X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/e7aea3985734af1702fde6e2b0af90b992425334..af9e40c9bfb353b8aea1e2621b3b5a8c1c1db4bd:/methods/gpgv.cc?ds=sidebyside diff --git a/methods/gpgv.cc b/methods/gpgv.cc index a149d67dd..490833d8c 100644 --- a/methods/gpgv.cc +++ b/methods/gpgv.cc @@ -1,19 +1,31 @@ -#include +#include + #include +#include +#include +#include #include #include -#include -#include -#include -#include +#include #include +#include +#include +#include +#include #include -#include -#include +#include +#include +#include +#include #include +#include + +using std::string; +using std::vector; + #define GNUPGPREFIX "[GNUPG:]" #define GNUPGBADSIG "[GNUPG:] BADSIG" #define GNUPGNOPUBKEY "[GNUPG:] NO_PUBKEY" @@ -27,144 +39,65 @@ class GPGVMethod : public pkgAcqMethod { private: string VerifyGetSigners(const char *file, const char *outfile, - vector &GoodSigners, + std::string const &key, + vector &GoodSigners, vector &BadSigners, vector &WorthlessSigners, vector &NoPubKeySigners); protected: - virtual bool Fetch(FetchItem *Itm); - + virtual bool URIAcquire(std::string const &Message, FetchItem *Itm) APT_OVERRIDE; + virtual bool Configuration(string Message) APT_OVERRIDE; public: GPGVMethod() : pkgAcqMethod("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 &GoodSigners, vector &BadSigners, vector &WorthlessSigners, vector &NoPubKeySigners) { bool const Debug = _config->FindB("Debug::Acquire::gpgv", false); - // setup a (empty) stringstream for formating the return value - std::stringstream ret; - ret.str(""); if (Debug == true) std::clog << "inside VerifyGetSigners" << std::endl; - pid_t pid; int fd[2]; - FILE *pipein; - int status; - string const gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv"); - // FIXME: remove support for deprecated APT::GPGV setting - string const trustedFile = _config->FindFile("Dir::Etc::Trusted", - _config->Find("APT::GPGV::TrustedKeyring", "/etc/apt/trusted.gpg").c_str()); - string const trustedPath = _config->FindDir("Dir::Etc::TrustedParts", "/etc/apt/trusted.gpg.d"); - if (Debug == true) - { - std::clog << "gpgv path: " << gpgvpath << std::endl; - std::clog << "Keyring file: " << trustedFile << std::endl; - std::clog << "Keyring path: " << trustedPath << std::endl; - } - - vector keyrings = GetListOfFilesInDir(trustedPath, "gpg", false); - if (FileExists(trustedFile) == true) - keyrings.push_back(trustedFile); - - if (keyrings.empty() == true) - { - // TRANSLATOR: %s is the trusted keyring parts directory - ioprintf(ret, _("No keyring installed in %s."), trustedPath.c_str()); - return ret.str(); - } + bool const keyIsID = (key.empty() == false && key[0] != '/'); if (pipe(fd) < 0) return "Couldn't create pipe"; - pid = fork(); + pid_t pid = fork(); if (pid < 0) return string("Couldn't spawn new process") + strerror(errno); else if (pid == 0) - { - std::vector Args; - Args.reserve(30); - - Args.push_back(gpgvpath.c_str()); - Args.push_back("--status-fd"); - Args.push_back("3"); - Args.push_back("--ignore-time-conflict"); - for (vector::const_iterator K = keyrings.begin(); - K != keyrings.end(); ++K) - { - Args.push_back("--keyring"); - Args.push_back(K->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.push_back(Opts->Value.c_str()); - } - } - Args.push_back(file); - Args.push_back(outfile); - Args.push_back(NULL); - - if (Debug == true) - { - std::clog << "Preparing to exec: " << gpgvpath; - for(std::vector::const_iterator a = Args.begin();*a != NULL; ++a) - std::clog << " " << *a; - std::clog << std::endl; - } - int const 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((char *)"LANG="); - putenv((char *)"LC_ALL="); - putenv((char *)"LC_MESSAGES="); - execvp(gpgvpath.c_str(), (char **) &Args[0]); - - exit(111); - } + ExecGPGV(outfile, file, 3, fd, (keyIsID ? "" : key)); 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 ValidSigners; + size_t buffersize = 0; + char *buffer = NULL; 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 (getline(&buffer, &buffersize, pipein) == -1) + break; if (Debug == true) std::clog << "Read: " << buffer << std::endl; @@ -178,32 +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"); @@ -214,41 +146,92 @@ 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::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 >(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) { - std::clog << "gpgv exited\n"; + ioprintf(std::clog, "gpgv exited with status %i\n", WEXITSTATUS(status)); } 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 _("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 if (WEXITSTATUS(status) == 112) { - ioprintf(ret, _("Could not execute '%s' to verify signature (is gpgv 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, _("Clearsigned file isn't valid, got '%s' (does the network require authentication?)"), "NODATA"); + return errmsg; } else - { - return _("Unknown error executing gpgv"); - } + 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 GoodSigners; vector BadSigners; // a worthless signature is a expired or revoked one @@ -259,8 +242,8 @@ bool GPGVMethod::Fetch(FetchItem *Itm) 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(), + // 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(), key, GoodSigners, BadSigners, WorthlessSigners, NoPubKeySigners); if (GoodSigners.empty() || !BadSigners.empty() || !NoPubKeySigners.empty()) @@ -276,21 +259,21 @@ bool GPGVMethod::Fetch(FetchItem *Itm) { errmsg += _("The following signatures were invalid:\n"); for (vector::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::iterator I = WorthlessSigners.begin(); - I != WorthlessSigners.end(); I++) + 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::iterator I = NoPubKeySigners.begin(); - I != NoPubKeySigners.end(); I++) + I != NoPubKeySigners.end(); ++I) errmsg += (*I + "\n"); } } @@ -311,7 +294,7 @@ bool GPGVMethod::Fetch(FetchItem *Itm) if (_config->FindB("Debug::Acquire::gpgv", false)) { - std::clog << "gpgv succeeded\n"; + std::clog << "apt-key succeeded\n"; } return true; @@ -321,7 +304,7 @@ bool GPGVMethod::Fetch(FetchItem *Itm) int main() { setlocale(LC_ALL, ""); - + GPGVMethod Mth; return Mth.Run();