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add issuer validation for JWT access tokens
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when configured through OAuth2Verify metadata; closes #44; thanks
@chris-crunchr

Signed-off-by: Hans Zandbelt <[email protected]>
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zandbelt committed Apr 19, 2023
1 parent 20fff96 commit c6226b5
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Showing 5 changed files with 69 additions and 31 deletions.
3 changes: 3 additions & 0 deletions ChangeLog
Original file line number Diff line number Diff line change
@@ -1,3 +1,6 @@
04/19/2023
- add issuer validation for JWT access tokens when configured through OAuth2Verify metadata; closes #44; thanks @chris-crunchr

04/14/2023
- add support for resolving provider metadata from a Discovery endpoint URL; see https://github.com/OpenIDC/ngx_openidc_module/issues/18
- bump to 1.5.1dev
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16 changes: 10 additions & 6 deletions src/jose.c
Original file line number Diff line number Diff line change
Expand Up @@ -862,21 +862,24 @@ _OAUTH2_CFG_CTX_INIT_START(oauth2_jose_jwt_verify_ctx)
ctx->exp_validate = OAUTH2_CFG_UINT_UNSET;
ctx->iat_validate = OAUTH2_CFG_UINT_UNSET;
ctx->iss_validate = OAUTH2_CFG_UINT_UNSET;
ctx->issuer = NULL;
ctx->iat_slack_after = OAUTH2_CFG_UINT_UNSET;
ctx->iat_slack_before = OAUTH2_CFG_UINT_UNSET;
ctx->jwks_provider = NULL;
_OAUTH2_CFG_CTX_INIT_END

_OAUTH2_CFG_CTX_CLONE_START(oauth2_jose_jwt_verify_ctx)
dst->exp_validate = src->exp_validate;
dst->iss_validate = src->iss_validate;
dst->issuer = oauth2_strdup(src->issuer);
dst->iat_slack_after = src->iat_slack_after;
dst->iat_slack_before = src->iat_slack_before;
dst->iat_validate = src->iat_validate;
dst->iss_validate = src->iss_validate;
dst->jwks_provider = _oauth2_jose_jwks_provider_clone(log, src->jwks_provider);
_OAUTH2_CFG_CTX_CLONE_END

_OAUTH2_CFG_CTX_FREE_START(oauth2_jose_jwt_verify_ctx)
if (ctx->issuer)
oauth2_mem_free(ctx->issuer);
if (ctx->jwks_provider)
_oauth2_jose_jwks_provider_free(log, ctx->jwks_provider);
_OAUTH2_CFG_CTX_FREE_END
Expand Down Expand Up @@ -1207,14 +1210,15 @@ bool oauth2_jose_jwt_validate_iat(oauth2_log_t *log, const json_t *json_payload,
static bool
_oauth2_jose_jwt_payload_validate(oauth2_log_t *log,
oauth2_jose_jwt_verify_ctx_t *jwt_verify_ctx,
const json_t *json_payload, const char *iss)
const json_t *json_payload)
{
bool rc = false;

oauth2_debug(log, "enter");

if (_oauth2_jose_jwt_validate_iss(
log, json_payload, iss, jwt_verify_ctx->iss_validate) == false)
log, json_payload, jwt_verify_ctx->issuer,
jwt_verify_ctx->iss_validate) == false)
goto end;

if (_oauth2_jose_jwt_validate_exp(
Expand Down Expand Up @@ -1332,8 +1336,8 @@ bool oauth2_jose_jwt_verify(oauth2_log_t *log,
}

if (jwt_verify_ctx) {
if (_oauth2_jose_jwt_payload_validate(
log, jwt_verify_ctx, *json_payload, NULL) == false) {
if (_oauth2_jose_jwt_payload_validate(log, jwt_verify_ctx,
*json_payload) == false) {
json_decref(*json_payload);
*json_payload = NULL;
oauth2_mem_free(*s_payload);
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1 change: 1 addition & 0 deletions src/jose_int.h
Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,7 @@ typedef struct oauth2_jose_jwks_provider_t {

_OAUTH2_CFG_CTX_TYPE_START(oauth2_jose_jwt_verify_ctx)
oauth2_jose_jwks_provider_t *jwks_provider;
char *issuer;
oauth2_jose_jwt_validate_claim_t iss_validate;
oauth2_jose_jwt_validate_claim_t exp_validate;
oauth2_jose_jwt_validate_claim_t iat_validate;
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19 changes: 17 additions & 2 deletions src/oauth2.c
Original file line number Diff line number Diff line change
Expand Up @@ -519,8 +519,8 @@ static bool _oauth2_metadata_verify_callback(oauth2_log_t *log,
oauth2_metadata_ctx_t *ptr = NULL;
bool refresh = false;
char *response = NULL;
json_t *json_metadata = NULL, *json_jwks_uri = NULL,
*json_introspection_endpoint;
json_t *json_metadata = NULL, *json_issuer = NULL,
*json_jwks_uri = NULL, *json_introspection_endpoint;
oauth2_jose_jwt_verify_ctx_t *jwks_uri_verify = NULL;
oauth2_introspect_ctx_t *introspect_ctx = NULL;
const char *jwks_uri = NULL, *introspection_uri = NULL;
Expand All @@ -540,6 +540,21 @@ static bool _oauth2_metadata_verify_callback(oauth2_log_t *log,
if (oauth2_json_decode_object(log, response, &json_metadata) == false)
goto end;

json_issuer = json_object_get(json_metadata, "issuer");
if (json_issuer) {
if (json_is_string(json_issuer)) {
ptr->jwks_uri_verify->issuer =
oauth2_strdup(json_string_value(json_issuer));
} else {
oauth2_error(log, "\"issuer\" value is not a string");
goto end;
}
} else {
oauth2_error(log,
"required \"issuer\" value not found in metadata");
goto end;
}

peek = oauth2_jose_jwt_header_peek(log, token, NULL);
if (peek) {
oauth2_debug(log, "JWT token: header=%s", peek);
Expand Down
61 changes: 38 additions & 23 deletions test/check_oauth2.c
Original file line number Diff line number Diff line change
Expand Up @@ -503,6 +503,7 @@ static char metadata[512];
static char *get_metadata_json()
{
static char *format = "{"
"\"issuer\": \"https://example.com\","
"\"jwks_uri\": \"%s%s\","
"\"introspection_endpoint\": \"%s%s\""
"}";
Expand Down Expand Up @@ -572,7 +573,7 @@ static char *oauth2_check_oauth2_serve_post(const char *request)

error:

rv = oauth2_strdup("problem");
rv = oauth2_strdup("{ \"error\": \"problem\" }");

end:

Expand Down Expand Up @@ -1009,7 +1010,7 @@ START_TEST(test_oauth2_verify_token_metadata)

rv = oauth2_cfg_token_verify_add_options(
_log, &verify, "metadata", url,
"&verify.exp=skip&&introspect.params=key2%3Dtwo");
"verify.exp=skip&verify.iss=required&introspect.params=key2%3Dtwo");
ck_assert_ptr_eq(rv, NULL);

// reference token
Expand Down Expand Up @@ -1044,9 +1045,22 @@ START_TEST(test_oauth2_verify_token_metadata)
"DGng-7rgrobhOiaAgBAwLhq9fvTtM2MWNmWXmUCymq3nGqG_d_t5i_"
"x7Zf28T3ejzEX-ETefpTENX7BJ57-vQbAeECRTIo_LhzKTaDkiZWpf6JgraQg";

rc = oauth2_token_verify(_log, NULL, verify, jwt, &json_payload);
ck_assert_int_eq(rc, false);
json_decref(json_payload);

oauth2_cfg_token_verify_free(_log, verify);
verify = NULL;

rv = oauth2_cfg_token_verify_add_options(
_log, &verify, "metadata", url,
"verify.exp=skip&verify.iss=optional&introspect.params=key2%3Dtwo");
ck_assert_ptr_eq(rv, NULL);

rc = oauth2_token_verify(_log, NULL, verify, jwt, &json_payload);
ck_assert_int_eq(rc, true);
json_decref(json_payload);

// get it from the cache
rc = oauth2_token_verify(_log, NULL, verify, jwt, &json_payload);
ck_assert_int_eq(rc, true);
Expand Down Expand Up @@ -1131,28 +1145,29 @@ Suite *oauth2_check_oauth2_suite()
oauth2_check_oauth2_serve_post);

tcase_add_checked_fixture(c, setup, teardown);

tcase_add_test(c, test_oauth2_auth_client_secret_basic);
tcase_add_test(c, test_oauth2_auth_client_secret_post);
tcase_add_test(c, test_oauth2_auth_client_secret_jwt);
tcase_add_test(c, test_oauth2_auth_private_key_jwt);
tcase_add_test(c, test_oauth2_auth_client_cert);
tcase_add_test(c, test_oauth2_auth_http_basic);
tcase_add_test(c, test_oauth2_auth_none);
tcase_add_test(c, test_oauth2_verify_clone);
tcase_add_test(c, test_oauth2_verify_jwks_uri);
tcase_add_test(c, test_oauth2_verify_jwk);
tcase_add_test(c, test_oauth2_verify_jwk_dpop);
tcase_add_test(c, test_oauth2_verify_eckey_uri);
tcase_add_test(c, test_oauth2_verify_token_introspection);
tcase_add_test(c, test_oauth2_verify_token_plain);
tcase_add_test(c, test_oauth2_verify_token_base64);
tcase_add_test(c, test_oauth2_verify_token_base64url);
tcase_add_test(c, test_oauth2_verify_token_hex);
tcase_add_test(c, test_oauth2_verify_token_pem);
tcase_add_test(c, test_oauth2_verify_token_pubkey);
/*
tcase_add_test(c, test_oauth2_auth_client_secret_basic);
tcase_add_test(c, test_oauth2_auth_client_secret_post);
tcase_add_test(c, test_oauth2_auth_client_secret_jwt);
tcase_add_test(c, test_oauth2_auth_private_key_jwt);
tcase_add_test(c, test_oauth2_auth_client_cert);
tcase_add_test(c, test_oauth2_auth_http_basic);
tcase_add_test(c, test_oauth2_auth_none);
tcase_add_test(c, test_oauth2_verify_clone);
tcase_add_test(c, test_oauth2_verify_jwks_uri);
tcase_add_test(c, test_oauth2_verify_jwk);
tcase_add_test(c, test_oauth2_verify_jwk_dpop);
tcase_add_test(c, test_oauth2_verify_eckey_uri);
tcase_add_test(c, test_oauth2_verify_token_introspection);
tcase_add_test(c, test_oauth2_verify_token_plain);
tcase_add_test(c, test_oauth2_verify_token_base64);
tcase_add_test(c, test_oauth2_verify_token_base64url);
tcase_add_test(c, test_oauth2_verify_token_hex);
tcase_add_test(c, test_oauth2_verify_token_pem);
tcase_add_test(c, test_oauth2_verify_token_pubkey);
*/
tcase_add_test(c, test_oauth2_verify_token_metadata);
tcase_add_test(c, test_oauth2_verify_jwk_mtls);
// tcase_add_test(c, test_oauth2_verify_jwk_mtls);

suite_add_tcase(s, c);

Expand Down

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