[ntk/apt.git] / methods / gpgv.cc

#include <apt-pkg/error.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/indexcopy.h>
#include <apti18n.h>

#include <utime.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/wait.h>
#include <iostream>
#include <sstream>

#include <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:
   string VerifyGetSigners(const char *file, const char *outfile,
				vector<string> &GoodSigners, 
                                vector<string> &BadSigners,
                                vector<string> &WorthlessSigners,
				vector<string> &NoPubKeySigners);
   
   protected:
   virtual bool Fetch(FetchItem *Itm);
   
   public:
   
   GPGVMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig) {};
};

string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
					 vector<string> &GoodSigners,
					 vector<string> &BadSigners,
					 vector<string> &WorthlessSigners,
					 vector<string> &NoPubKeySigners)
{
   bool const Debug = _config->FindB("Debug::Acquire::gpgv", false);
   // setup a (empty) stringstream for formating the return value
   std::stringstream ret;
   ret.str("");

   if (Debug == true)
      std::clog << "inside VerifyGetSigners" << std::endl;

   pid_t pid;
   int fd[2];
   FILE *pipein;
   int status;

   string const gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv");
   std::vector<const char*> Args = SigVerify::GetGPGVCommandLine();
   if (Args.empty() == true)
   {
      // TRANSLATOR: %s is the trusted keyring parts directory
      ioprintf(ret, _("No keyring installed in %s."),
		_config->FindDir("Dir::Etc::TrustedParts", "/etc/apt/trusted.gpg.d").c_str());
      return ret.str();
   }

   if (pipe(fd) < 0)
      return "Couldn't create pipe";

   pid = fork();
   if (pid < 0)
      return string("Couldn't spawn new process") + strerror(errno);
   else if (pid == 0)
   {
      Args.push_back("--status-fd");
      Args.push_back("3");
      Args.push_back(file);
      Args.push_back(outfile);
      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;
      }
      int const 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((char *)"LANG=");
      putenv((char *)"LC_ALL=");
      putenv((char *)"LC_MESSAGES=");
      execvp(gpgvpath.c_str(), (char **) &Args[0]);
             
      exit(111);
   }
   close(fd[1]);

   pipein = fdopen(fd[0], "r"); 
   
   // Loop over the output of gpgv, and check the signatures.
   size_t buffersize = 64;
   char *buffer = (char *) malloc(buffersize);
   size_t bufferoff = 0;
   while (1)
   {
      int c;

      // Read a line.  Sigh.
      while ((c = getc(pipein)) != EOF && c != '\n')
      {
         if (bufferoff == buffersize)
            buffer = (char *) realloc(buffer, buffersize *= 2);
         *(buffer+bufferoff) = c;
         bufferoff++;
      }
      if (bufferoff == 0 && c == EOF)
         break;
      *(buffer+bufferoff) = '\0';
      bufferoff = 0;
      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
      // if we improve the apt method communication stuff later
      // it will be better.
      if (strncmp(buffer, GNUPGBADSIG, sizeof(GNUPGBADSIG)-1) == 0)
      {
         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 (Debug == true)
            std::clog << "Got NO_PUBKEY " << std::endl;
         NoPubKeySigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
      }
      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("GOODSIG");
         while (*p && isxdigit(*p)) 
            p++;
         *p = 0;
         if (Debug == true)
            std::clog << "Got GOODSIG, key ID:" << sig << std::endl;
         GoodSigners.push_back(string(sig));
      }
   }
   fclose(pipein);

   waitpid(pid, &status, 0);
   if (Debug == true)
   {
      std::clog << "gpgv exited\n";
   }
   
   if (WEXITSTATUS(status) == 0)
   {
      if (GoodSigners.empty())
         return _("Internal error: Good signature, but could not determine key fingerprint?!");
      return "";
   }
   else if (WEXITSTATUS(status) == 1)
   {
      return _("At least one invalid signature was encountered.");
   }
   else if (WEXITSTATUS(status) == 111)
   {
      ioprintf(ret, _("Could not execute '%s' to verify signature (is gpgv installed?)"), gpgvpath.c_str());
      return ret.str();
   }
   else
   {
      return _("Unknown error executing gpgv");
   }
}

bool GPGVMethod::Fetch(FetchItem *Itm)
{
   URI Get = Itm->Uri;
   string Path = Get.Host + Get.Path; // To account for relative paths
   string keyID;
   vector<string> GoodSigners;
   vector<string> BadSigners;
   // a worthless signature is a expired or revoked one
   vector<string> WorthlessSigners;
   vector<string> NoPubKeySigners;
   
   FetchResult Res;
   Res.Filename = Itm->DestFile;
   URIStart(Res);

   // Run gpgv on file, extract contents and get the key ID of the signer
   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() && WorthlessSigners.empty() && NoPubKeySigners.empty())
         errmsg = msg;
      else
      {
         if (!BadSigners.empty())
         {
            errmsg += _("The following signatures were invalid:\n");
            for (vector<string>::iterator I = BadSigners.begin();
		 I != BadSigners.end(); I++)
               errmsg += (*I + "\n");
         }
         if (!WorthlessSigners.empty())
         {
            errmsg += _("The following signatures were invalid:\n");
            for (vector<string>::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<string>::iterator I = NoPubKeySigners.begin();
		 I != NoPubKeySigners.end(); I++)
               errmsg += (*I + "\n");
         }
      }
      // this is only fatal if we have no good sigs or if we have at
      // 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("%s", errmsg.c_str());
   }
      
   // 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.
   Res.GPGVOutput = GoodSigners;
   Res.GPGVOutput.insert(Res.GPGVOutput.end(),BadSigners.begin(),BadSigners.end());
   Res.GPGVOutput.insert(Res.GPGVOutput.end(),NoPubKeySigners.begin(),NoPubKeySigners.end());
   URIDone(Res);

   if (_config->FindB("Debug::Acquire::gpgv", false))
   {
      std::clog << "gpgv succeeded\n";
   }

   return true;
}


int main()
{
   setlocale(LC_ALL, "");
   
   GPGVMethod Mth;

   return Mth.Run();
}
Commit	Line	Data
b3d44315 MV	1	#include <apt-pkg/error.h>
	2	#include <apt-pkg/acquire-method.h>
	3	#include <apt-pkg/strutl.h>
46e39c8e	4	#include <apt-pkg/fileutl.h>
a319c4ee	5	#include <apt-pkg/indexcopy.h>
339690e4	6	#include <apti18n.h>
b3d44315	7
b3d44315 MV	8	#include <utime.h>
	9	#include <stdio.h>
	10	#include <fcntl.h>
	11	#include <errno.h>
	12	#include <sys/wait.h>
	13	#include <iostream>
da9ed163	14	#include <sstream>
b3d44315	15
f5a3d009 DK	16	#include <vector>
f5a3d009 DK	17
b3d44315 MV	18	#define GNUPGPREFIX "[GNUPG:]"
	19	#define GNUPGBADSIG "[GNUPG:] BADSIG"
	20	#define GNUPGNOPUBKEY "[GNUPG:] NO_PUBKEY"
	21	#define GNUPGVALIDSIG "[GNUPG:] VALIDSIG"
c5d8878d MV	22	#define GNUPGGOODSIG "[GNUPG:] GOODSIG"
	23	#define GNUPGKEYEXPIRED "[GNUPG:] KEYEXPIRED"
	24	#define GNUPGREVKEYSIG "[GNUPG:] REVKEYSIG"
2abb68b7	25	#define GNUPGNODATA "[GNUPG:] NODATA"
b3d44315 MV	26
	27	class GPGVMethod : public pkgAcqMethod
	28	{
	29	private:
da9ed163	30	string VerifyGetSigners(const char file, const char outfile,
c5d8878d MV	31	vector<string> &GoodSigners,
	32	vector<string> &BadSigners,
	33	vector<string> &WorthlessSigners,
b3d44315 MV	34	vector<string> &NoPubKeySigners);
	35
	36	protected:
	37	virtual bool Fetch(FetchItem *Itm);
	38
	39	public:
	40
	41	GPGVMethod() : pkgAcqMethod("1.0",SingleInstance \| SendConfig) {};
	42	};
	43
da9ed163	44	string GPGVMethod::VerifyGetSigners(const char file, const char outfile,
b3d44315 MV	45	vector<string> &GoodSigners,
b3d44315 MV	46	vector<string> &BadSigners,
c5d8878d	47	vector<string> &WorthlessSigners,
b3d44315 MV	48	vector<string> &NoPubKeySigners)
b3d44315 MV	49	{
46e39c8e	50	bool const Debug = _config->FindB("Debug::Acquire::gpgv", false);
da9ed163 MV	51	// setup a (empty) stringstream for formating the return value
da9ed163 MV	52	std::stringstream ret;
b2c22075	53	ret.str("");
da9ed163	54
46e39c8e MV	55	if (Debug == true)
	56	std::clog << "inside VerifyGetSigners" << std::endl;
	57
b3d44315 MV	58	pid_t pid;
	59	int fd[2];
	60	FILE *pipein;
	61	int status;
46e39c8e	62
a319c4ee DK	63	string const gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv");
	64	std::vector<const char*> Args = SigVerify::GetGPGVCommandLine();
	65	if (Args.empty() == true)
da9ed163	66	{
46e39c8e	67	// TRANSLATOR: %s is the trusted keyring parts directory
a319c4ee DK	68	ioprintf(ret, _("No keyring installed in %s."),
a319c4ee DK	69	_config->FindDir("Dir::Etc::TrustedParts", "/etc/apt/trusted.gpg.d").c_str());
da9ed163 MV	70	return ret.str();
da9ed163 MV	71	}
46e39c8e	72
b3d44315	73	if (pipe(fd) < 0)
b3d44315	74	return "Couldn't create pipe";
b3d44315 MV	75
	76	pid = fork();
	77	if (pid < 0)
da9ed163	78	return string("Couldn't spawn new process") + strerror(errno);
b3d44315 MV	79	else if (pid == 0)
b3d44315 MV	80	{
f5a3d009 DK	81	Args.push_back("--status-fd");
f5a3d009 DK	82	Args.push_back("3");
f5a3d009 DK	83	Args.push_back(file);
	84	Args.push_back(outfile);
	85	Args.push_back(NULL);
ad6a45d8	86
46e39c8e	87	if (Debug == true)
b3d44315	88	{
46e39c8e	89	std::clog << "Preparing to exec: " << gpgvpath;
f5a3d009 DK	90	for(std::vector<const char >::const_iterator a = Args.begin();a != NULL; ++a)
f5a3d009 DK	91	std::clog << " " << *a;
46e39c8e	92	std::clog << std::endl;
b3d44315	93	}
46e39c8e	94	int const nullfd = open("/dev/null", O_RDONLY);
b3d44315 MV	95	close(fd[0]);
	96	// Redirect output to /dev/null; we read from the status fd
	97	dup2(nullfd, STDOUT_FILENO);
	98	dup2(nullfd, STDERR_FILENO);
	99	// Redirect the pipe to the status fd (3)
	100	dup2(fd[1], 3);
	101
31c64df3 OS	102	putenv((char *)"LANG=");
	103	putenv((char *)"LC_ALL=");
	104	putenv((char *)"LC_MESSAGES=");
f5a3d009	105	execvp(gpgvpath.c_str(), (char **) &Args[0]);
b3d44315 MV	106
	107	exit(111);
	108	}
	109	close(fd[1]);
	110
	111	pipein = fdopen(fd[0], "r");
	112
	113	// Loop over the output of gpgv, and check the signatures.
	114	size_t buffersize = 64;
	115	char buffer = (char ) malloc(buffersize);
	116	size_t bufferoff = 0;
	117	while (1)
	118	{
	119	int c;
	120
	121	// Read a line. Sigh.
	122	while ((c = getc(pipein)) != EOF && c != '\n')
	123	{
	124	if (bufferoff == buffersize)
	125	buffer = (char ) realloc(buffer, buffersize = 2);
	126	*(buffer+bufferoff) = c;
	127	bufferoff++;
	128	}
	129	if (bufferoff == 0 && c == EOF)
	130	break;
	131	*(buffer+bufferoff) = '\0';
	132	bufferoff = 0;
46e39c8e MV	133	if (Debug == true)
46e39c8e MV	134	std::clog << "Read: " << buffer << std::endl;
b3d44315 MV	135
	136	// Push the data into three separate vectors, which
	137	// we later concatenate. They're kept separate so
	138	// if we improve the apt method communication stuff later
	139	// it will be better.
	140	if (strncmp(buffer, GNUPGBADSIG, sizeof(GNUPGBADSIG)-1) == 0)
	141	{
46e39c8e MV	142	if (Debug == true)
46e39c8e MV	143	std::clog << "Got BADSIG! " << std::endl;
b3d44315 MV	144	BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
	145	}
	146
	147	if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)
	148	{
46e39c8e MV	149	if (Debug == true)
46e39c8e MV	150	std::clog << "Got NO_PUBKEY " << std::endl;
b3d44315 MV	151	NoPubKeySigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
b3d44315 MV	152	}
2abb68b7 MV	153	if (strncmp(buffer, GNUPGNODATA, sizeof(GNUPGBADSIG)-1) == 0)
2abb68b7 MV	154	{
46e39c8e MV	155	if (Debug == true)
46e39c8e MV	156	std::clog << "Got NODATA! " << std::endl;
2abb68b7 MV	157	BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
2abb68b7 MV	158	}
c5d8878d MV	159	if (strncmp(buffer, GNUPGKEYEXPIRED, sizeof(GNUPGKEYEXPIRED)-1) == 0)
c5d8878d MV	160	{
46e39c8e MV	161	if (Debug == true)
46e39c8e MV	162	std::clog << "Got KEYEXPIRED! " << std::endl;
c5d8878d MV	163	WorthlessSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
	164	}
	165	if (strncmp(buffer, GNUPGREVKEYSIG, sizeof(GNUPGREVKEYSIG)-1) == 0)
	166	{
46e39c8e MV	167	if (Debug == true)
46e39c8e MV	168	std::clog << "Got REVKEYSIG! " << std::endl;
c5d8878d MV	169	WorthlessSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
	170	}
	171	if (strncmp(buffer, GNUPGGOODSIG, sizeof(GNUPGGOODSIG)-1) == 0)
b3d44315 MV	172	{
b3d44315 MV	173	char *sig = buffer + sizeof(GNUPGPREFIX);
c5d8878d	174	char *p = sig + sizeof("GOODSIG");
b3d44315 MV	175	while (p && isxdigit(p))
	176	p++;
	177	*p = 0;
46e39c8e MV	178	if (Debug == true)
46e39c8e MV	179	std::clog << "Got GOODSIG, key ID:" << sig << std::endl;
b3d44315 MV	180	GoodSigners.push_back(string(sig));
	181	}
	182	}
	183	fclose(pipein);
	184
	185	waitpid(pid, &status, 0);
46e39c8e	186	if (Debug == true)
b3d44315	187	{
46e39c8e	188	std::clog << "gpgv exited\n";
b3d44315 MV	189	}
	190
	191	if (WEXITSTATUS(status) == 0)
	192	{
	193	if (GoodSigners.empty())
339690e4	194	return _("Internal error: Good signature, but could not determine key fingerprint?!");
da9ed163	195	return "";
b3d44315 MV	196	}
	197	else if (WEXITSTATUS(status) == 1)
	198	{
339690e4	199	return _("At least one invalid signature was encountered.");
b3d44315 MV	200	}
	201	else if (WEXITSTATUS(status) == 111)
	202	{
f83589b5	203	ioprintf(ret, _("Could not execute '%s' to verify signature (is gpgv installed?)"), gpgvpath.c_str());
da9ed163	204	return ret.str();
b3d44315 MV	205	}
	206	else
	207	{
339690e4	208	return _("Unknown error executing gpgv");
b3d44315 MV	209	}
	210	}
	211
	212	bool GPGVMethod::Fetch(FetchItem *Itm)
	213	{
	214	URI Get = Itm->Uri;
	215	string Path = Get.Host + Get.Path; // To account for relative paths
	216	string keyID;
	217	vector<string> GoodSigners;
	218	vector<string> BadSigners;
c5d8878d MV	219	// a worthless signature is a expired or revoked one
c5d8878d MV	220	vector<string> WorthlessSigners;
b3d44315 MV	221	vector<string> NoPubKeySigners;
	222
	223	FetchResult Res;
	224	Res.Filename = Itm->DestFile;
	225	URIStart(Res);
	226
	227	// Run gpgv on file, extract contents and get the key ID of the signer
da9ed163	228	string msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(),
c5d8878d MV	229	GoodSigners, BadSigners, WorthlessSigners,
c5d8878d MV	230	NoPubKeySigners);
b3d44315 MV	231	if (GoodSigners.empty() \|\| !BadSigners.empty() \|\| !NoPubKeySigners.empty())
	232	{
	233	string errmsg;
	234	// In this case, something bad probably happened, so we just go
	235	// with what the other method gave us for an error message.
c5d8878d	236	if (BadSigners.empty() && WorthlessSigners.empty() && NoPubKeySigners.empty())
b3d44315 MV	237	errmsg = msg;
	238	else
	239	{
	240	if (!BadSigners.empty())
	241	{
339690e4	242	errmsg += _("The following signatures were invalid:\n");
b3d44315 MV	243	for (vector<string>::iterator I = BadSigners.begin();
	244	I != BadSigners.end(); I++)
	245	errmsg += (*I + "\n");
	246	}
c5d8878d MV	247	if (!WorthlessSigners.empty())
	248	{
	249	errmsg += _("The following signatures were invalid:\n");
	250	for (vector<string>::iterator I = WorthlessSigners.begin();
	251	I != WorthlessSigners.end(); I++)
	252	errmsg += (*I + "\n");
	253	}
b3d44315 MV	254	if (!NoPubKeySigners.empty())
b3d44315 MV	255	{
339690e4	256	errmsg += _("The following signatures couldn't be verified because the public key is not available:\n");
b3d44315 MV	257	for (vector<string>::iterator I = NoPubKeySigners.begin();
	258	I != NoPubKeySigners.end(); I++)
	259	errmsg += (*I + "\n");
	260	}
	261	}
ce424cd4 MV	262	// this is only fatal if we have no good sigs or if we have at
	263	// least one bad signature. good signatures and NoPubKey signatures
	264	// happen easily when a file is signed with multiple signatures
	265	if(GoodSigners.empty() or !BadSigners.empty())
f23153d0	266	return _error->Error("%s", errmsg.c_str());
b3d44315 MV	267	}
b3d44315 MV	268
b3d44315 MV	269	// Just pass the raw output up, because passing it as a real data
	270	// structure is too difficult with the method stuff. We keep it
	271	// as three separate vectors for future extensibility.
	272	Res.GPGVOutput = GoodSigners;
	273	Res.GPGVOutput.insert(Res.GPGVOutput.end(),BadSigners.begin(),BadSigners.end());
	274	Res.GPGVOutput.insert(Res.GPGVOutput.end(),NoPubKeySigners.begin(),NoPubKeySigners.end());
	275	URIDone(Res);
	276
	277	if (_config->FindB("Debug::Acquire::gpgv", false))
	278	{
46e39c8e	279	std::clog << "gpgv succeeded\n";
b3d44315 MV	280	}
	281
	282	return true;
	283	}
	284
	285
	286	int main()
	287	{
339690e4 MV	288	setlocale(LC_ALL, "");
339690e4 MV	289
b3d44315 MV	290	GPGVMethod Mth;
	291
	292	return Mth.Run();
	293	}