field = "Address";
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_SUBNET:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_SUBNET:
field = "Network"; /* XXX or just "Address" */
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK:
field = "Netmask";
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP:
field = "DHCP-server";
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS:
field = "Nameserver";
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS:
field = "WINS-server";
break;
default:
field = 0;
}
switch (attr->type) {
case ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS:
sa = conf_get_address(id_string, field);
if (!sa) {
LOG_DBG((LOG_NEGOTIATION, 10,
"cfg_responder_send_ATTR: "
"attribute not found: %s", field));
attr->length = 0;
break;
}
if (sa->sa_family != family) {
log_print("cfg_responder_send_ATTR: "
"attribute %s - expected %s got %s data",
field,
(family == AF_INET ? "IPv4" : "IPv6"),
(sa->sa_family ==
AF_INET ? "IPv4" : "IPv6"));
free(sa);
attr->length = 0;
break;
}
/* Temporary limit length for the _SUBNET types. */
if (attr->type == ISAKMP_CFG_ATTR_INTERNAL_IP4_SUBNET)
attr->length = 4;
else if (attr->type ==
ISAKMP_CFG_ATTR_INTERNAL_IP6_SUBNET)
attr->length = 16;
memcpy(*attrp + off + ISAKMP_ATTR_VALUE_OFF,
sockaddr_addrdata(sa), attr->length);
free(sa);
/* _SUBNET types need some extra work. */
if (attr->type ==
ISAKMP_CFG_ATTR_INTERNAL_IP4_SUBNET) {
sa = conf_get_address(id_string, "Netmask");
if (!sa) {
LOG_DBG((LOG_NEGOTIATION, 10,
"cfg_responder_send_ATTR: "
"attribute not found: Netmask"));
attr->length = 0;
break;
}
if (sa->sa_family != AF_INET) {
log_print("cfg_responder_send_ATTR: "
"attribute Netmask - expected "
"IPv4 got IPv6 data");
free(sa);
attr->length = 0;
break;
}
memcpy(*attrp + off + ISAKMP_ATTR_VALUE_OFF +
attr->length, sockaddr_addrdata(sa),
attr->length);
attr->length = 8;
free(sa);
} else if (attr->type ==
ISAKMP_CFG_ATTR_INTERNAL_IP6_SUBNET) {
int prefix = conf_get_num(id_string, "Prefix",
-1);
if (prefix == -1) {
log_print("cfg_responder_send_ATTR: "
"attribute not found: Prefix");
attr->length = 0;
break;
} else if (prefix < -1 || prefix > 128) {
log_print("cfg_responder_send_ATTR: "
"attribute Prefix - invalid "
"value %d", prefix);
attr->length = 0;
break;
}
*(*attrp + off + ISAKMP_ATTR_VALUE_OFF + 16) =
(u_int8_t)prefix;
attr->length = 17;
}
break;
case ISAKMP_CFG_ATTR_INTERNAL_ADDRESS_EXPIRY:
value = conf_get_num(id_string, "Lifetime", 1200);
encode_32(*attrp + off + ISAKMP_ATTR_VALUE_OFF, value);
break;
case ISAKMP_CFG_ATTR_APPLICATION_VERSION:
/* XXX So far no version identifier of isakmpd here. */
break;
case ISAKMP_CFG_ATTR_SUPPORTED_ATTRIBUTES:
break;
default:
break;
}
SET_ISAKMP_ATTR_TYPE(*attrp + off, attr->type);
SET_ISAKMP_ATTR_LENGTH_VALUE(*attrp + off, attr->length);
off += ISAKMP_ATTR_VALUE_OFF + attr->length;
}
return 0;
}
