// Include Files /*{{{*/
#include<config.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 <errno.h>
#include <stdio.h>
+#include <string.h>
#include <stdlib.h>
-#include <sys/stat.h>
-#include <sys/types.h>
#include <fcntl.h>
-
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <iostream>
+#include <string>
#include <vector>
-#include <apt-pkg/error.h>
-#include <apt-pkg/strutl.h>
-#include <apt-pkg/fileutl.h>
-#include <apt-pkg/configuration.h>
-
#include <apti18n.h>
/*}}}*/
-
-using namespace std;
-
-// RunGPGV - returns the command needed for verify /*{{{*/
+static char * GenerateTemporaryFileTemplate(const char *basename) /*{{{*/
+{
+ std::string out;
+ std::string tmpdir = GetTempDir();
+ strprintf(out, "%s/%s.XXXXXX", tmpdir.c_str(), 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. */
+ 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])
+ int const &statusfd, int fd[2])
{
#define EINTERNAL 111
-
- if (File == FileGPG)
- {
- #define SIGMSG "-----BEGIN PGP SIGNED MESSAGE-----\n"
- char buffer[sizeof(SIGMSG)];
- FILE* gpg = fopen(File.c_str(), "r");
- if (gpg == NULL)
- {
- ioprintf(std::cerr, _("Could not open file %s"), File.c_str());
- exit(EINTERNAL);
- }
- char const * const test = fgets(buffer, sizeof(buffer), gpg);
- fclose(gpg);
- if (test == NULL || strcmp(buffer, SIGMSG) != 0)
- {
- ioprintf(std::cerr, _("File %s doesn't start with a clearsigned message"), File.c_str());
- exit(EINTERNAL);
- }
- #undef SIGMSG
- }
-
-
- string const gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv");
+ std::string const gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv");
// FIXME: remove support for deprecated APT::GPGV setting
- string const trustedFile = _config->Find("APT::GPGV::TrustedKeyring", _config->FindFile("Dir::Etc::Trusted"));
- string const trustedPath = _config->FindDir("Dir::Etc::TrustedParts");
+ 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);
std::clog << "Keyring path: " << trustedPath << std::endl;
}
- std::vector<string> keyrings;
+ std::vector<std::string> keyrings;
if (DirectoryExists(trustedPath))
keyrings = GetListOfFilesInDir(trustedPath, "gpg", false, true);
if (RealFileExists(trustedFile) == true)
if (statusfd != -1)
{
Args.push_back("--status-fd");
- snprintf(statusfdstr, sizeof(fd), "%i", statusfd);
+ snprintf(statusfdstr, sizeof(statusfdstr), "%i", statusfd);
Args.push_back(statusfdstr);
}
- for (vector<string>::const_iterator K = keyrings.begin();
+ for (std::vector<std::string>::const_iterator K = keyrings.begin();
K != keyrings.end(); ++K)
{
Args.push_back("--keyring");
}
}
- Args.push_back(FileGPG.c_str());
- if (FileGPG != File)
+ enum { DETACHED, CLEARSIGNED } releaseSignature = (FileGPG != File) ? DETACHED : CLEARSIGNED;
+ std::vector<std::string> dataHeader;
+ char * sig = NULL;
+ char * data = NULL;
+
+ if (releaseSignature == DETACHED)
+ {
+ 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(112);
+ }
+ Args.push_back(sig);
+ Args.push_back(data);
+ }
+
Args.push_back(NULL);
if (Debug == true)
putenv((char *)"LC_MESSAGES=");
}
- execvp(gpgvpath.c_str(), (char **) &Args[0]);
- ioprintf(std::cerr, "Couldn't execute %s to check %s", Args[0], File.c_str());
- exit(EINTERNAL);
+ if (releaseSignature == DETACHED)
+ {
+ 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;
+ 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 (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 == true || found_message_start == false || found_message_end == false)
+ return _error->Error("Splitting of file %s failed as it doesn't contain all expected parts %i %i %i", InFile.c_str(), first_line, found_message_start, found_message_end);
+
+ 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, &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;
}
/*}}}*/
projects / apt.git / blobdiff