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tls_scanner.cc
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//
// tls_scanner.cc
//
// tls_scanner scans an HTTPS server and obtains and reports its TLS
// certificate chain and HTTP response. It can access domain-fronted
// HTTP servers, and test for domain fronting, when an inner_hostname
// is provided that is distinct from the (outer) hostname. By
// default, it reports all of the "src=" links in the returned HTML;
// if the HTTP response status code indicates that the resource has
// moved (codes 301 and 302), then the entire response body is printed
// out. The program is a simple wrapper around the tls_scanner class.
//
// Copyright (c) 2021 Cisco Systems, Inc. All rights reserved. License at
// https://github.com/cisco/mercury/blob/master/LICENSE
#include <string>
#include <unordered_map>
#include <set>
#include <regex>
#include <array>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/x509v3.h>
#include "libmerc/x509.h"
#include "libmerc/http.h"
#include "libmerc/json_object.h"
#include "libmerc/dns.h"
#include "libmerc/base64.h"
#include "options.h"
std::array ua_strings = {
"Microsoft-CryptoAPI/10.0",
"Go-http-client/1.1",
"com.apple.trustd/2.0",
"Python-urllib/1.17",
"dms_api/1.0",
"HTTPing v2.4",
"HTTPing v2.5",
"Microsoft BITS/7.8",
"python-requests/2.22.0",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0",
"Microsoft-Delivery-Optimization/10.0",
"Prometheus/2.17.2",
"avi/1.0",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36",
"Java/11.0.8",
"Mozilla/4.7 [en] (X11; U; SunOS 5.6 sun4u)",
"Artifactory/6.14.2",
"Monit/5.20.0",
"Java/1.8.0_112",
"Mozilla/4.0 (compatible; ms-office; MSOffice 16)",
"FortiGate (FortiOS 6.0) Chrome/ Safari/",
"python-requests/2.23.0",
"curl/7.66.0",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/83.0.4103.61 HeadlessChrome/83.0.4103.61 Safari/537.36",
"libwww-perl/6.13",
"axios/0.21.1",
"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0",
"curl/7.47.0",
"cisco-IOS",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.32 Safari/537.36",
"FlexNet",
"curl/7.64.1",
"python-requests/2.24.0",
"curl/7.29.0",
"curl/7.58.0",
"ccmhttp",
"python-requests/2.21.0",
"ConnMan/1.37 wispr",
"Microsoft NCSI",
"WinHttp-Autoproxy-Service/5.1",
"Java/1.8.0_212",
"curl/7.50.1",
"Fluent-Bit",
"Microsoft-WNS/10.0",
"Jakarta Commons-HttpClient/3.1",
"MICROSOFT_DEVICE_METADATA_RETRIEVAL_CLIENT",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:85.0) Gecko/20100101 Firefox/85.0",
"python-requests/2.15.1",
"Apache-HttpClient/4.5.3 (Java/1.8.0_252)",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:85.0) Gecko/20100101 Firefox/85.0",
"Python-urllib/3.6",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36",
"Windows-Update-Agent/10.0.10011.16384 Client-Protocol/1.40",
"Microsoft-CryptoAPI/6.3",
"mimir-api/v1.51.0",
"Ruby",
"SXM-360L/1.0",
"python-requests/2.18.4",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_16_0) AppleWebKit/537.36 (KHTML, like Gecko) Brackets/1.13.0 Chrome/51.0.2704.103 Safari/537.36",
"Nuclei - Open-source project (github.com/projectdiscovery/nuclei)",
"tvoice",
"Apache-HttpClient/4.3.6 (java 1.5)",
"AHC/1.0",
"curl/7.61.1",
"Microsoft-CryptoAPI/6.1",
"Prometheus/2.21.0",
"Mozilla/5.0 (iPhone; CPU iPhone OS 14_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148",
"Horizon Camera for eHi",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36 Edg/88.0.705.74",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36",
"curl/7.60.0",
"Mono Web Services Client Protocol 4.0.50524.0",
"curl/7.54.0",
"artifactory-client-java/2.8.3",
"libwww-perl/6.04",
"python-requests/2.10.0",
"urlgrabber/3.10 yum/3.4.3",
"AHC/2.1",
"GoogleEarth/7.1.0003.0000(MIB;QNX (0.0.0.0);en;kml:2.2;client:Free;type:default)",
"CITRIXRECEIVER",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.190 Safari/537.36",
"WebEx/0.0.0.0 (Macintosh; OSX)",
"Microsoft BITS/7.7",
"Java/1.7.0_45",
"Apache-HttpClient/4.5.2 (Java/1.8.0_212)",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:86.0) Gecko/20100101 Firefox/86.0",
"Python-urllib/3.5",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36",
"Mozilla/5.0",
"ConnMan/1.22 wispr",
"Dalvik/2.1.0 (Linux; U; Android 5.1.1; Honda Generation 1 mid grade Build/LMY48P)",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36",
"SNAP/1.4",
"MicroMessenger Client",
"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36",
"WebexTeams",
"curl/7.67.0",
"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.1",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:85.0) Gecko/20100101 Firefox/85.0",
"curl/7.28.0",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0",
"SFDC-Callout/51.0",
"Wget/1.15 (linux-gnu)",
"kube-probe/1.17",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko)",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0",
"ImmunetProtect/7.2.13.11865",
"libwww-perl/6.05",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0",
"websocket-sharp/1.0",
"Mozilla/5.0 (compatible, MSIE 11, Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko",
"GstpServer/10.15.6.6 macOS Version 10.15.7 (Build 19H114)",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36",
"python-requests/2.20.1",
"Dalvik/1.6.0 (Linux; U; Android 4.4.2; SAMSUNG-SM-G900A Build/KOT49H)",
"Mist-webhook",
"Apache-HttpClient/4.5.2 (Java/1.8.0_232)",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36",
"python-requests/2.25.1",
"python-requests/2.2.1 CPython/2.7.6 Linux/3.13.0-170-generic",
"Apache-HttpClient/4.5.12 (Java/1.8.0_212)",
"Java/1.8.0_161",
"Dalvik/2.1.0 (Linux; U; Android 5.1.1; C401U Build/2050182)",
"Java/1.8.0_271",
"Debian APT-HTTP/1.3 (1.6.12ubuntu0.2)",
"Windows-Update-Agent/10.0.10011.16384 Client-Protocol/2.31",
"GstpServer/10.15.6.6 macOS Version 10.14.6 (Build 18G8022)",
"Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko AnyConnect/4.9.04043 (win)",
"Java/1.8.0_192",
"EMAN/1.0",
"QUECTEL_MODULE",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko)",
"Microsoft Office/16.0 (Windows NT 10.0; Microsoft Outlook 16.0.13530; Pro)",
"Axis2",
"Dalvik/2.1.0 (Linux; U; Android 8.1.0; C403 Build/3050616)",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:84.0) Gecko/20100101 Firefox/84.0",
"Apache-HttpClient/4.5.3 (Java/1.8.0_141)",
"Mozilla/5.0 (compatible; U; Linux; en-US) WebKit/534.34 (KHTML, like Gecko)",
"Mozilla/5.0 (compatible; PRTG Network Monitor (www.paessler.com); Windows)",
"Python/3.5 aiohttp/2.2.5",
"Typhoeus - https://github.com/typhoeus/typhoeus",
"/home/cec/bin/getc3attach C3sr ver. 1.3",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:85.0) Gecko/20100101 Firefox/85.0",
"aws-sdk-java/1.11.764 Linux/3.10.0-1062.9.1.el7.x86_64 OpenJDK_64-Bit_Server_VM/11.0.5+10-alpine-r0 java/11.0.5 groovy/2.5.10 kotlin/1.3.71 vendor/Alpine",
"python-requests/2.9.1",
"GCSL_GCSP 3.05.4.1615",
"Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko",
"Facebook",
"Windows-Update-Agent/10.0.10011.16384 Client-Protocol/2.0",
"Java/1.7.0_80",
"Artifactory/6.23.1",
"Microsoft WinRM Client",
"python-requests/2.25.0",
"Pandora/1.37 Android/6.0.1 gminfo35",
"okhttp/4.7.2",
"ReactorNetty/0.9.7.RELEASE",
"Windows Microsoft Windows 10 Enterprise ZTunnel/1.0",
"CaptiveNetworkSupport-407.40.1 wispr",
"Python-urllib/2.7",
"trustd (unknown version) CFNetwork/902.6 Darwin/17.7.0 (x86_64)",
"Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.3) Gecko/2008092416 Firefox/3.0.3",
"Dalvik/2.1.0 (Linux; U; Android 5.1.1; Acura Infotainment System Build/LMY48P)",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.19041",
"Apache-HttpClient/4.5.3 (Java/11.0.3)",
"Cisco/CE",
"python-requests/2.12.1",
"libdnf",
"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.18) Gecko/2010020220 Firefox/3.0.18 (.NET CLR 3.5.30729)",
"Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Firefox/52.0",
"Digi-Rabbit-httpc/1.08",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15",
"Apache-HttpClient/4.5.9 (Java/1.8.0_144)",
"Mozilla/5.0 (X11; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0",
"Apache-HttpClient/4.2.5 (java 1.5)",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36",
"urlgrabber/3.9.1 yum/3.2.29",
"libwww-perl/6.15",
"python-requests/2.18.1",
"Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1",
"curl/7.19.4 (i386-portbld-freebsd7.2) libcurl/7.19.4 OpenSSL/0.9.8k zlib/1.2.3",
"libdnf (CentOS Linux 8; generic; Linux.x86_64)",
"WebEx/1.0.0.2 (Windows;)",
"GitHub-Hookshot/b64057b",
"Debian APT-HTTP/1.3 (1.2.32ubuntu0.2)",
"Apache-HttpClient/4.4.1 (Java/1.8.0_252)",
"FireAmpLinux/1.12.1.676",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36",
"Java/1.8.0_242",
"Niagara/3.8.41",
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"Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0",
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"Prometheus/2.23.0",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0",
"Dalvik/2.1.0 (Linux; U; Android 10; SM-G960U Build/QP1A.190711.020)",
"Apache-HttpClient/4.5.1 (Java/1.8.0_212)",
"Dalvik/2.1.0 (Linux; U; Android 10; SM-N960U Build/QP1A.190711.020)",
"Cisco/M100V (AsyncOS zeus 13.6.2-023)",
"Mozilla/5.0 (compatible; bingbot/2.0; +https://www.bing.com/bingbot.htm)"
};
struct hostname : public datum {
hostname() : datum{NULL, NULL} { }
void parse(struct datum &d) {
accept_hostname(d);
}
void accept_hostname(struct datum &d) {
if (d.data == NULL || d.data >= d.data_end) {
return;
}
data = d.data;
const uint8_t *tmp_data = d.data;
while (tmp_data < d.data_end) {
if (!isalnum(*tmp_data) && *tmp_data != '.' && *tmp_data != '-') {
break;
}
tmp_data++;
}
data_end = d.data = tmp_data;
}
};
struct uri_path : public datum {
uri_path() : datum{NULL, NULL} { }
void parse(struct datum &d) {
accept_path(d);
}
void accept_path(struct datum &d) {
if (d.data == NULL || d.data >= d.data_end) {
return;
}
data = d.data;
const uint8_t *tmp_data = d.data;
while (tmp_data < d.data_end) {
// note: this function works with valid paths that are
// exctacted from HTML links, which are terminated by a
// quotation, but it is not appropriate for other use
// cases
if (*tmp_data == '\"') {
break;
}
tmp_data++;
}
data_end = d.data = tmp_data;
}
};
struct uri {
struct datum scheme;
struct hostname host;
struct uri_path path;
public:
uri(struct datum &d) : scheme{}, host{}, path{} {
parse(d);
}
void parse(struct datum &d) {
// find start of host
uint8_t slash_pair[2] = { '/', '/' };
if (datum_skip_upto_delim(&d, slash_pair, sizeof(slash_pair)) == status_err) {
return;
};
host.parse(d);
path.parse(d);
}
};
class tls_scanner {
private:
SSL_CTX *ctx = NULL;
constexpr static const char *tlsv1_3_only_ciphersuites = "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_CCM_SHA256:TLS_AES_128_CCM_8_SHA256";
constexpr static const char *user_agent_default = "Mozilla/5.0 (Linux; ; ) AppleWebKit/ (KHTML, like Gecko) Chrome/ Mobile Safari/\r\n"; // pretend we're Android;
bool print_cert = true;
bool print_response_body = true;
bool print_src_links = true;
bool omit_sni;
std::string user_agent;
std::vector<std::string> hosts_visited;
BIO *tls_connection_open(std::string &hostname) {
#if OPENSSL_VERSION_NUMBER < 0x10100000L
SSL_library_init();
SSL_load_error_strings();
#endif
// initialize openssl session context
#if OPENSSL_VERSION_NUMBER < 0x10100000L
ctx = SSL_CTX_new(TLSv1_2_client_method());
#else
ctx = SSL_CTX_new(TLS_client_method());
#endif
if (ctx == NULL) {
throw "error: could not initialize TLS context\n";
}
if (SSL_CTX_set_default_verify_paths(ctx) != 1) {
throw "error: could not initialize TLS verification\n";
}
std::string host_and_port = hostname + ":443";
BIO *bio = BIO_new_connect(host_and_port.c_str());
if (bio == nullptr) {
throw "error: could not create BIO\n";
}
if (BIO_do_connect(bio) <= 0) {
fprintf(stderr, "warning: TLS connection to %s failed\n", host_and_port.c_str());
//throw "error: could not connect to %s\n";
return nullptr;
}
BIO *tls_bio = BIO_new_ssl(ctx, 1);
if (tls_bio == NULL) {
throw "error: BIO_new_ssl() returned NULL\n";
}
BIO_push(tls_bio, bio);
SSL *tls = NULL;
BIO_get_ssl(tls_bio, &tls);
if (tls == NULL) {
throw "error: could not initialize TLS context\n";
}
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
constexpr bool tls_version_1_3_only = false;
if (tls_version_1_3_only) {
int status = SSL_set_min_proto_version(tls, TLS1_3_VERSION);
if (status != 1) {
fprintf(stderr, "warning: could not set protocol version to 1.3 (status=%d)\n", status);
// throw "error: could not set protocol version to 1.2\n";
}
}
#endif
// status = SSL_set_cipher_list(tls, tlsv1_3_only);
// if (status != 1) {
// fprintf(stderr, "warning: SSL_CTX_set_cipher_list() returned %d\n", status);
// // throw "error: could not set TLSv1.3-only ciphersuites\n";
// }
if (!omit_sni) {
SSL_set_tlsext_host_name(tls, hostname.c_str());
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
SSL_set1_host(tls, hostname.c_str());
#endif
}
if (BIO_do_handshake(tls_bio) <= 0) {
throw "error: TLS handshake failed\n";
}
// record successful visit to host
hosts_visited.push_back(hostname);
int err = SSL_get_verify_result(tls);
if (err != X509_V_OK) {
const char *message = X509_verify_cert_error_string(err);
fprintf(stderr, "note: certificate verification failed (%s, code %d)\n", message, err);
}
X509 *cert = SSL_get_peer_certificate(tls);
if (cert == nullptr) {
fprintf(stderr, "note: server did not present a certificate\n");
}
uint8_t *cert_buffer = NULL;
int cert_len = i2d_X509(cert, &cert_buffer);
if (print_cert && cert_len > 0) {
// parse and print certificate using libmerc/asn1/x509.h
struct x509_cert cc;
cc.parse(cert_buffer, cert_len);
cc.print_as_json(stdout);
}
#if OPENSSL_VERSION_NUMBER < 0x10100000L
if (X509_check_host(cert, hostname.data(), hostname.size(), 0, nullptr) != 1) {
fprintf(stderr, "note: host verification failed\n");
}
#else
// X509_check_host() called automatically
#endif
return tls_bio;
}
void tls_connection_close(BIO *tls_bio) {
BIO_ssl_shutdown(tls_bio);
//
// TODO: more openssl shutdown is needed; this should be
// implemented in order to allow scanner re-use across
// multiple queries (valgrind shows leaks from BIO_new_ssl)
}
public:
tls_scanner(bool cert, bool response_body, bool src_links, bool no_sni) : print_cert{cert}, print_response_body{response_body}, print_src_links{src_links}, omit_sni{no_sni}, user_agent{user_agent_default}, hosts_visited{} { }
bool set_user_agent(const std::string ua_search_string) {
if (ua_search_string != "") {
std::regex ua_regex(ua_search_string);
for (std::string s : ua_strings) {
if (std::regex_search(s, ua_regex)) {
user_agent = s + "\r\n";
fprintf(stderr, "user_agent: \"%s\"\n", s.c_str());
return true; // found match
}
}
}
return false; // no match found; user_agent is still default value
}
// note: scan() should be rewritten so that its input strings are const; as written,
// those strings could be changed
//
void scan(std::string &hostname, std::string &inner_hostname, bool doh=false) {
std::string redirect = "";
std::string &http_host_field = inner_hostname;
bool trim_hostname = false;
if (inner_hostname == "") {
http_host_field = hostname;
trim_hostname = true;
}
// set path, if there is one, and trim the path off of the
// host string(s) as needed
//
std::string path = "/";
size_t idx = http_host_field.find("/");
if (idx != std::string::npos) {
path = http_host_field.substr(idx, std::string::npos);
http_host_field.resize(idx);
if (trim_hostname) {
hostname.resize(idx);
}
if (doh) {
fprintf(stderr, "error: path set for DoH query\n");
return;
}
}
if (doh) {
// experimental support for DoH queries
//
// TODO: encapsulate DNS encoding within DNS classes for
// the sake of maintainability
path += "dns-query?dns=";
uint8_t dns_message[2048];
dns_hdr *header = (dns_hdr *)&dns_message[0];
header->id = 0x0000; // DoH clients SHOULD use 0 in each request
header->flags = htons(0x0100);
header->qdcount = htons(1);
header->ancount = htons(0);
header->nscount = htons(0);
header->arcount = htons(0);
uint8_t *rr_start = &dns_message[sizeof(dns_hdr)];
uint8_t *s = (uint8_t *)inner_hostname.c_str();
while (true) {
uint8_t *t = s;
while (true) {
if (*t == '.' || *t == 0) {
break;
}
t++;
}
if (t == s) {
break;
}
*rr_start++ = (uint8_t) (t - s);
memcpy(rr_start, s, (t-s));
rr_start += (t - s);
if (*t == 0) {
break;
}
t++;
s = t;
}
*rr_start++ = 0; // terminate name with zero-length label
if (true) {
*rr_start++ = 0x00; // qtype in network byte order (A)
*rr_start++ = 0x01;
} else {
*rr_start++ = 0x00; // qtype in network byte order (AAAA)
*rr_start++ = 0x1c;
}
*rr_start++ = 0x00; // qclass in network byte order (IN)
*rr_start++ = 0x01;
size_t dns_message_len = rr_start - &dns_message[0];
std::string dns_query = dns_get_json_string((const char *)dns_message, dns_message_len);
fprintf(stdout, "{\"dns\":%s}\n", dns_query.c_str());
std::string dns_string = base64_encode(dns_message, dns_message_len, base64url_table);
path += dns_string;
// fprintf(stderr, "dns_string: '%s'\n", dns_string.c_str());
// fprintf(stderr, "path: %s\n", path.c_str());
}
// fprintf(stderr, "hostname: %s\n", hostname.c_str());
// fprintf(stderr, "inner host: %s\n", inner_hostname.c_str());
// fprintf(stderr, "host field: %s\n", http_host_field.c_str());
// fprintf(stderr, "path: %s\n", path.c_str());
if (hostname == "") {
//fprintf(stderr, "warning: empty hostname found\n");
return;
}
BIO *tls_bio = tls_connection_open(hostname);
if (tls_bio == nullptr) {
return; // error: could not connect to host
}
// send HTTP request
std::string line = "GET " + path + " HTTP/1.1";
std::string request = line + "\r\n";
request += "User-Agent: " + user_agent;
request += "Connection: close\r\n";
if (doh) {
request += "Accept: application/dns-message\r\nHost: " + hostname + "\r\n";
} else {
request += "Host: " + http_host_field + "\r\n";
}
request += "\r\n";
BIO_write(tls_bio, request.data(), request.size());
BIO_flush(tls_bio);
// parse HTTP request for JSON output
const uint8_t *http_req_buffer = (const uint8_t *)request.data();
struct datum http_req_data{http_req_buffer, http_req_buffer + request.length()};
http_request req;
req.parse(http_req_data);
// report http request
char output_buffer[1024*16];
struct buffer_stream output_buffer_stream{output_buffer, sizeof(output_buffer)};
struct json_object http_record{&output_buffer_stream};
req.write_json(http_record, true);
http_record.close();
output_buffer_stream.write_line(stdout);
// get HTTP response
int http_response_len = 0, read_len = 0;
char http_buffer[1024*256] = {};
char *current = http_buffer;
do {
read_len = BIO_read(tls_bio, current, sizeof(http_buffer) - http_response_len);
current += read_len;
http_response_len += read_len;
//fprintf(stderr, "BIO_read %d bytes\n", read_len);
} while (read_len > 0 || BIO_should_retry(tls_bio));
// parse and process http_response message
if(http_response_len > 0) {
bool parse_response = true;
// fprintf(stdout, "%.*s", http_response_len, http_buffer);
// parse http headers, and print as JSON
const unsigned char *tmp = (const unsigned char *)http_buffer;
struct datum http{tmp, tmp+http_response_len};
if (parse_response) {
http_response response;
response.parse(http);
output_buffer_stream = {output_buffer, sizeof(output_buffer)}; // reset
struct json_object http_record{&output_buffer_stream};
response.write_json(http_record);
http_record.close();
output_buffer_stream.write_line(stdout);
std::basic_string<uint8_t> loc = { 'l', 'o', 'c', 'a', 't', 'i', 'o', 'n', ':', ' ' };
struct datum location = response.get_header(loc);
if (location.is_not_empty()) {
fprintf(stderr, "location header: %.*s\n", (int)location.length(), location.data);
uri location_uri{location};
fprintf(stderr, "location host: %.*s\n", (int)location_uri.host.length(), location_uri.host.data);
redirect = location_uri.host.get_string();
}
std::basic_string<uint8_t> cc = { 'c', 'a', 'c', 'h', 'e', '-', 'c', 'o', 'n', 't', 'r', 'o', 'l', ':', ' ' };
struct datum cache_control = response.get_header(cc);
if (cache_control.is_not_empty()) {
fprintf(stdout, "cache-control header: %.*s\n", (int)cache_control.length(), cache_control.data);
}
std::basic_string<uint8_t> ct = { 'c', 'o', 'n', 't', 'e', 'n', 't', '-', 't', 'y', 'p', 'e', ':', ' ' };
struct datum content_type = response.get_header(ct);
if (content_type.is_not_empty()) {
fprintf(stderr, "content-type: %.*s\n", (int)content_type.length(), content_type.data);
uint8_t app_type_dns[] = { 'a', 'p', 'p', 'l', 'i', 'c', 'a', 't', 'i', 'o', 'n', '/', 'd', 'n', 's', '-', 'm', 'e', 's', 's', 'a', 'g', 'e' };
struct datum app_type_dns_datum{app_type_dns, app_type_dns + sizeof(app_type_dns)};
if (content_type.case_insensitive_match(app_type_dns_datum)) {
// output response as JSON object
std::string dns_response = dns_get_json_string((const char *)http.data, http.length());
fprintf(stdout, "{\"dns\":%s}\n", dns_response.c_str());
}
}
if (print_response_body) { // || response.status_code.compare("301", 3) == 0 || response.status_code.compare("302", 3) == 0 ) {
// print out redirect data
fprintf(stdout, "body: %.*s\n", (int)http.length(), http.data);
}
}
// print out raw body
//fprintf(stdout, "body: %.*s", (int)http.length(), http.data);
// find src= links in page
std::set<std::string> src_links = {};
std::string http_body = http.get_string();
std::smatch matches;
//std::regex rgx("src.{2,8}(http(s)*:)*//[a-zA-Z0-9-]*(\\.[a-zA-Z0-9-]*)*");
std::regex rgx("src=\"[^\"]*\"");
while (std::regex_search(http_body, matches, rgx)) {
// fprintf(stdout, "%s\n", matches[0].str().c_str());
src_links.insert(matches[0].str());
http_body = matches.suffix().str();
}
// follow src= links, if any
for (const auto &x : src_links) {
if (print_src_links) {
//fprintf(stderr, "src= %s\n", x.c_str());
// TODO: load relative src= links if they are HTML
// TODO: set path part of host/path, for absolute src= links
uint8_t *tmp = (uint8_t *)x.data();
datum src{tmp, tmp+x.length()};
uri u{src};
std::string host = u.host.get_string();
// fprintf(stdout, "found src= link host=%s, path=%.*s\n",
// host.c_str(),
// (int)u.path.length(), u.path.data);
if (!was_previously_visited(host)) {
// append path to host, since scan() expects that
host += u.path.get_string();
scan(host, host);
}
}