[apt.git] / apt-pkg / contrib / gpgv.cc

// -*- mode: cpp; mode: fold -*-
// 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 <fcntl.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stddef.h>

#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>

#include <apti18n.h>
									/*}}}*/
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 gpg is somehow complicated as
   we need to add multiple keyrings and user supplied options.
   Also, as gpg 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 gpg.
   And as a cherry on the cake, we use our apt-key wrapper to do part
   of the lifting in regards to merging keyrings. Fun for the whole family.
*/
void ExecGPGV(std::string const &File, std::string const &FileGPG,
             int const &statusfd, int fd[2], std::string const &key)
{
   #define EINTERNAL 111
   std::string const aptkey = _config->Find("Dir::Bin::apt-key", CMAKE_INSTALL_FULL_BINDIR "/apt-key");

   bool const Debug = _config->FindB("Debug::Acquire::gpgv", false);
   struct exiter {
      std::vector<const char *> files;
      void operator ()(int code) APT_NORETURN {
	 std::for_each(files.begin(), files.end(), unlink);
	 exit(code);
      }
   } local_exit;


   std::vector<const char *> Args;
   Args.reserve(10);

   Args.push_back(aptkey.c_str());
   Args.push_back("--quiet");
   Args.push_back("--readonly");
   if (key.empty() == false)
   {
      if (key[0] == '/')
      {
	 Args.push_back("--keyring");
	 Args.push_back(key.c_str());
      }
      else
      {
	 Args.push_back("--keyid");
	 Args.push_back(key.c_str());
      }
   }
   Args.push_back("verify");

   char statusfdstr[10];
   if (statusfd != -1)
   {
      Args.push_back("--status-fd");
      snprintf(statusfdstr, sizeof(statusfdstr), "%i", statusfd);
      Args.push_back(statusfdstr);
   }

   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());
      }
   }

   enum  { DETACHED, CLEARSIGNED } releaseSignature = (FileGPG != File) ? DETACHED : CLEARSIGNED;
   std::vector<std::string> dataHeader;
   char * sig = NULL;
   char * data = NULL;
   char * conf = nullptr;

   // Dump the configuration so apt-key picks up the correct Dir values
   {
      conf = GenerateTemporaryFileTemplate("apt.conf");
      if (conf == nullptr) {
	 ioprintf(std::cerr, "Couldn't create tempfile names for passing config to apt-key");
	 local_exit(EINTERNAL);
      }
      int confFd = mkstemp(conf);
      if (confFd == -1) {
	 ioprintf(std::cerr, "Couldn't create temporary file %s for passing config to apt-key", conf);
	 local_exit(EINTERNAL);
      }
      local_exit.files.push_back(conf);

      std::ofstream confStream(conf);
      close(confFd);
      _config->Dump(confStream);
      confStream.close();
      setenv("APT_CONFIG", conf, 1);
   }

   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());
	 local_exit(EINTERNAL);
      }

      int const sigFd = mkstemp(sig);
      int const dataFd = mkstemp(data);
      if (dataFd != -1)
	 local_exit.files.push_back(data);
      if (sigFd != -1)
	 local_exit.files.push_back(sig);
      if (sigFd == -1 || dataFd == -1)
      {
	 ioprintf(std::cerr, "Couldn't create tempfiles for splitting up %s", File.c_str());
	 local_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)
      {
	 ioprintf(std::cerr, "Splitting up %s into data and signature failed", File.c_str());
	 local_exit(112);
      }
      Args.push_back(sig);
      Args.push_back(data);
   }

   Args.push_back(NULL);

   if (Debug == true)
   {
      std::clog << "Preparing to exec: ";
      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_WRONLY);
      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=");
   }


   // 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());
      local_exit(EINTERNAL);
   }
   if(pid == 0)
   {
      if (statusfd != -1)
	 dup2(fd[1], statusfd);
      execvp(Args[0], (char **) &Args[0]);
      ioprintf(std::cerr, "Couldn't execute %s to check %s", Args[0], File.c_str());
      local_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"), "apt-key");
      local_exit(EINTERNAL);
   }

   // check if it exit'ed normally …
   if (WIFEXITED(Status) == false)
   {
      ioprintf(std::cerr, _("Sub-process %s exited unexpectedly"), "apt-key");
      local_exit(EINTERNAL);
   }

   // … and with a good exit code
   if (WEXITSTATUS(Status) != 0)
   {
      ioprintf(std::cerr, _("Sub-process %s returned an error code (%u)"), "apt-key", WEXITSTATUS(Status));
      local_exit(WEXITSTATUS(Status));
   }

   // everything fine
   local_exit(0);
}
									/*}}}*/
// 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 (buf != NULL)
      free(buf);

   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 | FileFd::BufferedWrite, 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;
}
									/*}}}*/
Commit	Line	Data
2f5b6151 DK	1	// -- mode: cpp; mode: fold --
	2	// Include Files /{{{/
	3	#include<config.h>
	4
453b82a3 DK	5	#include<apt-pkg/configuration.h>
	6	#include<apt-pkg/error.h>
	7	#include<apt-pkg/strutl.h>
	8	#include<apt-pkg/fileutl.h>
	9	#include<apt-pkg/gpgv.h>
	10
2d3fe9cf	11	#include <errno.h>
b38bb727	12	#include <stdio.h>
2d3fe9cf	13	#include <string.h>
b38bb727	14	#include <stdlib.h>
2d3fe9cf	15	#include <fcntl.h>
2d3fe9cf	16	#include <sys/wait.h>
38beb8b5	17	#include <unistd.h>
453b82a3	18	#include <stddef.h>
b0d40854 DK	19
b0d40854 DK	20	#include <algorithm>
98f884eb	21	#include <fstream>
453b82a3 DK	22	#include <iostream>
	23	#include <string>
	24	#include <vector>
2f5b6151 DK	25
	26	#include <apti18n.h>
	27	/}}}/
f1828b69	28	static char * GenerateTemporaryFileTemplate(const char basename) /{{{*/
2d3fe9cf	29	{
2d3fe9cf	30	std::string out;
68e01721 MV	31	std::string tmpdir = GetTempDir();
68e01721 MV	32	strprintf(out, "%s/%s.XXXXXX", tmpdir.c_str(), basename);
2d3fe9cf DK	33	return strdup(out.c_str());
	34	}
	35	/}}}/
	36	// ExecGPGV - returns the command needed for verify /{{{/
2f5b6151	37	// ---------------------------------------------------------------------
12841e83	38	/* Generating the commandline for calling gpg is somehow complicated as
2d3fe9cf	39	we need to add multiple keyrings and user supplied options.
12841e83	40	Also, as gpg has no options to enforce a certain reduced style of
2d3fe9cf DK	41	clear-signed files (=the complete content of the file is signed and
2d3fe9cf DK	42	the content isn't encoded) we do a divide and conquer approach here
12841e83 DK	43	and split up the clear-signed file in message and signature for gpg.
	44	And as a cherry on the cake, we use our apt-key wrapper to do part
	45	of the lifting in regards to merging keyrings. Fun for the whole family.
2d3fe9cf	46	*/
99ed26d3	47	void ExecGPGV(std::string const &File, std::string const &FileGPG,
b0d40854	48	int const &statusfd, int fd[2], std::string const &key)
2f5b6151	49	{
99ed26d3	50	#define EINTERNAL 111
8757a0fd	51	std::string const aptkey = _config->Find("Dir::Bin::apt-key", CMAKE_INSTALL_FULL_BINDIR "/apt-key");
2f5b6151 DK	52
2f5b6151 DK	53	bool const Debug = _config->FindB("Debug::Acquire::gpgv", false);
e0a243f3 JAK	54	struct exiter {
	55	std::vector<const char *> files;
	56	void operator ()(int code) APT_NORETURN {
	57	std::for_each(files.begin(), files.end(), unlink);
	58	exit(code);
	59	}
	60	} local_exit;
	61
2f5b6151	62
2f5b6151	63	std::vector<const char *> Args;
12841e83	64	Args.reserve(10);
2f5b6151	65
12841e83 DK	66	Args.push_back(aptkey.c_str());
12841e83 DK	67	Args.push_back("--quiet");
33a22672	68	Args.push_back("--readonly");
b0d40854 DK	69	if (key.empty() == false)
	70	{
	71	if (key[0] == '/')
	72	{
	73	Args.push_back("--keyring");
	74	Args.push_back(key.c_str());
	75	}
	76	else
	77	{
	78	Args.push_back("--keyid");
	79	Args.push_back(key.c_str());
	80	}
	81	}
c46a36ad	82	Args.push_back("verify");
2f5b6151	83
b38bb727	84	char statusfdstr[10];
2f5b6151 DK	85	if (statusfd != -1)
	86	{
	87	Args.push_back("--status-fd");
2d3fe9cf	88	snprintf(statusfdstr, sizeof(statusfdstr), "%i", statusfd);
b38bb727	89	Args.push_back(statusfdstr);
2f5b6151 DK	90	}
2f5b6151 DK	91
2f5b6151 DK	92	Configuration::Item const *Opts;
	93	Opts = _config->Tree("Acquire::gpgv::Options");
	94	if (Opts != 0)
	95	{
	96	Opts = Opts->Child;
	97	for (; Opts != 0; Opts = Opts->Next)
	98	{
	99	if (Opts->Value.empty() == true)
	100	continue;
	101	Args.push_back(Opts->Value.c_str());
	102	}
	103	}
	104
62d8a765	105	enum { DETACHED, CLEARSIGNED } releaseSignature = (FileGPG != File) ? DETACHED : CLEARSIGNED;
2d3fe9cf DK	106	std::vector<std::string> dataHeader;
	107	char * sig = NULL;
	108	char * data = NULL;
98f884eb JAK	109	char * conf = nullptr;
	110
	111	// Dump the configuration so apt-key picks up the correct Dir values
	112	{
	113	conf = GenerateTemporaryFileTemplate("apt.conf");
	114	if (conf == nullptr) {
	115	ioprintf(std::cerr, "Couldn't create tempfile names for passing config to apt-key");
	116	local_exit(EINTERNAL);
	117	}
	118	int confFd = mkstemp(conf);
	119	if (confFd == -1) {
	120	ioprintf(std::cerr, "Couldn't create temporary file %s for passing config to apt-key", conf);
	121	local_exit(EINTERNAL);
	122	}
	123	local_exit.files.push_back(conf);
	124
	125	std::ofstream confStream(conf);
	126	close(confFd);
	127	_config->Dump(confStream);
	128	confStream.close();
	129	setenv("APT_CONFIG", conf, 1);
	130	}
2d3fe9cf	131
62d8a765	132	if (releaseSignature == DETACHED)
2d3fe9cf DK	133	{
2d3fe9cf DK	134	Args.push_back(FileGPG.c_str());
2f5b6151	135	Args.push_back(File.c_str());
2d3fe9cf DK	136	}
	137	else // clear-signed file
	138	{
	139	sig = GenerateTemporaryFileTemplate("apt.sig");
	140	data = GenerateTemporaryFileTemplate("apt.data");
	141	if (sig == NULL \|\| data == NULL)
	142	{
b408e4ad	143	ioprintf(std::cerr, "Couldn't create tempfile names for splitting up %s", File.c_str());
e0a243f3	144	local_exit(EINTERNAL);
b408e4ad DK	145	}
	146
	147	int const sigFd = mkstemp(sig);
	148	int const dataFd = mkstemp(data);
e0a243f3 JAK	149	if (dataFd != -1)
	150	local_exit.files.push_back(data);
	151	if (sigFd != -1)
	152	local_exit.files.push_back(sig);
b408e4ad DK	153	if (sigFd == -1 \|\| dataFd == -1)
b408e4ad DK	154	{
2d3fe9cf	155	ioprintf(std::cerr, "Couldn't create tempfiles for splitting up %s", File.c_str());
e0a243f3	156	local_exit(EINTERNAL);
2d3fe9cf DK	157	}
2d3fe9cf DK	158
b408e4ad DK	159	FileFd signature;
	160	signature.OpenDescriptor(sigFd, FileFd::WriteOnly, true);
	161	FileFd message;
	162	message.OpenDescriptor(dataFd, FileFd::WriteOnly, true);
2d3fe9cf	163
b408e4ad DK	164	if (signature.Failed() == true \|\| message.Failed() == true \|\|
b408e4ad DK	165	SplitClearSignedFile(File, &message, &dataHeader, &signature) == false)
2d3fe9cf	166	{
2d3fe9cf	167	ioprintf(std::cerr, "Splitting up %s into data and signature failed", File.c_str());
e0a243f3	168	local_exit(112);
2d3fe9cf	169	}
2d3fe9cf DK	170	Args.push_back(sig);
	171	Args.push_back(data);
	172	}
	173
2f5b6151 DK	174	Args.push_back(NULL);
	175
	176	if (Debug == true)
	177	{
12841e83	178	std::clog << "Preparing to exec: ";
2f5b6151 DK	179	for (std::vector<const char >::const_iterator a = Args.begin(); a != NULL; ++a)
	180	std::clog << " " << *a;
	181	std::clog << std::endl;
	182	}
	183
	184	if (statusfd != -1)
	185	{
12841e83	186	int const nullfd = open("/dev/null", O_WRONLY);
2f5b6151 DK	187	close(fd[0]);
2f5b6151 DK	188	// Redirect output to /dev/null; we read from the status fd
b38bb727 DK	189	if (statusfd != STDOUT_FILENO)
	190	dup2(nullfd, STDOUT_FILENO);
	191	if (statusfd != STDERR_FILENO)
	192	dup2(nullfd, STDERR_FILENO);
2f5b6151 DK	193	// Redirect the pipe to the status fd (3)
	194	dup2(fd[1], statusfd);
	195
	196	putenv((char *)"LANG=");
	197	putenv((char *)"LC_ALL=");
	198	putenv((char *)"LC_MESSAGES=");
	199	}
	200
81ee750f JAK	201
	202	// We have created tempfiles we have to clean up
	203	// and we do an additional check, so fork yet another time …
	204	pid_t pid = ExecFork();
	205	if(pid < 0) {
	206	ioprintf(std::cerr, "Fork failed for %s to check %s", Args[0], File.c_str());
	207	local_exit(EINTERNAL);
	208	}
	209	if(pid == 0)
2d3fe9cf	210	{
81ee750f JAK	211	if (statusfd != -1)
81ee750f JAK	212	dup2(fd[1], statusfd);
12841e83	213	execvp(Args[0], (char **) &Args[0]);
2d3fe9cf	214	ioprintf(std::cerr, "Couldn't execute %s to check %s", Args[0], File.c_str());
e0a243f3	215	local_exit(EINTERNAL);
2d3fe9cf	216	}
2d3fe9cf	217
81ee750f JAK	218	// Wait and collect the error code - taken from WaitPid as we need the exact Status
	219	int Status;
	220	while (waitpid(pid,&Status,0) != pid)
	221	{
	222	if (errno == EINTR)
	223	continue;
	224	ioprintf(std::cerr, _("Waited for %s but it wasn't there"), "apt-key");
	225	local_exit(EINTERNAL);
	226	}
2d3fe9cf	227
81ee750f JAK	228	// check if it exit'ed normally …
	229	if (WIFEXITED(Status) == false)
	230	{
	231	ioprintf(std::cerr, _("Sub-process %s exited unexpectedly"), "apt-key");
	232	local_exit(EINTERNAL);
	233	}
2d3fe9cf	234
81ee750f JAK	235	// … and with a good exit code
	236	if (WEXITSTATUS(Status) != 0)
	237	{
	238	ioprintf(std::cerr, _("Sub-process %s returned an error code (%u)"), "apt-key", WEXITSTATUS(Status));
	239	local_exit(WEXITSTATUS(Status));
2d3fe9cf	240	}
81ee750f JAK	241
	242	// everything fine
	243	local_exit(0);
2d3fe9cf DK	244	}
2d3fe9cf DK	245	/}}}/
2d3fe9cf	246	// SplitClearSignedFile - split message into data/signature /{{{/
b408e4ad DK	247	bool SplitClearSignedFile(std::string const &InFile, FileFd * const ContentFile,
b408e4ad DK	248	std::vector<std::string> * const ContentHeader, FileFd * const SignatureFile)
2d3fe9cf DK	249	{
	250	FILE *in = fopen(InFile.c_str(), "r");
	251	if (in == NULL)
	252	return _error->Errno("fopen", "can not open %s", InFile.c_str());
	253
2d3fe9cf DK	254	bool found_message_start = false;
	255	bool found_message_end = false;
	256	bool skip_until_empty_line = false;
	257	bool found_signature = false;
	258	bool first_line = true;
	259
	260	char *buf = NULL;
	261	size_t buf_size = 0;
9ce3cfc9	262	while (getline(&buf, &buf_size, in) != -1)
2d3fe9cf DK	263	{
	264	_strrstrip(buf);
	265	if (found_message_start == false)
	266	{
	267	if (strcmp(buf, "-----BEGIN PGP SIGNED MESSAGE-----") == 0)
	268	{
	269	found_message_start = true;
	270	skip_until_empty_line = true;
	271	}
	272	}
	273	else if (skip_until_empty_line == true)
	274	{
	275	if (strlen(buf) == 0)
	276	skip_until_empty_line = false;
	277	// save "Hash" Armor Headers, others aren't allowed
	278	else if (ContentHeader != NULL && strncmp(buf, "Hash: ", strlen("Hash: ")) == 0)
	279	ContentHeader->push_back(buf);
	280	}
	281	else if (found_signature == false)
	282	{
	283	if (strcmp(buf, "-----BEGIN PGP SIGNATURE-----") == 0)
	284	{
	285	found_signature = true;
	286	found_message_end = true;
b408e4ad DK	287	if (SignatureFile != NULL)
	288	{
	289	SignatureFile->Write(buf, strlen(buf));
	290	SignatureFile->Write("\n", 1);
	291	}
2d3fe9cf	292	}
cb323489	293	else if (found_message_end == false) // we are in the message block
2d3fe9cf	294	{
cb323489 DK	295	// we don't have any fields which need dash-escaped,
	296	// but implementations are free to encode all lines …
	297	char const * dashfree = buf;
	298	if (strncmp(dashfree, "- ", 2) == 0)
	299	dashfree += 2;
2d3fe9cf	300	if(first_line == true) // first line does not need a newline
2d3fe9cf	301	first_line = false;
b408e4ad	302	else if (ContentFile != NULL)
b408e4ad	303	ContentFile->Write("\n", 1);
cb323489 DK	304	else
	305	continue;
	306	if (ContentFile != NULL)
	307	ContentFile->Write(dashfree, strlen(dashfree));
2d3fe9cf DK	308	}
	309	}
	310	else if (found_signature == true)
	311	{
b408e4ad DK	312	if (SignatureFile != NULL)
	313	{
	314	SignatureFile->Write(buf, strlen(buf));
	315	SignatureFile->Write("\n", 1);
	316	}
2d3fe9cf DK	317	if (strcmp(buf, "-----END PGP SIGNATURE-----") == 0)
	318	found_signature = false; // look for other signatures
	319	}
	320	// all the rest is whitespace, unsigned garbage or additional message blocks we ignore
	321	}
bea263c2	322	fclose(in);
3d8232bf DK	323	if (buf != NULL)
3d8232bf DK	324	free(buf);
2d3fe9cf	325
f1828b69 DK	326	if (found_signature == true)
	327	return _error->Error("Signature in file %s wasn't closed", InFile.c_str());
	328
	329	// if we haven't found any of them, this an unsigned file,
	330	// so don't generate an error, but splitting was unsuccessful none-the-less
cb323489	331	if (first_line == true && found_message_start == false && found_message_end == false)
f1828b69 DK	332	return false;
f1828b69 DK	333	// otherwise one missing indicates a syntax error
463f24f9 MV	334	else if (first_line == true \|\| found_message_start == false \|\| found_message_end == false)
463f24f9 MV	335	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);
f1828b69	336
2d3fe9cf DK	337	return true;
2d3fe9cf DK	338	}
f1828b69 DK	339	/}}}/
	340	bool OpenMaybeClearSignedFile(std::string const &ClearSignedFileName, FileFd &MessageFile) /{{{/
	341	{
	342	char * const message = GenerateTemporaryFileTemplate("fileutl.message");
	343	int const messageFd = mkstemp(message);
	344	if (messageFd == -1)
	345	{
	346	free(message);
	347	return _error->Errno("mkstemp", "Couldn't create temporary file to work with %s", ClearSignedFileName.c_str());
	348	}
	349	// we have the fd, thats enough for us
	350	unlink(message);
	351	free(message);
	352
46c4043d	353	MessageFile.OpenDescriptor(messageFd, FileFd::ReadWrite \| FileFd::BufferedWrite, true);
b408e4ad DK	354	if (MessageFile.Failed() == true)
b408e4ad DK	355	return _error->Error("Couldn't open temporary file to work with %s", ClearSignedFileName.c_str());
f1828b69 DK	356
f1828b69 DK	357	_error->PushToStack();
9ce3cfc9	358	bool const splitDone = SplitClearSignedFile(ClearSignedFileName, &MessageFile, NULL, NULL);
f1828b69 DK	359	bool const errorDone = _error->PendingError();
	360	_error->MergeWithStack();
	361	if (splitDone == false)
	362	{
b408e4ad	363	MessageFile.Close();
f1828b69 DK	364
	365	if (errorDone == true)
	366	return false;
	367
	368	// we deal with an unsigned file
	369	MessageFile.Open(ClearSignedFileName, FileFd::ReadOnly);
	370	}
	371	else // clear-signed
	372	{
b408e4ad DK	373	if (MessageFile.Seek(0) == false)
b408e4ad DK	374	return _error->Errno("lseek", "Unable to seek back in message for file %s", ClearSignedFileName.c_str());
f1828b69 DK	375	}
	376
	377	return MessageFile.Failed() == false;
	378	}
	379	/}}}/