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CVE-2020-10704: lib util asn1: Add ASN.1 max tree depth
Add maximum parse tree depth to the call to asn1_init, which will be used to limit the depth of the ASN.1 parse tree. Credit to OSS-Fuzz REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20454 BUG: https://bugzilla.samba.org/show_bug.cgi?id=14334 Signed-off-by: Gary Lockyer <gary@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
parent
62621bd686
commit
f467727db5
@ -76,7 +76,7 @@ NTSTATUS gensec_generate_session_info_pac(TALLOC_CTX *mem_ctx,
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static bool gensec_gssapi_check_oid(const DATA_BLOB *blob, const char *oid)
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{
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bool ret = false;
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struct asn1_data *data = asn1_init(NULL);
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struct asn1_data *data = asn1_init(NULL, ASN1_MAX_TREE_DEPTH);
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if (!data) return false;
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@ -34,7 +34,11 @@ int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len)
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struct ldap_message *ldap_msg;
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NTSTATUS status;
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asn1 = asn1_init(mem_ctx);
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/*
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* Need to limit the max parse tree depth to 250 to prevent
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* ASAN detecting stack overflows.
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*/
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asn1 = asn1_init(mem_ctx, 250);
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if (!asn1) {
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goto out;
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}
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@ -36,15 +36,19 @@ struct asn1_data {
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off_t ofs;
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struct nesting *nesting;
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bool has_error;
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unsigned depth;
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unsigned max_depth;
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};
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/* allocate an asn1 structure */
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struct asn1_data *asn1_init(TALLOC_CTX *mem_ctx)
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struct asn1_data *asn1_init(TALLOC_CTX *mem_ctx, unsigned max_depth)
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{
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struct asn1_data *ret = talloc_zero(mem_ctx, struct asn1_data);
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if (ret == NULL) {
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DEBUG(0,("asn1_init failed! out of memory\n"));
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return ret;
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}
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ret->max_depth = max_depth;
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return ret;
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}
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@ -480,6 +484,11 @@ bool asn1_check_BOOLEAN(struct asn1_data *data, bool v)
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/* load a struct asn1_data structure with a lump of data, ready to be parsed */
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bool asn1_load(struct asn1_data *data, DATA_BLOB blob)
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{
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/*
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* Save the maximum depth
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*/
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unsigned max_depth = data->max_depth;
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ZERO_STRUCTP(data);
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data->data = (uint8_t *)talloc_memdup(data, blob.data, blob.length);
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if (!data->data) {
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@ -487,6 +496,7 @@ bool asn1_load(struct asn1_data *data, DATA_BLOB blob)
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return false;
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}
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data->length = blob.length;
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data->max_depth = max_depth;
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return true;
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}
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@ -1119,9 +1129,14 @@ bool asn1_extract_blob(struct asn1_data *asn1, TALLOC_CTX *mem_ctx,
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*/
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void asn1_load_nocopy(struct asn1_data *data, uint8_t *buf, size_t len)
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{
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/*
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* Save max_depth
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*/
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unsigned max_depth = data->max_depth;
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ZERO_STRUCTP(data);
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data->data = buf;
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data->length = len;
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data->max_depth = max_depth;
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}
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int asn1_peek_full_tag(DATA_BLOB blob, uint8_t tag, size_t *packet_size)
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@ -45,7 +45,14 @@ typedef struct asn1_data ASN1_DATA;
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#define ASN1_MAX_OIDS 20
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struct asn1_data *asn1_init(TALLOC_CTX *mem_ctx);
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/*
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* The maximum permitted depth for an ASN.1 parse tree, the limit is chosen
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* to align with the value for windows. Note that this value will trigger
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* ASAN stack overflow errors.
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*/
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#define ASN1_MAX_TREE_DEPTH 512
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struct asn1_data *asn1_init(TALLOC_CTX *mem_ctx, unsigned max_depth);
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void asn1_free(struct asn1_data *data);
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bool asn1_has_error(const struct asn1_data *data);
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void asn1_set_error(struct asn1_data *data);
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@ -330,7 +330,7 @@ static bool test_asn1_Integer(struct torture_context *tctx)
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DATA_BLOB blob;
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int val;
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data = asn1_init(mem_ctx);
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data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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if (!data) {
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goto err;
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}
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@ -296,7 +296,7 @@ ssize_t spnego_read_data(TALLOC_CTX *mem_ctx, DATA_BLOB data, struct spnego_data
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return ret;
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}
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asn1 = asn1_init(mem_ctx);
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asn1 = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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if (asn1 == NULL) {
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return -1;
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}
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@ -339,7 +339,7 @@ ssize_t spnego_read_data(TALLOC_CTX *mem_ctx, DATA_BLOB data, struct spnego_data
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ssize_t spnego_write_data(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, struct spnego_data *spnego)
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{
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struct asn1_data *asn1 = asn1_init(mem_ctx);
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struct asn1_data *asn1 = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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ssize_t ret = -1;
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if (asn1 == NULL) {
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@ -411,7 +411,7 @@ bool spnego_write_mech_types(TALLOC_CTX *mem_ctx,
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DATA_BLOB *blob)
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{
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bool ret = false;
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struct asn1_data *asn1 = asn1_init(mem_ctx);
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struct asn1_data *asn1 = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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if (asn1 == NULL) {
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return false;
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@ -233,7 +233,7 @@ static bool cldap_socket_recv_dgram(struct cldap_socket *c,
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goto error;
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}
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asn1 = asn1_init(in);
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asn1 = asn1_init(in, ASN1_MAX_TREE_DEPTH);
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if (!asn1) {
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goto nomem;
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}
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@ -390,7 +390,7 @@ _PUBLIC_ bool ldap_encode(struct ldap_message *msg,
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const struct ldap_control_handler *control_handlers,
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DATA_BLOB *result, TALLOC_CTX *mem_ctx)
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{
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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int i, j;
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if (!data) return false;
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@ -632,7 +632,7 @@ static void tldap_msg_received(struct tevent_req *subreq)
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goto fail;
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}
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data = asn1_init(talloc_tos());
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data = asn1_init(talloc_tos(), ASN1_MAX_TREE_DEPTH);
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if (data == NULL) {
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status = TLDAP_NO_MEMORY;
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goto fail;
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@ -763,7 +763,7 @@ static struct tevent_req *tldap_req_create(TALLOC_CTX *mem_ctx,
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if (req == NULL) {
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return NULL;
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}
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state->out = asn1_init(state);
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state->out = asn1_init(state, ASN1_MAX_TREE_DEPTH);
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if (state->out == NULL) {
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goto err;
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}
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@ -644,7 +644,7 @@ static struct tevent_req *tldap_ship_paged_search(
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struct tldap_control *pgctrl;
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struct asn1_data *asn1 = NULL;
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asn1 = asn1_init(state);
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asn1 = asn1_init(state, ASN1_MAX_TREE_DEPTH);
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if (asn1 == NULL) {
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return NULL;
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}
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@ -783,7 +783,7 @@ static void tldap_search_paged_done(struct tevent_req *subreq)
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TALLOC_FREE(state->cookie.data);
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asn1 = asn1_init(talloc_tos());
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asn1 = asn1_init(talloc_tos(), ASN1_MAX_TREE_DEPTH);
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if (tevent_req_nomem(asn1, req)) {
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return;
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}
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@ -50,7 +50,7 @@ bool spnego_parse_negTokenInit(TALLOC_CTX *ctx,
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*secblob = data_blob_null;
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}
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data = asn1_init(talloc_tos());
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data = asn1_init(talloc_tos(), ASN1_MAX_TREE_DEPTH);
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if (data == NULL) {
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return false;
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}
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@ -171,7 +171,7 @@ DATA_BLOB spnego_gen_krb5_wrap(TALLOC_CTX *ctx, const DATA_BLOB ticket, const ui
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ASN1_DATA *data;
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DATA_BLOB ret = data_blob_null;
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data = asn1_init(talloc_tos());
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data = asn1_init(talloc_tos(), ASN1_MAX_TREE_DEPTH);
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if (data == NULL) {
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return data_blob_null;
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}
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@ -11975,7 +11975,7 @@ tldap_build_extended_control(enum tldap_extended_val val)
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ZERO_STRUCT(empty_control);
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if (val != EXTENDED_NONE) {
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data = asn1_init(talloc_tos());
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data = asn1_init(talloc_tos(), ASN1_MAX_TREE_DEPTH);
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if (!data) {
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return NULL;
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@ -438,7 +438,7 @@ static DATA_BLOB gensec_gssapi_gen_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLO
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struct asn1_data *data;
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DATA_BLOB ret = data_blob_null;
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data = asn1_init(mem_ctx);
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data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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if (!data || !ticket->data) {
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return ret;
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}
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@ -472,7 +472,7 @@ static DATA_BLOB gensec_gssapi_gen_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLO
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static bool gensec_gssapi_parse_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, DATA_BLOB *ticket, uint8_t tok_id[2])
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{
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bool ret = false;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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int data_remaining;
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if (!data) {
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@ -560,7 +560,7 @@ static void ldapsrv_call_read_done(struct tevent_req *subreq)
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return;
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}
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asn1 = asn1_init(call);
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asn1 = asn1_init(call, ASN1_MAX_TREE_DEPTH);
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if (asn1 == NULL) {
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ldapsrv_terminate_connection(conn, "no memory");
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return;
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@ -284,7 +284,7 @@ static void ldap_connection_recv_done(struct tevent_req *subreq)
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return;
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}
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asn1 = asn1_init(conn);
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asn1 = asn1_init(conn, ASN1_MAX_TREE_DEPTH);
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if (asn1 == NULL) {
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TALLOC_FREE(msg);
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ldap_error_handler(conn, NT_STATUS_NO_MEMORY);
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@ -32,7 +32,7 @@ static bool decode_server_sort_response(void *mem_ctx, DATA_BLOB in, void *_out)
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{
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void **out = (void **)_out;
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DATA_BLOB attr;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_sort_resp_control *lsrc;
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if (!data) return false;
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@ -79,7 +79,7 @@ static bool decode_server_sort_request(void *mem_ctx, DATA_BLOB in, void *_out)
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void **out = (void **)_out;
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DATA_BLOB attr;
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DATA_BLOB rule;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_server_sort_control **lssc;
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int num;
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@ -166,7 +166,7 @@ static bool decode_extended_dn_request(void *mem_ctx, DATA_BLOB in, void *_out)
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return true;
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}
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data = asn1_init(mem_ctx);
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data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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if (!data) return false;
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if (!asn1_load(data, in)) {
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@ -198,7 +198,7 @@ static bool decode_extended_dn_request(void *mem_ctx, DATA_BLOB in, void *_out)
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static bool decode_sd_flags_request(void *mem_ctx, DATA_BLOB in, void *_out)
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{
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void **out = (void **)_out;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_sd_flags_control *lsdfc;
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if (!data) return false;
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@ -232,7 +232,7 @@ static bool decode_sd_flags_request(void *mem_ctx, DATA_BLOB in, void *_out)
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static bool decode_search_options_request(void *mem_ctx, DATA_BLOB in, void *_out)
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{
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void **out = (void **)_out;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_search_options_control *lsoc;
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if (!data) return false;
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@ -267,7 +267,7 @@ static bool decode_paged_results_request(void *mem_ctx, DATA_BLOB in, void *_out
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{
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void **out = (void **)_out;
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DATA_BLOB cookie;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_paged_control *lprc;
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if (!data) return false;
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@ -316,7 +316,7 @@ static bool decode_dirsync_request(void *mem_ctx, DATA_BLOB in, void *_out)
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{
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void **out = (void **)_out;
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DATA_BLOB cookie;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_dirsync_control *ldc;
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if (!data) return false;
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@ -372,7 +372,7 @@ static bool decode_asq_control(void *mem_ctx, DATA_BLOB in, void *_out)
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{
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void **out = (void **)_out;
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DATA_BLOB source_attribute;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_asq_control *lac;
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if (!data) return false;
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@ -433,7 +433,7 @@ static bool decode_verify_name_request(void *mem_ctx, DATA_BLOB in, void *_out)
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{
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void **out = (void **)_out;
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DATA_BLOB name;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_verify_name_control *lvnc;
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int len;
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@ -485,7 +485,7 @@ static bool decode_verify_name_request(void *mem_ctx, DATA_BLOB in, void *_out)
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static bool encode_verify_name_request(void *mem_ctx, void *in, DATA_BLOB *out)
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{
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struct ldb_verify_name_control *lvnc = talloc_get_type(in, struct ldb_verify_name_control);
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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DATA_BLOB gc_utf16;
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if (!data) return false;
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@ -528,7 +528,7 @@ static bool decode_vlv_request(void *mem_ctx, DATA_BLOB in, void *_out)
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{
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void **out = (void **)_out;
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DATA_BLOB assertion_value, context_id;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_vlv_req_control *lvrc;
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if (!data) return false;
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@ -626,7 +626,7 @@ static bool decode_vlv_response(void *mem_ctx, DATA_BLOB in, void *_out)
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{
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void **out = (void **)_out;
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DATA_BLOB context_id;
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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struct ldb_vlv_resp_control *lvrc;
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if (!data) return false;
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@ -682,7 +682,7 @@ static bool decode_vlv_response(void *mem_ctx, DATA_BLOB in, void *_out)
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static bool encode_server_sort_response(void *mem_ctx, void *in, DATA_BLOB *out)
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{
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struct ldb_sort_resp_control *lsrc = talloc_get_type(in, struct ldb_sort_resp_control);
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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if (!data) return false;
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@ -716,7 +716,7 @@ static bool encode_server_sort_response(void *mem_ctx, void *in, DATA_BLOB *out)
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static bool encode_server_sort_request(void *mem_ctx, void *in, DATA_BLOB *out)
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{
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struct ldb_server_sort_control **lssc = talloc_get_type(in, struct ldb_server_sort_control *);
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struct asn1_data *data = asn1_init(mem_ctx);
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struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
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int num;
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if (!data) return false;
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@ -782,7 +782,7 @@ static bool encode_extended_dn_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
return true;
|
||||
}
|
||||
|
||||
data = asn1_init(mem_ctx);
|
||||
data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
|
||||
if (!data) return false;
|
||||
|
||||
@ -810,7 +810,7 @@ static bool encode_extended_dn_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
static bool encode_sd_flags_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
{
|
||||
struct ldb_sd_flags_control *lsdfc = talloc_get_type(in, struct ldb_sd_flags_control);
|
||||
struct asn1_data *data = asn1_init(mem_ctx);
|
||||
struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
|
||||
if (!data) return false;
|
||||
|
||||
@ -838,7 +838,7 @@ static bool encode_sd_flags_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
static bool encode_search_options_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
{
|
||||
struct ldb_search_options_control *lsoc = talloc_get_type(in, struct ldb_search_options_control);
|
||||
struct asn1_data *data = asn1_init(mem_ctx);
|
||||
struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
|
||||
if (!data) return false;
|
||||
|
||||
@ -866,7 +866,7 @@ static bool encode_search_options_request(void *mem_ctx, void *in, DATA_BLOB *ou
|
||||
static bool encode_paged_results_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
{
|
||||
struct ldb_paged_control *lprc = talloc_get_type(in, struct ldb_paged_control);
|
||||
struct asn1_data *data = asn1_init(mem_ctx);
|
||||
struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
|
||||
if (!data) return false;
|
||||
|
||||
@ -901,7 +901,7 @@ static bool encode_paged_results_request(void *mem_ctx, void *in, DATA_BLOB *out
|
||||
static bool encode_asq_control(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
{
|
||||
struct ldb_asq_control *lac = talloc_get_type(in, struct ldb_asq_control);
|
||||
struct asn1_data *data = asn1_init(mem_ctx);
|
||||
struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
|
||||
if (!data) return false;
|
||||
|
||||
@ -936,7 +936,7 @@ static bool encode_asq_control(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
static bool encode_dirsync_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
{
|
||||
struct ldb_dirsync_control *ldc = talloc_get_type(in, struct ldb_dirsync_control);
|
||||
struct asn1_data *data = asn1_init(mem_ctx);
|
||||
struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
|
||||
if (!data) return false;
|
||||
|
||||
@ -972,7 +972,7 @@ static bool encode_dirsync_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
static bool encode_vlv_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
{
|
||||
struct ldb_vlv_req_control *lvrc = talloc_get_type(in, struct ldb_vlv_req_control);
|
||||
struct asn1_data *data = asn1_init(mem_ctx);
|
||||
struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
|
||||
if (!data) return false;
|
||||
|
||||
@ -1040,7 +1040,7 @@ static bool encode_vlv_request(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
static bool encode_vlv_response(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
{
|
||||
struct ldb_vlv_resp_control *lvrc = talloc_get_type(in, struct ldb_vlv_resp_control);
|
||||
struct asn1_data *data = asn1_init(mem_ctx);
|
||||
struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
|
||||
if (!data) return false;
|
||||
|
||||
@ -1083,7 +1083,7 @@ static bool encode_openldap_dereference(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
{
|
||||
struct dsdb_openldap_dereference_control *control = talloc_get_type(in, struct dsdb_openldap_dereference_control);
|
||||
int i,j;
|
||||
struct asn1_data *data = asn1_init(mem_ctx);
|
||||
struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
|
||||
if (!data) return false;
|
||||
|
||||
@ -1132,7 +1132,7 @@ static bool encode_openldap_dereference(void *mem_ctx, void *in, DATA_BLOB *out)
|
||||
static bool decode_openldap_dereference(void *mem_ctx, DATA_BLOB in, void *_out)
|
||||
{
|
||||
void **out = (void **)_out;
|
||||
struct asn1_data *data = asn1_init(mem_ctx);
|
||||
struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
|
||||
struct dsdb_openldap_dereference_result_control *control;
|
||||
struct dsdb_openldap_dereference_result **r = NULL;
|
||||
int i = 0;
|
||||
|
Loading…
Reference in New Issue
Block a user