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    // For client authentication, certificate file ...
 155    string pem = _config->Find("Acquire::https::SslCert","");
 156    knob = "Acquire::https::"+remotehost+"::SslCert";
 157    pem = _config->Find(knob.c_str(),pem.c_str());
 158    if(pem != "")
 159       curl_easy_setopt(curl, CURLOPT_SSLCERT, pem.c_str());
 160
 161    // ... and associated key.
 162    string key = _config->Find("Acquire::https::SslKey","");
 163    knob = "Acquire::https::"+remotehost+"::SslKey";
 164    key = _config->Find(knob.c_str(),key.c_str());
 165    if(key != "")
 166       curl_easy_setopt(curl, CURLOPT_SSLKEY, key.c_str());
 167
 168    // Allow forcing SSL version to SSLv3 or TLSv1 (SSLv2 is not
 169    // supported by GnuTLS).
 170    long final_version = CURL_SSLVERSION_DEFAULT;
 171    string sslversion = _config->Find("Acquire::https::SslForceVersion","");
 172    knob = "Acquire::https::"+remotehost+"::SslForceVersion";
 173    sslversion = _config->Find(knob.c_str(),sslversion.c_str());
 174    if(sslversion == "TLSv1")
 175      final_version = CURL_SSLVERSION_TLSv1;
 176    else if(sslversion == "SSLv3")
 177      final_version = CURL_SSLVERSION_SSLv3;
 178    curl_easy_setopt(curl, CURLOPT_SSLVERSION, final_version);
 179
 180    // cache-control
 181    if(_config->FindB("Acquire::https::No-Cache",
 182         _config->FindB("Acquire::http::No-Cache",false)) == false)
 183    {
 184       // cache enabled
 185       if (_config->FindB("Acquire::https::No-Store",
 186                 _config->FindB("Acquire::http::No-Store",false)) == true)
 187          headers = curl_slist_append(headers,"Cache-Control: no-store");
 188       ioprintf(ss, "Cache-Control: max-age=%u", _config->FindI("Acquire::https::Max-Age",
 189                 _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::https::Dl-Limit",
 200                 _config->FindI("Acquire::http::Dl-Limit",0))*1024;
 201    if (dlLimit > 0)
 202       curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, dlLimit);
 203
 204    // set header
 205    curl_easy_setopt(curl, CURLOPT_USERAGENT,
 206         _config->Find("Acquire::https::User-Agent",
 207                 _config->Find("Acquire::http::User-Agent",
 208                         "Debian APT-CURL/1.0 ("VERSION")").c_str()).c_str());
 209
 210    // set timeout
 211    int timeout = _config->FindI("Acquire::https::Timeout",
 212                 _config->FindI("Acquire::http::Timeout",120));
 213    curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, timeout);
 214    //set really low lowspeed timeout (see #497983)
 215    curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, DL_MIN_SPEED);
 216    curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, timeout);
 217
 218    // set redirect options and default to 10 redirects
 219    bool AllowRedirect = _config->FindB("Acquire::https::AllowRedirect",
 220         _config->FindB("Acquire::http::AllowRedirect",true));
 221    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, AllowRedirect);
 222    curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10);
 223
 224    // debug
 225    if(_config->FindB("Debug::Acquire::https", false))
 226       curl_easy_setopt(curl, CURLOPT_VERBOSE, true);
 227
 228    // error handling
 229    curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 230
 231    // if we have the file send an if-range query with a range header
 232    if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 233    {
 234       char Buf[1000];
 235       sprintf(Buf,"Range: bytes=%li-\r\nIf-Range: %s\r\n",
 236               (long)SBuf.st_size - 1,
 237               TimeRFC1123(SBuf.st_mtime).c_str());
 238       headers = curl_slist_append(headers, Buf);
 239    }
 240    else if(Itm->LastModified > 0)
 241    {
 242       curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
 243       curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified);
 244    }
 245
 246    // go for it - if the file exists, append on it
 247    File = new FileFd(Itm->DestFile, FileFd::WriteAny);
 248    if (File->Size() > 0)
 249       File->Seek(File->Size() - 1);
 250
 251    // keep apt updated
 252    Res.Filename = Itm->DestFile;
 253
 254    // get it!
 255    CURLcode success = curl_easy_perform(curl);
 256    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &curl_responsecode);
 257
 258    long curl_servdate;
 259    curl_easy_getinfo(curl, CURLINFO_FILETIME, &curl_servdate);
 260
 261    // cleanup
 262    if(success != 0)
 263    {
 264       _error->Error("%s", curl_errorstr);
 265       Fail();
 266       return true;
 267    }
 268    File->Close();
 269
 270    // Timestamp
 271    struct utimbuf UBuf;
 272    if (curl_servdate != -1) {
 273        UBuf.actime = curl_servdate;
 274        UBuf.modtime = curl_servdate;
 275        utime(File->Name().c_str(),&UBuf);
 276    }
 277
 278    // check the downloaded result
 279    struct stat Buf;
 280    if (stat(File->Name().c_str(),&Buf) == 0)
 281    {
 282       Res.Filename = File->Name();
 283       Res.LastModified = Buf.st_mtime;
 284       Res.IMSHit = false;
 285       if (curl_responsecode == 304)
 286       {
 287          unlink(File->Name().c_str());
 288          Res.IMSHit = true;
 289          Res.LastModified = Itm->LastModified;
 290          Res.Size = 0;
 291          URIDone(Res);
 292          return true;
 293       }
 294       Res.Size = Buf.st_size;
 295    }
 296
 297    // take hashes
 298    Hashes Hash;
 299    FileFd Fd(Res.Filename, FileFd::ReadOnly);
 300    Hash.AddFD(Fd.Fd(), Fd.Size());
 301    Res.TakeHashes(Hash);
 302
 303    // keep apt updated
 304    URIDone(Res);
 305
 306    // cleanup
 307    Res.Size = 0;
 308    delete File;
 309    curl_slist_free_all(headers);
 310
 311    return true;
 312 };
 313
 314 int main()
 315 {
 316    setlocale(LC_ALL, "");
 317
 318    HttpsMethod Mth;
 319    curl_global_init(CURL_GLOBAL_SSL) ;
 320
 321    return Mth.Run();
 322 }
 323
 324