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redis/tests/modules/auth.c

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/* define macros for having usleep */
#define _BSD_SOURCE
#define _DEFAULT_SOURCE
#include "redismodule.h"
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#define UNUSED(V) ((void) V)
// A simple global user
static RedisModuleUser *global = NULL;
static long long client_change_delta = 0;
void UserChangedCallback(uint64_t client_id, void *privdata) {
REDISMODULE_NOT_USED(privdata);
REDISMODULE_NOT_USED(client_id);
client_change_delta++;
}
int Auth_CreateModuleUser(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
if (global) {
RedisModule_FreeModuleUser(global);
}
global = RedisModule_CreateModuleUser("global");
RedisModule_SetModuleUserACL(global, "allcommands");
RedisModule_SetModuleUserACL(global, "allkeys");
RedisModule_SetModuleUserACL(global, "on");
return RedisModule_ReplyWithSimpleString(ctx, "OK");
}
int Auth_AuthModuleUser(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
uint64_t client_id;
RedisModule_AuthenticateClientWithUser(ctx, global, UserChangedCallback, NULL, &client_id);
return RedisModule_ReplyWithLongLong(ctx, (uint64_t) client_id);
}
int Auth_AuthRealUser(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
if (argc != 2) return RedisModule_WrongArity(ctx);
size_t length;
uint64_t client_id;
RedisModuleString *user_string = argv[1];
const char *name = RedisModule_StringPtrLen(user_string, &length);
if (RedisModule_AuthenticateClientWithACLUser(ctx, name, length,
UserChangedCallback, NULL, &client_id) == REDISMODULE_ERR) {
return RedisModule_ReplyWithError(ctx, "Invalid user");
}
return RedisModule_ReplyWithLongLong(ctx, (uint64_t) client_id);
}
/* This command redacts every other arguments and returns OK */
int Auth_RedactedAPI(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
for(int i = argc - 1; i > 0; i -= 2) {
int result = RedisModule_RedactClientCommandArgument(ctx, i);
RedisModule_Assert(result == REDISMODULE_OK);
}
return RedisModule_ReplyWithSimpleString(ctx, "OK");
}
int Auth_ChangeCount(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
long long result = client_change_delta;
client_change_delta = 0;
return RedisModule_ReplyWithLongLong(ctx, result);
}
/* The Module functionality below validates that module authentication callbacks can be registered
* to support both non-blocking and blocking module based authentication. */
/* Non Blocking Module Auth callback / implementation. */
int auth_cb(RedisModuleCtx *ctx, RedisModuleString *username, RedisModuleString *password, RedisModuleString **err) {
const char *user = RedisModule_StringPtrLen(username, NULL);
const char *pwd = RedisModule_StringPtrLen(password, NULL);
if (!strcmp(user,"foo") && !strcmp(pwd,"allow")) {
RedisModule_AuthenticateClientWithACLUser(ctx, "foo", 3, NULL, NULL, NULL);
return REDISMODULE_AUTH_HANDLED;
}
else if (!strcmp(user,"foo") && !strcmp(pwd,"deny")) {
RedisModuleString *log = RedisModule_CreateString(ctx, "Module Auth", 11);
RedisModule_ACLAddLogEntryByUserName(ctx, username, log, REDISMODULE_ACL_LOG_AUTH);
RedisModule_FreeString(ctx, log);
const char *err_msg = "Auth denied by Misc Module.";
*err = RedisModule_CreateString(ctx, err_msg, strlen(err_msg));
return REDISMODULE_AUTH_HANDLED;
}
return REDISMODULE_AUTH_NOT_HANDLED;
}
int test_rm_register_auth_cb(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
RedisModule_RegisterAuthCallback(ctx, auth_cb);
RedisModule_ReplyWithSimpleString(ctx, "OK");
return REDISMODULE_OK;
}
/*
* The thread entry point that actually executes the blocking part of the AUTH command.
* This function sleeps for 0.5 seconds and then unblocks the client which will later call
* `AuthBlock_Reply`.
* `arg` is expected to contain the RedisModuleBlockedClient, username, and password.
*/
void *AuthBlock_ThreadMain(void *arg) {
usleep(500000);
void **targ = arg;
RedisModuleBlockedClient *bc = targ[0];
int result = 2;
const char *user = RedisModule_StringPtrLen(targ[1], NULL);
const char *pwd = RedisModule_StringPtrLen(targ[2], NULL);
if (!strcmp(user,"foo") && !strcmp(pwd,"block_allow")) {
result = 1;
}
else if (!strcmp(user,"foo") && !strcmp(pwd,"block_deny")) {
result = 0;
}
else if (!strcmp(user,"foo") && !strcmp(pwd,"block_abort")) {
RedisModule_BlockedClientMeasureTimeEnd(bc);
RedisModule_AbortBlock(bc);
goto cleanup;
}
/* Provide the result to the blocking reply cb. */
void **replyarg = RedisModule_Alloc(sizeof(void*));
replyarg[0] = (void *) (uintptr_t) result;
RedisModule_BlockedClientMeasureTimeEnd(bc);
RedisModule_UnblockClient(bc, replyarg);
cleanup:
/* Free the username and password and thread / arg data. */
RedisModule_FreeString(NULL, targ[1]);
RedisModule_FreeString(NULL, targ[2]);
RedisModule_Free(targ);
return NULL;
}
/*
* Reply callback for a blocking AUTH command. This is called when the client is unblocked.
*/
int AuthBlock_Reply(RedisModuleCtx *ctx, RedisModuleString *username, RedisModuleString *password, RedisModuleString **err) {
REDISMODULE_NOT_USED(password);
void **targ = RedisModule_GetBlockedClientPrivateData(ctx);
int result = (uintptr_t) targ[0];
size_t userlen = 0;
const char *user = RedisModule_StringPtrLen(username, &userlen);
/* Handle the success case by authenticating. */
if (result == 1) {
RedisModule_AuthenticateClientWithACLUser(ctx, user, userlen, NULL, NULL, NULL);
return REDISMODULE_AUTH_HANDLED;
}
/* Handle the Error case by denying auth */
else if (result == 0) {
RedisModuleString *log = RedisModule_CreateString(ctx, "Module Auth", 11);
RedisModule_ACLAddLogEntryByUserName(ctx, username, log, REDISMODULE_ACL_LOG_AUTH);
RedisModule_FreeString(ctx, log);
const char *err_msg = "Auth denied by Misc Module.";
*err = RedisModule_CreateString(ctx, err_msg, strlen(err_msg));
return REDISMODULE_AUTH_HANDLED;
}
/* "Skip" Authentication */
return REDISMODULE_AUTH_NOT_HANDLED;
}
/* Private data freeing callback for Module Auth. */
void AuthBlock_FreeData(RedisModuleCtx *ctx, void *privdata) {
REDISMODULE_NOT_USED(ctx);
RedisModule_Free(privdata);
}
/* Callback triggered when the engine attempts module auth
* Return code here is one of the following: Auth succeeded, Auth denied,
* Auth not handled, Auth blocked.
* The Module can have auth succeed / denied here itself, but this is an example
* of blocking module auth.
*/
int blocking_auth_cb(RedisModuleCtx *ctx, RedisModuleString *username, RedisModuleString *password, RedisModuleString **err) {
REDISMODULE_NOT_USED(username);
REDISMODULE_NOT_USED(password);
REDISMODULE_NOT_USED(err);
/* Block the client from the Module. */
RedisModuleBlockedClient *bc = RedisModule_BlockClientOnAuth(ctx, AuthBlock_Reply, AuthBlock_FreeData);
int ctx_flags = RedisModule_GetContextFlags(ctx);
if (ctx_flags & REDISMODULE_CTX_FLAGS_MULTI || ctx_flags & REDISMODULE_CTX_FLAGS_LUA) {
/* Clean up by using RedisModule_UnblockClient since we attempted blocking the client. */
RedisModule_UnblockClient(bc, NULL);
return REDISMODULE_AUTH_HANDLED;
}
RedisModule_BlockedClientMeasureTimeStart(bc);
pthread_t tid;
/* Allocate memory for information needed. */
void **targ = RedisModule_Alloc(sizeof(void*)*3);
targ[0] = bc;
targ[1] = RedisModule_CreateStringFromString(NULL, username);
targ[2] = RedisModule_CreateStringFromString(NULL, password);
/* Create bg thread and pass the blockedclient, username and password to it. */
if (pthread_create(&tid, NULL, AuthBlock_ThreadMain, targ) != 0) {
RedisModule_AbortBlock(bc);
}
return REDISMODULE_AUTH_HANDLED;
}
int test_rm_register_blocking_auth_cb(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
RedisModule_RegisterAuthCallback(ctx, blocking_auth_cb);
RedisModule_ReplyWithSimpleString(ctx, "OK");
return REDISMODULE_OK;
}
/* This function must be present on each Redis module. It is used in order to
* register the commands into the Redis server. */
int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
if (RedisModule_Init(ctx,"testacl",1,REDISMODULE_APIVER_1)
== REDISMODULE_ERR) return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"auth.authrealuser",
Auth_AuthRealUser,"no-auth",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"auth.createmoduleuser",
Auth_CreateModuleUser,"",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"auth.authmoduleuser",
Auth_AuthModuleUser,"no-auth",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"auth.changecount",
Auth_ChangeCount,"",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"auth.redact",
Auth_RedactedAPI,"",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"testmoduleone.rm_register_auth_cb",
test_rm_register_auth_cb,"",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"testmoduleone.rm_register_blocking_auth_cb",
test_rm_register_blocking_auth_cb,"",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
return REDISMODULE_OK;
}
int RedisModule_OnUnload(RedisModuleCtx *ctx) {
UNUSED(ctx);
if (global)
RedisModule_FreeModuleUser(global);
return REDISMODULE_OK;
}
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