methods/https.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: http.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $
   4 /* ######################################################################
   5
   6    HTTPS Acquire Method - This is the HTTPS aquire method for APT.
   7
   8    It uses libcurl
   9
  10    ##################################################################### */
  11                                                                         /*}}}*/
  12 // Include Files                                                        /*{{{*/
  13 #include <apt-pkg/fileutl.h>
  14 #include <apt-pkg/acquire-method.h>
  15 #include <apt-pkg/error.h>
  16 #include <apt-pkg/hashes.h>
  17
  18 #include <sys/stat.h>
  19 #include <sys/time.h>
  20 #include <utime.h>
  21 #include <unistd.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <iostream>
  27 #include <apti18n.h>
  28 #include <sstream>
  29
  30 #include "config.h"
  31 #include "https.h"
  32
  33                                                                         /*}}}*/
  34 using namespace std;
  35
  36 size_t
  37 HttpsMethod::write_data(void *buffer, size_t size, size_t nmemb, void *userp)
  38 {
  39    HttpsMethod *me = (HttpsMethod *)userp;
  40
  41    if(me->File->Write(buffer, size*nmemb) != true)
  42       return false;
  43
  44    return size*nmemb;
  45 }
  46
  47 int
  48 HttpsMethod::progress_callback(void *clientp, double dltotal, double dlnow,
  49                               double ultotal, double ulnow)
  50 {
  51    HttpsMethod *me = (HttpsMethod *)clientp;
  52    if(dltotal > 0 && me->Res.Size == 0) {
  53       me->Res.Size = (unsigned long)dltotal;
  54       me->URIStart(me->Res);
  55    }
  56    return 0;
  57 }
  58
  59 void HttpsMethod::SetupProxy()
  60 {
  61    URI ServerName = Queue->Uri;
  62
  63    // Determine the proxy setting
  64    string SpecificProxy = _config->Find("Acquire::http::Proxy::" + ServerName.Host);
  65    if (!SpecificProxy.empty())
  66    {
  67            if (SpecificProxy == "DIRECT")
  68                    Proxy = "";
  69            else
  70                    Proxy = SpecificProxy;
  71    }
  72    else
  73    {
  74            string DefProxy = _config->Find("Acquire::http::Proxy");
  75            if (!DefProxy.empty())
  76            {
  77                    Proxy = DefProxy;
  78            }
  79            else
  80            {
  81                    char* result = getenv("http_proxy");
  82                    Proxy = result ? result : "";
  83            }
  84    }
  85
  86    // Parse no_proxy, a , separated list of domains
  87    if (getenv("no_proxy") != 0)
  88    {
  89       if (CheckDomainList(ServerName.Host,getenv("no_proxy")) == true)
  90          Proxy = "";
  91    }
  92
  93    // Determine what host and port to use based on the proxy settings
  94    string Host;
  95    if (Proxy.empty() == true || Proxy.Host.empty() == true)
  96    {
  97    }
  98    else
  99    {
 100       if (Proxy.Port != 0)
 101          curl_easy_setopt(curl, CURLOPT_PROXYPORT, Proxy.Port);
 102       curl_easy_setopt(curl, CURLOPT_PROXY, Proxy.Host.c_str());
 103    }
 104 }
 105
 106
 107 // HttpsMethod::Fetch - Fetch an item                                   /*{{{*/
 108 // ---------------------------------------------------------------------
 109 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 110    depth. */
 111 bool HttpsMethod::Fetch(FetchItem *Itm)
 112 {
 113    stringstream ss;
 114    struct stat SBuf;
 115    struct curl_slist *headers=NULL;
 116    char curl_errorstr[CURL_ERROR_SIZE];
 117    long curl_responsecode;
 118    URI Uri = Itm->Uri;
 119    string remotehost = Uri.Host;
 120
 121    // TODO:
 122    //       - http::Pipeline-Depth
 123    //       - error checking/reporting
 124    //       - more debug options? (CURLOPT_DEBUGFUNCTION?)
 125
 126    curl_easy_reset(curl);
 127    SetupProxy();
 128
 129    // callbacks
 130    curl_easy_setopt(curl, CURLOPT_URL, Itm->Uri.c_str());
 131    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
 132    curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
 133    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);
 134    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, this);
 135    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, false);
 136    curl_easy_setopt(curl, CURLOPT_FAILONERROR, true);
 137    curl_easy_setopt(curl, CURLOPT_FILETIME, true);
 138
 139    // SSL parameters are set by default to the common (non mirror-specific) value
 140    // if available (or a default one) and gets overload by mirror-specific ones.
 141
 142    // File containing the list of trusted CA.
 143    string cainfo = _config->Find("Acquire::https::CaInfo","");
 144    string knob = "Acquire::https::"+remotehost+"::CaInfo";
 145    cainfo = _config->Find(knob.c_str(),cainfo.c_str());
 146    if(cainfo != "")
 147       curl_easy_setopt(curl, CURLOPT_CAINFO,cainfo.c_str());
 148
 149    // Check server certificate against previous CA list ...
 150    bool peer_verify = _config->FindB("Acquire::https::Verify-Peer",true);
 151    knob = "Acquire::https::" + remotehost + "::Verify-Peer";
 152    peer_verify = _config->FindB(knob.c_str(), peer_verify);
 153    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, peer_verify);
 154
 155    // ... and hostname against cert CN or subjectAltName
 156    int default_verify = 2;
 157    bool verify = _config->FindB("Acquire::https::Verify-Host",true);
 158    knob = "Acquire::https::"+remotehost+"::Verify-Host";
 159    verify = _config->FindB(knob.c_str(),verify);
 160    if (!verify)
 161       default_verify = 0;
 162    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, verify);
 163
 164    // For client authentication, certificate file ...
 165    string pem = _config->Find("Acquire::https::SslCert","");
 166    knob = "Acquire::https::"+remotehost+"::SslCert";
 167    pem = _config->Find(knob.c_str(),pem.c_str());
 168    if(pem != "")
 169       curl_easy_setopt(curl, CURLOPT_SSLCERT, pem.c_str());
 170
 171    // ... and associated key.
 172    string key = _config->Find("Acquire::https::SslKey","");
 173    knob = "Acquire::https::"+remotehost+"::SslKey";
 174    key = _config->Find(knob.c_str(),key.c_str());
 175    if(key != "")
 176       curl_easy_setopt(curl, CURLOPT_SSLKEY, key.c_str());
 177
 178    // Allow forcing SSL version to SSLv3 or TLSv1 (SSLv2 is not
 179    // supported by GnuTLS).
 180    long final_version = CURL_SSLVERSION_DEFAULT;
 181    string sslversion = _config->Find("Acquire::https::SslForceVersion","");
 182    knob = "Acquire::https::"+remotehost+"::SslForceVersion";
 183    sslversion = _config->Find(knob.c_str(),sslversion.c_str());
 184    if(sslversion == "TLSv1")
 185      final_version = CURL_SSLVERSION_TLSv1;
 186    else if(sslversion == "SSLv3")
 187      final_version = CURL_SSLVERSION_SSLv3;
 188    curl_easy_setopt(curl, CURLOPT_SSLVERSION, final_version);
 189
 190    // cache-control
 191    if(_config->FindB("Acquire::http::No-Cache",false) == false)
 192    {
 193       // cache enabled
 194       if (_config->FindB("Acquire::http::No-Store",false) == true)
 195          headers = curl_slist_append(headers,"Cache-Control: no-store");
 196       ioprintf(ss, "Cache-Control: max-age=%u", _config->FindI("Acquire::http::Max-Age",0));
 197       headers = curl_slist_append(headers, ss.str().c_str());
 198    } else {
 199       // cache disabled by user
 200       headers = curl_slist_append(headers, "Cache-Control: no-cache");
 201       headers = curl_slist_append(headers, "Pragma: no-cache");
 202    }
 203    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
 204
 205    // speed limit
 206    int dlLimit = _config->FindI("Acquire::http::Dl-Limit",0)*1024;
 207    if (dlLimit > 0)
 208       curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, dlLimit);
 209
 210    // set header
 211    curl_easy_setopt(curl, CURLOPT_USERAGENT,"Debian APT-CURL/1.0 ("VERSION")");
 212
 213    // set timeout
 214    int timeout = _config->FindI("Acquire::http::Timeout",120);
 215    curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, timeout);
 216    //set really low lowspeed timeout (see #497983)
 217    int dlMin = 1;
 218    curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, dlMin);
 219    curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, timeout);
 220
 221    // set redirect options and default to 10 redirects
 222    bool AllowRedirect = _config->FindI("Acquire::https::AllowRedirect", true);
 223    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, AllowRedirect);
 224    curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10);
 225
 226    // debug
 227    if(_config->FindB("Debug::Acquire::https", false))
 228       curl_easy_setopt(curl, CURLOPT_VERBOSE, true);
 229
 230    // error handling
 231    curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 232
 233    // if we have the file send an if-range query with a range header
 234    if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 235    {
 236       char Buf[1000];
 237       sprintf(Buf,"Range: bytes=%li-\r\nIf-Range: %s\r\n",
 238               (long)SBuf.st_size - 1,
 239               TimeRFC1123(SBuf.st_mtime).c_str());
 240       headers = curl_slist_append(headers, Buf);
 241    }
 242    else if(Itm->LastModified > 0)
 243    {
 244       curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
 245       curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified);
 246    }
 247
 248    // go for it - if the file exists, append on it
 249    File = new FileFd(Itm->DestFile, FileFd::WriteAny);
 250    if (File->Size() > 0)
 251       File->Seek(File->Size() - 1);
 252
 253    // keep apt updated
 254    Res.Filename = Itm->DestFile;
 255
 256    // get it!
 257    CURLcode success = curl_easy_perform(curl);
 258    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &curl_responsecode);
 259
 260    long curl_servdate;
 261    curl_easy_getinfo(curl, CURLINFO_FILETIME, &curl_servdate);
 262
 263    // cleanup
 264    if(success != 0)
 265    {
 266       _error->Error("%s", curl_errorstr);
 267       Fail();
 268       return true;
 269    }
 270    File->Close();
 271
 272    // Timestamp
 273    struct utimbuf UBuf;
 274    if (curl_servdate != -1) {
 275        UBuf.actime = curl_servdate;
 276        UBuf.modtime = curl_servdate;
 277        utime(File->Name().c_str(),&UBuf);
 278    }
 279
 280    // check the downloaded result
 281    struct stat Buf;
 282    if (stat(File->Name().c_str(),&Buf) == 0)
 283    {
 284       Res.Filename = File->Name();
 285       Res.LastModified = Buf.st_mtime;
 286       Res.IMSHit = false;
 287       if (curl_responsecode == 304)
 288       {
 289          unlink(File->Name().c_str());
 290          Res.IMSHit = true;
 291          Res.LastModified = Itm->LastModified;
 292          Res.Size = 0;
 293          URIDone(Res);
 294          return true;
 295       }
 296       Res.Size = Buf.st_size;
 297    }
 298
 299    // take hashes
 300    Hashes Hash;
 301    FileFd Fd(Res.Filename, FileFd::ReadOnly);
 302    Hash.AddFD(Fd.Fd(), Fd.Size());
 303    Res.TakeHashes(Hash);
 304
 305    // keep apt updated
 306    URIDone(Res);
 307
 308    // cleanup
 309    Res.Size = 0;
 310    delete File;
 311    curl_slist_free_all(headers);
 312
 313    return true;
 314 };
 315
 316 int main()
 317 {
 318    setlocale(LC_ALL, "");
 319
 320    HttpsMethod Mth;
 321    curl_global_init(CURL_GLOBAL_SSL) ;
 322
 323    return Mth.Run();
 324 }
 325
 326