add apt-key support for armored GPG key files (*.asc)

[apt.git] / methods / gpgv.cc

diff --git a/methods/gpgv.cc b/methods/gpgv.cc
index 75335b9b852f05437a6bd47fe04198a1efa84818..a8887d70355973a9b81f04478f8b6550c1b93a2c 100644 (file)
--- a/methods/gpgv.cc
+++ b/methods/gpgv.cc
@@ -1,240 +1,404 @@
+#include <config.h>
+
+#include <apt-pkg/configuration.h>

 #include <apt-pkg/error.h>
 #include <apt-pkg/error.h>

-#include <apt-pkg/acquire-method.h>
+#include <apt-pkg/gpgv.h>

 #include <apt-pkg/strutl.h>
 #include <apt-pkg/strutl.h>

-#include <apti18n.h>
+#include <apt-pkg/fileutl.h>
+#include "aptmethod.h"

 
 

-#include <sys/stat.h>
-#include <unistd.h>
-#include <utime.h>
-#include <stdio.h>
-#include <fcntl.h>
+#include <ctype.h>

 #include <errno.h>
 #include <errno.h>

+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>

 #include <sys/wait.h>
 #include <sys/wait.h>

-#include <iostream>
+#include <unistd.h>
+
+#include <array>
+#include <algorithm>

 #include <sstream>
 #include <sstream>

+#include <iterator>
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include <apti18n.h>
+
+using std::string;
+using std::vector;

 
 #define GNUPGPREFIX "[GNUPG:]"
 #define GNUPGBADSIG "[GNUPG:] BADSIG"
 
 #define GNUPGPREFIX "[GNUPG:]"
 #define GNUPGBADSIG "[GNUPG:] BADSIG"

+#define GNUPGERRSIG "[GNUPG:] ERRSIG"

 #define GNUPGNOPUBKEY "[GNUPG:] NO_PUBKEY"
 #define GNUPGVALIDSIG "[GNUPG:] VALIDSIG"
 #define GNUPGNOPUBKEY "[GNUPG:] NO_PUBKEY"
 #define GNUPGVALIDSIG "[GNUPG:] VALIDSIG"

+#define GNUPGGOODSIG "[GNUPG:] GOODSIG"
+#define GNUPGEXPKEYSIG "[GNUPG:] EXPKEYSIG"
+#define GNUPGEXPSIG "[GNUPG:] EXPSIG"
+#define GNUPGREVKEYSIG "[GNUPG:] REVKEYSIG"
+#define GNUPGNODATA "[GNUPG:] NODATA"
+#define APTKEYWARNING "[APTKEY:] WARNING"
+#define APTKEYERROR "[APTKEY:] ERROR"
+
+struct Digest {
+   enum class State {
+      Untrusted,
+      Weak,
+      Trusted,
+   } state;
+   char name[32];
+
+   State getState() const {
+      std::string optionUntrusted;
+      std::string optionWeak;
+      strprintf(optionUntrusted, "APT::Hashes::%s::Untrusted", name);
+      strprintf(optionWeak, "APT::Hashes::%s::Weak", name);
+      if (_config->FindB(optionUntrusted, state == State::Untrusted) == true)
+        return State::Untrusted;
+      if (_config->FindB(optionWeak, state == State::Weak) == true)
+        return State::Weak;
+
+      return state;
+   }
+};
+
+static constexpr Digest Digests[] = {
+   {Digest::State::Untrusted, "Invalid digest"},
+   {Digest::State::Untrusted, "MD5"},
+   {Digest::State::Weak, "SHA1"},
+   {Digest::State::Weak, "RIPE-MD/160"},
+   {Digest::State::Trusted, "Reserved digest"},
+   {Digest::State::Trusted, "Reserved digest"},
+   {Digest::State::Trusted, "Reserved digest"},
+   {Digest::State::Trusted, "Reserved digest"},
+   {Digest::State::Trusted, "SHA256"},
+   {Digest::State::Trusted, "SHA384"},
+   {Digest::State::Trusted, "SHA512"},
+   {Digest::State::Trusted, "SHA224"},
+};
+
+static Digest FindDigest(std::string const & Digest)
+{
+   int id = atoi(Digest.c_str());
+   if (id >= 0 && static_cast<unsigned>(id) < _count(Digests)) {
+      return Digests[id];
+   } else {
+      return Digests[0];
+   }
+}
+
+struct Signer {
+   std::string key;
+   std::string note;
+};
+static bool IsTheSameKey(std::string const &validsig, std::string const &goodsig) {
+   // VALIDSIG reports a keyid (40 = 24 + 16), GOODSIG is a longid (16) only
+   return validsig.compare(24, 16, goodsig, strlen("GOODSIG "), 16) == 0;
+}

 
 

-class GPGVMethod : public pkgAcqMethod
+class GPGVMethod : public aptMethod

 {
    private:
    string VerifyGetSigners(const char *file, const char *outfile,
 {
    private:
    string VerifyGetSigners(const char *file, const char *outfile,

-                               vector<string> &GoodSigners, vector<string> &BadSigners,
+                               std::string const &key,
+                               vector<string> &GoodSigners,
+                                vector<string> &BadSigners,
+                                vector<string> &WorthlessSigners,
+                                vector<Signer> &SoonWorthlessSigners,

                                vector<string> &NoPubKeySigners);
                                vector<string> &NoPubKeySigners);

-   

    protected:
    protected:

-   virtual bool Fetch(FetchItem *Itm);
-   
+   virtual bool URIAcquire(std::string const &Message, FetchItem *Itm) APT_OVERRIDE;

    public:
    public:

-   
-   GPGVMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig) {};
+   GPGVMethod() : aptMethod("gpgv","1.0",SingleInstance | SendConfig) {};

 };
 };

-
+static void PushEntryWithKeyID(std::vector<std::string> &Signers, char * const buffer, bool const Debug)
+{
+   char * const msg = buffer + sizeof(GNUPGPREFIX);
+   char *p = msg;
+   // skip the message
+   while (*p && !isspace(*p))
+      ++p;
+   // skip the seperator whitespace
+   ++p;
+   // skip the hexdigit fingerprint
+   while (*p && isxdigit(*p))
+      ++p;
+   // cut the rest from the message
+   *p = '\0';
+   if (Debug == true)
+      std::clog << "Got " << msg << " !" << std::endl;
+   Signers.push_back(msg);
+}
+static void PushEntryWithUID(std::vector<std::string> &Signers, char * const buffer, bool const Debug)
+{
+   std::string msg = buffer + sizeof(GNUPGPREFIX);
+   auto const nuke = msg.find_last_not_of("\n\t\r");
+   if (nuke != std::string::npos)
+      msg.erase(nuke + 1);
+   if (Debug == true)
+      std::clog << "Got " << msg << " !" << std::endl;
+   Signers.push_back(msg);
+}

 string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
 string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,

+                                        std::string const &key,

                                         vector<string> &GoodSigners,
                                         vector<string> &BadSigners,
                                         vector<string> &GoodSigners,
                                         vector<string> &BadSigners,

+                                        vector<string> &WorthlessSigners,
+                                        vector<Signer> &SoonWorthlessSigners,

                                         vector<string> &NoPubKeySigners)
 {
                                         vector<string> &NoPubKeySigners)
 {

-   // setup a (empty) stringstream for formating the return value
-   std::stringstream ret;
-   res.str("");
+   bool const Debug = DebugEnabled();
+
+   if (Debug == true)
+      std::clog << "inside VerifyGetSigners" << std::endl;

 
 

-   if (_config->FindB("Debug::Acquire::gpgv", false))
-   {
-      std::cerr << "inside VerifyGetSigners" << std::endl;
-   }
-   pid_t pid;

    int fd[2];
    int fd[2];

-   FILE *pipein;
-   int status;
-   struct stat buff;
-   string gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv");
-   string pubringpath = _config->Find("APT::GPGV::TrustedKeyring", "/etc/apt/trusted.gpg");
-   if (_config->FindB("Debug::Acquire::gpgv", false))
-   {
-      std::cerr << "gpgv path: " << gpgvpath << std::endl;
-      std::cerr << "Keyring path: " << pubringpath << std::endl;
-   }
+   bool const keyIsID = (key.empty() == false && key[0] != '/');

 
 

-   if (stat(pubringpath.c_str(), &buff) != 0) 
-   {
-      ioprintf(ret, _("Couldn't access keyring: '%s'"), strerror(errno)); 
-      return ret.str();
-   }

    if (pipe(fd) < 0)
    if (pipe(fd) < 0)

-   {

       return "Couldn't create pipe";
       return "Couldn't create pipe";

-   }

 
 

-   pid = fork();
+   pid_t pid = fork();

    if (pid < 0)
    if (pid < 0)

-   {

       return string("Couldn't spawn new process") + strerror(errno);
       return string("Couldn't spawn new process") + strerror(errno);

-   }

    else if (pid == 0)
    else if (pid == 0)

-   {
-      const char *Args[400];
-      unsigned int i = 0;
-
-      Args[i++] = gpgvpath.c_str();
-      Args[i++] = "--status-fd";
-      Args[i++] = "3";
-      Args[i++] = "--keyring";
-      Args[i++] = pubringpath.c_str();
-
-      Configuration::Item const *Opts;
-      Opts = _config->Tree("Acquire::gpgv::Options");
-      if (Opts != 0)
-      {
-         Opts = Opts->Child;
-        for (; Opts != 0; Opts = Opts->Next)
-         {
-            if (Opts->Value.empty() == true)
-               continue;
-            Args[i++] = Opts->Value.c_str();
-           if(i >= 395) { 
-              std::cerr << _("E: Argument list from Acquire::gpgv::Options too long. Exiting.") << std::endl;
-              exit(111);
-           }
-         }
-      }
-      Args[i++] = file;
-      Args[i++] = outfile;
-      Args[i++] = NULL;
-
-      if (_config->FindB("Debug::Acquire::gpgv", false))
-      {
-         std::cerr << "Preparing to exec: " << gpgvpath;
-        for(unsigned int j=0;Args[j] != NULL; j++)
-           std::cerr << " " << Args[j];
-        std::cerr << std::endl;
-      }
-      int nullfd = open("/dev/null", O_RDONLY);
-      close(fd[0]);
-      // Redirect output to /dev/null; we read from the status fd
-      dup2(nullfd, STDOUT_FILENO); 
-      dup2(nullfd, STDERR_FILENO); 
-      // Redirect the pipe to the status fd (3)
-      dup2(fd[1], 3);
-
-      putenv("LANG=");
-      putenv("LC_ALL=");
-      putenv("LC_MESSAGES=");
-      execvp(gpgvpath.c_str(), (char **)Args);
-             
-      exit(111);
-   }
+      ExecGPGV(outfile, file, 3, fd, (keyIsID ? "" : key));

    close(fd[1]);
 
    close(fd[1]);
 

-   pipein = fdopen(fd[0], "r"); 
-   
-   // Loop over the output of gpgv, and check the signatures.
-   size_t buffersize = 64;
-   char *buffer = (char *) malloc(buffersize);
-   size_t bufferoff = 0;
+   FILE *pipein = fdopen(fd[0], "r");
+
+   // Loop over the output of apt-key (which really is gnupg), and check the signatures.
+   std::vector<std::string> ValidSigners;
+   std::vector<std::string> ErrSigners;
+   size_t buffersize = 0;
+   char *buffer = NULL;
+   bool gotNODATA = false;

    while (1)
    {
    while (1)
    {

-      int c;
-
-      // Read a line.  Sigh.
-      while ((c = getc(pipein)) != EOF && c != '\n')
-      {
-         if (bufferoff == buffersize)
-            buffer = (char *) realloc(buffer, buffersize *= 2);
-         *(buffer+bufferoff) = c;
-         bufferoff++;
-      }
-      if (bufferoff == 0 && c == EOF)
-         break;
-      *(buffer+bufferoff) = '\0';
-      bufferoff = 0;
-      if (_config->FindB("Debug::Acquire::gpgv", false))
-         std::cerr << "Read: " << buffer << std::endl;
+      if (getline(&buffer, &buffersize, pipein) == -1)
+        break;
+      if (Debug == true)
+         std::clog << "Read: " << buffer << std::endl;

 
       // Push the data into three separate vectors, which
       // we later concatenate.  They're kept separate so
       // if we improve the apt method communication stuff later
       // it will be better.
       if (strncmp(buffer, GNUPGBADSIG, sizeof(GNUPGBADSIG)-1) == 0)
 
       // Push the data into three separate vectors, which
       // we later concatenate.  They're kept separate so
       // if we improve the apt method communication stuff later
       // it will be better.
       if (strncmp(buffer, GNUPGBADSIG, sizeof(GNUPGBADSIG)-1) == 0)

+        PushEntryWithUID(BadSigners, buffer, Debug);
+      else if (strncmp(buffer, GNUPGERRSIG, sizeof(GNUPGERRSIG)-1) == 0)
+        PushEntryWithKeyID(ErrSigners, buffer, Debug);
+      else if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)

       {
       {

-         if (_config->FindB("Debug::Acquire::gpgv", false))
-            std::cerr << "Got BADSIG! " << std::endl;
-         BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
+        PushEntryWithKeyID(NoPubKeySigners, buffer, Debug);
+        ErrSigners.erase(std::remove_if(ErrSigners.begin(), ErrSigners.end(), [&](std::string const &errsig) {
+                 return errsig.compare(strlen("ERRSIG "), 16, buffer, sizeof(GNUPGNOPUBKEY), 16) == 0;  }), ErrSigners.end());

       }
       }

-      
-      if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)
+      else if (strncmp(buffer, GNUPGNODATA, sizeof(GNUPGNODATA)-1) == 0)
+        gotNODATA = true;
+      else if (strncmp(buffer, GNUPGEXPKEYSIG, sizeof(GNUPGEXPKEYSIG)-1) == 0)
+        PushEntryWithUID(WorthlessSigners, buffer, Debug);
+      else if (strncmp(buffer, GNUPGEXPSIG, sizeof(GNUPGEXPSIG)-1) == 0)
+        PushEntryWithUID(WorthlessSigners, buffer, Debug);
+      else if (strncmp(buffer, GNUPGREVKEYSIG, sizeof(GNUPGREVKEYSIG)-1) == 0)
+        PushEntryWithUID(WorthlessSigners, buffer, Debug);
+      else if (strncmp(buffer, GNUPGGOODSIG, sizeof(GNUPGGOODSIG)-1) == 0)
+        PushEntryWithKeyID(GoodSigners, buffer, Debug);
+      else if (strncmp(buffer, GNUPGVALIDSIG, sizeof(GNUPGVALIDSIG)-1) == 0)

       {
       {

-         if (_config->FindB("Debug::Acquire::gpgv", false))
-            std::cerr << "Got NO_PUBKEY " << std::endl;
-         NoPubKeySigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
+         std::istringstream iss(buffer + sizeof(GNUPGVALIDSIG));
+         vector<string> tokens{std::istream_iterator<string>{iss},
+                               std::istream_iterator<string>{}};
+         auto const sig = tokens[0];
+         // Reject weak digest algorithms
+         Digest digest = FindDigest(tokens[7]);
+         switch (digest.getState()) {
+         case Digest::State::Weak:
+            // Treat them like an expired key: For that a message about expiry
+            // is emitted, a VALIDSIG, but no GOODSIG.
+            SoonWorthlessSigners.push_back({sig, digest.name});
+           if (Debug == true)
+              std::clog << "Got weak VALIDSIG, key ID: " << sig << std::endl;
+            break;
+         case Digest::State::Untrusted:
+            // Treat them like an expired key: For that a message about expiry
+            // is emitted, a VALIDSIG, but no GOODSIG.
+            WorthlessSigners.push_back(sig);
+            GoodSigners.erase(std::remove_if(GoodSigners.begin(), GoodSigners.end(), [&](std::string const &goodsig) {
+                    return IsTheSameKey(sig, goodsig); }), GoodSigners.end());
+           if (Debug == true)
+              std::clog << "Got untrusted VALIDSIG, key ID: " << sig << std::endl;
+            break;
+
+        case Digest::State::Trusted:
+           if (Debug == true)
+              std::clog << "Got trusted VALIDSIG, key ID: " << sig << std::endl;
+            break;
+         }
+
+         ValidSigners.push_back(sig);

       }
       }

+      else if (strncmp(buffer, APTKEYWARNING, sizeof(APTKEYWARNING)-1) == 0)
+         Warning("%s", buffer + sizeof(APTKEYWARNING));
+      else if (strncmp(buffer, APTKEYERROR, sizeof(APTKEYERROR)-1) == 0)
+        _error->Error("%s", buffer + sizeof(APTKEYERROR));
+   }
+   fclose(pipein);
+   free(buffer);
+   std::move(ErrSigners.begin(), ErrSigners.end(), std::back_inserter(WorthlessSigners));

 
 

-      if (strncmp(buffer, GNUPGVALIDSIG, sizeof(GNUPGVALIDSIG)-1) == 0)
+   // apt-key has a --keyid parameter, but this requires gpg, so we call it without it
+   // and instead check after the fact which keyids where used for verification
+   if (keyIsID == true)
+   {
+      if (Debug == true)
+        std::clog << "GoodSigs needs to be limited to keyid " << key << std::endl;
+      bool foundGood = false;
+      for (auto const &k: VectorizeString(key, ','))

       {
       {

-         char *sig = buffer + sizeof(GNUPGPREFIX);
-         char *p = sig + sizeof("VALIDSIG");
-         while (*p && isxdigit(*p)) 
-            p++;
-         *p = 0;
-         if (_config->FindB("Debug::Acquire::gpgv", false))
-            std::cerr << "Got VALIDSIG, key ID:" << sig << std::endl;
-         GoodSigners.push_back(string(sig));
+        if (std::find(ValidSigners.begin(), ValidSigners.end(), k) == ValidSigners.end())
+           continue;
+        // we look for GOODSIG here as well as an expired sig is a valid sig as well (but not a good one)
+        std::string const goodfingerprint = "GOODSIG " + k;
+        std::string const goodlongkeyid = "GOODSIG " + k.substr(24, 16);
+        foundGood = std::find(GoodSigners.begin(), GoodSigners.end(), goodfingerprint) != GoodSigners.end();
+        if (Debug == true)
+           std::clog << "Key " << k << " is valid sig, is " << goodfingerprint << " also a good one? " << (foundGood ? "yes" : "no") << std::endl;
+        std::string goodsig;
+        if (foundGood == false)
+        {
+           foundGood = std::find(GoodSigners.begin(), GoodSigners.end(), goodlongkeyid) != GoodSigners.end();
+           if (Debug == true)
+              std::clog << "Key " << k << " is valid sig, is " << goodlongkeyid << " also a good one? " << (foundGood ? "yes" : "no") << std::endl;
+           goodsig = goodlongkeyid;
+        }
+        else
+           goodsig = goodfingerprint;
+        if (foundGood == false)
+           continue;
+        std::copy(GoodSigners.begin(), GoodSigners.end(), std::back_insert_iterator<std::vector<std::string> >(NoPubKeySigners));
+        GoodSigners.clear();
+        GoodSigners.push_back(goodsig);
+        NoPubKeySigners.erase(
+           std::remove(NoPubKeySigners.begin(),
+              std::remove(NoPubKeySigners.begin(), NoPubKeySigners.end(), goodfingerprint),
+              goodlongkeyid),
+           NoPubKeySigners.end()
+        );
+        break;
+      }
+      if (foundGood == false)
+      {
+        std::copy(GoodSigners.begin(), GoodSigners.end(), std::back_insert_iterator<std::vector<std::string> >(NoPubKeySigners));
+        GoodSigners.clear();

       }
    }
       }
    }

-   fclose(pipein);

 
 

+   int status;

    waitpid(pid, &status, 0);
    waitpid(pid, &status, 0);

-   if (_config->FindB("Debug::Acquire::gpgv", false))
+   if (Debug == true)

    {
    {

-      std::cerr << "gpgv exited\n";
+      ioprintf(std::clog, "gpgv exited with status %i\n", WEXITSTATUS(status));

    }
    }

-   
-   if (WEXITSTATUS(status) == 0)
+
+   if (Debug)

    {
    {

-      if (GoodSigners.empty())
-         return _("Internal error: Good signature, but could not determine key fingerprint?!");
-      return "";
+      std::cerr << "Summary:" << std::endl << "  Good: ";
+      std::copy(GoodSigners.begin(), GoodSigners.end(), std::ostream_iterator<std::string>(std::cerr, ", "));
+      std::cerr << std::endl << "  Bad: ";
+      std::copy(BadSigners.begin(), BadSigners.end(), std::ostream_iterator<std::string>(std::cerr, ", "));
+      std::cerr << std::endl << "  Worthless: ";
+      std::copy(WorthlessSigners.begin(), WorthlessSigners.end(), std::ostream_iterator<std::string>(std::cerr, ", "));
+      std::cerr << std::endl << "  SoonWorthless: ";
+      std::for_each(SoonWorthlessSigners.begin(), SoonWorthlessSigners.end(), [](Signer const &sig) { std::cerr << sig.key << ", "; });
+      std::cerr << std::endl << "  NoPubKey: ";
+      std::copy(NoPubKeySigners.begin(), NoPubKeySigners.end(), std::ostream_iterator<std::string>(std::cerr, ", "));
+      std::cerr << std::endl << "  NODATA: " << (gotNODATA ? "yes" : "no") << std::endl;

    }
    }

-   else if (WEXITSTATUS(status) == 1)
+
+   if (WEXITSTATUS(status) == 112)

    {
    {

-      return _("At least one invalid signature was encountered.");
+      // acquire system checks for "NODATA" to generate GPG errors (the others are only warnings)
+      std::string errmsg;
+      //TRANSLATORS: %s is a single techy word like 'NODATA'
+      strprintf(errmsg, _("Clearsigned file isn't valid, got '%s' (does the network require authentication?)"), "NODATA");
+      return errmsg;

    }
    }

-   else if (WEXITSTATUS(status) == 111)
+   else if (gotNODATA)

    {
    {

-      ioprintf(ret, _("Could not execute '%s' to verify signature (is gnupg installed?)"), gpgvpath.c_str());
-      return ret.str();
+      // acquire system checks for "NODATA" to generate GPG errors (the others are only warnings)
+      std::string errmsg;
+      //TRANSLATORS: %s is a single techy word like 'NODATA'
+      strprintf(errmsg, _("Signed file isn't valid, got '%s' (does the network require authentication?)"), "NODATA");
+      return errmsg;

    }
    }

-   else
+   else if (WEXITSTATUS(status) == 0)

    {
    {

-      return _("Unknown error executing gpgv");
+      if (keyIsID)
+      {
+        // gpgv will report success, but we want to enforce a certain keyring
+        // so if we haven't found the key the valid we found is in fact invalid
+        if (GoodSigners.empty())
+           return _("At least one invalid signature was encountered.");
+      }
+      else
+      {
+        if (GoodSigners.empty())
+           return _("Internal error: Good signature, but could not determine key fingerprint?!");
+      }
+      return "";

    }
    }

+   else if (WEXITSTATUS(status) == 1)
+      return _("At least one invalid signature was encountered.");
+   else if (WEXITSTATUS(status) == 111)
+      return _("Could not execute 'apt-key' to verify signature (is gnupg installed?)");
+   else
+      return _("Unknown error executing apt-key");

 }
 
 }
 

-bool GPGVMethod::Fetch(FetchItem *Itm)
+bool GPGVMethod::URIAcquire(std::string const &Message, FetchItem *Itm)

 {
 {

-   URI Get = Itm->Uri;
-   string Path = Get.Host + Get.Path; // To account for relative paths
-   string keyID;
+   URI const Get = Itm->Uri;
+   string const Path = Get.Host + Get.Path; // To account for relative paths
+   std::string const key = LookupTag(Message, "Signed-By");

    vector<string> GoodSigners;
    vector<string> BadSigners;
    vector<string> GoodSigners;
    vector<string> BadSigners;

+   // a worthless signature is a expired or revoked one
+   vector<string> WorthlessSigners;
+   vector<Signer> SoonWorthlessSigners;

    vector<string> NoPubKeySigners;
    
    FetchResult Res;
    Res.Filename = Itm->DestFile;
    URIStart(Res);
 
    vector<string> NoPubKeySigners;
    
    FetchResult Res;
    Res.Filename = Itm->DestFile;
    URIStart(Res);
 

-   // Run gpgv on file, extract contents and get the key ID of the signer
-   string msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(),
-                             GoodSigners, BadSigners, NoPubKeySigners);
+   // Run apt-key on file, extract contents and get the key ID of the signer
+   string const msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(), key,
+                                 GoodSigners, BadSigners, WorthlessSigners,
+                                 SoonWorthlessSigners, NoPubKeySigners);
+   if (_error->PendingError())
+      return false;
+
+   // Check if all good signers are soon worthless and warn in that case
+   if (std::all_of(GoodSigners.begin(), GoodSigners.end(), [&](std::string const &good) {
+           return std::any_of(SoonWorthlessSigners.begin(), SoonWorthlessSigners.end(), [&](Signer const &weak) {
+                 return IsTheSameKey(weak.key, good);
+                 });
+           }))
+   {
+      for (auto const & Signer : SoonWorthlessSigners)
+         // TRANSLATORS: The second %s is the reason and is untranslated for repository owners.
+         Warning(_("Signature by key %s uses weak digest algorithm (%s)"), Signer.key.c_str(), Signer.note.c_str());
+   }
+

    if (GoodSigners.empty() || !BadSigners.empty() || !NoPubKeySigners.empty())
    {
       string errmsg;
       // In this case, something bad probably happened, so we just go
       // with what the other method gave us for an error message.
    if (GoodSigners.empty() || !BadSigners.empty() || !NoPubKeySigners.empty())
    {
       string errmsg;
       // In this case, something bad probably happened, so we just go
       // with what the other method gave us for an error message.

-      if (BadSigners.empty() && NoPubKeySigners.empty())
+      if (BadSigners.empty() && WorthlessSigners.empty() && NoPubKeySigners.empty())

          errmsg = msg;
       else
       {
          errmsg = msg;
       else
       {


@@ -242,14 +406,21 @@ bool GPGVMethod::Fetch(FetchItem *Itm)
          {
             errmsg += _("The following signatures were invalid:\n");
             for (vector<string>::iterator I = BadSigners.begin();
          {
             errmsg += _("The following signatures were invalid:\n");
             for (vector<string>::iterator I = BadSigners.begin();

-                I != BadSigners.end(); I++)
+                I != BadSigners.end(); ++I)
+               errmsg += (*I + "\n");
+         }
+         if (!WorthlessSigners.empty())
+         {
+            errmsg += _("The following signatures were invalid:\n");
+            for (vector<string>::iterator I = WorthlessSigners.begin();
+                I != WorthlessSigners.end(); ++I)

                errmsg += (*I + "\n");
          }
          if (!NoPubKeySigners.empty())
          {
              errmsg += _("The following signatures couldn't be verified because the public key is not available:\n");
             for (vector<string>::iterator I = NoPubKeySigners.begin();
                errmsg += (*I + "\n");
          }
          if (!NoPubKeySigners.empty())
          {
              errmsg += _("The following signatures couldn't be verified because the public key is not available:\n");
             for (vector<string>::iterator I = NoPubKeySigners.begin();

-                I != NoPubKeySigners.end(); I++)
+                I != NoPubKeySigners.end(); ++I)

                errmsg += (*I + "\n");
          }
       }
                errmsg += (*I + "\n");
          }
       }


@@ -257,38 +428,19 @@ bool GPGVMethod::Fetch(FetchItem *Itm)
       // least one bad signature. good signatures and NoPubKey signatures
       // happen easily when a file is signed with multiple signatures
       if(GoodSigners.empty() or !BadSigners.empty())
       // least one bad signature. good signatures and NoPubKey signatures
       // happen easily when a file is signed with multiple signatures
       if(GoodSigners.empty() or !BadSigners.empty())

-        return _error->Error(errmsg.c_str());
+        return _error->Error("%s", errmsg.c_str());

    }
       
    }
       

-   // Transfer the modification times
-   struct stat Buf;
-   if (stat(Path.c_str(),&Buf) != 0)
-      return _error->Errno("stat",_("Failed to stat %s"), Path.c_str());
-
-   struct utimbuf TimeBuf;
-   TimeBuf.actime = Buf.st_atime;
-   TimeBuf.modtime = Buf.st_mtime;
-   if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0)
-      return _error->Errno("utime",_("Failed to set modification time"));
-
-   if (stat(Itm->DestFile.c_str(),&Buf) != 0)
-      return _error->Errno("stat",_("Failed to stat"));
-   
-   // Return a Done response
-   Res.LastModified = Buf.st_mtime;
-   Res.Size = Buf.st_size;

    // Just pass the raw output up, because passing it as a real data
    // structure is too difficult with the method stuff.  We keep it
    // as three separate vectors for future extensibility.
    Res.GPGVOutput = GoodSigners;
    // Just pass the raw output up, because passing it as a real data
    // structure is too difficult with the method stuff.  We keep it
    // as three separate vectors for future extensibility.
    Res.GPGVOutput = GoodSigners;

-   Res.GPGVOutput.insert(Res.GPGVOutput.end(),BadSigners.begin(),BadSigners.end());
-   Res.GPGVOutput.insert(Res.GPGVOutput.end(),NoPubKeySigners.begin(),NoPubKeySigners.end());
+   std::move(BadSigners.begin(), BadSigners.end(), std::back_inserter(Res.GPGVOutput));
+   std::move(NoPubKeySigners.begin(), NoPubKeySigners.end(), std::back_inserter(Res.GPGVOutput));

    URIDone(Res);
 
    URIDone(Res);
 

-   if (_config->FindB("Debug::Acquire::gpgv", false))
-   {
-      std::cerr << "gpgv succeeded\n";
-   }
+   if (DebugEnabled())
+      std::clog << "apt-key succeeded\n";

 
    return true;
 }
 
    return true;
 }


@@ -296,9 +448,5 @@ bool GPGVMethod::Fetch(FetchItem *Itm)
 
 int main()
 {
 
 int main()
 {

-   setlocale(LC_ALL, "");
-   
-   GPGVMethod Mth;
-
-   return Mth.Run();
+   return GPGVMethod().Run();

 }
 }