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#include "acl.h"
#include "cmd.h"
#include "conf.h"
#include <string.h>
#include <evhttp.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int
acl_match_client(struct acl *a, struct evhttp_request *rq, in_addr_t *ip) {
/* check HTTP Basic Auth */
const char *auth;
auth = evhttp_find_header(rq->input_headers, "Authorization");
if(auth && a->http_basic_auth && strncasecmp(auth, "Basic ", 6) == 0) { /* sent auth */
if(strcmp(auth + 6, a->http_basic_auth) != 0) { /* wrong */
return 0;
}
}
/* CIDR check. */
if(a->cidr.enabled == 0) { /* none given, all match */
return 1;
}
if(((*ip) & a->cidr.mask) == (a->cidr.subnet & a->cidr.mask)) {
return 1;
}
return 0;
}
int
acl_allow_command(struct cmd *cmd, struct conf *cfg, struct evhttp_request *rq) {
char *always_off[] = {"MULTI", "EXEC", "WATCH", "DISCARD"};
unsigned int i;
int authorized = 1;
struct acl *a;
char *client_ip;
u_short client_port;
in_addr_t client_addr;
const char *cmd_name = cmd->argv[0];
size_t cmd_len = cmd->argv_len[0];
/* some commands are always disabled, regardless of the config file. */
for(i = 0; i < sizeof(always_off) / sizeof(always_off[0]); ++i) {
if(strncasecmp(always_off[i], cmd_name, cmd_len) == 0) {
return 0;
}
}
/* find client's address */
evhttp_connection_get_peer(rq->evcon, &client_ip, &client_port);
client_addr = ntohl(inet_addr(client_ip));
/* go through permissions */
for(a = cfg->perms; a; a = a->next) {
if(!acl_match_client(a, rq, &client_addr)) continue; /* match client */
/* go through authorized commands */
for(i = 0; i < a->enabled.count; ++i) {
if(strncasecmp(a->enabled.commands[i], cmd_name, cmd_len) == 0) {
authorized = 1;
}
}
/* go through unauthorized commands */
for(i = 0; i < a->disabled.count; ++i) {
if(strncasecmp(a->disabled.commands[i], cmd_name, cmd_len) == 0) {
authorized = 0;
}
}
}
return authorized;
}
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