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-rw-r--r--apt-pkg/contrib/gpgv.cc363
-rw-r--r--apt-pkg/contrib/gpgv.h77
-rw-r--r--apt-pkg/contrib/strutl.cc8
-rw-r--r--apt-pkg/contrib/strutl.h1
4 files changed, 448 insertions, 1 deletions
diff --git a/apt-pkg/contrib/gpgv.cc b/apt-pkg/contrib/gpgv.cc
new file mode 100644
index 000000000..c236a7289
--- /dev/null
+++ b/apt-pkg/contrib/gpgv.cc
@@ -0,0 +1,363 @@
+// -*- 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>
+ /*}}}*/
+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
+*/
+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());
+ }
+ }
+
+ int sigFd = -1;
+ int dataFd = -1;
+ 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 tempfiles for splitting up %s", File.c_str());
+ exit(EINTERNAL);
+ }
+
+ sigFd = mkstemp(sig);
+ dataFd = mkstemp(data);
+ int const duppedSigFd = dup(sigFd);
+ int const duppedDataFd = dup(dataFd);
+
+ if (dataFd == -1 || sigFd == -1 || duppedDataFd == -1 || duppedSigFd == -1 ||
+ SplitClearSignedFile(File, duppedDataFd, &dataHeader, duppedSigFd) == 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);
+ }
+ lseek(dataFd, 0, SEEK_SET);
+ lseek(sigFd, 0, SEEK_SET);
+ 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);
+ }
+
+ // check if it exit'ed normally …
+ if (WIFEXITED(Status) == false)
+ {
+ ioprintf(std::cerr, _("Sub-process %s exited unexpectedly"), "gpgv");
+ UNLINK_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));
+ UNLINK_EXIT(WEXITSTATUS(Status));
+ }
+
+ /* looks like its fine. Our caller will check the status fd,
+ but we construct a good-known clear-signed file without garbage
+ and other non-sense. In a perfect world, we get the same file,
+ but empty lines, trailing whitespaces and stuff makes it inperfect … */
+ if (RecombineToClearSignedFile(File, dataFd, dataHeader, sigFd) == false)
+ {
+ _error->DumpErrors(std::cerr);
+ UNLINK_EXIT(EINTERNAL);
+ }
+
+ // everything fine, we have a clean file now!
+ UNLINK_EXIT(0);
+#undef UNLINK_EXIT
+ }
+ exit(EINTERNAL); // unreachable safe-guard
+}
+ /*}}}*/
+// RecombineToClearSignedFile - combine data/signature to message /*{{{*/
+bool RecombineToClearSignedFile(std::string const &OutFile, int const ContentFile,
+ std::vector<std::string> const &ContentHeader, int const SignatureFile)
+{
+ FILE *clean_file = fopen(OutFile.c_str(), "w");
+ fputs("-----BEGIN PGP SIGNED MESSAGE-----\n", clean_file);
+ for (std::vector<std::string>::const_iterator h = ContentHeader.begin(); h != ContentHeader.end(); ++h)
+ fprintf(clean_file, "%s\n", h->c_str());
+ fputs("\n", clean_file);
+
+ FILE *data_file = fdopen(ContentFile, "r");
+ FILE *sig_file = fdopen(SignatureFile, "r");
+ if (data_file == NULL || sig_file == NULL)
+ return _error->Error("Couldn't open splitfiles to recombine them into %s", OutFile.c_str());
+ char *buf = NULL;
+ size_t buf_size = 0;
+ while (getline(&buf, &buf_size, data_file) != -1)
+ fputs(buf, clean_file);
+ fclose(data_file);
+ fputs("\n", clean_file);
+ while (getline(&buf, &buf_size, sig_file) != -1)
+ fputs(buf, clean_file);
+ fclose(sig_file);
+ fclose(clean_file);
+ return true;
+}
+ /*}}}*/
+// SplitClearSignedFile - split message into data/signature /*{{{*/
+bool SplitClearSignedFile(std::string const &InFile, int const ContentFile,
+ std::vector<std::string> * const ContentHeader, int const SignatureFile)
+{
+ FILE *in = fopen(InFile.c_str(), "r");
+ if (in == NULL)
+ return _error->Errno("fopen", "can not open %s", InFile.c_str());
+
+ FILE *out_content = NULL;
+ FILE *out_signature = NULL;
+ if (ContentFile != -1)
+ {
+ out_content = fdopen(ContentFile, "w");
+ if (out_content == NULL)
+ return _error->Errno("fdopen", "Failed to open file to write content to from %s", InFile.c_str());
+ }
+ if (SignatureFile != -1)
+ {
+ out_signature = fdopen(SignatureFile, "w");
+ if (out_signature == NULL)
+ return _error->Errno("fdopen", "Failed to open file to write signature to from %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;
+ while (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 (out_signature != NULL)
+ fprintf(out_signature, "%s\n", buf);
+ }
+ else if (found_message_end == false)
+ {
+ // we are in the message block
+ if(first_line == true) // first line does not need a newline
+ {
+ if (out_content != NULL)
+ fprintf(out_content, "%s", buf);
+ first_line = false;
+ }
+ else if (out_content != NULL)
+ fprintf(out_content, "\n%s", buf);
+ }
+ }
+ else if (found_signature == true)
+ {
+ if (out_signature != NULL)
+ fprintf(out_signature, "%s\n", buf);
+ 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
+ }
+ if (out_content != NULL)
+ fclose(out_content);
+ if (out_signature != NULL)
+ fclose(out_signature);
+
+ return true;
+}
diff --git a/apt-pkg/contrib/gpgv.h b/apt-pkg/contrib/gpgv.h
new file mode 100644
index 000000000..8e04855e4
--- /dev/null
+++ b/apt-pkg/contrib/gpgv.h
@@ -0,0 +1,77 @@
+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ Helpers to deal with gpgv better and more easily
+
+ ##################################################################### */
+ /*}}}*/
+#ifndef CONTRIB_GPGV_H
+#define CONTRIB_GPGV_H
+
+#include <string>
+#include <vector>
+
+#if __GNUC__ >= 4
+ #define APT_noreturn __attribute__ ((noreturn))
+#else
+ #define APT_noreturn /* no support */
+#endif
+
+/** \brief generates and run the command to verify a file with gpgv
+ *
+ * If File and FileSig specify the same file it is assumed that we
+ * deal with a clear-signed message. In that case the file will be
+ * rewritten to be in a good-known format without uneeded whitespaces
+ * and additional messages (unsigned or signed).
+ *
+ * @param File is the message (unsigned or clear-signed)
+ * @param FileSig is the signature (detached or clear-signed)
+ */
+void ExecGPGV(std::string const &File, std::string const &FileSig,
+ int const &statusfd, int fd[2]) APT_noreturn;
+inline void ExecGPGV(std::string const &File, std::string const &FileSig,
+ int const &statusfd = -1) {
+ int fd[2];
+ ExecGPGV(File, FileSig, statusfd, fd);
+};
+
+#undef APT_noreturn
+
+/** \brief Split an inline signature into message and signature
+ *
+ * Takes a clear-signed message and puts the first signed message
+ * in the content file and all signatures following it into the
+ * second. Unsigned messages, additional messages as well as
+ * whitespaces are discarded. The resulting files are suitable to
+ * be checked with gpgv.
+ *
+ * If one or all Fds are -1 they will not be used and the content
+ * which would have been written to them is discarded.
+ *
+ * The code doesn't support dash-encoded lines as these are not
+ * expected to be present in files we have to deal with.
+ *
+ * @param InFile is the clear-signed file
+ * @param ContentFile is the Fd the message will be written to
+ * @param ContentHeader is a list of all required Amored Headers for the message
+ * @param SignatureFile is the Fd all signatures will be written to
+ */
+bool SplitClearSignedFile(std::string const &InFile, int const ContentFile,
+ std::vector<std::string> * const ContentHeader, int const SignatureFile);
+
+/** \brief recombines message and signature to an inline signature
+ *
+ * Reverses the splitting down by #SplitClearSignedFile by writing
+ * a well-formed clear-signed message without unsigned messages,
+ * additional signed messages or just trailing whitespaces
+ *
+ * @param OutFile will be clear-signed file
+ * @param ContentFile is the Fd the message will be read from
+ * @param ContentHeader is a list of all required Amored Headers for the message
+ * @param SignatureFile is the Fd all signatures will be read from
+ */
+bool RecombineToClearSignedFile(std::string const &OutFile, int const ContentFile,
+ std::vector<std::string> const &ContentHeader, int const SignatureFile);
+
+#endif
diff --git a/apt-pkg/contrib/strutl.cc b/apt-pkg/contrib/strutl.cc
index ca096d736..9726138a0 100644
--- a/apt-pkg/contrib/strutl.cc
+++ b/apt-pkg/contrib/strutl.cc
@@ -117,7 +117,13 @@ char *_strstrip(char *String)
if (*String == 0)
return String;
-
+ return _strrstrip(String);
+}
+ /*}}}*/
+// strrstrip - Remove white space from the back of a string /*{{{*/
+// ---------------------------------------------------------------------
+char *_strrstrip(char *String)
+{
char *End = String + strlen(String) - 1;
for (;End != String - 1 && (*End == ' ' || *End == '\t' || *End == '\n' ||
*End == '\r'); End--);
diff --git a/apt-pkg/contrib/strutl.h b/apt-pkg/contrib/strutl.h
index 337139d5d..e92f91dc0 100644
--- a/apt-pkg/contrib/strutl.h
+++ b/apt-pkg/contrib/strutl.h
@@ -35,6 +35,7 @@ using std::ostream;
bool UTF8ToCodeset(const char *codeset, const std::string &orig, std::string *dest);
char *_strstrip(char *String);
+char *_strrstrip(char *String); // right strip only
char *_strtabexpand(char *String,size_t Len);
bool ParseQuoteWord(const char *&String,std::string &Res);
bool ParseCWord(const char *&String,std::string &Res);