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-rw-r--r--apt-pkg/contrib/gpgv.cc385
1 files changed, 385 insertions, 0 deletions
diff --git a/apt-pkg/contrib/gpgv.cc b/apt-pkg/contrib/gpgv.cc
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+// -*- mode: cpp; mode: fold -*-
+// Include Files /*{{{*/
+#include<config.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include<apt-pkg/configuration.h>
+#include<apt-pkg/error.h>
+#include<apt-pkg/strutl.h>
+#include<apt-pkg/fileutl.h>
+#include<apt-pkg/gpgv.h>
+
+#include <apti18n.h>
+ /*}}}*/
+static char * GenerateTemporaryFileTemplate(const char *basename) /*{{{*/
+{
+ const char *tmpdir = getenv("TMPDIR");
+#ifdef P_tmpdir
+ if (!tmpdir)
+ tmpdir = P_tmpdir;
+#endif
+ if (!tmpdir)
+ tmpdir = "/tmp";
+
+ std::string out;
+ strprintf(out, "%s/%s.XXXXXX", tmpdir, basename);
+ return strdup(out.c_str());
+}
+ /*}}}*/
+// ExecGPGV - returns the command needed for verify /*{{{*/
+// ---------------------------------------------------------------------
+/* Generating the commandline for calling gpgv is somehow complicated as
+ we need to add multiple keyrings and user supplied options.
+ Also, as gpgv has no options to enforce a certain reduced style of
+ clear-signed files (=the complete content of the file is signed and
+ the content isn't encoded) we do a divide and conquer approach here
+ and split up the clear-signed file in message and signature for gpgv
+*/
+void ExecGPGV(std::string const &File, std::string const &FileGPG,
+ int const &statusfd, int fd[2])
+{
+ #define EINTERNAL 111
+ std::string const gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv");
+ // FIXME: remove support for deprecated APT::GPGV setting
+ std::string const trustedFile = _config->Find("APT::GPGV::TrustedKeyring", _config->FindFile("Dir::Etc::Trusted"));
+ std::string const trustedPath = _config->FindDir("Dir::Etc::TrustedParts");
+
+ bool const Debug = _config->FindB("Debug::Acquire::gpgv", false);
+
+ if (Debug == true)
+ {
+ std::clog << "gpgv path: " << gpgvpath << std::endl;
+ std::clog << "Keyring file: " << trustedFile << std::endl;
+ std::clog << "Keyring path: " << trustedPath << std::endl;
+ }
+
+ std::vector<std::string> keyrings;
+ if (DirectoryExists(trustedPath))
+ keyrings = GetListOfFilesInDir(trustedPath, "gpg", false, true);
+ if (RealFileExists(trustedFile) == true)
+ keyrings.push_back(trustedFile);
+
+ std::vector<const char *> Args;
+ Args.reserve(30);
+
+ if (keyrings.empty() == true)
+ {
+ // TRANSLATOR: %s is the trusted keyring parts directory
+ ioprintf(std::cerr, _("No keyring installed in %s."),
+ _config->FindDir("Dir::Etc::TrustedParts").c_str());
+ exit(EINTERNAL);
+ }
+
+ Args.push_back(gpgvpath.c_str());
+ Args.push_back("--ignore-time-conflict");
+
+ char statusfdstr[10];
+ if (statusfd != -1)
+ {
+ Args.push_back("--status-fd");
+ snprintf(statusfdstr, sizeof(statusfdstr), "%i", statusfd);
+ Args.push_back(statusfdstr);
+ }
+
+ for (std::vector<std::string>::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());
+ }
+ }
+
+ std::vector<std::string> dataHeader;
+ char * sig = NULL;
+ char * data = NULL;
+
+ // file with detached signature
+ if (FileGPG != File)
+ {
+ Args.push_back(FileGPG.c_str());
+ Args.push_back(File.c_str());
+ }
+ else // clear-signed file
+ {
+ sig = GenerateTemporaryFileTemplate("apt.sig");
+ data = GenerateTemporaryFileTemplate("apt.data");
+ if (sig == NULL || data == NULL)
+ {
+ ioprintf(std::cerr, "Couldn't create tempfile names for splitting up %s", File.c_str());
+ exit(EINTERNAL);
+ }
+
+ int const sigFd = mkstemp(sig);
+ int const dataFd = mkstemp(data);
+ if (sigFd == -1 || dataFd == -1)
+ {
+ if (dataFd != -1)
+ unlink(sig);
+ if (sigFd != -1)
+ unlink(data);
+ ioprintf(std::cerr, "Couldn't create tempfiles for splitting up %s", File.c_str());
+ exit(EINTERNAL);
+ }
+
+ FileFd signature;
+ signature.OpenDescriptor(sigFd, FileFd::WriteOnly, true);
+ FileFd message;
+ message.OpenDescriptor(dataFd, FileFd::WriteOnly, true);
+
+ if (signature.Failed() == true || message.Failed() == true ||
+ SplitClearSignedFile(File, &message, &dataHeader, &signature) == false)
+ {
+ if (dataFd != -1)
+ unlink(sig);
+ if (sigFd != -1)
+ unlink(data);
+ ioprintf(std::cerr, "Splitting up %s into data and signature failed", File.c_str());
+ exit(EINTERNAL);
+ }
+ Args.push_back(sig);
+ Args.push_back(data);
+ }
+
+ Args.push_back(NULL);
+
+ if (Debug == true)
+ {
+ std::clog << "Preparing to exec: " << gpgvpath;
+ for (std::vector<const char *>::const_iterator a = Args.begin(); *a != NULL; ++a)
+ std::clog << " " << *a;
+ std::clog << std::endl;
+ }
+
+ if (statusfd != -1)
+ {
+ int const nullfd = open("/dev/null", O_RDONLY);
+ close(fd[0]);
+ // Redirect output to /dev/null; we read from the status fd
+ if (statusfd != STDOUT_FILENO)
+ dup2(nullfd, STDOUT_FILENO);
+ if (statusfd != STDERR_FILENO)
+ dup2(nullfd, STDERR_FILENO);
+ // Redirect the pipe to the status fd (3)
+ dup2(fd[1], statusfd);
+
+ putenv((char *)"LANG=");
+ putenv((char *)"LC_ALL=");
+ putenv((char *)"LC_MESSAGES=");
+ }
+
+ if (FileGPG != File)
+ {
+ execvp(gpgvpath.c_str(), (char **) &Args[0]);
+ ioprintf(std::cerr, "Couldn't execute %s to check %s", Args[0], File.c_str());
+ exit(EINTERNAL);
+ }
+ else
+ {
+//#define UNLINK_EXIT(X) exit(X)
+#define UNLINK_EXIT(X) unlink(sig);unlink(data);exit(X)
+
+ // for clear-signed files we have created tempfiles we have to clean up
+ // and we do an additional check, so fork yet another time …
+ pid_t pid = ExecFork();
+ if(pid < 0) {
+ ioprintf(std::cerr, "Fork failed for %s to check %s", Args[0], File.c_str());
+ UNLINK_EXIT(EINTERNAL);
+ }
+ if(pid == 0)
+ {
+ if (statusfd != -1)
+ dup2(fd[1], statusfd);
+ execvp(gpgvpath.c_str(), (char **) &Args[0]);
+ ioprintf(std::cerr, "Couldn't execute %s to check %s", Args[0], File.c_str());
+ UNLINK_EXIT(EINTERNAL);
+ }
+
+ // Wait and collect the error code - taken from WaitPid as we need the exact Status
+ int Status;
+ while (waitpid(pid,&Status,0) != pid)
+ {
+ if (errno == EINTR)
+ continue;
+ ioprintf(std::cerr, _("Waited for %s but it wasn't there"), "gpgv");
+ UNLINK_EXIT(EINTERNAL);
+ }
+#undef UNLINK_EXIT
+ // we don't need the files any longer
+ unlink(sig);
+ unlink(data);
+ free(sig);
+ free(data);
+
+ // check if it exit'ed normally …
+ if (WIFEXITED(Status) == false)
+ {
+ ioprintf(std::cerr, _("Sub-process %s exited unexpectedly"), "gpgv");
+ exit(EINTERNAL);
+ }
+
+ // … and with a good exit code
+ if (WEXITSTATUS(Status) != 0)
+ {
+ ioprintf(std::cerr, _("Sub-process %s returned an error code (%u)"), "gpgv", WEXITSTATUS(Status));
+ exit(WEXITSTATUS(Status));
+ }
+
+ // everything fine
+ exit(0);
+ }
+ exit(EINTERNAL); // unreachable safe-guard
+}
+ /*}}}*/
+// SplitClearSignedFile - split message into data/signature /*{{{*/
+bool SplitClearSignedFile(std::string const &InFile, FileFd * const ContentFile,
+ std::vector<std::string> * const ContentHeader, FileFd * const SignatureFile)
+{
+ FILE *in = fopen(InFile.c_str(), "r");
+ if (in == NULL)
+ return _error->Errno("fopen", "can not open %s", InFile.c_str());
+
+ bool found_message_start = false;
+ bool found_message_end = false;
+ bool skip_until_empty_line = false;
+ bool found_signature = false;
+ bool first_line = true;
+
+ char *buf = NULL;
+ size_t buf_size = 0;
+ ssize_t line_len = 0;
+ while ((line_len = getline(&buf, &buf_size, in)) != -1)
+ {
+ _strrstrip(buf);
+ if (found_message_start == false)
+ {
+ if (strcmp(buf, "-----BEGIN PGP SIGNED MESSAGE-----") == 0)
+ {
+ found_message_start = true;
+ skip_until_empty_line = true;
+ }
+ }
+ else if (skip_until_empty_line == true)
+ {
+ if (strlen(buf) == 0)
+ skip_until_empty_line = false;
+ // save "Hash" Armor Headers, others aren't allowed
+ else if (ContentHeader != NULL && strncmp(buf, "Hash: ", strlen("Hash: ")) == 0)
+ ContentHeader->push_back(buf);
+ }
+ else if (found_signature == false)
+ {
+ if (strcmp(buf, "-----BEGIN PGP SIGNATURE-----") == 0)
+ {
+ found_signature = true;
+ found_message_end = true;
+ if (SignatureFile != NULL)
+ {
+ SignatureFile->Write(buf, strlen(buf));
+ SignatureFile->Write("\n", 1);
+ }
+ }
+ else if (found_message_end == false) // we are in the message block
+ {
+ // we don't have any fields which need dash-escaped,
+ // but implementations are free to encode all lines …
+ char const * dashfree = buf;
+ if (strncmp(dashfree, "- ", 2) == 0)
+ dashfree += 2;
+ if(first_line == true) // first line does not need a newline
+ first_line = false;
+ else if (ContentFile != NULL)
+ ContentFile->Write("\n", 1);
+ else
+ continue;
+ if (ContentFile != NULL)
+ ContentFile->Write(dashfree, strlen(dashfree));
+ }
+ }
+ else if (found_signature == true)
+ {
+ if (SignatureFile != NULL)
+ {
+ SignatureFile->Write(buf, strlen(buf));
+ SignatureFile->Write("\n", 1);
+ }
+ if (strcmp(buf, "-----END PGP SIGNATURE-----") == 0)
+ found_signature = false; // look for other signatures
+ }
+ // all the rest is whitespace, unsigned garbage or additional message blocks we ignore
+ }
+ fclose(in);
+
+ if (found_signature == true)
+ return _error->Error("Signature in file %s wasn't closed", InFile.c_str());
+
+ // if we haven't found any of them, this an unsigned file,
+ // so don't generate an error, but splitting was unsuccessful none-the-less
+ if (first_line == true && found_message_start == false && found_message_end == false)
+ return false;
+ // otherwise one missing indicates a syntax error
+ else if (first_line == false || found_message_start == false || found_message_end == false)
+ return _error->Error("Splitting of file %s failed as it doesn't contain all expected parts", InFile.c_str());
+
+ return true;
+}
+ /*}}}*/
+bool OpenMaybeClearSignedFile(std::string const &ClearSignedFileName, FileFd &MessageFile) /*{{{*/
+{
+ char * const message = GenerateTemporaryFileTemplate("fileutl.message");
+ int const messageFd = mkstemp(message);
+ if (messageFd == -1)
+ {
+ free(message);
+ return _error->Errno("mkstemp", "Couldn't create temporary file to work with %s", ClearSignedFileName.c_str());
+ }
+ // we have the fd, thats enough for us
+ unlink(message);
+ free(message);
+
+ MessageFile.OpenDescriptor(messageFd, FileFd::ReadWrite, true);
+ if (MessageFile.Failed() == true)
+ return _error->Error("Couldn't open temporary file to work with %s", ClearSignedFileName.c_str());
+
+ _error->PushToStack();
+ bool const splitDone = SplitClearSignedFile(ClearSignedFileName.c_str(), &MessageFile, NULL, NULL);
+ bool const errorDone = _error->PendingError();
+ _error->MergeWithStack();
+ if (splitDone == false)
+ {
+ MessageFile.Close();
+
+ if (errorDone == true)
+ return false;
+
+ // we deal with an unsigned file
+ MessageFile.Open(ClearSignedFileName, FileFd::ReadOnly);
+ }
+ else // clear-signed
+ {
+ if (MessageFile.Seek(0) == false)
+ return _error->Errno("lseek", "Unable to seek back in message for file %s", ClearSignedFileName.c_str());
+ }
+
+ return MessageFile.Failed() == false;
+}
+ /*}}}*/