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