diff options
Diffstat (limited to 'methods/gpgv.cc')
| -rw-r--r-- | methods/gpgv.cc | 69 |
1 files changed, 60 insertions, 9 deletions
diff --git a/methods/gpgv.cc b/methods/gpgv.cc index 014430041..d88a06789 100644 --- a/methods/gpgv.cc +++ b/methods/gpgv.cc @@ -15,6 +15,8 @@ #include <string.h> #include <sys/wait.h> #include <unistd.h> + +#include <algorithm> #include <iostream> #include <string> #include <vector> @@ -74,6 +76,7 @@ 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"; @@ -82,12 +85,13 @@ 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, key); + 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) @@ -107,32 +111,31 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile, 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"); @@ -143,10 +146,48 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile, 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); + char *p = sig; + while (*p && isxdigit(*p)) + p++; + *p = 0; + if (Debug == true) + std::clog << "Got VALIDSIG, key ID: " << sig << std::endl; + 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) @@ -156,8 +197,18 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile, 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) |