X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/65977264e88835bd9fded96156264b30d89a128d..84b286f65c55e21b4734a17474f1cba464cbbd9c:/methods/gpgv.cc?ds=sidebyside diff --git a/methods/gpgv.cc b/methods/gpgv.cc index a114ad797..4071cbac6 100644 --- a/methods/gpgv.cc +++ b/methods/gpgv.cc @@ -1,27 +1,45 @@ -#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" #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: - const char *VerifyGetSigners(const char *file, const char *outfile, - vector &GoodSigners, vector &BadSigners, + string VerifyGetSigners(const char *file, const char *outfile, + vector &GoodSigners, + vector &BadSigners, + vector &WorthlessSigners, vector &NoPubKeySigners); protected: @@ -32,98 +50,31 @@ class GPGVMethod : public pkgAcqMethod GPGVMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig) {}; }; -const char *GPGVMethod::VerifyGetSigners(const char *file, const char *outfile, +string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile, vector &GoodSigners, vector &BadSigners, + vector &WorthlessSigners, vector &NoPubKeySigners) { - if (_config->FindB("Debug::Acquire::gpgv", false)) - { - std::cerr << "inside VerifyGetSigners" << std::endl; - } - pid_t pid; - int fd[2]; - FILE *pipein; - int status; - struct stat buff; - string gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv"); - string pubringpath = _config->Find("APT::GPGV::TrustedKeyring", "/etc/apt/trusted.gpg"); - if (_config->FindB("Debug::Acquire::gpgv", false)) - { - std::cerr << "gpgv path: " << gpgvpath << std::endl; - std::cerr << "Keyring path: " << pubringpath << std::endl; - } + bool const Debug = _config->FindB("Debug::Acquire::gpgv", false); - if (stat(pubringpath.c_str(), &buff) != 0) - return (string("Couldn't access keyring: ") + strerror(errno)).c_str(); + if (Debug == true) + std::clog << "inside VerifyGetSigners" << std::endl; + + int fd[2]; 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)).c_str(); - } + return string("Couldn't spawn new process") + strerror(errno); else if (pid == 0) - { - const char *Args[400]; - unsigned int i = 0; - - Args[i++] = gpgvpath.c_str(); - Args[i++] = "--status-fd"; - Args[i++] = "3"; - Args[i++] = "--keyring"; - Args[i++] = pubringpath.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[i++] = Opts->Value.c_str(); - if(i >= 395) { - std::cerr << _("E: Argument list from Acquire::gpgv::Options too long. Exiting.") << std::endl; - exit(111); - } - } - } - Args[i++] = file; - Args[i++] = outfile; - Args[i++] = NULL; - - if (_config->FindB("Debug::Acquire::gpgv", false)) - { - std::cerr << "Preparing to exec: " << gpgvpath; - for(unsigned int j=0;Args[j] != NULL; j++) - std::cerr << " " << Args[j]; - std::cerr << std::endl; - } - int 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("LANG="); - putenv("LC_ALL="); - putenv("LC_MESSAGES="); - execvp(gpgvpath.c_str(), (char **)Args); - - exit(111); - } + ExecGPGV(outfile, file, 3, fd); close(fd[1]); - pipein = fdopen(fd[0], "r"); - + 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); @@ -135,8 +86,16 @@ const char *GPGVMethod::VerifyGetSigners(const char *file, const char *outfile, // Read a line. Sigh. while ((c = getc(pipein)) != EOF && c != '\n') { - if (bufferoff == buffersize) - buffer = (char *) realloc(buffer, buffersize *= 2); + 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++; } @@ -144,8 +103,8 @@ const char *GPGVMethod::VerifyGetSigners(const char *file, const char *outfile, break; *(buffer+bufferoff) = '\0'; bufferoff = 0; - if (_config->FindB("Debug::Acquire::gpgv", false)) - std::cerr << "Read: " << buffer << std::endl; + 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 @@ -153,58 +112,77 @@ const char *GPGVMethod::VerifyGetSigners(const char *file, const char *outfile, // it will be better. if (strncmp(buffer, GNUPGBADSIG, sizeof(GNUPGBADSIG)-1) == 0) { - if (_config->FindB("Debug::Acquire::gpgv", false)) - std::cerr << "Got BADSIG! " << std::endl; + 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 (_config->FindB("Debug::Acquire::gpgv", false)) - std::cerr << "Got NO_PUBKEY " << std::endl; + if (Debug == true) + std::clog << "Got NO_PUBKEY " << std::endl; NoPubKeySigners.push_back(string(buffer+sizeof(GNUPGPREFIX))); } - - if (strncmp(buffer, GNUPGVALIDSIG, sizeof(GNUPGVALIDSIG)-1) == 0) + 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("VALIDSIG"); + char *p = sig + sizeof("GOODSIG"); while (*p && isxdigit(*p)) p++; *p = 0; - if (_config->FindB("Debug::Acquire::gpgv", false)) - std::cerr << "Got VALIDSIG, key ID:" << sig << std::endl; + 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 (_config->FindB("Debug::Acquire::gpgv", false)) + if (Debug == true) { - std::cerr << "gpgv exited\n"; + std::clog << "gpgv exited\n"; } if (WEXITSTATUS(status) == 0) { if (GoodSigners.empty()) return _("Internal error: Good signature, but could not determine key fingerprint?!"); - return NULL; + 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) { - // FIXME String concatenation considered harmful. - return (string(_("Could not execute ")) + gpgvpath + - string(_(" to verify signature (is gnupg installed?)"))).c_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"); - } } bool GPGVMethod::Fetch(FetchItem *Itm) @@ -214,6 +192,8 @@ bool GPGVMethod::Fetch(FetchItem *Itm) string keyID; vector GoodSigners; vector BadSigners; + // a worthless signature is a expired or revoked one + vector WorthlessSigners; vector NoPubKeySigners; FetchResult Res; @@ -221,14 +201,15 @@ bool GPGVMethod::Fetch(FetchItem *Itm) URIStart(Res); // Run gpgv on file, extract contents and get the key ID of the signer - const char *msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(), - GoodSigners, BadSigners, NoPubKeySigners); + 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() && NoPubKeySigners.empty()) + if (BadSigners.empty() && WorthlessSigners.empty() && NoPubKeySigners.empty()) errmsg = msg; else { @@ -236,14 +217,21 @@ 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) 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"); } } @@ -251,26 +239,9 @@ bool GPGVMethod::Fetch(FetchItem *Itm) // 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(errmsg.c_str()); + return _error->Error("%s", errmsg.c_str()); } - // Transfer the modification times - struct stat Buf; - if (stat(Path.c_str(),&Buf) != 0) - return _error->Errno("stat",_("Failed to stat %s"), Path.c_str()); - - struct utimbuf TimeBuf; - TimeBuf.actime = Buf.st_atime; - TimeBuf.modtime = Buf.st_mtime; - if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0) - return _error->Errno("utime",_("Failed to set modification time")); - - if (stat(Itm->DestFile.c_str(),&Buf) != 0) - return _error->Errno("stat",_("Failed to stat")); - - // Return a Done response - Res.LastModified = Buf.st_mtime; - Res.Size = Buf.st_size; // 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. @@ -281,7 +252,7 @@ bool GPGVMethod::Fetch(FetchItem *Itm) if (_config->FindB("Debug::Acquire::gpgv", false)) { - std::cerr << "gpgv succeeded\n"; + std::clog << "gpgv succeeded\n"; } return true; @@ -291,8 +262,10 @@ bool GPGVMethod::Fetch(FetchItem *Itm) int main() { setlocale(LC_ALL, ""); - + GPGVMethod Mth; + Mth.DropPrivsOrDie(); + return Mth.Run(); }