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#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();
}