[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;

   int fd[2];

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

   pid_t pid = fork();
   if (pid < 0)
      return string("Couldn't spawn new process") + strerror(errno);
   else if (pid == 0)
   {
      _error->PushToStack();
      bool const success = SigVerify::RunGPGV(outfile, file, 3, fd);
      if (success == false)
      {
	 string errmsg;
	 _error->PopMessage(errmsg);
	 _error->RevertToStack();
	 return errmsg;
      }
      _error->RevertToStack();
      exit(111);
   }
   close(fd[1]);

   FILE *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);

   int status;
   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 'gpgv' to verify signature (is gpgv installed?)"));
      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	58	int fd[2];
46e39c8e	59
b3d44315	60	if (pipe(fd) < 0)
b3d44315	61	return "Couldn't create pipe";
b3d44315	62
cf440fac	63	pid_t pid = fork();
b3d44315	64	if (pid < 0)
da9ed163	65	return string("Couldn't spawn new process") + strerror(errno);
b3d44315 MV	66	else if (pid == 0)
b3d44315 MV	67	{
89c4c588 MV	68	_error->PushToStack();
	69	bool const success = SigVerify::RunGPGV(outfile, file, 3, fd);
	70	if (success == false)
b3d44315	71	{
89c4c588 MV	72	string errmsg;
	73	_error->PopMessage(errmsg);
	74	_error->RevertToStack();
	75	return errmsg;
b3d44315	76	}
89c4c588	77	_error->RevertToStack();
b3d44315 MV	78	exit(111);
	79	}
	80	close(fd[1]);
	81
cf440fac DK	82	FILE *pipein = fdopen(fd[0], "r");
cf440fac DK	83
b3d44315 MV	84	// Loop over the output of gpgv, and check the signatures.
	85	size_t buffersize = 64;
	86	char buffer = (char ) malloc(buffersize);
	87	size_t bufferoff = 0;
	88	while (1)
	89	{
	90	int c;
	91
	92	// Read a line. Sigh.
	93	while ((c = getc(pipein)) != EOF && c != '\n')
	94	{
	95	if (bufferoff == buffersize)
	96	buffer = (char ) realloc(buffer, buffersize = 2);
	97	*(buffer+bufferoff) = c;
	98	bufferoff++;
	99	}
	100	if (bufferoff == 0 && c == EOF)
	101	break;
	102	*(buffer+bufferoff) = '\0';
	103	bufferoff = 0;
46e39c8e MV	104	if (Debug == true)
46e39c8e MV	105	std::clog << "Read: " << buffer << std::endl;
b3d44315 MV	106
	107	// Push the data into three separate vectors, which
	108	// we later concatenate. They're kept separate so
	109	// if we improve the apt method communication stuff later
	110	// it will be better.
	111	if (strncmp(buffer, GNUPGBADSIG, sizeof(GNUPGBADSIG)-1) == 0)
	112	{
46e39c8e MV	113	if (Debug == true)
46e39c8e MV	114	std::clog << "Got BADSIG! " << std::endl;
b3d44315 MV	115	BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
	116	}
	117
	118	if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)
	119	{
46e39c8e MV	120	if (Debug == true)
46e39c8e MV	121	std::clog << "Got NO_PUBKEY " << std::endl;
b3d44315 MV	122	NoPubKeySigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
b3d44315 MV	123	}
2abb68b7 MV	124	if (strncmp(buffer, GNUPGNODATA, sizeof(GNUPGBADSIG)-1) == 0)
2abb68b7 MV	125	{
46e39c8e MV	126	if (Debug == true)
46e39c8e MV	127	std::clog << "Got NODATA! " << std::endl;
2abb68b7 MV	128	BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
2abb68b7 MV	129	}
c5d8878d MV	130	if (strncmp(buffer, GNUPGKEYEXPIRED, sizeof(GNUPGKEYEXPIRED)-1) == 0)
c5d8878d MV	131	{
46e39c8e MV	132	if (Debug == true)
46e39c8e MV	133	std::clog << "Got KEYEXPIRED! " << std::endl;
c5d8878d MV	134	WorthlessSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
	135	}
	136	if (strncmp(buffer, GNUPGREVKEYSIG, sizeof(GNUPGREVKEYSIG)-1) == 0)
	137	{
46e39c8e MV	138	if (Debug == true)
46e39c8e MV	139	std::clog << "Got REVKEYSIG! " << std::endl;
c5d8878d MV	140	WorthlessSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
	141	}
	142	if (strncmp(buffer, GNUPGGOODSIG, sizeof(GNUPGGOODSIG)-1) == 0)
b3d44315 MV	143	{
b3d44315 MV	144	char *sig = buffer + sizeof(GNUPGPREFIX);
c5d8878d	145	char *p = sig + sizeof("GOODSIG");
b3d44315 MV	146	while (p && isxdigit(p))
	147	p++;
	148	*p = 0;
46e39c8e MV	149	if (Debug == true)
46e39c8e MV	150	std::clog << "Got GOODSIG, key ID:" << sig << std::endl;
b3d44315 MV	151	GoodSigners.push_back(string(sig));
	152	}
	153	}
	154	fclose(pipein);
	155
cf440fac	156	int status;
b3d44315	157	waitpid(pid, &status, 0);
46e39c8e	158	if (Debug == true)
b3d44315	159	{
46e39c8e	160	std::clog << "gpgv exited\n";
b3d44315 MV	161	}
	162
	163	if (WEXITSTATUS(status) == 0)
	164	{
	165	if (GoodSigners.empty())
339690e4	166	return _("Internal error: Good signature, but could not determine key fingerprint?!");
da9ed163	167	return "";
b3d44315 MV	168	}
	169	else if (WEXITSTATUS(status) == 1)
	170	{
339690e4	171	return _("At least one invalid signature was encountered.");
b3d44315 MV	172	}
	173	else if (WEXITSTATUS(status) == 111)
	174	{
cf440fac	175	ioprintf(ret, _("Could not execute 'gpgv' to verify signature (is gpgv installed?)"));
da9ed163	176	return ret.str();
b3d44315 MV	177	}
	178	else
	179	{
339690e4	180	return _("Unknown error executing gpgv");
b3d44315 MV	181	}
	182	}
	183
	184	bool GPGVMethod::Fetch(FetchItem *Itm)
	185	{
	186	URI Get = Itm->Uri;
	187	string Path = Get.Host + Get.Path; // To account for relative paths
	188	string keyID;
	189	vector<string> GoodSigners;
	190	vector<string> BadSigners;
c5d8878d MV	191	// a worthless signature is a expired or revoked one
c5d8878d MV	192	vector<string> WorthlessSigners;
b3d44315 MV	193	vector<string> NoPubKeySigners;
	194
	195	FetchResult Res;
	196	Res.Filename = Itm->DestFile;
	197	URIStart(Res);
	198
	199	// Run gpgv on file, extract contents and get the key ID of the signer
da9ed163	200	string msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(),
c5d8878d MV	201	GoodSigners, BadSigners, WorthlessSigners,
c5d8878d MV	202	NoPubKeySigners);
b3d44315 MV	203	if (GoodSigners.empty() \|\| !BadSigners.empty() \|\| !NoPubKeySigners.empty())
	204	{
	205	string errmsg;
	206	// In this case, something bad probably happened, so we just go
	207	// with what the other method gave us for an error message.
c5d8878d	208	if (BadSigners.empty() && WorthlessSigners.empty() && NoPubKeySigners.empty())
b3d44315 MV	209	errmsg = msg;
	210	else
	211	{
	212	if (!BadSigners.empty())
	213	{
339690e4	214	errmsg += _("The following signatures were invalid:\n");
b3d44315 MV	215	for (vector<string>::iterator I = BadSigners.begin();
	216	I != BadSigners.end(); I++)
	217	errmsg += (*I + "\n");
	218	}
c5d8878d MV	219	if (!WorthlessSigners.empty())
	220	{
	221	errmsg += _("The following signatures were invalid:\n");
	222	for (vector<string>::iterator I = WorthlessSigners.begin();
	223	I != WorthlessSigners.end(); I++)
	224	errmsg += (*I + "\n");
	225	}
b3d44315 MV	226	if (!NoPubKeySigners.empty())
b3d44315 MV	227	{
339690e4	228	errmsg += _("The following signatures couldn't be verified because the public key is not available:\n");
b3d44315 MV	229	for (vector<string>::iterator I = NoPubKeySigners.begin();
	230	I != NoPubKeySigners.end(); I++)
	231	errmsg += (*I + "\n");
	232	}
	233	}
ce424cd4 MV	234	// this is only fatal if we have no good sigs or if we have at
	235	// least one bad signature. good signatures and NoPubKey signatures
	236	// happen easily when a file is signed with multiple signatures
	237	if(GoodSigners.empty() or !BadSigners.empty())
f23153d0	238	return _error->Error("%s", errmsg.c_str());
b3d44315 MV	239	}
b3d44315 MV	240
b3d44315 MV	241	// Just pass the raw output up, because passing it as a real data
	242	// structure is too difficult with the method stuff. We keep it
	243	// as three separate vectors for future extensibility.
	244	Res.GPGVOutput = GoodSigners;
	245	Res.GPGVOutput.insert(Res.GPGVOutput.end(),BadSigners.begin(),BadSigners.end());
	246	Res.GPGVOutput.insert(Res.GPGVOutput.end(),NoPubKeySigners.begin(),NoPubKeySigners.end());
	247	URIDone(Res);
	248
	249	if (_config->FindB("Debug::Acquire::gpgv", false))
	250	{
46e39c8e	251	std::clog << "gpgv succeeded\n";
b3d44315 MV	252	}
	253
	254	return true;
	255	}
	256
	257
	258	int main()
	259	{
339690e4 MV	260	setlocale(LC_ALL, "");
339690e4 MV	261
b3d44315 MV	262	GPGVMethod Mth;
	263
	264	return Mth.Run();
	265	}