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 <config.h>
  14
  15 #include <apt-pkg/fileutl.h>
  16 #include <apt-pkg/acquire-method.h>
  17 #include <apt-pkg/error.h>
  18 #include <apt-pkg/hashes.h>
  19 #include <apt-pkg/netrc.h>
  20 #include <apt-pkg/configuration.h>
  21
  22 #include <sys/stat.h>
  23 #include <sys/time.h>
  24 #include <utime.h>
  25 #include <unistd.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <errno.h>
  29 #include <string.h>
  30 #include <iostream>
  31 #include <sstream>
  32
  33 #include "config.h"
  34 #include "https.h"
  35 #include <apti18n.h>
  36                                                                         /*}}}*/
  37 using namespace std;
  38
  39 size_t
  40 HttpsMethod::write_data(void *buffer, size_t size, size_t nmemb, void *userp)
  41 {
  42    HttpsMethod *me = (HttpsMethod *)userp;
  43
  44    if(me->File->Write(buffer, size*nmemb) != true)
  45       return false;
  46
  47    return size*nmemb;
  48 }
  49
  50 int
  51 HttpsMethod::progress_callback(void *clientp, double dltotal, double dlnow,
  52                               double ultotal, double ulnow)
  53 {
  54    HttpsMethod *me = (HttpsMethod *)clientp;
  55    if(dltotal > 0 && me->Res.Size == 0) {
  56       me->Res.Size = (unsigned long long)dltotal;
  57       me->URIStart(me->Res);
  58    }
  59    return 0;
  60 }
  61
  62 void HttpsMethod::SetupProxy()                                          /*{{{*/
  63 {
  64    URI ServerName = Queue->Uri;
  65
  66    // Curl should never read proxy settings from the environment, as
  67    // we determine which proxy to use.  Do this for consistency among
  68    // methods and prevent an environment variable overriding a
  69    // no-proxy ("DIRECT") setting in apt.conf.
  70    curl_easy_setopt(curl, CURLOPT_PROXY, "");
  71
  72    // Determine the proxy setting - try https first, fallback to http and use env at last
  73    string UseProxy = _config->Find("Acquire::https::Proxy::" + ServerName.Host,
  74                                    _config->Find("Acquire::http::Proxy::" + ServerName.Host).c_str());
  75
  76    if (UseProxy.empty() == true)
  77       UseProxy = _config->Find("Acquire::https::Proxy", _config->Find("Acquire::http::Proxy").c_str());
  78
  79    // User want to use NO proxy, so nothing to setup
  80    if (UseProxy == "DIRECT")
  81       return;
  82
  83    if (UseProxy.empty() == false)
  84    {
  85       // Parse no_proxy, a comma (,) separated list of domains we don't want to use
  86       // a proxy for so we stop right here if it is in the list
  87       if (getenv("no_proxy") != 0 && CheckDomainList(ServerName.Host,getenv("no_proxy")) == true)
  88          return;
  89    } else {
  90       const char* result = getenv("https_proxy");
  91       // FIXME: Fall back to http_proxy is to remain compatible with
  92       // existing setups and behaviour of apt.conf.  This should be
  93       // deprecated in the future (including apt.conf).  Most other
  94       // programs do not fall back to http proxy settings and neither
  95       // should Apt.
  96       if (result == NULL)
  97          result = getenv("http_proxy");
  98       UseProxy = result == NULL ? "" : result;
  99    }
 100
 101    // Determine what host and port to use based on the proxy settings
 102    if (UseProxy.empty() == false)
 103    {
 104       Proxy = UseProxy;
 105       if (Proxy.Port != 1)
 106          curl_easy_setopt(curl, CURLOPT_PROXYPORT, Proxy.Port);
 107       curl_easy_setopt(curl, CURLOPT_PROXY, Proxy.Host.c_str());
 108       if (Proxy.User.empty() == false || Proxy.Password.empty() == false)
 109       {
 110          curl_easy_setopt(curl, CURLOPT_PROXYUSERNAME, Proxy.User.c_str());
 111          curl_easy_setopt(curl, CURLOPT_PROXYPASSWORD, Proxy.Password.c_str());
 112       }
 113    }
 114 }                                                                       /*}}}*/
 115 // HttpsMethod::Fetch - Fetch an item                                   /*{{{*/
 116 // ---------------------------------------------------------------------
 117 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 118    depth. */
 119 bool HttpsMethod::Fetch(FetchItem *Itm)
 120 {
 121    struct stat SBuf;
 122    struct curl_slist *headers=NULL;
 123    char curl_errorstr[CURL_ERROR_SIZE];
 124    long curl_responsecode;
 125    URI Uri = Itm->Uri;
 126    string remotehost = Uri.Host;
 127
 128    // TODO:
 129    //       - http::Pipeline-Depth
 130    //       - error checking/reporting
 131    //       - more debug options? (CURLOPT_DEBUGFUNCTION?)
 132
 133    curl_easy_reset(curl);
 134    SetupProxy();
 135
 136    maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc"));
 137
 138    // callbacks
 139    curl_easy_setopt(curl, CURLOPT_URL, static_cast<string>(Uri).c_str());
 140    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
 141    curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
 142    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);
 143    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, this);
 144    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, false);
 145    curl_easy_setopt(curl, CURLOPT_FILETIME, true);
 146
 147    // SSL parameters are set by default to the common (non mirror-specific) value
 148    // if available (or a default one) and gets overload by mirror-specific ones.
 149
 150    // File containing the list of trusted CA.
 151    string cainfo = _config->Find("Acquire::https::CaInfo","");
 152    string knob = "Acquire::https::"+remotehost+"::CaInfo";
 153    cainfo = _config->Find(knob.c_str(),cainfo.c_str());
 154    if(cainfo.empty() == false)
 155       curl_easy_setopt(curl, CURLOPT_CAINFO,cainfo.c_str());
 156
 157    // Check server certificate against previous CA list ...
 158    bool peer_verify = _config->FindB("Acquire::https::Verify-Peer",true);
 159    knob = "Acquire::https::" + remotehost + "::Verify-Peer";
 160    peer_verify = _config->FindB(knob.c_str(), peer_verify);
 161    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, peer_verify);
 162
 163    // ... and hostname against cert CN or subjectAltName
 164    bool verify = _config->FindB("Acquire::https::Verify-Host",true);
 165    knob = "Acquire::https::"+remotehost+"::Verify-Host";
 166    verify = _config->FindB(knob.c_str(),verify);
 167    int const default_verify = (verify == true) ? 2 : 0;
 168    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, default_verify);
 169
 170    // Also enforce issuer of server certificate using its cert
 171    string issuercert = _config->Find("Acquire::https::IssuerCert","");
 172    knob = "Acquire::https::"+remotehost+"::IssuerCert";
 173    issuercert = _config->Find(knob.c_str(),issuercert.c_str());
 174    if(issuercert.empty() == false)
 175       curl_easy_setopt(curl, CURLOPT_ISSUERCERT,issuercert.c_str());
 176
 177    // For client authentication, certificate file ...
 178    string pem = _config->Find("Acquire::https::SslCert","");
 179    knob = "Acquire::https::"+remotehost+"::SslCert";
 180    pem = _config->Find(knob.c_str(),pem.c_str());
 181    if(pem.empty() == false)
 182       curl_easy_setopt(curl, CURLOPT_SSLCERT, pem.c_str());
 183
 184    // ... and associated key.
 185    string key = _config->Find("Acquire::https::SslKey","");
 186    knob = "Acquire::https::"+remotehost+"::SslKey";
 187    key = _config->Find(knob.c_str(),key.c_str());
 188    if(key.empty() == false)
 189       curl_easy_setopt(curl, CURLOPT_SSLKEY, key.c_str());
 190
 191    // Allow forcing SSL version to SSLv3 or TLSv1 (SSLv2 is not
 192    // supported by GnuTLS).
 193    long final_version = CURL_SSLVERSION_DEFAULT;
 194    string sslversion = _config->Find("Acquire::https::SslForceVersion","");
 195    knob = "Acquire::https::"+remotehost+"::SslForceVersion";
 196    sslversion = _config->Find(knob.c_str(),sslversion.c_str());
 197    if(sslversion == "TLSv1")
 198      final_version = CURL_SSLVERSION_TLSv1;
 199    else if(sslversion == "SSLv3")
 200      final_version = CURL_SSLVERSION_SSLv3;
 201    curl_easy_setopt(curl, CURLOPT_SSLVERSION, final_version);
 202
 203    // CRL file
 204    string crlfile = _config->Find("Acquire::https::CrlFile","");
 205    knob = "Acquire::https::"+remotehost+"::CrlFile";
 206    crlfile = _config->Find(knob.c_str(),crlfile.c_str());
 207    if(crlfile.empty() == false)
 208       curl_easy_setopt(curl, CURLOPT_CRLFILE, crlfile.c_str());
 209
 210    // cache-control
 211    if(_config->FindB("Acquire::https::No-Cache",
 212         _config->FindB("Acquire::http::No-Cache",false)) == false)
 213    {
 214       // cache enabled
 215       if (_config->FindB("Acquire::https::No-Store",
 216                 _config->FindB("Acquire::http::No-Store",false)) == true)
 217          headers = curl_slist_append(headers,"Cache-Control: no-store");
 218       stringstream ss;
 219       ioprintf(ss, "Cache-Control: max-age=%u", _config->FindI("Acquire::https::Max-Age",
 220                 _config->FindI("Acquire::http::Max-Age",0)));
 221       headers = curl_slist_append(headers, ss.str().c_str());
 222    } else {
 223       // cache disabled by user
 224       headers = curl_slist_append(headers, "Cache-Control: no-cache");
 225       headers = curl_slist_append(headers, "Pragma: no-cache");
 226    }
 227    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
 228
 229    // speed limit
 230    int const dlLimit = _config->FindI("Acquire::https::Dl-Limit",
 231                 _config->FindI("Acquire::http::Dl-Limit",0))*1024;
 232    if (dlLimit > 0)
 233       curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, dlLimit);
 234
 235    // set header
 236    curl_easy_setopt(curl, CURLOPT_USERAGENT,
 237         _config->Find("Acquire::https::User-Agent",
 238                 _config->Find("Acquire::http::User-Agent",
 239                         "Debian APT-CURL/1.0 (" PACKAGE_VERSION ")").c_str()).c_str());
 240
 241    // set timeout
 242    int const timeout = _config->FindI("Acquire::https::Timeout",
 243                 _config->FindI("Acquire::http::Timeout",120));
 244    curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, timeout);
 245    //set really low lowspeed timeout (see #497983)
 246    curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, DL_MIN_SPEED);
 247    curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, timeout);
 248
 249    // set redirect options and default to 10 redirects
 250    bool const AllowRedirect = _config->FindB("Acquire::https::AllowRedirect",
 251         _config->FindB("Acquire::http::AllowRedirect",true));
 252    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, AllowRedirect);
 253    curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10);
 254
 255    // debug
 256    if(_config->FindB("Debug::Acquire::https", false))
 257       curl_easy_setopt(curl, CURLOPT_VERBOSE, true);
 258
 259    // error handling
 260    curl_errorstr[0] = '\0';
 261    curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 262
 263    // If we ask for uncompressed files servers might respond with content-
 264    // negotation which lets us end up with compressed files we do not support,
 265    // see 657029, 657560 and co, so if we have no extension on the request
 266    // ask for text only. As a sidenote: If there is nothing to negotate servers
 267    // seem to be nice and ignore it.
 268    if (_config->FindB("Acquire::https::SendAccept", _config->FindB("Acquire::http::SendAccept", true)) == true)
 269    {
 270       size_t const filepos = Itm->Uri.find_last_of('/');
 271       string const file = Itm->Uri.substr(filepos + 1);
 272       if (flExtension(file) == file)
 273          headers = curl_slist_append(headers, "Accept: text/*");
 274    }
 275
 276    // if we have the file send an if-range query with a range header
 277    if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 278    {
 279       char Buf[1000];
 280       sprintf(Buf, "Range: bytes=%li-", (long) SBuf.st_size - 1);
 281       headers = curl_slist_append(headers, Buf);
 282       sprintf(Buf, "If-Range: %s", TimeRFC1123(SBuf.st_mtime).c_str());
 283       headers = curl_slist_append(headers, Buf);
 284    }
 285    else if(Itm->LastModified > 0)
 286    {
 287       curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
 288       curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified);
 289    }
 290
 291    // go for it - if the file exists, append on it
 292    File = new FileFd(Itm->DestFile, FileFd::WriteAny);
 293    if (File->Size() > 0)
 294       File->Seek(File->Size() - 1);
 295
 296    // keep apt updated
 297    Res.Filename = Itm->DestFile;
 298
 299    // get it!
 300    CURLcode success = curl_easy_perform(curl);
 301    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &curl_responsecode);
 302
 303    long curl_servdate;
 304    curl_easy_getinfo(curl, CURLINFO_FILETIME, &curl_servdate);
 305
 306    // If the server returns 200 OK but the If-Modified-Since condition is not
 307    // met, CURLINFO_CONDITION_UNMET will be set to 1
 308    long curl_condition_unmet = 0;
 309    curl_easy_getinfo(curl, CURLINFO_CONDITION_UNMET, &curl_condition_unmet);
 310
 311    File->Close();
 312
 313    // cleanup
 314    if(success != 0 || (curl_responsecode != 200 && curl_responsecode != 304))
 315    {
 316       _error->Error("%s", curl_errorstr);
 317       // unlink, no need keep 401/404 page content in partial/
 318       unlink(File->Name().c_str());
 319       Fail();
 320       return true;
 321    }
 322
 323    // Timestamp
 324    struct utimbuf UBuf;
 325    if (curl_servdate != -1) {
 326        UBuf.actime = curl_servdate;
 327        UBuf.modtime = curl_servdate;
 328        utime(File->Name().c_str(),&UBuf);
 329    }
 330
 331    // check the downloaded result
 332    struct stat Buf;
 333    if (stat(File->Name().c_str(),&Buf) == 0)
 334    {
 335       Res.Filename = File->Name();
 336       Res.LastModified = Buf.st_mtime;
 337       Res.IMSHit = false;
 338       if (curl_responsecode == 304 || curl_condition_unmet)
 339       {
 340          unlink(File->Name().c_str());
 341          Res.IMSHit = true;
 342          Res.LastModified = Itm->LastModified;
 343          Res.Size = 0;
 344          URIDone(Res);
 345          return true;
 346       }
 347       Res.Size = Buf.st_size;
 348    }
 349
 350    // take hashes
 351    Hashes Hash;
 352    FileFd Fd(Res.Filename, FileFd::ReadOnly);
 353    Hash.AddFD(Fd);
 354    Res.TakeHashes(Hash);
 355
 356    // keep apt updated
 357    URIDone(Res);
 358
 359    // cleanup
 360    Res.Size = 0;
 361    delete File;
 362    curl_slist_free_all(headers);
 363
 364    return true;
 365 };
 366
 367 int main()
 368 {
 369    setlocale(LC_ALL, "");
 370
 371    HttpsMethod Mth;
 372    curl_global_init(CURL_GLOBAL_SSL) ;
 373
 374    return Mth.Run();
 375 }
 376
 377