--- /dev/null
+#ifndef __NGINX_SSL_UTIL_HPP
+#define __NGINX_SSL_UTIL_HPP
+
+#include <thread>
+
+#ifdef NO_PCRE
+#include <regex>
+namespace rgx = std;
+#else
+#include "regex-pcre.hpp"
+#endif
+
+#include "nginx-util.hpp"
+#include "px5g-openssl.hpp"
+
+
+#ifndef NO_UBUS
+static constexpr auto UBUS_TIMEOUT = 1000;
+#endif
+
+// once a year:
+static constexpr auto CRON_INTERVAL = std::string_view{"3 3 12 12 *"};
+
+static constexpr auto LAN_SSL_LISTEN =
+ std::string_view{"/var/lib/nginx/lan_ssl.listen"};
+
+static constexpr auto LAN_SSL_LISTEN_DEFAULT =
+ std::string_view{"/var/lib/nginx/lan_ssl.listen.default"};
+
+static constexpr auto ADD_SSL_FCT = std::string_view{"add_ssl"};
+
+static constexpr auto SSL_SESSION_CACHE_ARG =
+ [](const std::string_view & /*name*/) -> std::string
+ { return "shared:SSL:32k"; };
+
+static constexpr auto SSL_SESSION_TIMEOUT_ARG = std::string_view{"64m"};
+
+
+using _Line =
+ std::array< std::string (*)(const std::string &, const std::string &), 2 >;
+
+class Line {
+
+private:
+
+ _Line _line;
+
+public:
+
+ explicit Line(const _Line & line) noexcept : _line{line} {}
+
+ template<const _Line & ...xn>
+ static auto build() noexcept -> Line
+ {
+ return Line{_Line{
+ [](const std::string & p, const std::string & b) -> std::string
+ { return (... + xn[0](p, b)); },
+ [](const std::string & p, const std::string & b) -> std::string
+ { return (... + xn[1](p, b)); }
+ }};
+ }
+
+
+ [[nodiscard]] auto STR(const std::string & param, const std::string & begin)
+ const -> std::string
+ { return _line[0](param, begin); }
+
+
+ [[nodiscard]] auto RGX() const -> rgx::regex
+ { return rgx::regex{_line[1]("", "")}; }
+
+};
+
+
+auto get_if_missed(const std::string & conf, const Line & LINE,
+ const std::string & val,
+ const std::string & indent="\n ", bool compare=true)
+ -> std::string;
+
+
+auto delete_if(const std::string & conf, const rgx::regex & rgx,
+ const std::string & val="", bool compare=false)
+ -> std::string;
+
+
+void add_ssl_directives_to(const std::string & name, bool isdefault);
+
+
+void create_ssl_certificate(const std::string & crtpath,
+ const std::string & keypath,
+ int days=792);
+
+
+void use_cron_to_recreate_certificate(const std::string & name);
+
+
+void add_ssl_if_needed(const std::string & name);
+
+
+void del_ssl_directives_from(const std::string & name, bool isdefault);
+
+
+void del_ssl(const std::string & name);
+
+
+constexpr auto _begin = _Line{
+ [](const std::string & /*param*/, const std::string & begin) -> std::string
+ { return begin; },
+
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ { return R"([{;](?:\s*#[^\n]*(?=\n))*(\s*))"; }
+};
+
+
+constexpr auto _space = _Line{
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ { return std::string{" "}; },
+
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ { return R"(\s+)"; }
+};
+
+
+constexpr auto _newline = _Line{
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ { return std::string{"\n"}; },
+
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ { return std::string{"\n"}; }
+};
+
+
+constexpr auto _end = _Line{
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ { return std::string{";"}; },
+
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ { return std::string{R"(\s*;(?:[\t ]*#[^\n]*)?)"}; }
+};
+
+
+template<char clim='\0'>
+constexpr auto _capture = _Line{
+ [](const std::string & param, const std::string & /*begin*/) -> std::string
+ { return '\'' + param + '\''; },
+
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ {
+ const auto lim = clim=='\0' ? std::string{"\\s"} : std::string{clim};
+ return std::string{R"(((?:(?:"[^"]*")|(?:[^'")"} +
+ lim + "][^" + lim + "]*)|(?:'[^']*'))+)";
+ }
+};
+
+
+template<const std::string_view & strptr, char clim='\0'>
+constexpr auto _escape = _Line{
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ {
+ return clim=='\0' ?
+ std::string{strptr.data()} :
+ clim + std::string{strptr.data()} + clim;
+ },
+
+ [](const std::string & /*param*/, const std::string & /*begin*/)
+ -> std::string
+ {
+ std::string ret{};
+ for (char c : strptr) {
+ switch(c) {
+ case '^': ret += '\\'; [[fallthrough]];
+ case '_': [[fallthrough]];
+ case '-': ret += c;
+ break;
+ default:
+ if ((isalpha(c)!=0) || (isdigit(c)!=0)) { ret += c; }
+ else { ret += std::string{"["}+c+"]"; }
+ }
+ }
+ return "(?:"+ret+"|'"+ret+"'"+"|\""+ret+"\""+")";
+ }
+};
+
+
+constexpr std::string_view _server_name = "server_name";
+
+constexpr std::string_view _include = "include";
+
+constexpr std::string_view _ssl_certificate = "ssl_certificate";
+
+constexpr std::string_view _ssl_certificate_key = "ssl_certificate_key";
+
+constexpr std::string_view _ssl_session_cache = "ssl_session_cache";
+
+constexpr std::string_view _ssl_session_timeout = "ssl_session_timeout";
+
+
+// For a compile time regex lib, this must be fixed, use one of these options:
+// * Hand craft or macro concat them (loosing more or less flexibility).
+// * Use Macro concatenation of __VA_ARGS__ with the help of:
+// https://p99.gforge.inria.fr/p99-html/group__preprocessor__for.html
+// * Use constexpr---not available for strings or char * for now---look at lib.
+
+static const auto CRON_CMD = Line::build
+ < _space, _escape<NGINX_UTIL>, _space, _escape<ADD_SSL_FCT,'\''>, _space,
+ _capture<>, _newline >();
+
+static const auto NGX_SERVER_NAME =
+ Line::build<_begin, _escape<_server_name>, _space, _capture<';'>, _end>();
+
+static const auto NGX_INCLUDE_LAN_LISTEN = Line::build
+ <_begin, _escape<_include>, _space, _escape<LAN_LISTEN,'\''>, _end>();
+
+static const auto NGX_INCLUDE_LAN_LISTEN_DEFAULT = Line::build
+ < _begin, _escape<_include>, _space,
+ _escape<LAN_LISTEN_DEFAULT, '\''>, _end >();
+
+static const auto NGX_INCLUDE_LAN_SSL_LISTEN = Line::build
+ <_begin, _escape<_include>, _space, _escape<LAN_SSL_LISTEN, '\''>, _end>();
+
+static const auto NGX_INCLUDE_LAN_SSL_LISTEN_DEFAULT = Line::build
+ < _begin, _escape<_include>, _space,
+ _escape<LAN_SSL_LISTEN_DEFAULT, '\''>, _end >();
+
+static const auto NGX_SSL_CRT = Line::build
+ <_begin, _escape<_ssl_certificate>, _space, _capture<';'>, _end>();
+
+static const auto NGX_SSL_KEY = Line::build
+ <_begin, _escape<_ssl_certificate_key>, _space, _capture<';'>, _end>();
+
+static const auto NGX_SSL_SESSION_CACHE = Line::build
+ <_begin, _escape<_ssl_session_cache>, _space, _capture<';'>, _end>();
+
+static const auto NGX_SSL_SESSION_TIMEOUT = Line::build
+ <_begin, _escape<_ssl_session_timeout>, _space, _capture<';'>, _end>();
+
+
+auto get_if_missed(const std::string & conf, const Line & LINE,
+ const std::string & val,
+ const std::string & indent, bool compare)
+ -> std::string
+{
+ if (!compare || val.empty()) {
+ return rgx::regex_search(conf, LINE.RGX()) ? "" : LINE.STR(val, indent);
+ }
+
+ rgx::smatch match; // assuming last capture has the value!
+
+ for (auto pos = conf.begin();
+ rgx::regex_search(pos, conf.end(), match, LINE.RGX());
+ pos += match.position(0) + match.length(0))
+ {
+ const std::string value = match.str(match.size() - 1);
+
+ if (value==val || value=="'"+val+"'" || value=='"'+val+'"') {
+ return "";
+ }
+ }
+
+ return LINE.STR(val, indent);
+}
+
+
+auto delete_if(const std::string & conf, const rgx::regex & rgx,
+ const std::string & val, const bool compare)
+ -> std::string
+{
+ std::string ret{};
+ auto pos = conf.begin();
+
+ for (rgx::smatch match;
+ rgx::regex_search(pos, conf.end(), match, rgx);
+ pos += match.position(0) + match.length(0))
+ {
+ const std::string value = match.str(match.size() - 1);
+ auto len = match.position(1);
+ if (compare && value!=val && value!="'"+val+"'" && value!='"'+val+'"') {
+ len = match.position(0) + match.length(0);
+ }
+ ret.append(pos, pos + len);
+ }
+
+ ret.append(pos, conf.end());
+ return ret;
+}
+
+
+void add_ssl_directives_to(const std::string & name, const bool isdefault)
+{
+ const std::string prefix = std::string{CONF_DIR} + name;
+
+ std::string conf = read_file(prefix+".conf");
+
+ const std::string & const_conf = conf; // iteration needs const string.
+ rgx::smatch match; // captures str(1)=indentation spaces, str(2)=server name
+ for (auto pos = const_conf.begin();
+ rgx::regex_search(pos, const_conf.end(), match, NGX_SERVER_NAME.RGX());
+ pos += match.position(0) + match.length(0))
+ {
+ if (match.str(2).find(name) == std::string::npos) { continue; }
+
+ const std::string indent = match.str(1);
+
+ std::string adds = isdefault ?
+ get_if_missed(conf, NGX_INCLUDE_LAN_SSL_LISTEN_DEFAULT,"",indent) :
+ get_if_missed(conf, NGX_INCLUDE_LAN_SSL_LISTEN, "", indent);
+
+ adds += get_if_missed(conf, NGX_SSL_CRT, prefix+".crt", indent);
+
+ adds += get_if_missed(conf, NGX_SSL_KEY, prefix+".key", indent);
+
+ adds += get_if_missed(conf, NGX_SSL_SESSION_CACHE,
+ SSL_SESSION_CACHE_ARG(name), indent, false);
+
+ adds += get_if_missed(conf, NGX_SSL_SESSION_TIMEOUT,
+ std::string{SSL_SESSION_TIMEOUT_ARG}, indent, false);
+
+ if (adds.length() > 0) {
+ pos += match.position(0) + match.length(0);
+
+ conf = std::string(const_conf.begin(), pos) + adds +
+ std::string(pos, const_conf.end());
+
+ conf = isdefault ?
+ delete_if(conf, NGX_INCLUDE_LAN_LISTEN_DEFAULT.RGX()) :
+ delete_if(conf, NGX_INCLUDE_LAN_LISTEN.RGX());
+
+ write_file(prefix+".conf", conf);
+
+ std::cerr<<"Added SSL directives to "<<prefix<<".conf: ";
+ std::cerr<<adds<<std::endl;
+ }
+
+ return;
+ }
+
+ auto errmsg = std::string{"add_ssl_directives_to error: "};
+ errmsg += "cannot add SSL directives to " + name + ".conf, missing: ";
+ errmsg += NGX_SERVER_NAME.STR(name, "\n ") + "\n";
+ throw std::runtime_error(errmsg.c_str());
+}
+
+
+template<typename T>
+inline auto num2hex(T bytes) -> std::array<char, 2*sizeof(bytes)+1>
+{
+ constexpr auto n = 2*sizeof(bytes);
+ std::array<char, n+1> str{};
+
+ for (size_t i=0; i<n; ++i) {
+ static const std::array<char, 17> hex{"0123456789ABCDEF"};
+ static constexpr auto get = 0x0fU;
+ str.at(i) = hex.at(bytes & get);
+
+ static constexpr auto move = 4U;
+ bytes >>= move;
+ }
+
+ str[n] = '\0';
+ return str;
+}
+
+
+template<typename T>
+inline auto get_nonce(const T salt=0) -> T
+{
+ T nonce = 0;
+
+ std::ifstream urandom{"/dev/urandom"};
+
+ static constexpr auto move = 6U;
+
+ constexpr size_t steps = (sizeof(nonce)*8 - 1)/move + 1;
+
+ for (size_t i=0; i<steps; ++i) {
+ if (!urandom.good()) { throw std::runtime_error("get_nonce error"); }
+ nonce = (nonce << move) + static_cast<unsigned>(urandom.get());
+ }
+
+ nonce ^= salt;
+
+ return nonce;
+}
+
+
+void create_ssl_certificate(const std::string & crtpath,
+ const std::string & keypath,
+ const int days)
+{
+ size_t nonce = 0;
+
+ try { nonce = get_nonce(nonce); }
+
+ catch (...) { // the address of a variable should be random enough:
+ auto addr = &crtpath;
+ auto addrptr = static_cast<const size_t *>(
+ static_cast<const void *>(&addr) );
+ nonce += *addrptr;
+ }
+
+ auto noncestr = num2hex(nonce);
+
+ const auto tmpcrtpath = crtpath + ".new-" + noncestr.data();
+ const auto tmpkeypath = keypath + ".new-" + noncestr.data();
+
+ try {
+ auto pkey = gen_eckey(NID_secp384r1);
+
+ write_key(pkey, tmpkeypath);
+
+ std::string subject {"/C=ZZ/ST=Somewhere/L=None/CN=OpenWrt/O=OpenWrt"};
+ subject += noncestr.data();
+
+ selfsigned(pkey, days, subject, tmpcrtpath);
+
+ static constexpr auto to_seconds = 24*60*60;
+ static constexpr auto leeway = 42;
+ if (!checkend(tmpcrtpath, days*to_seconds - leeway)) {
+ throw std::runtime_error("bug: created certificate is not valid!!");
+ }
+
+ } catch (...) {
+ std::cerr<<"create_ssl_certificate error: ";
+ std::cerr<<"cannot create selfsigned certificate, ";
+ std::cerr<<"removing temporary files ..."<<std::endl;
+
+ if (remove(tmpcrtpath.c_str())!=0) {
+ auto errmsg = "\t cannot remove "+tmpcrtpath;
+ perror(errmsg.c_str());
+ }
+
+ if (remove(tmpkeypath.c_str())!=0) {
+ auto errmsg = "\t cannot remove "+tmpkeypath;
+ perror(errmsg.c_str());
+ }
+
+ throw;
+ }
+
+ if ( rename(tmpcrtpath.c_str(), crtpath.c_str())!=0 ||
+ rename(tmpkeypath.c_str(), keypath.c_str())!=0 )
+ {
+ auto errmsg = std::string{"create_ssl_certificate warning: "};
+ errmsg += "cannot move "+tmpcrtpath+" to "+crtpath;
+ errmsg += " or "+tmpkeypath+" to "+keypath+", continuing ... ";
+ perror(errmsg.c_str());
+ }
+
+}
+
+
+void use_cron_to_recreate_certificate(const std::string & name)
+{
+ static const char * filename = "/etc/crontabs/root";
+
+ std::string conf{};
+ try { conf = read_file(filename); }
+ catch (const std::ifstream::failure &) { /* is ok if not found, create. */ }
+
+ const std::string add = get_if_missed(conf, CRON_CMD, name);
+
+ if (add.length() > 0) {
+#ifndef NO_UBUS
+ auto service = ubus::call("service","list",UBUS_TIMEOUT).filter("cron");
+
+ if (!service) {
+ std::string errmsg{"use_cron_to_recreate_certificate error: "};
+ errmsg += "Cron unavailable to re-create the ssl certificate for ";
+ errmsg += name + "\n";
+ throw std::runtime_error(errmsg.c_str());
+ } // else active with or without instances:
+#endif
+
+ write_file(filename, std::string{CRON_INTERVAL}+add, std::ios::app);
+
+#ifndef NO_UBUS
+ call("/etc/init.d/cron", "reload");
+#endif
+
+ std::cerr<<"Rebuild the ssl certificate for '";
+ std::cerr<<name<<"' annually with cron."<<std::endl;
+ }
+}
+
+
+void add_ssl_if_needed(const std::string & name)
+{
+ add_ssl_directives_to(name, name==LAN_NAME); // let it throw.
+
+ const auto crtpath = std::string{CONF_DIR} + name + ".crt";
+ const auto keypath = std::string{CONF_DIR} + name + ".key";
+ constexpr auto remaining_seconds = (365 + 32)*24*60*60;
+ constexpr auto validity_days = 3*(365 + 31);
+
+ bool is_valid = true;
+
+ if (access(keypath.c_str(), R_OK) != 0 ||
+ access(crtpath.c_str(), R_OK) != 0)
+ { is_valid = false; }
+
+ else {
+ try {
+ if (!checkend(crtpath, remaining_seconds)) {
+ is_valid = false;
+ }
+ }
+ catch (...) { // something went wrong, maybe it is in DER format:
+ try {
+ if (!checkend(crtpath, remaining_seconds, false)) {
+ is_valid = false;
+ }
+ }
+ catch (...) { // it has neither DER nor PEM format, rebuild.
+ is_valid = false;
+ }
+ }
+ }
+
+ if (!is_valid) { create_ssl_certificate(crtpath, keypath, validity_days); }
+
+ try { use_cron_to_recreate_certificate(name); }
+ catch (...) {
+ std::cerr<<"add_ssl_if_needed warning: ";
+ std::cerr<<"cannot use cron to rebuild certificate for "<<name<<"\n";
+ }
+}
+
+
+void del_ssl_directives_from(const std::string & name, const bool isdefault)
+{
+ const std::string prefix = std::string{CONF_DIR} + name;
+
+ std::string conf = read_file(prefix+".conf");
+
+ const std::string & const_conf = conf; // iteration needs const string.
+ rgx::smatch match; // captures str(1)=indentation spaces, str(2)=server name
+ for (auto pos = const_conf.begin();
+ rgx::regex_search(pos, const_conf.end(), match, NGX_SERVER_NAME.RGX());
+ pos += match.position(0) + match.length(0))
+ {
+ if (match.str(2).find(name) == std::string::npos) { continue; }
+
+ const std::string indent = match.str(1);
+
+ std::string adds = isdefault ?
+ get_if_missed(conf, NGX_INCLUDE_LAN_LISTEN_DEFAULT,"",indent) :
+ get_if_missed(conf, NGX_INCLUDE_LAN_LISTEN, "", indent);
+
+ if (adds.length() > 0) {
+ pos += match.position(1);
+
+ conf = std::string(const_conf.begin(), pos) + adds
+ + std::string(pos, const_conf.end());
+
+ conf = isdefault ?
+ delete_if(conf, NGX_INCLUDE_LAN_SSL_LISTEN_DEFAULT.RGX())
+ : delete_if(conf, NGX_INCLUDE_LAN_SSL_LISTEN.RGX());
+
+ const auto crtpath = prefix+".crt";
+ conf = delete_if(conf, NGX_SSL_CRT.RGX(), crtpath, true);
+
+ const auto keypath = prefix+".key";
+ conf = delete_if(conf, NGX_SSL_KEY.RGX(), keypath, true);
+
+ conf = delete_if(conf, NGX_SSL_SESSION_CACHE.RGX());
+
+ conf = delete_if(conf, NGX_SSL_SESSION_TIMEOUT.RGX());
+
+ write_file(prefix+".conf", conf);
+
+ std::cerr<<"Deleted SSL directives from "<<prefix<<".conf\n";
+ }
+
+ return;
+ }
+
+ auto errmsg = std::string{"del_ssl_directives_from error: "};
+ errmsg += "cannot delete SSL directives from " + name + ".conf, missing: ";
+ errmsg += NGX_SERVER_NAME.STR(name, "\n ") + "\n";
+ throw std::runtime_error(errmsg.c_str());
+}
+
+
+void del_ssl(const std::string & name)
+{
+ static const char * filename = "/etc/crontabs/root";
+
+ try {
+ const auto const_conf = read_file(filename);
+
+ bool changed = false;
+ auto conf = std::string{};
+
+ size_t prev = 0;
+ size_t curr = 0;
+ while ((curr=const_conf.find('\n', prev)) != std::string::npos) {
+
+ auto line = const_conf.substr(prev, curr-prev+1);
+
+ if (line==delete_if(line,CRON_CMD.RGX(),std::string{name},true)) {
+ conf += line;
+ } else { changed = true; }
+
+ prev = curr + 1;
+ }
+
+ if (changed) {
+ write_file(filename, conf);
+
+ std::cerr<<"Do not rebuild the ssl certificate for '";
+ std::cerr<<name<<"' annually with cron anymore."<<std::endl;
+
+#ifndef NO_UBUS
+ if (ubus::call("service", "list", UBUS_TIMEOUT).filter("cron"))
+ { call("/etc/init.d/cron", "reload"); }
+#endif
+ }
+
+ } catch (...) {
+ std::cerr<<"del_ssl warning: ";
+ std::cerr<<"cannot delete cron job for "<<name<<" in "<<filename<<"\n";
+ }
+
+ try { del_ssl_directives_from(name, name==LAN_NAME); }
+ catch (...) {
+ std::cerr<<"del_ssl error: ";
+ std::cerr<<"cannot delete SSL directives from "<<name<<".conf\n";
+ throw;
+ }
+
+ const auto crtpath = std::string{CONF_DIR} + name + ".crt";
+
+ if (remove(crtpath.c_str())!=0) {
+ auto errmsg = "del_ssl warning: cannot remove "+crtpath;
+ perror(errmsg.c_str());
+ }
+
+ const auto keypath = std::string{CONF_DIR} + name + ".key";
+
+ if (remove(keypath.c_str())!=0) {
+ auto errmsg = "del_ssl warning: cannot remove "+keypath;
+ perror(errmsg.c_str());
+ }
+}
+
+
+#endif
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