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#include "redismodule.h"
#include <errno.h>
#include <assert.h>
#include <string.h>
#include <strings.h>
/* A wrap for SET command with ACL check on the key. */
int set_aclcheck_key(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
if (argc < 4) {
return RedisModule_WrongArity(ctx);
}
int permissions;
const char *flags = RedisModule_StringPtrLen(argv[1], NULL);
if (!strcasecmp(flags, "W")) {
permissions = REDISMODULE_CMD_KEY_UPDATE;
} else if (!strcasecmp(flags, "R")) {
permissions = REDISMODULE_CMD_KEY_ACCESS;
} else if (!strcasecmp(flags, "*")) {
permissions = REDISMODULE_CMD_KEY_UPDATE | REDISMODULE_CMD_KEY_ACCESS;
} else if (!strcasecmp(flags, "~")) {
permissions = 0; /* Requires either read or write */
} else {
RedisModule_ReplyWithError(ctx, "INVALID FLAGS");
return REDISMODULE_OK;
}
/* Check that the key can be accessed */
RedisModuleString *user_name = RedisModule_GetCurrentUserName(ctx);
RedisModuleUser *user = RedisModule_GetModuleUserFromUserName(user_name);
int ret = RedisModule_ACLCheckKeyPermissions(user, argv[2], permissions);
if (ret != 0) {
RedisModule_ReplyWithError(ctx, "DENIED KEY");
RedisModule_FreeModuleUser(user);
RedisModule_FreeString(ctx, user_name);
return REDISMODULE_OK;
}
RedisModuleCallReply *rep = RedisModule_Call(ctx, "SET", "v", argv + 2, argc - 2);
if (!rep) {
RedisModule_ReplyWithError(ctx, "NULL reply returned");
} else {
RedisModule_ReplyWithCallReply(ctx, rep);
RedisModule_FreeCallReply(rep);
}
RedisModule_FreeModuleUser(user);
RedisModule_FreeString(ctx, user_name);
return REDISMODULE_OK;
}
/* A wrap for PUBLISH command with ACL check on the channel. */
int publish_aclcheck_channel(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
if (argc != 3) {
return RedisModule_WrongArity(ctx);
}
/* Check that the pubsub channel can be accessed */
RedisModuleString *user_name = RedisModule_GetCurrentUserName(ctx);
RedisModuleUser *user = RedisModule_GetModuleUserFromUserName(user_name);
int ret = RedisModule_ACLCheckChannelPermissions(user, argv[1], REDISMODULE_CMD_CHANNEL_SUBSCRIBE);
if (ret != 0) {
RedisModule_ReplyWithError(ctx, "DENIED CHANNEL");
RedisModule_FreeModuleUser(user);
RedisModule_FreeString(ctx, user_name);
return REDISMODULE_OK;
}
RedisModuleCallReply *rep = RedisModule_Call(ctx, "PUBLISH", "v", argv + 1, argc - 1);
if (!rep) {
RedisModule_ReplyWithError(ctx, "NULL reply returned");
} else {
RedisModule_ReplyWithCallReply(ctx, rep);
RedisModule_FreeCallReply(rep);
}
RedisModule_FreeModuleUser(user);
RedisModule_FreeString(ctx, user_name);
return REDISMODULE_OK;
}
/* A wrap for RM_Call that check first that the command can be executed */
int rm_call_aclcheck_cmd(RedisModuleCtx *ctx, RedisModuleUser *user, RedisModuleString **argv, int argc) {
if (argc < 2) {
return RedisModule_WrongArity(ctx);
}
/* Check that the command can be executed */
int ret = RedisModule_ACLCheckCommandPermissions(user, argv + 1, argc - 1);
if (ret != 0) {
RedisModule_ReplyWithError(ctx, "DENIED CMD");
/* Add entry to ACL log */
RedisModule_ACLAddLogEntry(ctx, user, argv[1]);
return REDISMODULE_OK;
}
const char* cmd = RedisModule_StringPtrLen(argv[1], NULL);
RedisModuleCallReply* rep = RedisModule_Call(ctx, cmd, "v", argv + 2, argc - 2);
if(!rep){
RedisModule_ReplyWithError(ctx, "NULL reply returned");
}else{
RedisModule_ReplyWithCallReply(ctx, rep);
RedisModule_FreeCallReply(rep);
}
return REDISMODULE_OK;
}
int rm_call_aclcheck_cmd_default_user(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
RedisModuleString *user_name = RedisModule_GetCurrentUserName(ctx);
RedisModuleUser *user = RedisModule_GetModuleUserFromUserName(user_name);
int res = rm_call_aclcheck_cmd(ctx, user, argv, argc);
RedisModule_FreeModuleUser(user);
RedisModule_FreeString(ctx, user_name);
return res;
}
int rm_call_aclcheck_cmd_module_user(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
/* Create a user and authenticate */
RedisModuleUser *user = RedisModule_CreateModuleUser("testuser1");
RedisModule_SetModuleUserACL(user, "allcommands");
RedisModule_SetModuleUserACL(user, "allkeys");
RedisModule_SetModuleUserACL(user, "on");
RedisModule_AuthenticateClientWithUser(ctx, user, NULL, NULL, NULL);
int res = rm_call_aclcheck_cmd(ctx, user, argv, argc);
/* authenticated back to "default" user (so once we free testuser1 we will not disconnected */
RedisModule_AuthenticateClientWithACLUser(ctx, "default", 7, NULL, NULL, NULL);
RedisModule_FreeModuleUser(user);
return res;
}
/* A wrap for RM_Call that pass the 'C' flag to do ACL check on the command. */
int rm_call_aclcheck(RedisModuleCtx *ctx, RedisModuleString **argv, int argc){
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
if(argc < 2){
return RedisModule_WrongArity(ctx);
}
const char* cmd = RedisModule_StringPtrLen(argv[1], NULL);
RedisModuleCallReply* rep = RedisModule_Call(ctx, cmd, "vC", argv + 2, argc - 2);
if(!rep) {
char err[100];
switch (errno) {
case EACCES:
RedisModule_ReplyWithError(ctx, "ERR NOPERM");
break;
default:
snprintf(err, sizeof(err) - 1, "ERR errno=%d", errno);
RedisModule_ReplyWithError(ctx, err);
break;
}
} else {
RedisModule_ReplyWithCallReply(ctx, rep);
RedisModule_FreeCallReply(rep);
}
return REDISMODULE_OK;
}
int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
if (RedisModule_Init(ctx,"aclcheck",1,REDISMODULE_APIVER_1)== REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"aclcheck.set.check.key", set_aclcheck_key,"write",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"aclcheck.publish.check.channel", publish_aclcheck_channel,"",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"aclcheck.rm_call.check.cmd", rm_call_aclcheck_cmd_default_user,"",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"aclcheck.rm_call.check.cmd.module.user", rm_call_aclcheck_cmd_module_user,"",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"aclcheck.rm_call", rm_call_aclcheck,
"write",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
return REDISMODULE_OK;
}
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