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#include "aclk_proxy.h"
#include "daemon/common.h"
#define ACLK_PROXY_ENV "env"
#define ACLK_PROXY_CONFIG_VAR "proxy"
struct {
ACLK_PROXY_TYPE type;
const char *url_str;
} supported_proxy_types[] = {
{ .type = PROXY_TYPE_SOCKS5, .url_str = "socks5" ACLK_PROXY_PROTO_ADDR_SEPARATOR },
{ .type = PROXY_TYPE_SOCKS5, .url_str = "socks5h" ACLK_PROXY_PROTO_ADDR_SEPARATOR },
{ .type = PROXY_TYPE_HTTP, .url_str = "http" ACLK_PROXY_PROTO_ADDR_SEPARATOR },
{ .type = PROXY_TYPE_UNKNOWN, .url_str = NULL },
};
const char *aclk_proxy_type_to_s(ACLK_PROXY_TYPE *type)
{
switch (*type) {
case PROXY_DISABLED:
return "disabled";
case PROXY_TYPE_HTTP:
return "HTTP";
case PROXY_TYPE_SOCKS5:
return "SOCKS";
default:
return "Unknown";
}
}
static inline ACLK_PROXY_TYPE aclk_find_proxy(const char *string)
{
int i = 0;
while (supported_proxy_types[i].url_str) {
if (!strncmp(supported_proxy_types[i].url_str, string, strlen(supported_proxy_types[i].url_str)))
return supported_proxy_types[i].type;
i++;
}
return PROXY_TYPE_UNKNOWN;
}
ACLK_PROXY_TYPE aclk_verify_proxy(const char *string)
{
if (!string)
return PROXY_TYPE_UNKNOWN;
while (*string == 0x20)
string++;
if (!*string)
return PROXY_TYPE_UNKNOWN;
return aclk_find_proxy(string);
}
// helper function to censor user&password
// for logging purposes
void safe_log_proxy_censor(char *proxy)
{
size_t length = strlen(proxy);
char *auth = proxy + length - 1;
char *cur;
while ((auth >= proxy) && (*auth != '@'))
auth--;
//if not found or @ is first char do nothing
if (auth <= proxy)
return;
cur = strstr(proxy, ACLK_PROXY_PROTO_ADDR_SEPARATOR);
if (!cur)
cur = proxy;
else
cur += strlen(ACLK_PROXY_PROTO_ADDR_SEPARATOR);
while (cur < auth) {
*cur = 'X';
cur++;
}
}
static inline void safe_log_proxy_error(char *str, const char *proxy)
{
char *log = strdupz(proxy);
safe_log_proxy_censor(log);
error("%s Provided Value:\"%s\"", str, log);
freez(log);
}
static inline int check_socks_enviroment(const char **proxy)
{
char *tmp = getenv("socks_proxy");
if (!tmp)
return 1;
if (aclk_verify_proxy(tmp) == PROXY_TYPE_SOCKS5) {
*proxy = tmp;
return 0;
}
safe_log_proxy_error(
"Environment var \"socks_proxy\" defined but of unknown format. Supported syntax: \"socks5[h]://[user:pass@]host:ip\".",
tmp);
return 1;
}
static inline int check_http_enviroment(const char **proxy)
{
char *tmp = getenv("http_proxy");
if (!tmp)
return 1;
if (aclk_verify_proxy(tmp) == PROXY_TYPE_HTTP) {
*proxy = tmp;
return 0;
}
safe_log_proxy_error(
"Environment var \"http_proxy\" defined but of unknown format. Supported syntax: \"http[s]://[user:pass@]host:ip\".",
tmp);
return 1;
}
const char *aclk_lws_wss_get_proxy_setting(ACLK_PROXY_TYPE *type)
{
const char *proxy = config_get(CONFIG_SECTION_CLOUD, ACLK_PROXY_CONFIG_VAR, ACLK_PROXY_ENV);
*type = PROXY_DISABLED;
if (strcmp(proxy, "none") == 0)
return proxy;
if (strcmp(proxy, ACLK_PROXY_ENV) == 0) {
if (check_socks_enviroment(&proxy) == 0) {
#ifdef LWS_WITH_SOCKS5
*type = PROXY_TYPE_SOCKS5;
return proxy;
#else
safe_log_proxy_error("socks_proxy environment variable set to use SOCKS5 proxy "
"but Libwebsockets used doesn't have SOCKS5 support built in. "
"Ignoring and checking for other options.",
proxy);
#endif
}
if (check_http_enviroment(&proxy) == 0)
*type = PROXY_TYPE_HTTP;
return proxy;
}
*type = aclk_verify_proxy(proxy);
#ifndef LWS_WITH_SOCKS5
if (*type == PROXY_TYPE_SOCKS5) {
safe_log_proxy_error(
"Config var \"" ACLK_PROXY_CONFIG_VAR
"\" set to use SOCKS5 proxy but Libwebsockets used is built without support for SOCKS proxy. ACLK will be disabled.",
proxy);
}
#endif
if (*type == PROXY_TYPE_UNKNOWN) {
*type = PROXY_DISABLED;
safe_log_proxy_error(
"Config var \"" ACLK_PROXY_CONFIG_VAR
"\" defined but of unknown format. Supported syntax: \"socks5[h]://[user:pass@]host:ip\".",
proxy);
}
return proxy;
}
// helper function to read settings only once (static)
// as claiming, challenge/response and ACLK
// read the same thing, no need to parse again
const char *aclk_get_proxy(ACLK_PROXY_TYPE *type)
{
static const char *proxy = NULL;
static ACLK_PROXY_TYPE proxy_type = PROXY_NOT_SET;
if (proxy_type == PROXY_NOT_SET)
proxy = aclk_lws_wss_get_proxy_setting(&proxy_type);
*type = proxy_type;
return proxy;
}
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