- proposal setup implementation begun
This commit is contained in:
Martin Willi
@@ -26,7 +26,6 @@
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <linux/xfrm.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <fcntl.h>
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@@ -43,6 +42,34 @@
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#define KERNEL_ESP 50
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#define KERNEL_AH 51
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#define SPD_PRIORITY 1024
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typedef struct xfrm_data_t xfrm_data_t;
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/**
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* Lenght/Type/data struct for userdata in xfrm
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*/
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struct xfrm_data_t {
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/**
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* length of the data
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*/
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u_int16_t length;
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/**
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* type of data
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*/
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u_int16_t type;
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/**
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* and the data itself, for different purposes
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*/
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union {
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/* algorithm */
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struct xfrm_algo algo;
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/* policy tmpl */
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struct xfrm_user_tmpl tmpl[2];
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};
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};
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typedef struct netlink_message_t netlink_message_t;
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@@ -57,25 +84,24 @@ struct netlink_message_t {
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struct nlmsghdr hdr;
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union {
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/* error message */
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struct nlmsgerr e;
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struct xfrm_userspi_info spi;
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/* message for spi allocation */
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struct xfrm_userspi_info spi;
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/* message for SA installation */
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struct {
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struct xfrm_usersa_info sa;
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u_int8_t data[512];
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};
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/* message for policy manipulation */
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struct xfrm_userpolicy_id id;
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/* message for policy installation */
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struct {
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struct xfrm_userpolicy_info policy;
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};
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};
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u_int8_t data[512];
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};
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typedef struct netlink_algo_t netlink_algo_t;
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/**
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* Add length and type to xfrm_algo
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*/
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struct netlink_algo_t {
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u_int16_t length;
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u_int16_t type;
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struct xfrm_algo algo;
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};
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typedef struct private_kernel_interface_t private_kernel_interface_t;
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@@ -157,9 +183,13 @@ mapping_t kernel_integrity_algs_m[] = {
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};
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static status_t get_spi(private_kernel_interface_t *this, host_t *src, host_t *dest, protocol_id_t protocol, bool tunnel_mode, u_int32_t *spi)
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static status_t get_spi(private_kernel_interface_t *this,
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host_t *src, host_t *dest,
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protocol_id_t protocol, u_int32_t reqid,
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u_int32_t *spi)
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{
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netlink_message_t request, *response;
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status_t status = SUCCESS;
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memset(&request, 0, sizeof(request));
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request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.spi)));
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@@ -167,8 +197,8 @@ static status_t get_spi(private_kernel_interface_t *this, host_t *src, host_t *d
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request.hdr.nlmsg_type = XFRM_MSG_ALLOCSPI;
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request.spi.info.saddr = src->get_xfrm_addr(src);
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request.spi.info.id.daddr = dest->get_xfrm_addr(dest);
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request.spi.info.mode = tunnel_mode;
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/* TODO: this should be done with getprotobyname() */
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request.spi.info.mode = TRUE; /* tunnel mode */
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request.spi.info.reqid = reqid;
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request.spi.info.id.proto = (protocol == ESP) ? KERNEL_ESP : KERNEL_AH;
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request.spi.info.family = PF_INET;
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request.spi.min = 100;
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@@ -176,27 +206,25 @@ static status_t get_spi(private_kernel_interface_t *this, host_t *src, host_t *d
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if (this->send_message(this, &request, &response) != SUCCESS)
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{
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return FAILED;
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status = FAILED;
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}
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if (response->hdr.nlmsg_type == NLMSG_ERROR)
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else if (response->hdr.nlmsg_type == NLMSG_ERROR)
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{
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return FAILED;
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status = FAILED;
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}
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if (response->hdr.nlmsg_type != XFRM_MSG_NEWSA)
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else if (response->hdr.nlmsg_type != XFRM_MSG_NEWSA)
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{
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return FAILED;
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status = FAILED;
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}
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else if (response->hdr.nlmsg_len < NLMSG_LENGTH(sizeof(response->sa)))
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{
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return FAILED;
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status = FAILED;
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}
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*spi = response->sa.id.spi;
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allocator_free(response);
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return SUCCESS;
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return status;
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}
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static status_t add_sa( private_kernel_interface_t *this,
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@@ -204,7 +232,7 @@ static status_t add_sa( private_kernel_interface_t *this,
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host_t *other,
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u_int32_t spi,
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int protocol,
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bool tunnel_mode,
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u_int32_t reqid,
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encryption_algorithm_t enc_alg,
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chunk_t encryption_key,
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integrity_algorithm_t int_alg,
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@@ -213,7 +241,7 @@ static status_t add_sa( private_kernel_interface_t *this,
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{
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netlink_message_t request, *response;
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memset(&request, 0, sizeof(request));
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status_t status;
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request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
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request.hdr.nlmsg_type = replace ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
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@@ -222,12 +250,11 @@ static status_t add_sa( private_kernel_interface_t *this,
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request.sa.id.daddr = other->get_xfrm_addr(other);
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request.sa.id.spi = spi;
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/* TODO: this should be done with getprotobyname() */
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request.sa.id.proto = (protocol == ESP) ? KERNEL_ESP : KERNEL_AH;
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request.sa.family = me->get_family(me);
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request.sa.mode = tunnel_mode;
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request.sa.mode = TRUE; /* tunnel mode */
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request.sa.replay_window = 0; //sa->replay_window; ???
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request.sa.reqid = 0; //sa->reqid; ???
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request.sa.reqid = reqid;
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request.sa.lft.soft_byte_limit = XFRM_INF;
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request.sa.lft.soft_packet_limit = XFRM_INF;
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request.sa.lft.hard_byte_limit = XFRM_INF;
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@@ -237,43 +264,139 @@ static status_t add_sa( private_kernel_interface_t *this,
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if (enc_alg != ENCR_UNDEFINED)
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{
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netlink_algo_t *nla = (netlink_algo_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
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xfrm_data_t *data = (xfrm_data_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
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nla->type = XFRMA_ALG_CRYPT;
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nla->length = sizeof(netlink_algo_t) + encryption_key.len;
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nla->algo.alg_key_len = encryption_key.len * 8;
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data->type = XFRMA_ALG_CRYPT;
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data->length = 4 + sizeof(data->algo) + encryption_key.len;
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data->algo.alg_key_len = encryption_key.len * 8;
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strcpy(nla->algo.alg_name, mapping_find(kernel_encryption_algs_m, enc_alg));
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memcpy(nla->algo.alg_key, encryption_key.ptr, encryption_key.len);
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strcpy(data->algo.alg_name, mapping_find(kernel_encryption_algs_m, enc_alg));
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memcpy(data->algo.alg_key, encryption_key.ptr, encryption_key.len);
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request.hdr.nlmsg_len += nla->length;
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request.hdr.nlmsg_len += data->length;
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}
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if (int_alg != AUTH_UNDEFINED)
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{
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netlink_algo_t *nla = (netlink_algo_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
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xfrm_data_t *data = (xfrm_data_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
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nla->type = XFRMA_ALG_AUTH;
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nla->length = sizeof(netlink_algo_t) + integrity_key.len;
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nla->algo.alg_key_len = integrity_key.len * 8;
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strcpy(nla->algo.alg_name, mapping_find(kernel_integrity_algs_m, int_alg));
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memcpy(nla->algo.alg_key, integrity_key.ptr, integrity_key.len);
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data->type = XFRMA_ALG_AUTH;
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data->length = 4 + sizeof(data->algo) + integrity_key.len;
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data->algo.alg_key_len = integrity_key.len * 8;
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strcpy(data->algo.alg_name, mapping_find(kernel_integrity_algs_m, int_alg));
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memcpy(data->algo.alg_key, integrity_key.ptr, integrity_key.len);
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request.hdr.nlmsg_len += nla->length;
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request.hdr.nlmsg_len += data->length;
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}
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/* add IPComp here*/
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if (this->send_message(this, &request, &response) != SUCCESS)
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{
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allocator_free(response);
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return FAILED;
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status = FAILED;
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}
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else if (response->hdr.nlmsg_type != NLMSG_ERROR)
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{
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status = FAILED;
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}
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else if (response->e.error)
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{
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status = FAILED;
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}
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allocator_free(response);
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return SUCCESS;
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}
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static status_t add_policy(private_kernel_interface_t *this,
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host_t *me, host_t *other,
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host_t *src, host_t *dst,
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u_int8_t src_hostbits, u_int8_t dst_hostbits,
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int direction, int upper_proto,
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bool ah, bool esp,
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u_int32_t reqid)
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{
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netlink_message_t request, *response;
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status_t status = SUCCESS;
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memset(&request, 0, sizeof(request));
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request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
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request.policy.sel.sport = htons(src->get_port(src));
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request.policy.sel.dport = htons(dst->get_port(dst));
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request.policy.sel.sport_mask = (request.policy.sel.sport) ? ~0 : 0;
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request.policy.sel.dport_mask = (request.policy.sel.dport) ? ~0 : 0;
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request.policy.sel.saddr = src->get_xfrm_addr(src);
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request.policy.sel.daddr = dst->get_xfrm_addr(dst);
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request.policy.sel.prefixlen_s = src_hostbits;
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request.policy.sel.prefixlen_d = dst_hostbits;
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request.policy.sel.proto = upper_proto;
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request.policy.sel.family = src->get_family(src);
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request.policy.dir = direction;
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request.policy.priority = SPD_PRIORITY;
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request.policy.action = XFRM_POLICY_ALLOW;
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request.policy.share = XFRM_SHARE_ANY;
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request.policy.lft.soft_byte_limit = XFRM_INF;
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request.policy.lft.soft_packet_limit = XFRM_INF;
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request.policy.lft.hard_byte_limit = XFRM_INF;
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request.policy.lft.hard_packet_limit = XFRM_INF;
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request.hdr.nlmsg_type = XFRM_MSG_NEWPOLICY;
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request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.policy)));
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if (esp || ah)
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{
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xfrm_data_t *data;
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int tmpl_pos = 0;
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data = (xfrm_data_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
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data->type = XFRMA_TMPL;
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if (esp)
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{
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data->tmpl[tmpl_pos].reqid = reqid;
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data->tmpl[tmpl_pos].id.proto = KERNEL_ESP;
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data->tmpl[tmpl_pos].aalgos = data->tmpl[tmpl_pos].ealgos = data->tmpl[tmpl_pos].calgos = ~0;
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data->tmpl[tmpl_pos].mode = TRUE;
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data->tmpl[tmpl_pos].saddr = me->get_xfrm_addr(me);
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data->tmpl[tmpl_pos].id.daddr = me->get_xfrm_addr(other);
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tmpl_pos++;
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}
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if (ah)
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{
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data->tmpl[tmpl_pos].reqid = reqid;
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data->tmpl[tmpl_pos].id.proto = KERNEL_AH;
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data->tmpl[tmpl_pos].aalgos = data->tmpl[tmpl_pos].ealgos = data->tmpl[tmpl_pos].calgos = ~0;
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data->tmpl[tmpl_pos].mode = TRUE;
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data->tmpl[tmpl_pos].saddr = me->get_xfrm_addr(me);
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data->tmpl[tmpl_pos].id.daddr = other->get_xfrm_addr(other);
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tmpl_pos++;
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}
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data->length = 4 + sizeof(struct xfrm_user_tmpl) * tmpl_pos;
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request.hdr.nlmsg_len += data->length;
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}
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if (this->send_message(this, &request, &response) != SUCCESS)
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{
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status = FAILED;
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}
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else if (response->hdr.nlmsg_type != NLMSG_ERROR)
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{
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status = FAILED;
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}
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else if (response->e.error)
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{
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status = FAILED;
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}
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allocator_free(response);
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return status;
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}
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static status_t send_message(private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t **response)
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{
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@@ -418,11 +541,9 @@ kernel_interface_t *kernel_interface_create()
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private_kernel_interface_t *this = allocator_alloc_thing(private_kernel_interface_t);
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/* public functions */
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this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,bool,u_int32_t*))get_spi;
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this->public.add_sa = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,int,bool,encryption_algorithm_t,chunk_t,integrity_algorithm_t,chunk_t,bool))add_sa;
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this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,u_int32_t,u_int32_t*))get_spi;
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this->public.add_sa = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,encryption_algorithm_t,chunk_t,integrity_algorithm_t,chunk_t,bool))add_sa;
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this->public.add_policy = (status_t(*)(kernel_interface_t*,host_t*, host_t*,host_t*,host_t*,u_int8_t,u_int8_t,int,int,bool,bool,u_int32_t))add_policy;
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this->public.destroy = (void(*)(kernel_interface_t*)) destroy;
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/* private members */
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@@ -447,6 +568,10 @@ kernel_interface_t *kernel_interface_create()
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charon->kill(charon, "Unable to create netlink thread");
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}
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//host_t *all = host_create(AF_INET, "0.0.0.0", 500);
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//add_policy(this, all, all, all, all, 0, 0, XFRM_POLICY_OUT, 17, FALSE, FALSE, 0);
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charon->logger_manager->enable_logger_level(charon->logger_manager, TESTER, FULL);
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return (&this->public);
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}
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