[apt.git] / methods / gpgv.cc

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

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

#define GNUPGPREFIX "[GNUPG:]"
#define GNUPGBADSIG "[GNUPG:] BADSIG"
#define GNUPGNOPUBKEY "[GNUPG:] NO_PUBKEY"
#define GNUPGVALIDSIG "[GNUPG:] VALIDSIG"
#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> &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> &NoPubKeySigners)
{
   // setup a (empty) stringstream for formating the return value
   std::stringstream ret;
   ret.str("");

   if (_config->FindB("Debug::Acquire::gpgv", false))
   {
      std::cerr << "inside VerifyGetSigners" << std::endl;
   }
   pid_t pid;
   int fd[2];
   FILE *pipein;
   int status;
   struct stat buff;
   string gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv");
   string pubringpath = _config->Find("APT::GPGV::TrustedKeyring", "/etc/apt/trusted.gpg");
   if (_config->FindB("Debug::Acquire::gpgv", false))
   {
      std::cerr << "gpgv path: " << gpgvpath << std::endl;
      std::cerr << "Keyring path: " << pubringpath << std::endl;
   }

   if (stat(pubringpath.c_str(), &buff) != 0) 
   {
      ioprintf(ret, _("Couldn't access keyring: '%s'"), strerror(errno)); 
      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)
   {
      const char *Args[400];
      unsigned int i = 0;

      Args[i++] = gpgvpath.c_str();
      Args[i++] = "--status-fd";
      Args[i++] = "3";
      Args[i++] = "--keyring";
      Args[i++] = pubringpath.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[i++] = Opts->Value.c_str();
	    if(i >= 395) { 
	       std::cerr << _("E: Argument list from Acquire::gpgv::Options too long. Exiting.") << std::endl;
	       exit(111);
	    }
         }
      }
      Args[i++] = file;
      Args[i++] = outfile;
      Args[i++] = NULL;

      if (_config->FindB("Debug::Acquire::gpgv", false))
      {
         std::cerr << "Preparing to exec: " << gpgvpath;
	 for(unsigned int j=0;Args[j] != NULL; j++)
	    std::cerr << " " << Args[j];
	 std::cerr << std::endl;
      }
      int 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("LANG=");
      putenv("LC_ALL=");
      putenv("LC_MESSAGES=");
      execvp(gpgvpath.c_str(), (char **)Args);
             
      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 (_config->FindB("Debug::Acquire::gpgv", false))
         std::cerr << "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 (_config->FindB("Debug::Acquire::gpgv", false))
            std::cerr << "Got BADSIG! " << std::endl;
         BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
      }
      
      if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)
      {
         if (_config->FindB("Debug::Acquire::gpgv", false))
            std::cerr << "Got NO_PUBKEY " << std::endl;
         NoPubKeySigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
      }
      if (strncmp(buffer, GNUPGNODATA, sizeof(GNUPGBADSIG)-1) == 0)
      {
         if (_config->FindB("Debug::Acquire::gpgv", false))
            std::cerr << "Got NODATA! " << std::endl;
         BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
      }
      if (strncmp(buffer, GNUPGVALIDSIG, sizeof(GNUPGVALIDSIG)-1) == 0)
      {
         char *sig = buffer + sizeof(GNUPGPREFIX);
         char *p = sig + sizeof("VALIDSIG");
         while (*p && isxdigit(*p)) 
            p++;
         *p = 0;
         if (_config->FindB("Debug::Acquire::gpgv", false))
            std::cerr << "Got VALIDSIG, key ID:" << sig << std::endl;
         GoodSigners.push_back(string(sig));
      }
   }
   fclose(pipein);

   waitpid(pid, &status, 0);
   if (_config->FindB("Debug::Acquire::gpgv", false))
   {
      std::cerr << "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 gnupg 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;
   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, 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() && 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 (!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(errmsg.c_str());
   }
      
   // Transfer the modification times
   struct stat Buf;
   if (stat(Path.c_str(),&Buf) != 0)
      return _error->Errno("stat",_("Failed to stat %s"), Path.c_str());

   struct utimbuf TimeBuf;
   TimeBuf.actime = Buf.st_atime;
   TimeBuf.modtime = Buf.st_mtime;
   if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0)
      return _error->Errno("utime",_("Failed to set modification time"));

   if (stat(Itm->DestFile.c_str(),&Buf) != 0)
      return _error->Errno("stat",_("Failed to stat"));
   
   // Return a Done response
   Res.LastModified = Buf.st_mtime;
   Res.Size = Buf.st_size;
   // 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::cerr << "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>
339690e4	4	#include <apti18n.h>
b3d44315 MV	5
	6	#include <sys/stat.h>
	7	#include <unistd.h>
	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 MV	15
	16	#define GNUPGPREFIX "[GNUPG:]"
	17	#define GNUPGBADSIG "[GNUPG:] BADSIG"
	18	#define GNUPGNOPUBKEY "[GNUPG:] NO_PUBKEY"
	19	#define GNUPGVALIDSIG "[GNUPG:] VALIDSIG"
2abb68b7	20	#define GNUPGNODATA "[GNUPG:] NODATA"
b3d44315 MV	21
	22	class GPGVMethod : public pkgAcqMethod
	23	{
	24	private:
da9ed163	25	string VerifyGetSigners(const char file, const char outfile,
b3d44315 MV	26	vector<string> &GoodSigners, vector<string> &BadSigners,
	27	vector<string> &NoPubKeySigners);
	28
	29	protected:
	30	virtual bool Fetch(FetchItem *Itm);
	31
	32	public:
	33
	34	GPGVMethod() : pkgAcqMethod("1.0",SingleInstance \| SendConfig) {};
	35	};
	36
da9ed163	37	string GPGVMethod::VerifyGetSigners(const char file, const char outfile,
b3d44315 MV	38	vector<string> &GoodSigners,
	39	vector<string> &BadSigners,
	40	vector<string> &NoPubKeySigners)
	41	{
da9ed163 MV	42	// setup a (empty) stringstream for formating the return value
da9ed163 MV	43	std::stringstream ret;
b2c22075	44	ret.str("");
da9ed163	45
b3d44315 MV	46	if (_config->FindB("Debug::Acquire::gpgv", false))
	47	{
	48	std::cerr << "inside VerifyGetSigners" << std::endl;
	49	}
	50	pid_t pid;
	51	int fd[2];
	52	FILE *pipein;
	53	int status;
	54	struct stat buff;
	55	string gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv");
8a3642bd	56	string pubringpath = _config->Find("APT::GPGV::TrustedKeyring", "/etc/apt/trusted.gpg");
b3d44315 MV	57	if (_config->FindB("Debug::Acquire::gpgv", false))
	58	{
	59	std::cerr << "gpgv path: " << gpgvpath << std::endl;
	60	std::cerr << "Keyring path: " << pubringpath << std::endl;
	61	}
	62
da9ed163 MV	63	if (stat(pubringpath.c_str(), &buff) != 0)
	64	{
	65	ioprintf(ret, _("Couldn't access keyring: '%s'"), strerror(errno));
	66	return ret.str();
	67	}
b3d44315 MV	68	if (pipe(fd) < 0)
	69	{
	70	return "Couldn't create pipe";
	71	}
	72
	73	pid = fork();
	74	if (pid < 0)
	75	{
da9ed163	76	return string("Couldn't spawn new process") + strerror(errno);
b3d44315 MV	77	}
	78	else if (pid == 0)
	79	{
ad6a45d8 MV	80	const char *Args[400];
	81	unsigned int i = 0;
	82
	83	Args[i++] = gpgvpath.c_str();
	84	Args[i++] = "--status-fd";
	85	Args[i++] = "3";
	86	Args[i++] = "--keyring";
	87	Args[i++] = pubringpath.c_str();
	88
	89	Configuration::Item const *Opts;
	90	Opts = _config->Tree("Acquire::gpgv::Options");
	91	if (Opts != 0)
	92	{
	93	Opts = Opts->Child;
	94	for (; Opts != 0; Opts = Opts->Next)
	95	{
	96	if (Opts->Value.empty() == true)
	97	continue;
	98	Args[i++] = Opts->Value.c_str();
	99	if(i >= 395) {
339690e4	100	std::cerr << _("E: Argument list from Acquire::gpgv::Options too long. Exiting.") << std::endl;
ad6a45d8 MV	101	exit(111);
	102	}
	103	}
	104	}
	105	Args[i++] = file;
	106	Args[i++] = outfile;
	107	Args[i++] = NULL;
	108
b3d44315 MV	109	if (_config->FindB("Debug::Acquire::gpgv", false))
b3d44315 MV	110	{
ad6a45d8	111	std::cerr << "Preparing to exec: " << gpgvpath;
ec048f63	112	for(unsigned int j=0;Args[j] != NULL; j++)
af45f087	113	std::cerr << " " << Args[j];
ad6a45d8	114	std::cerr << std::endl;
b3d44315 MV	115	}
	116	int nullfd = open("/dev/null", O_RDONLY);
	117	close(fd[0]);
	118	// Redirect output to /dev/null; we read from the status fd
	119	dup2(nullfd, STDOUT_FILENO);
	120	dup2(nullfd, STDERR_FILENO);
	121	// Redirect the pipe to the status fd (3)
	122	dup2(fd[1], 3);
	123
	124	putenv("LANG=");
	125	putenv("LC_ALL=");
	126	putenv("LC_MESSAGES=");
ad6a45d8	127	execvp(gpgvpath.c_str(), (char **)Args);
b3d44315 MV	128
	129	exit(111);
	130	}
	131	close(fd[1]);
	132
	133	pipein = fdopen(fd[0], "r");
	134
	135	// Loop over the output of gpgv, and check the signatures.
	136	size_t buffersize = 64;
	137	char buffer = (char ) malloc(buffersize);
	138	size_t bufferoff = 0;
	139	while (1)
	140	{
	141	int c;
	142
	143	// Read a line. Sigh.
	144	while ((c = getc(pipein)) != EOF && c != '\n')
	145	{
	146	if (bufferoff == buffersize)
	147	buffer = (char ) realloc(buffer, buffersize = 2);
	148	*(buffer+bufferoff) = c;
	149	bufferoff++;
	150	}
	151	if (bufferoff == 0 && c == EOF)
	152	break;
	153	*(buffer+bufferoff) = '\0';
	154	bufferoff = 0;
	155	if (_config->FindB("Debug::Acquire::gpgv", false))
	156	std::cerr << "Read: " << buffer << std::endl;
	157
	158	// Push the data into three separate vectors, which
	159	// we later concatenate. They're kept separate so
	160	// if we improve the apt method communication stuff later
	161	// it will be better.
	162	if (strncmp(buffer, GNUPGBADSIG, sizeof(GNUPGBADSIG)-1) == 0)
	163	{
	164	if (_config->FindB("Debug::Acquire::gpgv", false))
	165	std::cerr << "Got BADSIG! " << std::endl;
	166	BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
	167	}
	168
	169	if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)
	170	{
	171	if (_config->FindB("Debug::Acquire::gpgv", false))
	172	std::cerr << "Got NO_PUBKEY " << std::endl;
	173	NoPubKeySigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
	174	}
2abb68b7 MV	175	if (strncmp(buffer, GNUPGNODATA, sizeof(GNUPGBADSIG)-1) == 0)
	176	{
	177	if (_config->FindB("Debug::Acquire::gpgv", false))
	178	std::cerr << "Got NODATA! " << std::endl;
	179	BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
	180	}
b3d44315 MV	181	if (strncmp(buffer, GNUPGVALIDSIG, sizeof(GNUPGVALIDSIG)-1) == 0)
	182	{
	183	char *sig = buffer + sizeof(GNUPGPREFIX);
	184	char *p = sig + sizeof("VALIDSIG");
	185	while (p && isxdigit(p))
	186	p++;
	187	*p = 0;
	188	if (_config->FindB("Debug::Acquire::gpgv", false))
	189	std::cerr << "Got VALIDSIG, key ID:" << sig << std::endl;
	190	GoodSigners.push_back(string(sig));
	191	}
	192	}
	193	fclose(pipein);
	194
	195	waitpid(pid, &status, 0);
	196	if (_config->FindB("Debug::Acquire::gpgv", false))
	197	{
339690e4	198	std::cerr << "gpgv exited\n";
b3d44315 MV	199	}
	200
	201	if (WEXITSTATUS(status) == 0)
	202	{
	203	if (GoodSigners.empty())
339690e4	204	return _("Internal error: Good signature, but could not determine key fingerprint?!");
da9ed163	205	return "";
b3d44315 MV	206	}
	207	else if (WEXITSTATUS(status) == 1)
	208	{
339690e4	209	return _("At least one invalid signature was encountered.");
b3d44315 MV	210	}
	211	else if (WEXITSTATUS(status) == 111)
	212	{
da9ed163 MV	213	ioprintf(ret, _("Could not execute '%s' to verify signature (is gnupg installed?)"), gpgvpath.c_str());
da9ed163 MV	214	return ret.str();
b3d44315 MV	215	}
	216	else
	217	{
339690e4	218	return _("Unknown error executing gpgv");
b3d44315 MV	219	}
	220	}
	221
	222	bool GPGVMethod::Fetch(FetchItem *Itm)
	223	{
	224	URI Get = Itm->Uri;
	225	string Path = Get.Host + Get.Path; // To account for relative paths
	226	string keyID;
	227	vector<string> GoodSigners;
	228	vector<string> BadSigners;
	229	vector<string> NoPubKeySigners;
	230
	231	FetchResult Res;
	232	Res.Filename = Itm->DestFile;
	233	URIStart(Res);
	234
	235	// Run gpgv on file, extract contents and get the key ID of the signer
da9ed163 MV	236	string msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(),
da9ed163 MV	237	GoodSigners, BadSigners, NoPubKeySigners);
b3d44315 MV	238	if (GoodSigners.empty() \|\| !BadSigners.empty() \|\| !NoPubKeySigners.empty())
	239	{
	240	string errmsg;
	241	// In this case, something bad probably happened, so we just go
	242	// with what the other method gave us for an error message.
	243	if (BadSigners.empty() && NoPubKeySigners.empty())
	244	errmsg = msg;
	245	else
	246	{
	247	if (!BadSigners.empty())
	248	{
339690e4	249	errmsg += _("The following signatures were invalid:\n");
b3d44315 MV	250	for (vector<string>::iterator I = BadSigners.begin();
	251	I != BadSigners.end(); I++)
	252	errmsg += (*I + "\n");
	253	}
	254	if (!NoPubKeySigners.empty())
	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())
	266	return _error->Error(errmsg.c_str());
b3d44315 MV	267	}
	268
	269	// Transfer the modification times
	270	struct stat Buf;
	271	if (stat(Path.c_str(),&Buf) != 0)
339690e4	272	return _error->Errno("stat",_("Failed to stat %s"), Path.c_str());
b3d44315 MV	273
	274	struct utimbuf TimeBuf;
	275	TimeBuf.actime = Buf.st_atime;
	276	TimeBuf.modtime = Buf.st_mtime;
	277	if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0)
339690e4	278	return _error->Errno("utime",_("Failed to set modification time"));
b3d44315 MV	279
b3d44315 MV	280	if (stat(Itm->DestFile.c_str(),&Buf) != 0)
339690e4	281	return _error->Errno("stat",_("Failed to stat"));
b3d44315 MV	282
	283	// Return a Done response
	284	Res.LastModified = Buf.st_mtime;
	285	Res.Size = Buf.st_size;
	286	// Just pass the raw output up, because passing it as a real data
	287	// structure is too difficult with the method stuff. We keep it
	288	// as three separate vectors for future extensibility.
	289	Res.GPGVOutput = GoodSigners;
	290	Res.GPGVOutput.insert(Res.GPGVOutput.end(),BadSigners.begin(),BadSigners.end());
	291	Res.GPGVOutput.insert(Res.GPGVOutput.end(),NoPubKeySigners.begin(),NoPubKeySigners.end());
	292	URIDone(Res);
	293
	294	if (_config->FindB("Debug::Acquire::gpgv", false))
	295	{
339690e4	296	std::cerr << "gpgv succeeded\n";
b3d44315 MV	297	}
	298
	299	return true;
	300	}
	301
	302
	303	int main()
	304	{
339690e4 MV	305	setlocale(LC_ALL, "");
339690e4 MV	306
b3d44315 MV	307	GPGVMethod Mth;
	308
	309	return Mth.Run();
	310	}