diff options
Diffstat (limited to 'aclk/aclk_proxy.c')
| -rw-r--r-- | aclk/aclk_proxy.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/aclk/aclk_proxy.c b/aclk/aclk_proxy.c new file mode 100644 index 000000000..1701eb8e8 --- /dev/null +++ b/aclk/aclk_proxy.c @@ -0,0 +1,186 @@ +#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; +} |