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-rw-r--r--methods/gpgv.cc82
1 files changed, 64 insertions, 18 deletions
diff --git a/methods/gpgv.cc b/methods/gpgv.cc
index 84b8c3e59..9135b49c5 100644
--- a/methods/gpgv.cc
+++ b/methods/gpgv.cc
@@ -20,6 +20,7 @@
#include <array>
#include <iostream>
#include <iterator>
+#include <map>
#include <sstream>
#include <string>
#include <vector>
@@ -105,7 +106,8 @@ class GPGVMethod : public aptMethod
{
private:
string VerifyGetSigners(const char *file, const char *outfile,
- std::string const &key,
+ vector<string> const &keyFpts,
+ vector<string> const &keyFiles,
vector<string> &GoodSigners,
vector<string> &BadSigners,
vector<string> &WorthlessSigners,
@@ -145,7 +147,8 @@ static void PushEntryWithUID(std::vector<std::string> &Signers, char * const buf
Signers.push_back(msg);
}
string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
- std::string const &key,
+ vector<string> const &keyFpts,
+ vector<string> const &keyFiles,
vector<string> &GoodSigners,
vector<string> &BadSigners,
vector<string> &WorthlessSigners,
@@ -158,7 +161,6 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
std::clog << "inside VerifyGetSigners" << std::endl;
int fd[2];
- bool const keyIsID = (key.empty() == false && key[0] != '/');
if (pipe(fd) < 0)
return "Couldn't create pipe";
@@ -167,7 +169,15 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
if (pid < 0)
return string("Couldn't spawn new process") + strerror(errno);
else if (pid == 0)
- ExecGPGV(outfile, file, 3, fd, (keyIsID ? "" : key));
+ {
+ std::ostringstream keys;
+ if (keyFiles.empty() == false)
+ {
+ std::copy(keyFiles.begin(), keyFiles.end()-1, std::ostream_iterator<std::string>(keys, ","));
+ keys << *keyFiles.rbegin();
+ }
+ ExecGPGV(outfile, file, 3, fd, keys.str());
+ }
close(fd[1]);
FILE *pipein = fdopen(fd[0], "r");
@@ -175,6 +185,7 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
// 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;
+ std::map<std::string, std::vector<std::string>> SubKeyMapping;
size_t buffersize = 0;
char *buffer = NULL;
bool gotNODATA = false;
@@ -242,6 +253,9 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
}
ValidSigners.push_back(sig);
+
+ if (tokens.size() > 9 && sig != tokens[9])
+ SubKeyMapping[tokens[9]].emplace_back(sig);
}
else if (strncmp(buffer, APTKEYWARNING, sizeof(APTKEYWARNING)-1) == 0)
Warning("%s", buffer + sizeof(APTKEYWARNING));
@@ -254,26 +268,52 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
// 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 (keyFpts.empty() == false)
{
if (Debug == true)
- std::clog << "GoodSigs needs to be limited to keyid(s) " << key << std::endl;
- auto const limitedTo = VectorizeString(key, ',');
+ {
+ std::clog << "GoodSigs needs to be limited to keyid(s): ";
+ std::copy(keyFpts.begin(), keyFpts.end(), std::ostream_iterator<std::string>(std::clog, ", "));
+ std::clog << "\n";
+ }
std::vector<std::string> filteredGood;
for (auto &&good: GoodSigners)
{
if (Debug == true)
std::clog << "Key " << good << " is good sig, is it also a valid and allowed one? ";
bool found = false;
- for (auto const &l : limitedTo)
+ for (auto l : keyFpts)
{
- if (IsTheSameKey(l, good) == false)
- continue;
- // GOODSIG might be "just" a longid, so we check VALIDSIG which is always a fingerprint
- if (std::find(ValidSigners.begin(), ValidSigners.end(), l) == ValidSigners.end())
- continue;
- found = true;
- break;
+ bool exactKey = false;
+ if (APT::String::Endswith(l, "!"))
+ {
+ exactKey = true;
+ l.erase(l.length() - 1);
+ }
+ if (IsTheSameKey(l, good))
+ {
+ // GOODSIG might be "just" a longid, so we check VALIDSIG which is always a fingerprint
+ if (std::find(ValidSigners.cbegin(), ValidSigners.cend(), l) == ValidSigners.cend())
+ continue;
+ found = true;
+ break;
+ }
+ else if (exactKey == false)
+ {
+ auto const master = SubKeyMapping.find(l);
+ if (master == SubKeyMapping.end())
+ continue;
+ for (auto const &sub : master->second)
+ if (IsTheSameKey(sub, good))
+ {
+ if (std::find(ValidSigners.cbegin(), ValidSigners.cend(), sub) == ValidSigners.cend())
+ continue;
+ found = true;
+ break;
+ }
+ if (found)
+ break;
+ }
}
if (Debug)
std::clog << (found ? "yes" : "no") << "\n";
@@ -325,7 +365,7 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
}
else if (WEXITSTATUS(status) == 0)
{
- if (keyIsID)
+ if (keyFpts.empty() == false)
{
// 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
@@ -351,7 +391,6 @@ bool GPGVMethod::URIAcquire(std::string const &Message, FetchItem *Itm)
{
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;
// a worthless signature is a expired or revoked one
@@ -363,8 +402,15 @@ bool GPGVMethod::URIAcquire(std::string const &Message, FetchItem *Itm)
Res.Filename = Itm->DestFile;
URIStart(Res);
+ std::vector<std::string> keyFpts, keyFiles;
+ for (auto &&key : VectorizeString(LookupTag(Message, "Signed-By"), ','))
+ if (key.empty() == false && key[0] == '/')
+ keyFiles.emplace_back(std::move(key));
+ else
+ keyFpts.emplace_back(std::move(key));
+
// 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,
+ string const msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(), keyFpts, keyFiles,
GoodSigners, BadSigners, WorthlessSigners,
SoonWorthlessSigners, NoPubKeySigners);
if (_error->PendingError())