#include <apt-pkg/gpgv.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/fileutl.h>
+#include "aptmethod.h"
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
+
+#include <array>
+#include <algorithm>
+#include <sstream>
+#include <iterator>
#include <iostream>
#include <string>
#include <vector>
#define GNUPGREVKEYSIG "[GNUPG:] REVKEYSIG"
#define GNUPGNODATA "[GNUPG:] NODATA"
-class GPGVMethod : public pkgAcqMethod
+struct Digest {
+ enum class State {
+ Untrusted,
+ Weak,
+ Trusted,
+ } state;
+ char name[32];
+};
+
+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;
+};
+
+class GPGVMethod : public aptMethod
{
private:
string VerifyGetSigners(const char *file, const char *outfile,
- vector<string> &GoodSigners,
+ std::string const &key,
+ vector<string> &GoodSigners,
vector<string> &BadSigners,
vector<string> &WorthlessSigners,
+ vector<Signer> &SoonWorthlessSigners,
vector<string> &NoPubKeySigners);
-
protected:
- virtual bool Fetch(FetchItem *Itm);
- virtual bool Configuration(string Message);
+ virtual bool URIAcquire(std::string const &Message, FetchItem *Itm) APT_OVERRIDE;
public:
- GPGVMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig) {};
+ GPGVMethod() : aptMethod("gpgv","1.0",SingleInstance | SendConfig) {};
};
-bool GPGVMethod::Configuration(string Message)
-{
- if (pkgAcqMethod::Configuration(Message) == false)
- return false;
-
- DropPrivsOrDie();
-
- return true;
-}
-
string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
+ std::string const &key,
vector<string> &GoodSigners,
vector<string> &BadSigners,
vector<string> &WorthlessSigners,
+ vector<Signer> &SoonWorthlessSigners,
vector<string> &NoPubKeySigners)
{
bool const Debug = _config->FindB("Debug::Acquire::gpgv", false);
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";
if (pid < 0)
return string("Couldn't spawn new process") + strerror(errno);
else if (pid == 0)
- ExecGPGV(outfile, file, 3, fd);
+ ExecGPGV(outfile, file, 3, fd, (keyIsID ? "" : key));
close(fd[1]);
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;
size_t buffersize = 0;
char *buffer = NULL;
while (1)
std::clog << "Got BADSIG! " << std::endl;
BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
-
- if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)
+ else if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)
{
if (Debug == true)
std::clog << "Got NO_PUBKEY " << std::endl;
NoPubKeySigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
- if (strncmp(buffer, GNUPGNODATA, sizeof(GNUPGBADSIG)-1) == 0)
+ else if (strncmp(buffer, GNUPGNODATA, sizeof(GNUPGBADSIG)-1) == 0)
{
if (Debug == true)
std::clog << "Got NODATA! " << std::endl;
BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
- if (strncmp(buffer, GNUPGKEYEXPIRED, sizeof(GNUPGKEYEXPIRED)-1) == 0)
+ else if (strncmp(buffer, GNUPGKEYEXPIRED, sizeof(GNUPGKEYEXPIRED)-1) == 0)
{
if (Debug == true)
std::clog << "Got KEYEXPIRED! " << std::endl;
WorthlessSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
- if (strncmp(buffer, GNUPGREVKEYSIG, sizeof(GNUPGREVKEYSIG)-1) == 0)
+ else if (strncmp(buffer, GNUPGREVKEYSIG, sizeof(GNUPGREVKEYSIG)-1) == 0)
{
if (Debug == true)
std::clog << "Got REVKEYSIG! " << std::endl;
WorthlessSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
- if (strncmp(buffer, GNUPGGOODSIG, sizeof(GNUPGGOODSIG)-1) == 0)
+ else if (strncmp(buffer, GNUPGGOODSIG, sizeof(GNUPGGOODSIG)-1) == 0)
{
char *sig = buffer + sizeof(GNUPGPREFIX);
char *p = sig + sizeof("GOODSIG");
std::clog << "Got GOODSIG, key ID:" << sig << std::endl;
GoodSigners.push_back(string(sig));
}
+ else if (strncmp(buffer, GNUPGVALIDSIG, sizeof(GNUPGVALIDSIG)-1) == 0)
+ {
+ char *sig = buffer + sizeof(GNUPGVALIDSIG);
+ std::istringstream iss((string(sig)));
+ vector<string> tokens{std::istream_iterator<string>{iss},
+ std::istream_iterator<string>{}};
+ char *p = sig;
+ while (*p && isxdigit(*p))
+ p++;
+ *p = 0;
+ if (Debug == true)
+ std::clog << "Got VALIDSIG, key ID: " << sig << std::endl;
+ // Reject weak digest algorithms
+ Digest digest = FindDigest(tokens[7]);
+ switch (digest.state) {
+ 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({string(sig), digest.name});
+ 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(string(sig));
+ GoodSigners.erase(std::remove(GoodSigners.begin(), GoodSigners.end(), string(sig)));
+ break;
+ case Digest::State::Trusted:
+ break;
+ }
+
+ ValidSigners.push_back(string(sig));
+ }
}
fclose(pipein);
free(buffer);
+ // 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;
+ std::vector<std::string>::iterator const foundItr = std::find(ValidSigners.begin(), ValidSigners.end(), key);
+ bool const found = (foundItr != ValidSigners.end());
+ std::copy(GoodSigners.begin(), GoodSigners.end(), std::back_insert_iterator<std::vector<std::string> >(NoPubKeySigners));
+ if (found)
+ {
+ // 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 goodlongkeyid = "GOODSIG " + key.substr(24, 16);
+ bool const foundGood = std::find(GoodSigners.begin(), GoodSigners.end(), goodlongkeyid) != GoodSigners.end();
+ if (Debug == true)
+ std::clog << "Key " << key << " is valid sig, is " << goodlongkeyid << " also a good one? " << (foundGood ? "yes" : "no") << std::endl;
+ GoodSigners.clear();
+ if (foundGood)
+ {
+ GoodSigners.push_back(goodlongkeyid);
+ NoPubKeySigners.erase(std::remove(NoPubKeySigners.begin(), NoPubKeySigners.end(), goodlongkeyid), NoPubKeySigners.end());
+ }
+ }
+ else
+ GoodSigners.clear();
+ }
+
int status;
waitpid(pid, &status, 0);
if (Debug == true)
if (WEXITSTATUS(status) == 0)
{
- if (GoodSigners.empty())
- return _("Internal error: Good signature, but could not determine key fingerprint?!");
+ 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 _("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;
// a worthless signature is a expired or revoked one
vector<string> WorthlessSigners;
+ vector<Signer> SoonWorthlessSigners;
vector<string> NoPubKeySigners;
FetchResult Res;
URIStart(Res);
// Run apt-key on file, extract contents and get the key ID of the signer
- string msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(),
+ string msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(), key,
GoodSigners, BadSigners, WorthlessSigners,
- NoPubKeySigners);
+ SoonWorthlessSigners, NoPubKeySigners);
+
+
+ // Check if there are any good signers that are not soon worthless
+ std::vector<std::string> NotWarnAboutSigners(GoodSigners);
+ for (auto const & Signer : SoonWorthlessSigners)
+ NotWarnAboutSigners.erase(std::remove(NotWarnAboutSigners.begin(), NotWarnAboutSigners.end(), "GOODSIG " + Signer.key));
+ // If all signers are soon worthless, report them.
+ if (NotWarnAboutSigners.empty()) {
+ 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;
projects / apt.git / blobdiff