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 {
  62    URI ServerName = Queue->Uri;
  63
  64    // Determine the proxy setting - try https first, fallback to http and use env at last
  65    string UseProxy = _config->Find("Acquire::https::Proxy::" + ServerName.Host,
  66                                    _config->Find("Acquire::http::Proxy::" + ServerName.Host).c_str());
  67
  68    if (UseProxy.empty() == true)
  69       UseProxy = _config->Find("Acquire::https::Proxy", _config->Find("Acquire::http::Proxy").c_str());
  70
  71    // User want to use NO proxy, so nothing to setup
  72    if (UseProxy == "DIRECT")
  73       return;
  74
  75    if (UseProxy.empty() == false)
  76    {
  77       // Parse no_proxy, a comma (,) separated list of domains we don't want to use
  78       // a proxy for so we stop right here if it is in the list
  79       if (getenv("no_proxy") != 0 && CheckDomainList(ServerName.Host,getenv("no_proxy")) == true)
  80          return;
  81    } else {
  82       const char* result = getenv("http_proxy");
  83       UseProxy = result == NULL ? "" : result;
  84    }
  85
  86    // Determine what host and port to use based on the proxy settings
  87    if (UseProxy.empty() == false)
  88    {
  89       Proxy = UseProxy;
  90       if (Proxy.Port != 1)
  91          curl_easy_setopt(curl, CURLOPT_PROXYPORT, Proxy.Port);
  92       curl_easy_setopt(curl, CURLOPT_PROXY, Proxy.Host.c_str());
  93    }
  94 }                                                                       /*}}}*/
  95 // HttpsMethod::Fetch - Fetch an item                                   /*{{{*/
  96 // ---------------------------------------------------------------------
  97 /* This adds an item to the pipeline. We keep the pipeline at a fixed
  98    depth. */
  99 bool HttpsMethod::Fetch(FetchItem *Itm)
 100 {
 101    stringstream ss;
 102    struct stat SBuf;
 103    struct curl_slist *headers=NULL;
 104    char curl_errorstr[CURL_ERROR_SIZE];
 105    long curl_responsecode;
 106    URI Uri = Itm->Uri;
 107    string remotehost = Uri.Host;
 108
 109    // TODO:
 110    //       - http::Pipeline-Depth
 111    //       - error checking/reporting
 112    //       - more debug options? (CURLOPT_DEBUGFUNCTION?)
 113
 114    curl_easy_reset(curl);
 115    SetupProxy();
 116
 117    maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc"));
 118
 119    // callbacks
 120    curl_easy_setopt(curl, CURLOPT_URL, static_cast<string>(Uri).c_str());
 121    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
 122    curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
 123    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);
 124    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, this);
 125    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, false);
 126    curl_easy_setopt(curl, CURLOPT_FAILONERROR, true);
 127    curl_easy_setopt(curl, CURLOPT_FILETIME, true);
 128
 129    // SSL parameters are set by default to the common (non mirror-specific) value
 130    // if available (or a default one) and gets overload by mirror-specific ones.
 131
 132    // File containing the list of trusted CA.
 133    string cainfo = _config->Find("Acquire::https::CaInfo","");
 134    string knob = "Acquire::https::"+remotehost+"::CaInfo";
 135    cainfo = _config->Find(knob.c_str(),cainfo.c_str());
 136    if(cainfo != "")
 137       curl_easy_setopt(curl, CURLOPT_CAINFO,cainfo.c_str());
 138
 139    // Check server certificate against previous CA list ...
 140    bool peer_verify = _config->FindB("Acquire::https::Verify-Peer",true);
 141    knob = "Acquire::https::" + remotehost + "::Verify-Peer";
 142    peer_verify = _config->FindB(knob.c_str(), peer_verify);
 143    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, peer_verify);
 144
 145    // ... and hostname against cert CN or subjectAltName
 146    int default_verify = 2;
 147    bool verify = _config->FindB("Acquire::https::Verify-Host",true);
 148    knob = "Acquire::https::"+remotehost+"::Verify-Host";
 149    verify = _config->FindB(knob.c_str(),verify);
 150    if (!verify)
 151       default_verify = 0;
 152    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, verify);
 153
 154    // Also enforce issuer of server certificate using its cert
 155    string issuercert = _config->Find("Acquire::https::IssuerCert","");
 156    knob = "Acquire::https::"+remotehost+"::IssuerCert";
 157    issuercert = _config->Find(knob.c_str(),issuercert.c_str());
 158    if(issuercert != "")
 159       curl_easy_setopt(curl, CURLOPT_ISSUERCERT,issuercert.c_str());
 160
 161    // For client authentication, certificate file ...
 162    string pem = _config->Find("Acquire::https::SslCert","");
 163    knob = "Acquire::https::"+remotehost+"::SslCert";
 164    pem = _config->Find(knob.c_str(),pem.c_str());
 165    if(pem != "")
 166       curl_easy_setopt(curl, CURLOPT_SSLCERT, pem.c_str());
 167
 168    // ... and associated key.
 169    string key = _config->Find("Acquire::https::SslKey","");
 170    knob = "Acquire::https::"+remotehost+"::SslKey";
 171    key = _config->Find(knob.c_str(),key.c_str());
 172    if(key != "")
 173       curl_easy_setopt(curl, CURLOPT_SSLKEY, key.c_str());
 174
 175    // Allow forcing SSL version to SSLv3 or TLSv1 (SSLv2 is not
 176    // supported by GnuTLS).
 177    long final_version = CURL_SSLVERSION_DEFAULT;
 178    string sslversion = _config->Find("Acquire::https::SslForceVersion","");
 179    knob = "Acquire::https::"+remotehost+"::SslForceVersion";
 180    sslversion = _config->Find(knob.c_str(),sslversion.c_str());
 181    if(sslversion == "TLSv1")
 182      final_version = CURL_SSLVERSION_TLSv1;
 183    else if(sslversion == "SSLv3")
 184      final_version = CURL_SSLVERSION_SSLv3;
 185    curl_easy_setopt(curl, CURLOPT_SSLVERSION, final_version);
 186
 187    // CRL file
 188    string crlfile = _config->Find("Acquire::https::CrlFile","");
 189    knob = "Acquire::https::"+remotehost+"::CrlFile";
 190    crlfile = _config->Find(knob.c_str(),crlfile.c_str());
 191    if(crlfile != "")
 192       curl_easy_setopt(curl, CURLOPT_CRLFILE, crlfile.c_str());
 193
 194    // cache-control
 195    if(_config->FindB("Acquire::https::No-Cache",
 196         _config->FindB("Acquire::http::No-Cache",false)) == false)
 197    {
 198       // cache enabled
 199       if (_config->FindB("Acquire::https::No-Store",
 200                 _config->FindB("Acquire::http::No-Store",false)) == true)
 201          headers = curl_slist_append(headers,"Cache-Control: no-store");
 202       ioprintf(ss, "Cache-Control: max-age=%u", _config->FindI("Acquire::https::Max-Age",
 203                 _config->FindI("Acquire::http::Max-Age",0)));
 204       headers = curl_slist_append(headers, ss.str().c_str());
 205    } else {
 206       // cache disabled by user
 207       headers = curl_slist_append(headers, "Cache-Control: no-cache");
 208       headers = curl_slist_append(headers, "Pragma: no-cache");
 209    }
 210    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
 211
 212    // speed limit
 213    int dlLimit = _config->FindI("Acquire::https::Dl-Limit",
 214                 _config->FindI("Acquire::http::Dl-Limit",0))*1024;
 215    if (dlLimit > 0)
 216       curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, dlLimit);
 217
 218    // set header
 219    curl_easy_setopt(curl, CURLOPT_USERAGENT,
 220         _config->Find("Acquire::https::User-Agent",
 221                 _config->Find("Acquire::http::User-Agent",
 222                         "Debian APT-CURL/1.0 ("VERSION")").c_str()).c_str());
 223
 224    // set timeout
 225    int timeout = _config->FindI("Acquire::https::Timeout",
 226                 _config->FindI("Acquire::http::Timeout",120));
 227    curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, timeout);
 228    //set really low lowspeed timeout (see #497983)
 229    curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, DL_MIN_SPEED);
 230    curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, timeout);
 231
 232    // set redirect options and default to 10 redirects
 233    bool AllowRedirect = _config->FindB("Acquire::https::AllowRedirect",
 234         _config->FindB("Acquire::http::AllowRedirect",true));
 235    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, AllowRedirect);
 236    curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10);
 237
 238    // debug
 239    if(_config->FindB("Debug::Acquire::https", false))
 240       curl_easy_setopt(curl, CURLOPT_VERBOSE, true);
 241
 242    // error handling
 243    curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 244
 245    // if we have the file send an if-range query with a range header
 246    if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 247    {
 248       char Buf[1000];
 249       sprintf(Buf,"Range: bytes=%li-\r\nIf-Range: %s\r\n",
 250               (long)SBuf.st_size - 1,
 251               TimeRFC1123(SBuf.st_mtime).c_str());
 252       headers = curl_slist_append(headers, Buf);
 253    }
 254    else if(Itm->LastModified > 0)
 255    {
 256       curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
 257       curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified);
 258    }
 259
 260    // go for it - if the file exists, append on it
 261    File = new FileFd(Itm->DestFile, FileFd::WriteAny);
 262    if (File->Size() > 0)
 263       File->Seek(File->Size() - 1);
 264
 265    // keep apt updated
 266    Res.Filename = Itm->DestFile;
 267
 268    // get it!
 269    CURLcode success = curl_easy_perform(curl);
 270    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &curl_responsecode);
 271
 272    long curl_servdate;
 273    curl_easy_getinfo(curl, CURLINFO_FILETIME, &curl_servdate);
 274
 275    // cleanup
 276    if(success != 0)
 277    {
 278       _error->Error("%s", curl_errorstr);
 279       Fail();
 280       return true;
 281    }
 282    File->Close();
 283
 284    // Timestamp
 285    struct utimbuf UBuf;
 286    if (curl_servdate != -1) {
 287        UBuf.actime = curl_servdate;
 288        UBuf.modtime = curl_servdate;
 289        utime(File->Name().c_str(),&UBuf);
 290    }
 291
 292    // check the downloaded result
 293    struct stat Buf;
 294    if (stat(File->Name().c_str(),&Buf) == 0)
 295    {
 296       Res.Filename = File->Name();
 297       Res.LastModified = Buf.st_mtime;
 298       Res.IMSHit = false;
 299       if (curl_responsecode == 304)
 300       {
 301          unlink(File->Name().c_str());
 302          Res.IMSHit = true;
 303          Res.LastModified = Itm->LastModified;
 304          Res.Size = 0;
 305          URIDone(Res);
 306          return true;
 307       }
 308       Res.Size = Buf.st_size;
 309    }
 310
 311    // take hashes
 312    Hashes Hash;
 313    FileFd Fd(Res.Filename, FileFd::ReadOnly);
 314    Hash.AddFD(Fd.Fd(), Fd.Size());
 315    Res.TakeHashes(Hash);
 316
 317    // keep apt updated
 318    URIDone(Res);
 319
 320    // cleanup
 321    Res.Size = 0;
 322    delete File;
 323    curl_slist_free_all(headers);
 324
 325    return true;
 326 };
 327
 328 int main()
 329 {
 330    setlocale(LC_ALL, "");
 331
 332    HttpsMethod Mth;
 333    curl_global_init(CURL_GLOBAL_SSL) ;
 334
 335    return Mth.Run();
 336 }
 337
 338