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-rw-r--r--net/sctp/associola.c21
-rw-r--r--net/sctp/sm_make_chunk.c162
-rw-r--r--net/sctp/sm_sideeffect.c5
-rw-r--r--net/sctp/sm_statefuns.c35
4 files changed, 219 insertions, 4 deletions
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index ee4b212e66b..3bdd8dcb76a 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -415,6 +415,9 @@ void sctp_association_free(struct sctp_association *asoc)
/* Free peer's cached cookie. */
kfree(asoc->peer.cookie);
+ kfree(asoc->peer.peer_random);
+ kfree(asoc->peer.peer_chunks);
+ kfree(asoc->peer.peer_hmacs);
/* Release the transport structures. */
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
@@ -1145,7 +1148,23 @@ void sctp_assoc_update(struct sctp_association *asoc,
}
}
- /* SCTP-AUTH: XXX something needs to be done here*/
+ /* SCTP-AUTH: Save the peer parameters from the new assocaitions
+ * and also move the association shared keys over
+ */
+ kfree(asoc->peer.peer_random);
+ asoc->peer.peer_random = new->peer.peer_random;
+ new->peer.peer_random = NULL;
+
+ kfree(asoc->peer.peer_chunks);
+ asoc->peer.peer_chunks = new->peer.peer_chunks;
+ new->peer.peer_chunks = NULL;
+
+ kfree(asoc->peer.peer_hmacs);
+ asoc->peer.peer_hmacs = new->peer.peer_hmacs;
+ new->peer.peer_hmacs = NULL;
+
+ sctp_auth_key_put(asoc->asoc_shared_key);
+ sctp_auth_asoc_init_active_key(asoc, GFP_ATOMIC);
}
/* Update the retran path for sending a retransmitted packet.
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 71cc204a9ea..4c02875786a 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -182,6 +182,8 @@ struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
sctp_supported_ext_param_t ext_param;
int num_ext = 0;
__u8 extensions[3];
+ sctp_paramhdr_t *auth_chunks = NULL,
+ *auth_hmacs = NULL;
/* RFC 2960 3.3.2 Initiation (INIT) (1)
*
@@ -214,8 +216,6 @@ struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
* An implementation supporting this extension [ADDIP] MUST list
* the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
* INIT-ACK parameters.
- * XXX: We don't support AUTH just yet, so don't list it. AUTH
- * support should add it.
*/
if (sctp_addip_enable) {
extensions[num_ext] = SCTP_CID_ASCONF;
@@ -226,6 +226,29 @@ struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
chunksize += sizeof(aiparam);
chunksize += vparam_len;
+ /* Account for AUTH related parameters */
+ if (sctp_auth_enable) {
+ /* Add random parameter length*/
+ chunksize += sizeof(asoc->c.auth_random);
+
+ /* Add HMACS parameter length if any were defined */
+ auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
+ if (auth_hmacs->length)
+ chunksize += ntohs(auth_hmacs->length);
+ else
+ auth_hmacs = NULL;
+
+ /* Add CHUNKS parameter length */
+ auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
+ if (auth_chunks->length)
+ chunksize += ntohs(auth_chunks->length);
+ else
+ auth_hmacs = NULL;
+
+ extensions[num_ext] = SCTP_CID_AUTH;
+ num_ext += 1;
+ }
+
/* If we have any extensions to report, account for that */
if (num_ext)
chunksize += sizeof(sctp_supported_ext_param_t) + num_ext;
@@ -285,6 +308,17 @@ struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
aiparam.adaptation_ind = htonl(sp->adaptation_ind);
sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
+ /* Add SCTP-AUTH chunks to the parameter list */
+ if (sctp_auth_enable) {
+ sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
+ asoc->c.auth_random);
+ if (auth_hmacs)
+ sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
+ auth_hmacs);
+ if (auth_chunks)
+ sctp_addto_chunk(retval, ntohs(auth_chunks->length),
+ auth_chunks);
+ }
nodata:
kfree(addrs.v);
return retval;
@@ -305,6 +339,9 @@ struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
sctp_supported_ext_param_t ext_param;
int num_ext = 0;
__u8 extensions[3];
+ sctp_paramhdr_t *auth_chunks = NULL,
+ *auth_hmacs = NULL,
+ *auth_random = NULL;
retval = NULL;
@@ -350,6 +387,26 @@ struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
chunksize += sizeof(ext_param) + num_ext;
chunksize += sizeof(aiparam);
+ if (asoc->peer.auth_capable) {
+ auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
+ chunksize += ntohs(auth_random->length);
+
+ auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
+ if (auth_hmacs->length)
+ chunksize += ntohs(auth_hmacs->length);
+ else
+ auth_hmacs = NULL;
+
+ auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
+ if (auth_chunks->length)
+ chunksize += ntohs(auth_chunks->length);
+ else
+ auth_chunks = NULL;
+
+ extensions[num_ext] = SCTP_CID_AUTH;
+ num_ext += 1;
+ }
+
/* Now allocate and fill out the chunk. */
retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
if (!retval)
@@ -381,6 +438,17 @@ struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
aiparam.adaptation_ind = htonl(sctp_sk(asoc->base.sk)->adaptation_ind);
sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
+ if (asoc->peer.auth_capable) {
+ sctp_addto_chunk(retval, ntohs(auth_random->length),
+ auth_random);
+ if (auth_hmacs)
+ sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
+ auth_hmacs);
+ if (auth_chunks)
+ sctp_addto_chunk(retval, ntohs(auth_chunks->length),
+ auth_chunks);
+ }
+
/* We need to remove the const qualifier at this point. */
retval->asoc = (struct sctp_association *) asoc;
@@ -1736,6 +1804,12 @@ static void sctp_process_ext_param(struct sctp_association *asoc,
!asoc->peer.prsctp_capable)
asoc->peer.prsctp_capable = 1;
break;
+ case SCTP_CID_AUTH:
+ /* if the peer reports AUTH, assume that he
+ * supports AUTH.
+ */
+ asoc->peer.auth_capable = 1;
+ break;
case SCTP_CID_ASCONF:
case SCTP_CID_ASCONF_ACK:
/* don't need to do anything for ASCONF */
@@ -1871,7 +1945,42 @@ static int sctp_verify_param(const struct sctp_association *asoc,
case SCTP_PARAM_FWD_TSN_SUPPORT:
if (sctp_prsctp_enable)
break;
+ goto fallthrough;
+
+ case SCTP_PARAM_RANDOM:
+ if (!sctp_auth_enable)
+ goto fallthrough;
+
+ /* SCTP-AUTH: Secion 6.1
+ * If the random number is not 32 byte long the association
+ * MUST be aborted. The ABORT chunk SHOULD contain the error
+ * cause 'Protocol Violation'.
+ */
+ if (SCTP_AUTH_RANDOM_LENGTH !=
+ ntohs(param.p->length) - sizeof(sctp_paramhdr_t))
+ return sctp_process_inv_paramlength(asoc, param.p,
+ chunk, err_chunk);
+ break;
+
+ case SCTP_PARAM_CHUNKS:
+ if (!sctp_auth_enable)
+ goto fallthrough;
+
+ /* SCTP-AUTH: Section 3.2
+ * The CHUNKS parameter MUST be included once in the INIT or
+ * INIT-ACK chunk if the sender wants to receive authenticated
+ * chunks. Its maximum length is 260 bytes.
+ */
+ if (260 < ntohs(param.p->length))
+ return sctp_process_inv_paramlength(asoc, param.p,
+ chunk, err_chunk);
+ break;
+
+ case SCTP_PARAM_HMAC_ALGO:
+ if (!sctp_auth_enable)
+ break;
/* Fall Through */
+fallthrough:
default:
SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
ntohs(param.p->type), cid);
@@ -1976,13 +2085,19 @@ int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
}
/* Process the initialization parameters. */
-
sctp_walk_params(param, peer_init, init_hdr.params) {
if (!sctp_process_param(asoc, param, peer_addr, gfp))
goto clean_up;
}
+ /* AUTH: After processing the parameters, make sure that we
+ * have all the required info to potentially do authentications.
+ */
+ if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
+ !asoc->peer.peer_hmacs))
+ asoc->peer.auth_capable = 0;
+
/* Walk list of transports, removing transports in the UNKNOWN state. */
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
transport = list_entry(pos, struct sctp_transport, transports);
@@ -2222,6 +2337,47 @@ static int sctp_process_param(struct sctp_association *asoc,
break;
}
/* Fall Through */
+ goto fall_through;
+
+ case SCTP_PARAM_RANDOM:
+ if (!sctp_auth_enable)
+ goto fall_through;
+
+ /* Save peer's random parameter */
+ asoc->peer.peer_random = kmemdup(param.p,
+ ntohs(param.p->length), gfp);
+ if (!asoc->peer.peer_random) {
+ retval = 0;
+ break;
+ }
+ break;
+
+ case SCTP_PARAM_HMAC_ALGO:
+ if (!sctp_auth_enable)
+ goto fall_through;
+
+ /* Save peer's HMAC list */
+ asoc->peer.peer_hmacs = kmemdup(param.p,
+ ntohs(param.p->length), gfp);
+ if (!asoc->peer.peer_hmacs) {
+ retval = 0;
+ break;
+ }
+
+ /* Set the default HMAC the peer requested*/
+ sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
+ break;
+
+ case SCTP_PARAM_CHUNKS:
+ if (!sctp_auth_enable)
+ goto fall_through;
+
+ asoc->peer.peer_chunks = kmemdup(param.p,
+ ntohs(param.p->length), gfp);
+ if (!asoc->peer.peer_chunks)
+ retval = 0;
+ break;
+fall_through:
default:
/* Any unrecognized parameters should have been caught
* and handled by sctp_verify_param() which should be
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 8d789008349..bbdc938da86 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -1524,6 +1524,11 @@ static int sctp_cmd_interpreter(sctp_event_t event_type,
sctp_cmd_adaptation_ind(commands, asoc);
break;
+ case SCTP_CMD_ASSOC_SHKEY:
+ error = sctp_auth_asoc_init_active_key(asoc,
+ GFP_ATOMIC);
+ break;
+
default:
printk(KERN_WARNING "Impossible command: %u, %p\n",
cmd->verb, cmd->obj.ptr);
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index ec0328b1cdb..385486360fe 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -549,6 +549,11 @@ sctp_disposition_t sctp_sf_do_5_1C_ack(const struct sctp_endpoint *ep,
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
SCTP_STATE(SCTP_STATE_COOKIE_ECHOED));
+ /* SCTP-AUTH: genereate the assocition shared keys so that
+ * we can potentially signe the COOKIE-ECHO.
+ */
+ sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_SHKEY, SCTP_NULL());
+
/* 5.1 C) "A" shall then send the State Cookie received in the
* INIT ACK chunk in a COOKIE ECHO chunk, ...
*/
@@ -686,6 +691,14 @@ sctp_disposition_t sctp_sf_do_5_1D_ce(const struct sctp_endpoint *ep,
peer_init, GFP_ATOMIC))
goto nomem_init;
+ /* SCTP-AUTH: Now that we've populate required fields in
+ * sctp_process_init, set up the assocaition shared keys as
+ * necessary so that we can potentially authenticate the ACK
+ */
+ error = sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC);
+ if (error)
+ goto nomem_init;
+
repl = sctp_make_cookie_ack(new_asoc, chunk);
if (!repl)
goto nomem_init;
@@ -1247,6 +1260,26 @@ static void sctp_tietags_populate(struct sctp_association *new_asoc,
new_asoc->c.initial_tsn = asoc->c.initial_tsn;
}
+static void sctp_auth_params_populate(struct sctp_association *new_asoc,
+ const struct sctp_association *asoc)
+{
+ /* Only perform this if AUTH extension is enabled */
+ if (!sctp_auth_enable)
+ return;
+
+ /* We need to provide the same parameter information as
+ * was in the original INIT. This means that we need to copy
+ * the HMACS, CHUNKS, and RANDOM parameter from the original
+ * assocaition.
+ */
+ memcpy(new_asoc->c.auth_random, asoc->c.auth_random,
+ sizeof(asoc->c.auth_random));
+ memcpy(new_asoc->c.auth_hmacs, asoc->c.auth_hmacs,
+ sizeof(asoc->c.auth_hmacs));
+ memcpy(new_asoc->c.auth_chunks, asoc->c.auth_chunks,
+ sizeof(asoc->c.auth_chunks));
+}
+
/*
* Compare vtag/tietag values to determine unexpected COOKIE-ECHO
* handling action.
@@ -1404,6 +1437,8 @@ static sctp_disposition_t sctp_sf_do_unexpected_init(
sctp_tietags_populate(new_asoc, asoc);
+ sctp_auth_params_populate(new_asoc, asoc);
+
/* B) "Z" shall respond immediately with an INIT ACK chunk. */
/* If there are errors need to be reported for unknown parameters,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-26 05:12:17 +0000