X-Git-Url: https://git.stg.codes/stg.git/blobdiff_plain/a6680ce3d763763a6010c81c8a5a8f7a1ce052db..8c6fa3fbaccc22127280bf77a48fab5a3ee0716e:/projects/stargazer/plugins/other/radius/conn.cpp

diff --git a/projects/stargazer/plugins/other/radius/conn.cpp b/projects/stargazer/plugins/other/radius/conn.cpp
new file mode 100644
index 00000000..a209409b
--- /dev/null
+++ b/projects/stargazer/plugins/other/radius/conn.cpp
@@ -0,0 +1,527 @@
+/*
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ *    Author : Maxim Mamontov <faust@stargazer.dp.ua>
+ */
+
+#include "conn.h"
+
+#include "radius.h"
+#include "config.h"
+
+#include "stg/json_parser.h"
+#include "stg/json_generator.h"
+#include "stg/users.h"
+#include "stg/user.h"
+#include "stg/logger.h"
+#include "stg/common.h"
+
+#include <yajl/yajl_gen.h>
+
+#include <map>
+#include <stdexcept>
+#include <cstring>
+#include <cerrno>
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+using STG::Conn;
+using STG::Config;
+using STG::JSON::Parser;
+using STG::JSON::PairsParser;
+using STG::JSON::EnumParser;
+using STG::JSON::NodeParser;
+using STG::JSON::Gen;
+using STG::JSON::MapGen;
+using STG::JSON::StringGen;
+
+namespace
+{
+
+double CONN_TIMEOUT = 60;
+double PING_TIMEOUT = 10;
+
+enum Packet
+{
+    PING,
+    PONG,
+    DATA
+};
+
+enum Stage
+{
+    AUTHORIZE,
+    AUTHENTICATE,
+    PREACCT,
+    ACCOUNTING,
+    POSTAUTH
+};
+
+std::map<std::string, Packet> packetCodes;
+std::map<std::string, Stage> stageCodes;
+
+class PacketParser : public EnumParser<Packet>
+{
+    public:
+        PacketParser(NodeParser* next, Packet& packet, std::string& packetStr)
+            : EnumParser(next, packet, packetStr, packetCodes)
+        {
+            if (!packetCodes.empty())
+                return;
+            packetCodes["ping"] = PING;
+            packetCodes["pong"] = PONG;
+            packetCodes["data"] = DATA;
+        }
+};
+
+class StageParser : public EnumParser<Stage>
+{
+    public:
+        StageParser(NodeParser* next, Stage& stage, std::string& stageStr)
+            : EnumParser(next, stage, stageStr, stageCodes)
+        {
+            if (!stageCodes.empty())
+                return;
+            stageCodes["authorize"] = AUTHORIZE;
+            stageCodes["authenticate"] = AUTHENTICATE;
+            stageCodes["preacct"] = PREACCT;
+            stageCodes["accounting"] = ACCOUNTING;
+            stageCodes["postauth"] = POSTAUTH;
+        }
+};
+
+class TopParser : public NodeParser
+{
+    public:
+        typedef void (*Callback) (void* /*data*/);
+        TopParser(Callback callback, void* data)
+            : m_packetParser(this, m_packet, m_packetStr),
+              m_stageParser(this, m_stage, m_stageStr),
+              m_pairsParser(this, m_data),
+              m_callback(callback), m_callbackData(data)
+        {}
+
+        virtual NodeParser* parseStartMap() { return this; }
+        virtual NodeParser* parseMapKey(const std::string& value)
+        {
+            std::string key = ToLower(value);
+
+            if (key == "packet")
+                return &m_packetParser;
+            else if (key == "stage")
+                return &m_stageParser;
+            else if (key == "pairs")
+                return &m_pairsParser;
+
+            return this;
+        }
+        virtual NodeParser* parseEndMap() { m_callback(m_callbackData); return this; }
+
+        const std::string& packetStr() const { return m_packetStr; }
+        Packet packet() const { return m_packet; }
+        const std::string& stageStr() const { return m_stageStr; }
+        Stage stage() const { return m_stage; }
+        const Config::Pairs& data() const { return m_data; }
+
+    private:
+        std::string m_packetStr;
+        Packet m_packet;
+        std::string m_stageStr;
+        Stage m_stage;
+        Config::Pairs m_data;
+
+        PacketParser m_packetParser;
+        StageParser m_stageParser;
+        PairsParser m_pairsParser;
+
+        Callback m_callback;
+        void* m_callbackData;
+};
+
+class ProtoParser : public Parser
+{
+    public:
+        ProtoParser(TopParser::Callback callback, void* data)
+            : Parser( &m_topParser ),
+              m_topParser(callback, data)
+        {}
+
+        const std::string& packetStr() const { return m_topParser.packetStr(); }
+        Packet packet() const { return m_topParser.packet(); }
+        const std::string& stageStr() const { return m_topParser.stageStr(); }
+        Stage stage() const { return m_topParser.stage(); }
+        const Config::Pairs& data() const { return m_topParser.data(); }
+
+    private:
+        TopParser m_topParser;
+};
+
+class PacketGen : public Gen
+{
+    public:
+        PacketGen(const std::string& type)
+            : m_type(type)
+        {
+            m_gen.add("packet", m_type);
+        }
+        void run(yajl_gen_t* handle) const
+        {
+            m_gen.run(handle);
+        }
+        PacketGen& add(const std::string& key, const std::string& value)
+        {
+            m_gen.add(key, new StringGen(value));
+            return *this;
+        }
+        PacketGen& add(const std::string& key, MapGen* map)
+        {
+            m_gen.add(key, map);
+            return *this;
+        }
+        PacketGen& add(const std::string& key, MapGen& map)
+        {
+            m_gen.add(key, map);
+            return *this;
+        }
+    private:
+        MapGen m_gen;
+        StringGen m_type;
+};
+
+std::string toString(Config::ReturnCode code)
+{
+    switch (code)
+    {
+        case Config::REJECT:   return "reject";
+        case Config::FAIL:     return "fail";
+        case Config::OK:       return "ok";
+        case Config::HANDLED:  return "handled";
+        case Config::INVALID:  return "invalid";
+        case Config::USERLOCK: return "userlock";
+        case Config::NOTFOUND: return "notfound";
+        case Config::NOOP:     return "noop";
+        case Config::UPDATED:  return "noop";
+    }
+    return "reject";
+}
+
+}
+
+class Conn::Impl
+{
+    public:
+        Impl(USERS& users, PLUGIN_LOGGER& logger, RADIUS& plugin, const Config& config, int fd, const std::string& remote);
+        ~Impl();
+
+        int sock() const { return m_sock; }
+
+        bool read();
+        bool tick();
+
+        bool isOk() const { return m_ok; }
+
+    private:
+        USERS& m_users;
+        PLUGIN_LOGGER& m_logger;
+        RADIUS& m_plugin;
+        const Config& m_config;
+        int m_sock;
+        std::string m_remote;
+        bool m_ok;
+        time_t m_lastPing;
+        time_t m_lastActivity;
+        ProtoParser m_parser;
+        std::set<std::string> m_authorized;
+
+        template <typename T>
+        const T& stageMember(T Config::Section::* member) const
+        {
+            switch (m_parser.stage())
+            {
+                case AUTHORIZE: return m_config.autz.*member;
+                case AUTHENTICATE: return m_config.auth.*member;
+                case POSTAUTH: return m_config.postauth.*member;
+                case PREACCT: return m_config.preacct.*member;
+                case ACCOUNTING: return m_config.acct.*member;
+            }
+            throw std::runtime_error("Invalid stage: '" + m_parser.stageStr() + "'.");
+        }
+
+        const Config::Pairs& match() const { return stageMember(&Config::Section::match); }
+        const Config::Pairs& modify() const { return stageMember(&Config::Section::modify); }
+        const Config::Pairs& reply() const { return stageMember(&Config::Section::reply); }
+        Config::ReturnCode returnCode() const { return stageMember(&Config::Section::returnCode); }
+        const Config::Authorize& authorize() const { return stageMember(&Config::Section::authorize); }
+
+        static void process(void* data);
+        void processPing();
+        void processPong();
+        void processData();
+        bool answer(const USER& user);
+        bool answerNo();
+        bool sendPing();
+        bool sendPong();
+
+        static bool write(void* data, const char* buf, size_t size);
+};
+
+Conn::Conn(USERS& users, PLUGIN_LOGGER& logger, RADIUS& plugin, const Config& config, int fd, const std::string& remote)
+    : m_impl(new Impl(users, logger, plugin, config, fd, remote))
+{
+}
+
+Conn::~Conn()
+{
+}
+
+int Conn::sock() const
+{
+    return m_impl->sock();
+}
+
+bool Conn::read()
+{
+    return m_impl->read();
+}
+
+bool Conn::tick()
+{
+    return m_impl->tick();
+}
+
+bool Conn::isOk() const
+{
+    return m_impl->isOk();
+}
+
+Conn::Impl::Impl(USERS& users, PLUGIN_LOGGER& logger, RADIUS& plugin, const Config& config, int fd, const std::string& remote)
+    : m_users(users),
+      m_logger(logger),
+      m_plugin(plugin),
+      m_config(config),
+      m_sock(fd),
+      m_remote(remote),
+      m_ok(true),
+      m_lastPing(time(NULL)),
+      m_lastActivity(m_lastPing),
+      m_parser(&Conn::Impl::process, this)
+{
+}
+
+Conn::Impl::~Impl()
+{
+    close(m_sock);
+
+    std::set<std::string>::const_iterator it = m_authorized.begin();
+    for (; it != m_authorized.end(); ++it)
+        m_plugin.unauthorize(*it, "Lost connection to RADIUS server " + m_remote + ".");
+}
+
+bool Conn::Impl::read()
+{
+    static std::vector<char> buffer(1024);
+    ssize_t res = ::read(m_sock, buffer.data(), buffer.size());
+    if (res < 0)
+    {
+        m_logger("Failed to read data from '" + m_remote + "': " + strerror(errno));
+        m_ok = false;
+        return false;
+    }
+    printfd(__FILE__, "Read %d bytes.\n%s\n", res, std::string(buffer.data(), res).c_str());
+    m_lastActivity = time(NULL);
+    if (res == 0)
+    {
+        m_ok = false;
+        return true;
+    }
+    return m_parser.append(buffer.data(), res);
+}
+
+bool Conn::Impl::tick()
+{
+    time_t now = time(NULL);
+    if (difftime(now, m_lastActivity) > CONN_TIMEOUT)
+    {
+        int delta = difftime(now, m_lastActivity);
+        printfd(__FILE__, "Connection to '%s' timed out: %d sec.\n", m_remote.c_str(), delta);
+        m_logger("Connection to " + m_remote + " timed out.");
+        m_ok = false;
+        return false;
+    }
+    if (difftime(now, m_lastPing) > PING_TIMEOUT)
+    {
+        int delta = difftime(now, m_lastPing);
+        printfd(__FILE__, "Ping timeout: %d sec. Sending ping...\n", delta);
+        sendPing();
+    }
+    return true;
+}
+
+void Conn::Impl::process(void* data)
+{
+    Impl& impl = *static_cast<Impl*>(data);
+    try
+    {
+        switch (impl.m_parser.packet())
+        {
+            case PING:
+                impl.processPing();
+                return;
+            case PONG:
+                impl.processPong();
+                return;
+            case DATA:
+                impl.processData();
+                return;
+        }
+    }
+    catch (const std::exception& ex)
+    {
+        printfd(__FILE__, "Processing error. %s", ex.what());
+        impl.m_logger("Processing error. %s", ex.what());
+    }
+    printfd(__FILE__, "Received invalid packet type: '%s'.\n", impl.m_parser.packetStr().c_str());
+    impl.m_logger("Received invalid packet type: " + impl.m_parser.packetStr());
+}
+
+void Conn::Impl::processPing()
+{
+    printfd(__FILE__, "Got ping. Sending pong...\n");
+    sendPong();
+}
+
+void Conn::Impl::processPong()
+{
+    printfd(__FILE__, "Got pong.\n");
+    m_lastActivity = time(NULL);
+}
+
+void Conn::Impl::processData()
+{
+    printfd(__FILE__, "Got data.\n");
+    int handle = m_users.OpenSearch();
+
+    USER_PTR user = NULL;
+    bool matched = false;
+    while (m_users.SearchNext(handle, &user) == 0)
+    {
+        if (user == NULL)
+            continue;
+
+        matched = true;
+        for (Config::Pairs::const_iterator it = match().begin(); it != match().end(); ++it)
+        {
+            Config::Pairs::const_iterator pos = m_parser.data().find(it->first);
+            if (pos == m_parser.data().end())
+            {
+                matched = false;
+                break;
+            }
+            if (user->GetParamValue(it->second) != pos->second)
+            {
+                matched = false;
+                break;
+            }
+        }
+        if (!matched)
+            continue;
+        answer(*user);
+        if (authorize().check(*user, m_parser.data()))
+        {
+            m_plugin.authorize(*user);
+            m_authorized.insert(user->GetLogin());
+        }
+        break;
+    }
+
+    if (!matched)
+        answerNo();
+
+    m_users.CloseSearch(handle);
+}
+
+bool Conn::Impl::answer(const USER& user)
+{
+    printfd(__FILE__, "Got match. Sending answer...\n");
+    MapGen replyData;
+    for (Config::Pairs::const_iterator it = reply().begin(); it != reply().end(); ++it)
+        replyData.add(it->first, new StringGen(user.GetParamValue(it->second)));
+
+    MapGen modifyData;
+    for (Config::Pairs::const_iterator it = modify().begin(); it != modify().end(); ++it)
+        modifyData.add(it->first, new StringGen(user.GetParamValue(it->second)));
+
+    PacketGen gen("data");
+    gen.add("result", "ok")
+       .add("reply", replyData)
+       .add("modify", modifyData);
+
+    m_lastPing = time(NULL);
+
+    return generate(gen, &Conn::Impl::write, this);
+}
+
+bool Conn::Impl::answerNo()
+{
+    printfd(__FILE__, "No match. Sending answer...\n");
+    PacketGen gen("data");
+    gen.add("result", "no");
+    gen.add("return_code", toString(returnCode()));
+
+    m_lastPing = time(NULL);
+
+    return generate(gen, &Conn::Impl::write, this);
+}
+
+bool Conn::Impl::sendPing()
+{
+    PacketGen gen("ping");
+
+    m_lastPing = time(NULL);
+
+    return generate(gen, &Conn::Impl::write, this);
+}
+
+bool Conn::Impl::sendPong()
+{
+    PacketGen gen("pong");
+
+    m_lastPing = time(NULL);
+
+    return generate(gen, &Conn::Impl::write, this);
+}
+
+bool Conn::Impl::write(void* data, const char* buf, size_t size)
+{
+    std::string json(buf, size);
+    printfd(__FILE__, "Writing JSON:\n%s\n", json.c_str());
+    Conn::Impl& conn = *static_cast<Conn::Impl*>(data);
+    while (size > 0)
+    {
+        ssize_t res = ::send(conn.m_sock, buf, size, MSG_NOSIGNAL);
+        if (res < 0)
+        {
+            conn.m_logger("Failed to write pong to '" + conn.m_remote + "': " + strerror(errno));
+            conn.m_ok = false;
+            return false;
+        }
+        size -= res;
+    }
+    return true;
+}