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//-*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: http.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $
/* ######################################################################
HTTPS Acquire Method - This is the HTTPS acquire method for APT.
It uses libcurl
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include <config.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/error.h>
#include <apt-pkg/hashes.h>
#include <apt-pkg/netrc.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/macros.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/proxy.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <sstream>
#include <ctype.h>
#include <stdlib.h>
#include "https.h"
#include <apti18n.h>
/*}}}*/
using namespace std;
size_t
HttpsMethod::parse_header(void *buffer, size_t size, size_t nmemb, void *userp)
{
size_t len = size * nmemb;
HttpsMethod *me = (HttpsMethod *)userp;
std::string line((char*) buffer, len);
for (--len; len > 0; --len)
if (isspace(line[len]) == 0)
{
++len;
break;
}
line.erase(len);
if (line.empty() == true)
{
if (me->Server->Result != 416 && me->Server->StartPos != 0)
;
else if (me->Server->Result == 416 && me->Server->Size == me->File->FileSize())
{
me->Server->Result = 200;
me->Server->StartPos = me->Server->Size;
}
else
me->Server->StartPos = 0;
me->File->Truncate(me->Server->StartPos);
me->File->Seek(me->Server->StartPos);
}
else if (me->Server->HeaderLine(line) == false)
return 0;
return size*nmemb;
}
size_t
HttpsMethod::write_data(void *buffer, size_t size, size_t nmemb, void *userp)
{
HttpsMethod *me = (HttpsMethod *)userp;
if (me->Res.Size == 0)
me->URIStart(me->Res);
if(me->File->Write(buffer, size*nmemb) != true)
return false;
return size*nmemb;
}
int
HttpsMethod::progress_callback(void *clientp, double dltotal, double /*dlnow*/,
double /*ultotal*/, double /*ulnow*/)
{
HttpsMethod *me = (HttpsMethod *)clientp;
if(dltotal > 0 && me->Res.Size == 0) {
me->Res.Size = (unsigned long long)dltotal;
}
return 0;
}
// HttpsServerState::HttpsServerState - Constructor /*{{{*/
HttpsServerState::HttpsServerState(URI Srv,HttpsMethod * /*Owner*/) : ServerState(Srv, NULL)
{
TimeOut = _config->FindI("Acquire::https::Timeout",TimeOut);
Reset();
}
/*}}}*/
void HttpsMethod::SetupProxy() /*{{{*/
{
URI ServerName = Queue->Uri;
// Determine the proxy setting
AutoDetectProxy(ServerName);
// Curl should never read proxy settings from the environment, as
// we determine which proxy to use. Do this for consistency among
// methods and prevent an environment variable overriding a
// no-proxy ("DIRECT") setting in apt.conf.
curl_easy_setopt(curl, CURLOPT_PROXY, "");
// Determine the proxy setting - try https first, fallback to http and use env at last
string UseProxy = _config->Find("Acquire::https::Proxy::" + ServerName.Host,
_config->Find("Acquire::http::Proxy::" + ServerName.Host).c_str());
if (UseProxy.empty() == true)
UseProxy = _config->Find("Acquire::https::Proxy", _config->Find("Acquire::http::Proxy").c_str());
// User want to use NO proxy, so nothing to setup
if (UseProxy == "DIRECT")
return;
if (UseProxy.empty() == false)
{
// Parse no_proxy, a comma (,) separated list of domains we don't want to use
// a proxy for so we stop right here if it is in the list
if (getenv("no_proxy") != 0 && CheckDomainList(ServerName.Host,getenv("no_proxy")) == true)
return;
} else {
const char* result = getenv("https_proxy");
// FIXME: Fall back to http_proxy is to remain compatible with
// existing setups and behaviour of apt.conf. This should be
// deprecated in the future (including apt.conf). Most other
// programs do not fall back to http proxy settings and neither
// should Apt.
if (result == NULL)
result = getenv("http_proxy");
UseProxy = result == NULL ? "" : result;
}
// Determine what host and port to use based on the proxy settings
if (UseProxy.empty() == false)
{
Proxy = UseProxy;
if (Proxy.Port != 1)
curl_easy_setopt(curl, CURLOPT_PROXYPORT, Proxy.Port);
curl_easy_setopt(curl, CURLOPT_PROXY, Proxy.Host.c_str());
if (Proxy.User.empty() == false || Proxy.Password.empty() == false)
{
curl_easy_setopt(curl, CURLOPT_PROXYUSERNAME, Proxy.User.c_str());
curl_easy_setopt(curl, CURLOPT_PROXYPASSWORD, Proxy.Password.c_str());
}
}
} /*}}}*/
// HttpsMethod::Fetch - Fetch an item /*{{{*/
// ---------------------------------------------------------------------
/* This adds an item to the pipeline. We keep the pipeline at a fixed
depth. */
bool HttpsMethod::Fetch(FetchItem *Itm)
{
struct stat SBuf;
struct curl_slist *headers=NULL;
char curl_errorstr[CURL_ERROR_SIZE];
URI Uri = Itm->Uri;
string remotehost = Uri.Host;
// TODO:
// - http::Pipeline-Depth
// - error checking/reporting
// - more debug options? (CURLOPT_DEBUGFUNCTION?)
curl_easy_reset(curl);
SetupProxy();
maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc"));
// callbacks
curl_easy_setopt(curl, CURLOPT_URL, static_cast<string>(Uri).c_str());
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, parse_header);
curl_easy_setopt(curl, CURLOPT_WRITEHEADER, this);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);
curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, this);
// options
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, false);
curl_easy_setopt(curl, CURLOPT_FILETIME, true);
// only allow curl to handle https, not the other stuff it supports
curl_easy_setopt(curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTPS);
curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTPS);
// SSL parameters are set by default to the common (non mirror-specific) value
// if available (or a default one) and gets overload by mirror-specific ones.
// File containing the list of trusted CA.
string cainfo = _config->Find("Acquire::https::CaInfo","");
string knob = "Acquire::https::"+remotehost+"::CaInfo";
cainfo = _config->Find(knob.c_str(),cainfo.c_str());
if(cainfo.empty() == false)
curl_easy_setopt(curl, CURLOPT_CAINFO,cainfo.c_str());
// Check server certificate against previous CA list ...
bool peer_verify = _config->FindB("Acquire::https::Verify-Peer",true);
knob = "Acquire::https::" + remotehost + "::Verify-Peer";
peer_verify = _config->FindB(knob.c_str(), peer_verify);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, peer_verify);
// ... and hostname against cert CN or subjectAltName
bool verify = _config->FindB("Acquire::https::Verify-Host",true);
knob = "Acquire::https::"+remotehost+"::Verify-Host";
verify = _config->FindB(knob.c_str(),verify);
int const default_verify = (verify == true) ? 2 : 0;
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, default_verify);
// Also enforce issuer of server certificate using its cert
string issuercert = _config->Find("Acquire::https::IssuerCert","");
knob = "Acquire::https::"+remotehost+"::IssuerCert";
issuercert = _config->Find(knob.c_str(),issuercert.c_str());
if(issuercert.empty() == false)
curl_easy_setopt(curl, CURLOPT_ISSUERCERT,issuercert.c_str());
// For client authentication, certificate file ...
string pem = _config->Find("Acquire::https::SslCert","");
knob = "Acquire::https::"+remotehost+"::SslCert";
pem = _config->Find(knob.c_str(),pem.c_str());
if(pem.empty() == false)
curl_easy_setopt(curl, CURLOPT_SSLCERT, pem.c_str());
// ... and associated key.
string key = _config->Find("Acquire::https::SslKey","");
knob = "Acquire::https::"+remotehost+"::SslKey";
key = _config->Find(knob.c_str(),key.c_str());
if(key.empty() == false)
curl_easy_setopt(curl, CURLOPT_SSLKEY, key.c_str());
// Allow forcing SSL version to SSLv3 or TLSv1 (SSLv2 is not
// supported by GnuTLS).
long final_version = CURL_SSLVERSION_DEFAULT;
string sslversion = _config->Find("Acquire::https::SslForceVersion","");
knob = "Acquire::https::"+remotehost+"::SslForceVersion";
sslversion = _config->Find(knob.c_str(),sslversion.c_str());
if(sslversion == "TLSv1")
final_version = CURL_SSLVERSION_TLSv1;
else if(sslversion == "SSLv3")
final_version = CURL_SSLVERSION_SSLv3;
curl_easy_setopt(curl, CURLOPT_SSLVERSION, final_version);
// CRL file
string crlfile = _config->Find("Acquire::https::CrlFile","");
knob = "Acquire::https::"+remotehost+"::CrlFile";
crlfile = _config->Find(knob.c_str(),crlfile.c_str());
if(crlfile.empty() == false)
curl_easy_setopt(curl, CURLOPT_CRLFILE, crlfile.c_str());
// cache-control
if(_config->FindB("Acquire::https::No-Cache",
_config->FindB("Acquire::http::No-Cache",false)) == false)
{
// cache enabled
if (_config->FindB("Acquire::https::No-Store",
_config->FindB("Acquire::http::No-Store",false)) == true)
headers = curl_slist_append(headers,"Cache-Control: no-store");
stringstream ss;
ioprintf(ss, "Cache-Control: max-age=%u", _config->FindI("Acquire::https::Max-Age",
_config->FindI("Acquire::http::Max-Age",0)));
headers = curl_slist_append(headers, ss.str().c_str());
} else {
// cache disabled by user
headers = curl_slist_append(headers, "Cache-Control: no-cache");
headers = curl_slist_append(headers, "Pragma: no-cache");
}
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
// speed limit
int const dlLimit = _config->FindI("Acquire::https::Dl-Limit",
_config->FindI("Acquire::http::Dl-Limit",0))*1024;
if (dlLimit > 0)
curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, dlLimit);
// set header
curl_easy_setopt(curl, CURLOPT_USERAGENT,
_config->Find("Acquire::https::User-Agent",
_config->Find("Acquire::http::User-Agent",
"Debian APT-CURL/1.0 (" PACKAGE_VERSION ")").c_str()).c_str());
// set timeout
int const timeout = _config->FindI("Acquire::https::Timeout",
_config->FindI("Acquire::http::Timeout",120));
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, timeout);
//set really low lowspeed timeout (see #497983)
curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, DL_MIN_SPEED);
curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, timeout);
// set redirect options and default to 10 redirects
bool const AllowRedirect = _config->FindB("Acquire::https::AllowRedirect",
_config->FindB("Acquire::http::AllowRedirect",true));
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, AllowRedirect);
curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10);
// debug
if(_config->FindB("Debug::Acquire::https", false))
curl_easy_setopt(curl, CURLOPT_VERBOSE, true);
// error handling
curl_errorstr[0] = '\0';
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
// If we ask for uncompressed files servers might respond with content-
// negotiation which lets us end up with compressed files we do not support,
// see 657029, 657560 and co, so if we have no extension on the request
// ask for text only. As a sidenote: If there is nothing to negotate servers
// seem to be nice and ignore it.
if (_config->FindB("Acquire::https::SendAccept", _config->FindB("Acquire::http::SendAccept", true)) == true)
{
size_t const filepos = Itm->Uri.find_last_of('/');
string const file = Itm->Uri.substr(filepos + 1);
if (flExtension(file) == file)
headers = curl_slist_append(headers, "Accept: text/*");
}
// if we have the file send an if-range query with a range header
if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
{
std::string Buf;
strprintf(Buf, "Range: bytes=%lli-", (long long) SBuf.st_size);
headers = curl_slist_append(headers, Buf.c_str());
strprintf(Buf, "If-Range: %s", TimeRFC1123(SBuf.st_mtime).c_str());
headers = curl_slist_append(headers, Buf.c_str());
}
else if(Itm->LastModified > 0)
{
curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified);
}
// go for it - if the file exists, append on it
File = new FileFd(Itm->DestFile, FileFd::WriteAny);
Server = new HttpsServerState(Itm->Uri, this);
// keep apt updated
Res.Filename = Itm->DestFile;
// get it!
CURLcode success = curl_easy_perform(curl);
// If the server returns 200 OK but the If-Modified-Since condition is not
// met, CURLINFO_CONDITION_UNMET will be set to 1
long curl_condition_unmet = 0;
curl_easy_getinfo(curl, CURLINFO_CONDITION_UNMET, &curl_condition_unmet);
File->Close();
curl_slist_free_all(headers);
// cleanup
if (success != 0)
{
_error->Error("%s", curl_errorstr);
unlink(File->Name().c_str());
return false;
}
// server says file not modified
if (Server->Result == 304 || curl_condition_unmet == 1)
{
unlink(File->Name().c_str());
Res.IMSHit = true;
Res.LastModified = Itm->LastModified;
Res.Size = 0;
URIDone(Res);
return true;
}
Res.IMSHit = false;
if (Server->Result != 200 && // OK
Server->Result != 206 && // Partial
Server->Result != 416) // invalid Range
{
char err[255];
snprintf(err, sizeof(err) - 1, "HttpError%i", Server->Result);
SetFailReason(err);
_error->Error("%s", err);
// unlink, no need keep 401/404 page content in partial/
unlink(File->Name().c_str());
return false;
}
struct stat resultStat;
if (unlikely(stat(File->Name().c_str(), &resultStat) != 0))
{
_error->Errno("stat", "Unable to access file %s", File->Name().c_str());
return false;
}
Res.Size = resultStat.st_size;
// invalid range-request
if (Server->Result == 416)
{
unlink(File->Name().c_str());
Res.Size = 0;
delete File;
Redirect(Itm->Uri);
return true;
}
// Timestamp
curl_easy_getinfo(curl, CURLINFO_FILETIME, &Res.LastModified);
if (Res.LastModified != -1)
{
struct timeval times[2];
times[0].tv_sec = Res.LastModified;
times[1].tv_sec = Res.LastModified;
times[0].tv_usec = times[1].tv_usec = 0;
utimes(File->Name().c_str(), times);
}
else
Res.LastModified = resultStat.st_mtime;
// take hashes
Hashes Hash;
FileFd Fd(Res.Filename, FileFd::ReadOnly);
Hash.AddFD(Fd);
Res.TakeHashes(Hash);
// keep apt updated
URIDone(Res);
// cleanup
Res.Size = 0;
delete File;
return true;
}
int main()
{
setlocale(LC_ALL, "");
DropPrivs();
HttpsMethod Mth;
curl_global_init(CURL_GLOBAL_SSL) ;
return Mth.Run();
}