#include <config.h> #include <apt-pkg/error.h> #include <apt-pkg/acquire-method.h> #include <apt-pkg/strutl.h> #include <apt-pkg/fileutl.h> #include <apt-pkg/indexcopy.h> #include <apt-pkg/configuration.h> #include <apt-pkg/gpgv.h> #include <stdio.h> #include <fcntl.h> #include <errno.h> #include <sys/wait.h> #include <iostream> #include <sstream> #include <vector> #include <apti18n.h> using std::string; using std::vector; #define GNUPGPREFIX "[GNUPG:]" #define GNUPGBADSIG "[GNUPG:] BADSIG" #define GNUPGNOPUBKEY "[GNUPG:] NO_PUBKEY" #define GNUPGVALIDSIG "[GNUPG:] VALIDSIG" #define GNUPGGOODSIG "[GNUPG:] GOODSIG" #define GNUPGKEYEXPIRED "[GNUPG:] KEYEXPIRED" #define GNUPGREVKEYSIG "[GNUPG:] REVKEYSIG" #define GNUPGNODATA "[GNUPG:] NODATA" class GPGVMethod : public pkgAcqMethod { private: string VerifyGetSigners(const char *file, const char *outfile, vector<string> &GoodSigners, vector<string> &BadSigners, vector<string> &WorthlessSigners, vector<string> &NoPubKeySigners); protected: virtual bool Fetch(FetchItem *Itm); public: GPGVMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig) {}; }; string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile, vector<string> &GoodSigners, vector<string> &BadSigners, vector<string> &WorthlessSigners, vector<string> &NoPubKeySigners) { bool const Debug = _config->FindB("Debug::Acquire::gpgv", false); if (Debug == true) std::clog << "inside VerifyGetSigners" << std::endl; int fd[2]; if (pipe(fd) < 0) return "Couldn't create pipe"; pid_t pid = fork(); if (pid < 0) return string("Couldn't spawn new process") + strerror(errno); else if (pid == 0) ExecGPGV(outfile, file, 3, fd); close(fd[1]); FILE *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; while (1) { int c; // Read a line. Sigh. while ((c = getc(pipein)) != EOF && c != '\n') { if (bufferoff == buffersize) { char* newBuffer = (char *) realloc(buffer, buffersize *= 2); if (newBuffer == NULL) { free(buffer); return "Couldn't allocate a buffer big enough for reading"; } buffer = newBuffer; } *(buffer+bufferoff) = c; bufferoff++; } if (bufferoff == 0 && c == EOF) break; *(buffer+bufferoff) = '\0'; bufferoff = 0; 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) { if (Debug == true) std::clog << "Got BADSIG! " << std::endl; BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX))); } 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) { if (Debug == true) std::clog << "Got NODATA! " << std::endl; BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX))); } 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) { if (Debug == true) std::clog << "Got REVKEYSIG! " << std::endl; WorthlessSigners.push_back(string(buffer+sizeof(GNUPGPREFIX))); } if (strncmp(buffer, GNUPGGOODSIG, sizeof(GNUPGGOODSIG)-1) == 0) { char *sig = buffer + sizeof(GNUPGPREFIX); char *p = sig + sizeof("GOODSIG"); while (*p && isxdigit(*p)) p++; *p = 0; if (Debug == true) std::clog << "Got GOODSIG, key ID:" << sig << std::endl; GoodSigners.push_back(string(sig)); } } fclose(pipein); free(buffer); int status; waitpid(pid, &status, 0); if (Debug == true) { std::clog << "gpgv exited\n"; } if (WEXITSTATUS(status) == 0) { 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 'gpgv' to verify signature (is gpgv installed?)"); else if (WEXITSTATUS(status) == 112) { // 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 return _("Unknown error executing gpgv"); } bool GPGVMethod::Fetch(FetchItem *Itm) { URI Get = Itm->Uri; string Path = Get.Host + Get.Path; // To account for relative paths string keyID; vector<string> GoodSigners; vector<string> BadSigners; // a worthless signature is a expired or revoked one vector<string> WorthlessSigners; 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, WorthlessSigners, NoPubKeySigners); 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() && WorthlessSigners.empty() && NoPubKeySigners.empty()) errmsg = msg; else { if (!BadSigners.empty()) { errmsg += _("The following signatures were invalid:\n"); for (vector<string>::iterator I = BadSigners.begin(); 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(); I != NoPubKeySigners.end(); ++I) errmsg += (*I + "\n"); } } // this is only fatal if we have no good sigs or if we have at // 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("%s", errmsg.c_str()); } // 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()); URIDone(Res); if (_config->FindB("Debug::Acquire::gpgv", false)) { std::clog << "gpgv succeeded\n"; } return true; } int main() { setlocale(LC_ALL, ""); GPGVMethod Mth; return Mth.Run(); }