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Fix some onion helpers

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Fix add_onion_helper_clientauth() and add_onion_helper_keyarg() to
explicitly call the appropriate control reply abstractions instead of
allocating a string to pass to their callers.

Part of ticket 30889.
This commit is contained in:
Taylor Yu 2019-06-25 10:34:53 -05:00
parent e5e6953be7
commit 5faf54970d
3 changed files with 100 additions and 86 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
src/feature/control/control_cmd.c
View File

@ -1743,16 +1743,10 @@ handle_control_add_onion(control_connection_t *conn,
goto out;
} else if (!strcasecmp(arg->key, "ClientAuth")) {
char *err_msg = NULL;
int created = 0;
rend_authorized_client_t *client =
add_onion_helper_clientauth(arg->value,
&created, &err_msg);
add_onion_helper_clientauth(arg->value, &created, conn);
if (!client) {
if (err_msg) {
connection_write_str_to_buf(err_msg, conn);
tor_free(err_msg);
}
goto out;
}
@ -1817,19 +1811,13 @@ handle_control_add_onion(control_connection_t *conn,
add_onion_secret_key_t pk = { NULL };
const char *key_new_alg = NULL;
char *key_new_blob = NULL;
char *err_msg = NULL;
const char *onionkey = smartlist_get(args->args, 0);
if (add_onion_helper_keyarg(onionkey, discard_pk,
&key_new_alg, &key_new_blob, &pk, &hs_version,
&err_msg) < 0) {
if (err_msg) {
connection_write_str_to_buf(err_msg, conn);
tor_free(err_msg);
}
conn) < 0) {
goto out;
}
tor_assert(!err_msg);
/* Hidden service version 3 don't have client authentication support so if
* ClientAuth was given, send back an error. */
@ -1929,27 +1917,30 @@ handle_control_add_onion(control_connection_t *conn,
* ADD_ONION command. Return a new crypto_pk_t and if a new key was generated
* and the private key not discarded, the algorithm and serialized private key,
* or NULL and an optional control protocol error message on failure. The
* caller is responsible for freeing the returned key_new_blob and err_msg.
* caller is responsible for freeing the returned key_new_blob.
*
* Note: The error messages returned are deliberately vague to avoid echoing
* key material.
*
* Note: conn is only used for writing control replies. For testing
* purposes, it can be NULL if control_write_reply() is appropriately
* mocked.
*/
STATIC int
add_onion_helper_keyarg(const char *arg, int discard_pk,
const char **key_new_alg_out, char **key_new_blob_out,
add_onion_secret_key_t *decoded_key, int *hs_version,
char **err_msg_out)
control_connection_t *conn)
{
smartlist_t *key_args = smartlist_new();
crypto_pk_t *pk = NULL;
const char *key_new_alg = NULL;
char *key_new_blob = NULL;
char *err_msg = NULL;
int ret = -1;
smartlist_split_string(key_args, arg, ":", SPLIT_IGNORE_BLANK, 0);
if (smartlist_len(key_args) != 2) {
err_msg = tor_strdup("512 Invalid key type/blob\r\n");
control_write_endreply(conn, 512, "Invalid key type/blob");
goto err;
}
@ -1966,12 +1957,12 @@ add_onion_helper_keyarg(const char *arg, int discard_pk,
/* "RSA:<Base64 Blob>" - Loading a pre-existing RSA1024 key. */
pk = crypto_pk_base64_decode_private(key_blob, strlen(key_blob));
if (!pk) {
err_msg = tor_strdup("512 Failed to decode RSA key\r\n");
control_write_endreply(conn, 512, "Failed to decode RSA key");
goto err;
}
if (crypto_pk_num_bits(pk) != PK_BYTES*8) {
crypto_pk_free(pk);
err_msg = tor_strdup("512 Invalid RSA key size\r\n");
control_write_endreply(conn, 512, "Invalid RSA key size");
goto err;
}
decoded_key->v2 = pk;
@ -1982,7 +1973,7 @@ add_onion_helper_keyarg(const char *arg, int discard_pk,
if (base64_decode((char *) sk->seckey, sizeof(sk->seckey), key_blob,
strlen(key_blob)) != sizeof(sk->seckey)) {
tor_free(sk);
err_msg = tor_strdup("512 Failed to decode ED25519-V3 key\r\n");
control_write_endreply(conn, 512, "Failed to decode ED25519-V3 key");
goto err;
}
decoded_key->v3 = sk;
@ -1994,15 +1985,15 @@ add_onion_helper_keyarg(const char *arg, int discard_pk,
/* "RSA1024", RSA 1024 bit, also currently "BEST" by default. */
pk = crypto_pk_new();
if (crypto_pk_generate_key(pk)) {
tor_asprintf(&err_msg, "551 Failed to generate %s key\r\n",
key_type_rsa1024);
control_printf_endreply(conn, 551, "Failed to generate %s key",
key_type_rsa1024);
goto err;
}
if (!discard_pk) {
if (crypto_pk_base64_encode_private(pk, &key_new_blob)) {
crypto_pk_free(pk);
tor_asprintf(&err_msg, "551 Failed to encode %s key\r\n",
key_type_rsa1024);
control_printf_endreply(conn, 551, "Failed to encode %s key",
key_type_rsa1024);
goto err;
}
key_new_alg = key_type_rsa1024;
@ -2013,8 +2004,8 @@ add_onion_helper_keyarg(const char *arg, int discard_pk,
ed25519_secret_key_t *sk = tor_malloc_zero(sizeof(*sk));
if (ed25519_secret_key_generate(sk, 1) < 0) {
tor_free(sk);
tor_asprintf(&err_msg, "551 Failed to generate %s key\r\n",
key_type_ed25519_v3);
control_printf_endreply(conn, 551, "Failed to generate %s key",
key_type_ed25519_v3);
goto err;
}
if (!discard_pk) {
@ -2024,8 +2015,8 @@ add_onion_helper_keyarg(const char *arg, int discard_pk,
sizeof(sk->seckey), 0) != (len - 1)) {
tor_free(sk);
tor_free(key_new_blob);
tor_asprintf(&err_msg, "551 Failed to encode %s key\r\n",
key_type_ed25519_v3);
control_printf_endreply(conn, 551, "Failed to encode %s key",
key_type_ed25519_v3);
goto err;
}
key_new_alg = key_type_ed25519_v3;
@ -2033,11 +2024,11 @@ add_onion_helper_keyarg(const char *arg, int discard_pk,
decoded_key->v3 = sk;
*hs_version = HS_VERSION_THREE;
} else {
err_msg = tor_strdup("513 Invalid key type\r\n");
control_write_endreply(conn, 513, "Invalid key type");
goto err;
}
} else {
err_msg = tor_strdup("513 Invalid key type\r\n");
control_write_endreply(conn, 513, "Invalid key type");
goto err;
}
@ -2051,11 +2042,6 @@ add_onion_helper_keyarg(const char *arg, int discard_pk,
});
smartlist_free(key_args);
if (err_msg_out) {
*err_msg_out = err_msg;
} else {
tor_free(err_msg);
}
*key_new_alg_out = key_new_alg;
*key_new_blob_out = key_new_blob;
@ -2065,27 +2051,30 @@ add_onion_helper_keyarg(const char *arg, int discard_pk,
/** Helper function to handle parsing a ClientAuth argument to the
* ADD_ONION command. Return a new rend_authorized_client_t, or NULL
* and an optional control protocol error message on failure. The
* caller is responsible for freeing the returned auth_client and err_msg.
* caller is responsible for freeing the returned auth_client.
*
* If 'created' is specified, it will be set to 1 when a new cookie has
* been generated.
*
* Note: conn is only used for writing control replies. For testing
* purposes, it can be NULL if control_write_reply() is appropriately
* mocked.
*/
STATIC rend_authorized_client_t *
add_onion_helper_clientauth(const char *arg, int *created, char **err_msg)
add_onion_helper_clientauth(const char *arg, int *created,
control_connection_t *conn)
{
int ok = 0;
tor_assert(arg);
tor_assert(created);
tor_assert(err_msg);
*err_msg = NULL;
smartlist_t *auth_args = smartlist_new();
rend_authorized_client_t *client =
tor_malloc_zero(sizeof(rend_authorized_client_t));
smartlist_split_string(auth_args, arg, ":", 0, 0);
if (smartlist_len(auth_args) < 1 || smartlist_len(auth_args) > 2) {
*err_msg = tor_strdup("512 Invalid ClientAuth syntax\r\n");
control_write_endreply(conn, 512, "Invalid ClientAuth syntax");
goto err;
}
client->client_name = tor_strdup(smartlist_get(auth_args, 0));
@ -2095,7 +2084,7 @@ add_onion_helper_clientauth(const char *arg, int *created, char **err_msg)
client->descriptor_cookie,
NULL, &decode_err_msg) < 0) {
tor_assert(decode_err_msg);
tor_asprintf(err_msg, "512 %s\r\n", decode_err_msg);
control_write_endreply(conn, 512, decode_err_msg);
tor_free(decode_err_msg);
goto err;
}
@ -2106,7 +2095,7 @@ add_onion_helper_clientauth(const char *arg, int *created, char **err_msg)
}
if (!rend_valid_client_name(client->client_name)) {
*err_msg = tor_strdup("512 Invalid name in ClientAuth\r\n");
control_write_endreply(conn, 512, "Invalid name in ClientAuth");
goto err;
}

5
src/feature/control/control_cmd.h
View File

@ -91,10 +91,11 @@ STATIC int add_onion_helper_keyarg(const char *arg, int discard_pk,
const char **key_new_alg_out,
char **key_new_blob_out,
add_onion_secret_key_t *decoded_key,
int *hs_version, char **err_msg_out);
int *hs_version,
control_connection_t *conn);
STATIC rend_authorized_client_t *add_onion_helper_clientauth(const char *arg,
int *created, char **err_msg_out);
int *created, control_connection_t *conn);
STATIC control_cmd_args_t *control_cmd_parse_args(
const char *command,

106
src/test/test_controller.c
View File

@ -9,6 +9,7 @@
#include "feature/control/control.h"
#include "feature/control/control_cmd.h"
#include "feature/control/control_getinfo.h"
#include "feature/control/control_proto.h"
#include "feature/client/entrynodes.h"
#include "feature/hs/hs_common.h"
#include "feature/nodelist/networkstatus.h"
@ -201,42 +202,58 @@ static const control_cmd_syntax_t one_arg_kwargs_syntax = {
static const parse_test_params_t parse_one_arg_kwargs_params =
TESTPARAMS( one_arg_kwargs_syntax, one_arg_kwargs_tests );
static char *reply_str = NULL;
/* Mock for control_write_reply that copies the string for inspection
* by tests */
static void
mock_control_write_reply(control_connection_t *conn, int code, int c,
const char *s)
{
(void)conn;
(void)code;
(void)c;
tor_free(reply_str);
reply_str = tor_strdup(s);
}
static void
test_add_onion_helper_keyarg_v3(void *arg)
{
int ret, hs_version;
add_onion_secret_key_t pk;
char *key_new_blob = NULL;
char *err_msg = NULL;
const char *key_new_alg = NULL;
(void) arg;
MOCK(control_write_reply, mock_control_write_reply);
memset(&pk, 0, sizeof(pk));
/* Test explicit ED25519-V3 key generation. */
tor_free(reply_str);
ret = add_onion_helper_keyarg("NEW:ED25519-V3", 0, &key_new_alg,
&key_new_blob, &pk, &hs_version,
&err_msg);
NULL);
tt_int_op(ret, OP_EQ, 0);
tt_int_op(hs_version, OP_EQ, HS_VERSION_THREE);
tt_assert(pk.v3);
tt_str_op(key_new_alg, OP_EQ, "ED25519-V3");
tt_assert(key_new_blob);
tt_ptr_op(err_msg, OP_EQ, NULL);
tt_ptr_op(reply_str, OP_EQ, NULL);
tor_free(pk.v3); pk.v3 = NULL;
tor_free(key_new_blob);
/* Test discarding the private key. */
tor_free(reply_str);
ret = add_onion_helper_keyarg("NEW:ED25519-V3", 1, &key_new_alg,
&key_new_blob, &pk, &hs_version,
&err_msg);
NULL);
tt_int_op(ret, OP_EQ, 0);
tt_int_op(hs_version, OP_EQ, HS_VERSION_THREE);
tt_assert(pk.v3);
tt_ptr_op(key_new_alg, OP_EQ, NULL);
tt_ptr_op(key_new_blob, OP_EQ, NULL);
tt_ptr_op(err_msg, OP_EQ, NULL);
tt_ptr_op(reply_str, OP_EQ, NULL);
tor_free(pk.v3); pk.v3 = NULL;
tor_free(key_new_blob);
@ -256,9 +273,10 @@ test_add_onion_helper_keyarg_v3(void *arg)
tor_asprintf(&key_blob, "ED25519-V3:%s", base64_sk);
tt_assert(key_blob);
tor_free(reply_str);
ret = add_onion_helper_keyarg(key_blob, 1, &key_new_alg,
&key_new_blob, &pk, &hs_version,
&err_msg);
NULL);
tor_free(key_blob);
tt_int_op(ret, OP_EQ, 0);
tt_int_op(hs_version, OP_EQ, HS_VERSION_THREE);
@ -266,7 +284,7 @@ test_add_onion_helper_keyarg_v3(void *arg)
tt_mem_op(pk.v3, OP_EQ, hex_sk, 64);
tt_ptr_op(key_new_alg, OP_EQ, NULL);
tt_ptr_op(key_new_blob, OP_EQ, NULL);
tt_ptr_op(err_msg, OP_EQ, NULL);
tt_ptr_op(reply_str, OP_EQ, NULL);
tor_free(pk.v3); pk.v3 = NULL;
tor_free(key_new_blob);
}
@ -274,7 +292,8 @@ test_add_onion_helper_keyarg_v3(void *arg)
done:
tor_free(pk.v3);
tor_free(key_new_blob);
tor_free(err_msg);
tor_free(reply_str);
UNMOCK(control_write_reply);
}
static void
@ -285,72 +304,73 @@ test_add_onion_helper_keyarg_v2(void *arg)
crypto_pk_t *pk1 = NULL;
const char *key_new_alg = NULL;
char *key_new_blob = NULL;
char *err_msg = NULL;
char *encoded = NULL;
char *arg_str = NULL;
(void) arg;
MOCK(control_write_reply, mock_control_write_reply);
memset(&pk, 0, sizeof(pk));
/* Test explicit RSA1024 key generation. */
tor_free(reply_str);
ret = add_onion_helper_keyarg("NEW:RSA1024", 0, &key_new_alg, &key_new_blob,
&pk, &hs_version, &err_msg);
&pk, &hs_version, NULL);
tt_int_op(ret, OP_EQ, 0);
tt_int_op(hs_version, OP_EQ, HS_VERSION_TWO);
tt_assert(pk.v2);
tt_str_op(key_new_alg, OP_EQ, "RSA1024");
tt_assert(key_new_blob);
tt_ptr_op(err_msg, OP_EQ, NULL);
tt_ptr_op(reply_str, OP_EQ, NULL);
/* Test "BEST" key generation (Assumes BEST = RSA1024). */
crypto_pk_free(pk.v2); pk.v2 = NULL;
tor_free(key_new_blob);
ret = add_onion_helper_keyarg("NEW:BEST", 0, &key_new_alg, &key_new_blob,
&pk, &hs_version, &err_msg);
&pk, &hs_version, NULL);
tt_int_op(ret, OP_EQ, 0);
tt_int_op(hs_version, OP_EQ, HS_VERSION_TWO);
tt_assert(pk.v2);
tt_str_op(key_new_alg, OP_EQ, "RSA1024");
tt_assert(key_new_blob);
tt_ptr_op(err_msg, OP_EQ, NULL);
tt_ptr_op(reply_str, OP_EQ, NULL);
/* Test discarding the private key. */
crypto_pk_free(pk.v2); pk.v2 = NULL;
tor_free(key_new_blob);
ret = add_onion_helper_keyarg("NEW:BEST", 1, &key_new_alg, &key_new_blob,
&pk, &hs_version, &err_msg);
&pk, &hs_version, NULL);
tt_int_op(ret, OP_EQ, 0);
tt_int_op(hs_version, OP_EQ, HS_VERSION_TWO);
tt_assert(pk.v2);
tt_ptr_op(key_new_alg, OP_EQ, NULL);
tt_ptr_op(key_new_blob, OP_EQ, NULL);
tt_ptr_op(err_msg, OP_EQ, NULL);
tt_ptr_op(reply_str, OP_EQ, NULL);
/* Test generating a invalid key type. */
crypto_pk_free(pk.v2); pk.v2 = NULL;
ret = add_onion_helper_keyarg("NEW:RSA512", 0, &key_new_alg, &key_new_blob,
&pk, &hs_version, &err_msg);
&pk, &hs_version, NULL);
tt_int_op(ret, OP_EQ, -1);
tt_int_op(hs_version, OP_EQ, HS_VERSION_TWO);
tt_assert(!pk.v2);
tt_ptr_op(key_new_alg, OP_EQ, NULL);
tt_ptr_op(key_new_blob, OP_EQ, NULL);
tt_assert(err_msg);
tt_assert(reply_str);
/* Test loading a RSA1024 key. */
tor_free(err_msg);
tor_free(reply_str);
pk1 = pk_generate(0);
tt_int_op(0, OP_EQ, crypto_pk_base64_encode_private(pk1, &encoded));
tor_asprintf(&arg_str, "RSA1024:%s", encoded);
ret = add_onion_helper_keyarg(arg_str, 0, &key_new_alg, &key_new_blob,
&pk, &hs_version, &err_msg);
&pk, &hs_version, NULL);
tt_int_op(ret, OP_EQ, 0);
tt_int_op(hs_version, OP_EQ, HS_VERSION_TWO);
tt_assert(pk.v2);
tt_ptr_op(key_new_alg, OP_EQ, NULL);
tt_ptr_op(key_new_blob, OP_EQ, NULL);
tt_ptr_op(err_msg, OP_EQ, NULL);
tt_ptr_op(reply_str, OP_EQ, NULL);
tt_int_op(crypto_pk_cmp_keys(pk1, pk.v2), OP_EQ, 0);
/* Test loading a invalid key type. */
@ -359,36 +379,37 @@ test_add_onion_helper_keyarg_v2(void *arg)
crypto_pk_free(pk.v2); pk.v2 = NULL;
tor_asprintf(&arg_str, "RSA512:%s", encoded);
ret = add_onion_helper_keyarg(arg_str, 0, &key_new_alg, &key_new_blob,
&pk, &hs_version, &err_msg);
&pk, &hs_version, NULL);
tt_int_op(ret, OP_EQ, -1);
tt_int_op(hs_version, OP_EQ, HS_VERSION_TWO);
tt_assert(!pk.v2);
tt_ptr_op(key_new_alg, OP_EQ, NULL);
tt_ptr_op(key_new_blob, OP_EQ, NULL);
tt_assert(err_msg);
tt_assert(reply_str);
/* Test loading a invalid key. */
tor_free(arg_str);
crypto_pk_free(pk.v2); pk.v2 = NULL;
tor_free(err_msg);
tor_free(reply_str);
encoded[strlen(encoded)/2] = '\0';
tor_asprintf(&arg_str, "RSA1024:%s", encoded);
ret = add_onion_helper_keyarg(arg_str, 0, &key_new_alg, &key_new_blob,
&pk, &hs_version, &err_msg);
&pk, &hs_version, NULL);
tt_int_op(ret, OP_EQ, -1);
tt_int_op(hs_version, OP_EQ, HS_VERSION_TWO);
tt_assert(!pk.v2);
tt_ptr_op(key_new_alg, OP_EQ, NULL);
tt_ptr_op(key_new_blob, OP_EQ, NULL);
tt_assert(err_msg);
tt_assert(reply_str);
done:
crypto_pk_free(pk1);
crypto_pk_free(pk.v2);
tor_free(key_new_blob);
tor_free(err_msg);
tor_free(reply_str);
tor_free(encoded);
tor_free(arg_str);
UNMOCK(control_write_reply);
}
static void
@ -542,49 +563,52 @@ static void
test_add_onion_helper_clientauth(void *arg)
{
rend_authorized_client_t *client = NULL;
char *err_msg = NULL;
int created = 0;
(void)arg;
MOCK(control_write_reply, mock_control_write_reply);
/* Test "ClientName" only. */
client = add_onion_helper_clientauth("alice", &created, &err_msg);
tor_free(reply_str);
client = add_onion_helper_clientauth("alice", &created, NULL);
tt_assert(client);
tt_assert(created);
tt_ptr_op(err_msg, OP_EQ, NULL);
tt_ptr_op(reply_str, OP_EQ, NULL);
rend_authorized_client_free(client);
/* Test "ClientName:Blob" */
tor_free(reply_str);
client = add_onion_helper_clientauth("alice:475hGBHPlq7Mc0cRZitK/B",
&created, &err_msg);
&created, NULL);
tt_assert(client);
tt_assert(!created);
tt_ptr_op(err_msg, OP_EQ, NULL);
tt_ptr_op(reply_str, OP_EQ, NULL);
rend_authorized_client_free(client);
/* Test invalid client names */
tor_free(reply_str);
client = add_onion_helper_clientauth("no*asterisks*allowed", &created,
&err_msg);
NULL);
tt_ptr_op(client, OP_EQ, NULL);
tt_assert(err_msg);
tor_free(err_msg);
tt_assert(reply_str);
/* Test invalid auth cookie */
client = add_onion_helper_clientauth("alice:12345", &created, &err_msg);
tor_free(reply_str);
client = add_onion_helper_clientauth("alice:12345", &created, NULL);
tt_ptr_op(client, OP_EQ, NULL);
tt_assert(err_msg);
tor_free(err_msg);
tt_assert(reply_str);
/* Test invalid syntax */
tor_free(reply_str);
client = add_onion_helper_clientauth(":475hGBHPlq7Mc0cRZitK/B", &created,
&err_msg);
NULL);
tt_ptr_op(client, OP_EQ, NULL);
tt_assert(err_msg);
tor_free(err_msg);
tt_assert(reply_str);
done:
rend_authorized_client_free(client);
tor_free(err_msg);
tor_free(reply_str);
UNMOCK(control_write_reply);
}
/* Mocks and data/variables used for GETINFO download status tests */