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