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tdepim/libkpgp/kpgpbase.cpp

687 lines
22 KiB

/*
kpgpbase.cpp
Copyright (C) 2001,2002 the KPGP authors
See file AUTHORS.kpgp for details
This file is part of KPGP, the KDE PGP/GnuPG support library.
KPGP is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <kdebug.h>
#include <config.h>
#include "kpgpbase.h"
#include "kpgp.h"
#include "kpgpblock.h"
#include <stdlib.h> /* setenv, unsetenv */
#include <unistd.h> /* pipe, close, fork, dup2, execl, _exit, write, read */
#include <sys/poll.h> /* poll, etc. */
#include <sys/types.h> /* pid_t */
#include <sys/wait.h> /* waitpid */
#include <errno.h>
#include <tqapplication.h>
namespace Kpgp {
Base::Base()
: input(), output(), error(), errMsg(), status(OK)
{
}
Base::~Base()
{
}
void
Base::clear()
{
input = TQCString();
output = TQCString();
error = TQCString();
errMsg = TQString();
status = OK;
}
int
Base::run( const char *cmd, const char *passphrase, bool onlyReadFromPGP )
{
/* the pipe ppass is used for to pass the password to
* pgp. passing the password together with the normal input through
* stdin doesn't seem to work as expected (at least for pgp5.0)
*/
char str[1025] = "\0";
int pin[2], pout[2], perr[2], ppass[2];
int len, len2;
FILE *pass;
pid_t child_pid;
int childExitqStatus;
struct pollfd pollin, pollout, pollerr;
int pollstatus;
if(passphrase)
{
pipe(ppass);
pass = fdopen(ppass[1], "w");
fwrite(passphrase, sizeof(char), strlen(passphrase), pass);
fwrite("\n", sizeof(char), 1, pass);
fclose(pass);
close(ppass[1]);
// tell pgp which fd to use for the passphrase
TQCString tmp;
tmp.sprintf("%d",ppass[0]);
::setenv("PGPPASSFD",tmp.data(),1);
//Uncomment these lines for testing only! Doing so will decrease security!
//kdDebug(5100) << "pgp PGPPASSFD = " << tmp << endl;
//kdDebug(5100) << "pgp pass = " << passphrase << endl;
}
else
::unsetenv("PGPPASSFD");
//Uncomment these lines for testing only! Doing so will decrease security!
kdDebug(5100) << "pgp cmd = " << cmd << endl;
//kdDebug(5100) << "pgp input = " << TQString(input)
// << "input length = " << input.length() << endl;
error = "";
output = "";
pipe(pin);
pipe(pout);
pipe(perr);
TQApplication::flushX();
if(!(child_pid = fork()))
{
/*We're the child.*/
close(pin[1]);
dup2(pin[0], 0);
close(pin[0]);
close(pout[0]);
dup2(pout[1], 1);
close(pout[1]);
close(perr[0]);
dup2(perr[1], 2);
close(perr[1]);
execl("/bin/sh", "sh", "-c", cmd, (void *)0);
_exit(127);
}
/*Only get here if we're the parent.*/
close(pin[0]);
close(pout[1]);
close(perr[1]);
// poll for "There is data to read."
pollout.fd = pout[0];
pollout.events = POLLIN;
pollout.revents = 0; // init with 0, just in case
pollerr.fd = perr[0];
pollerr.events = POLLIN;
pollerr.revents = 0; // init with 0, just in case
// poll for "Writing now will not block."
pollin.fd = pin[1];
pollin.events = POLLOUT;
pollin.revents = 0; // init with 0, just in case
if (!onlyReadFromPGP) {
if (!input.isEmpty()) {
// write to pin[1] one line after the other to prevent dead lock
uint input_length = input.length();
for (unsigned int i=0; i<input_length; i+=len2) {
len2 = 0;
// check if writing now to pin[1] will not block (5 ms timeout)
//kdDebug(5100) << "Polling pin[1]..." << endl;
pollstatus = poll(&pollin, 1, 5);
if (pollstatus == 1) {
//kdDebug(5100) << "Status for polling pin[1]: " << pollin.revents << endl;
if (pollin.revents & POLLERR) {
kdDebug(5100) << "PGP seems to have hung up" << endl;
break;
}
else if (pollin.revents & POLLOUT) {
// search end of next line
if ((len2 = input.find('\n', i)) == -1)
len2 = input_length - i;
else
len2 = len2 - i + 1;
//kdDebug(5100) << "Trying to write " << len2 << " bytes to pin[1] ..." << endl;
len2 = write(pin[1], input.data() + i, len2);
//kdDebug(5100) << "Wrote " << len2 << " bytes to pin[1] ..." << endl;
}
}
else if (!pollstatus) {
//kdDebug(5100) << "Timeout while polling pin[1]: "
// << pollin.revents << endl;
}
else if (pollstatus == -1) {
kdDebug(5100) << "Error while polling pin[1]: "
<< pollin.revents << endl;
}
if (pout[0] >= 0) {
do {
// check if there is data to read from pout[0]
//kdDebug(5100) << "Polling pout[0]..." << endl;
pollstatus = poll(&pollout, 1, 0);
if (pollstatus == 1) {
//kdDebug(5100) << "Status for polling pout[0]: " << pollout.revents << endl;
if (pollout.revents & POLLIN) {
//kdDebug(5100) << "Trying to read " << 1024 << " bytes from pout[0]" << endl;
if ((len = read(pout[0],str,1024))>0) {
//kdDebug(5100) << "Read " << len << " bytes from pout[0]" << endl;
str[len] ='\0';
output += str;
}
else
break;
}
}
else if (pollstatus == -1) {
kdDebug(5100) << "Error while polling pout[0]: "
<< pollout.revents << endl;
}
} while ((pollstatus == 1) && (pollout.revents & POLLIN));
}
if (perr[0] >= 0) {
do {
// check if there is data to read from perr[0]
//kdDebug(5100) << "Polling perr[0]..." << endl;
pollstatus = poll(&pollerr, 1, 0);
if (pollstatus == 1) {
//kdDebug(5100) << "Status for polling perr[0]: " << pollerr.revents << endl;
if (pollerr.revents & POLLIN) {
//kdDebug(5100) << "Trying to read " << 1024 << " bytes from perr[0]" << endl;
if ((len = read(perr[0],str,1024))>0) {
//kdDebug(5100) << "Read " << len << " bytes from perr[0]" << endl;
str[len] ='\0';
error += str;
}
else
break;
}
}
else if (pollstatus == -1) {
kdDebug(5100) << "Error while polling perr[0]: "
<< pollerr.revents << endl;
}
} while ((pollstatus == 1) && (pollerr.revents & POLLIN));
}
// abort writing to PGP if PGP hung up
if ((pollstatus == 1) &&
((pollout.revents & POLLHUP) || (pollerr.revents & POLLHUP))) {
kdDebug(5100) << "PGP hung up" << endl;
break;
}
}
}
else // if input.isEmpty()
write(pin[1], "\n", 1);
//kdDebug(5100) << "All input was written to pin[1]" << endl;
}
close(pin[1]);
pid_t waitpidRetVal;
do {
//kdDebug(5100) << "Checking if PGP is still running..." << endl;
childExitqStatus = 0;
waitpidRetVal = waitpid(child_pid, &childExitqStatus, WNOHANG);
//kdDebug(5100) << "waitpid returned " << waitpidRetVal << endl;
if (pout[0] >= 0) {
do {
// check if there is data to read from pout[0]
//kdDebug(5100) << "Polling pout[0]..." << endl;
pollstatus = poll(&pollout, 1, 0);
if (pollstatus == 1) {
//kdDebug(5100) << "Status for polling pout[0]: " << pollout.revents << endl;
if (pollout.revents & POLLIN) {
//kdDebug(5100) << "Trying to read " << 1024 << " bytes from pout[0]" << endl;
if ((len = read(pout[0],str,1024))>0) {
//kdDebug(5100) << "Read " << len << " bytes from pout[0]" << endl;
str[len] ='\0';
output += str;
} else {
/*
* Apparently, on NetBSD when the child dies, the pipe begins
* receiving empty data packets *before* waitpid() has signaled
* that the child has died. Also, notice that this happens
* without any error bit being set in pollfd.revents (is this a
* NetBSD bug??? ). Notice that these anomalous packets exist
* according to poll(), but have length 0 according to read().
* Thus, kde can remain stuck inside this loop.
*
* A solution to this problem is to get out of the inner loop
* when read() returns <=0. In this way, kde has another chance
* to call waitpid() to check if the child has died -- and this
* time the call should succeed.
*
* Setting POLLHUP in pollfd.revents is not necessary, but I just
* like the idea of signaling that something strange has
* happened.
*/
pollout.revents |= POLLHUP;
break;
}
}
}
else if (pollstatus == -1) {
kdDebug(5100) << "Error while polling pout[0]: "
<< pollout.revents << endl;
}
} while ((pollstatus == 1) && (pollout.revents & POLLIN));
}
if (perr[0] >= 0) {
do {
// check if there is data to read from perr[0]
//kdDebug(5100) << "Polling perr[0]..." << endl;
pollstatus = poll(&pollerr, 1, 0);
if (pollstatus == 1) {
//kdDebug(5100) << "Status for polling perr[0]: " << pollerr.revents << endl;
if (pollerr.revents & POLLIN) {
//kdDebug(5100) << "Trying to read " << 1024 << " bytes from perr[0]" << endl;
if ((len = read(perr[0],str,1024))>0) {
//kdDebug(5100) << "Read " << len << " bytes from perr[0]" << endl;
str[len] ='\0';
error += str;
} else {
/*
* Apparently, on NetBSD when the child dies, the pipe begins
* receiving empty data packets *before* waitpid() has signaled
* that the child has died. Also, notice that this happens
* without any error bit being set in pollfd.revents (is this a
* NetBSD bug??? ). Notice that these anomalous packets exist
* according to poll(), but have length 0 according to read().
* Thus, kde can remain stuck inside this loop.
*
* A solution to this problem is to get out of the inner loop
* when read() returns <=0. In this way, kde has another chance
* to call waitpid() to check if the child has died -- and this
* time the call should succeed.
*
* Setting POLLHUP in pollfd.revents is not necessary, but I just
* like the idea of signaling that something strange has
* happened.
*/
pollerr.revents |= POLLHUP;
break;
}
}
}
else if (pollstatus == -1) {
kdDebug(5100) << "Error while polling perr[0]: "
<< pollerr.revents << endl;
}
} while ((pollstatus == 1) && (pollerr.revents & POLLIN));
}
} while (waitpidRetVal == 0);
close(pout[0]);
close(perr[0]);
unsetenv("PGPPASSFD");
if(passphrase)
close(ppass[0]);
// Did the child exit normally?
if (WIFEXITED(childExitqStatus) != 0) {
// Get the return code of the child
childExitqStatus = WEXITSTATUS(childExitqStatus);
kdDebug(5100) << "PGP exited with exit status " << childExitqStatus
<< endl;
}
else {
childExitqStatus = -1;
kdDebug(5100) << "PGP exited abnormally!" << endl;
}
//Uncomment these lines for testing only! Doing so will decrease security!
//kdDebug(5100) << "pgp output = " << TQString(output) << endl;
//kdDebug(5100) << "pgp error = " << error << endl;
/* Make the information visible, so that a user can
* get to know what's going on during the pgp calls.
*/
kdDebug(5100) << error << endl;
return childExitqStatus;
}
int
Base::runGpg( const char *cmd, const char *passphrase, bool onlyReadFromGnuPG )
{
/* the pipe ppass is used for to pass the password to
* pgp. passing the password together with the normal input through
* stdin doesn't seem to work as expected (at least for pgp5.0)
*/
char str[1025] = "\0";
int pin[2], pout[2], perr[2], ppass[2];
int len, len2;
FILE *pass;
pid_t child_pid;
int childExitqStatus;
char gpgcmd[1024] = "\0";
struct pollfd poller[3];
int num_pollers = 0;
const int STD_OUT = 0;
const int STD_ERR = 1;
const int STD_IN = 2;
int pollstatus;
if(passphrase)
{
pipe(ppass);
pass = fdopen(ppass[1], "w");
fwrite(passphrase, sizeof(char), strlen(passphrase), pass);
fwrite("\n", sizeof(char), 1, pass);
fclose(pass);
close(ppass[1]);
//Uncomment these lines for testing only! Doing so will decrease security!
//kdDebug(5100) << "pass = " << passphrase << endl;
}
//Uncomment these lines for testing only! Doing so will decrease security!
//kdDebug(5100) << "pgp cmd = " << cmd << endl;
//kdDebug(5100) << "pgp input = " << TQString(input)
// << "input length = " << input.length() << endl;
error = "";
output = "";
pipe(pin);
pipe(pout);
pipe(perr);
if( passphrase ) {
if( mVersion >= "1.0.7" ) {
// GnuPG >= 1.0.7 supports the gpg-agent, so we look for it.
if( 0 == getenv("GPG_AGENT_INFO") ) {
// gpg-agent not found, so we tell gpg not to use the agent
snprintf( gpgcmd, 1023,
"LANGUAGE=C gpg --no-use-agent --passphrase-fd %d %s",
ppass[0], cmd );
}
else {
// gpg-agent seems to be running, so we tell gpg to use the agent
snprintf( gpgcmd, 1023,
"LANGUAGE=C gpg --use-agent %s",
cmd );
}
}
else {
// GnuPG < 1.0.7 doesn't know anything about the gpg-agent
snprintf( gpgcmd, 1023,
"LANGUAGE=C gpg --passphrase-fd %d %s",
ppass[0], cmd );
}
}
else {
snprintf(gpgcmd, 1023, "LANGUAGE=C gpg %s",cmd);
}
TQApplication::flushX();
if(!(child_pid = fork()))
{
/*We're the child.*/
close(pin[1]);
dup2(pin[0], 0);
close(pin[0]);
close(pout[0]);
dup2(pout[1], 1);
close(pout[1]);
close(perr[0]);
dup2(perr[1], 2);
close(perr[1]);
//#warning FIXME: there has to be a better way to do this
/* this is nasty nasty nasty (but it works) */
if( passphrase ) {
if( mVersion >= "1.0.7" ) {
// GnuPG >= 1.0.7 supports the gpg-agent, so we look for it.
if( 0 == getenv("GPG_AGENT_INFO") ) {
// gpg-agent not found, so we tell gpg not to use the agent
snprintf( gpgcmd, 1023,
"LANGUAGE=C gpg --no-use-agent --passphrase-fd %d %s",
ppass[0], cmd );
}
else {
// gpg-agent seems to be running, so we tell gpg to use the agent
snprintf( gpgcmd, 1023,
"LANGUAGE=C gpg --use-agent %s",
cmd );
}
}
else {
// GnuPG < 1.0.7 doesn't know anything about the gpg-agent
snprintf( gpgcmd, 1023,
"LANGUAGE=C gpg --passphrase-fd %d %s",
ppass[0], cmd );
}
}
else {
snprintf(gpgcmd, 1023, "LANGUAGE=C gpg %s",cmd);
}
kdDebug(5100) << "pgp cmd = " << gpgcmd << endl;
execl("/bin/sh", "sh", "-c", gpgcmd, (void *)0);
_exit(127);
}
// Only get here if we're the parent.
close(pin[0]);
close(pout[1]);
close(perr[1]);
// poll for "There is data to read."
poller[STD_OUT].fd = pout[0];
poller[STD_OUT].events = POLLIN;
poller[STD_ERR].fd = perr[0];
poller[STD_ERR].events = POLLIN;
num_pollers = 2;
if (!onlyReadFromGnuPG) {
// poll for "Writing now will not block."
poller[STD_IN].fd = pin[1];
poller[STD_IN].events = POLLOUT;
num_pollers = 3;
} else {
close (pin[1]);
pin[1] = -1;
}
pid_t waitpidRetVal;
unsigned int input_pos = 0;
uint input_length = input.length();
do {
//kdDebug(5100) << "Checking if GnuPG is still running..." << endl;
childExitqStatus = 0;
waitpidRetVal = waitpid(child_pid, &childExitqStatus, WNOHANG);
//kdDebug(5100) << "waitpid returned " << waitpidRetVal << endl;
do {
// poll the pipes
pollstatus = poll(poller, num_pollers, 10);
if( 0 < pollstatus ) {
// Check stdout.
if (poller[STD_OUT].revents & POLLIN) {
//kdDebug(5100) << "Trying to read " << 1024 << " bytes from pout[0]" << endl;
if ((len = read(pout[0],str,1024))>0) {
//kdDebug(5100) << "Read " << len << " bytes from pout[0]" << endl;
str[len] ='\0';
output += str;
}
else {
// FreeBSD/NetBSD workaround
//
// Apparently, on Free/NetBSD when the child dies, the pipe begins
// receiving empty data packets *before* waitpid() has signaled
// that the child has died. Also, notice that this happens
// without any error bit being set in pollfd.revents (is this a
// Free/NetBSD bug??? ). Notice that these anomalous packets exist
// according to poll(), but have length 0 according to read().
// Thus, we can remain stuck inside this loop.
//
// A solution to this problem is to get out of the inner loop
// when read() returns <=0. In this way, we have another chance
// to call waitpid() to check if the child has died -- and this
// time the call should succeed.
//
// Set POLLHUP in pollfd.revents to signal that something strange
// has happened and disable polling of stdout.
poller[STD_OUT].revents |= POLLHUP;
poller[STD_OUT].events = 0;
}
} else if (poller[STD_OUT].revents & POLLHUP) {
// disable polling of stdout
poller[STD_OUT].events = 0;
}
// Check stderr.
if (poller[STD_ERR].revents & POLLIN) {
//kdDebug(5100) << "Trying to read " << 1024 << " bytes from perr[0]" << endl;
if ((len = read(poller[STD_ERR].fd,str,1024))>0) {
//kdDebug(5100) << "Read " << len << " bytes from perr[0]" << endl;
str[len] ='\0';
error += str;
}
else {
// FreeBSD/NetBSD workaround (for details see above)
poller[STD_ERR].revents |= POLLHUP;
poller[STD_ERR].events = 0;
}
} else if (poller[STD_ERR].revents & POLLHUP) {
// disable polling of stderr
poller[STD_ERR].events = 0;
}
if (num_pollers > 2) {
if (poller[STD_IN].revents & ( POLLERR | POLLHUP ) ) {
kdDebug(5100) << "GnuPG seems to have hung up" << endl;
close (pin[1]);
pin[1] = -1;
--num_pollers;
}
else if (poller[STD_IN].revents & POLLOUT) {
if (!input.isEmpty()) {
// search end of next line
if ((len2 = input.find('\n', input_pos)) == -1)
len2 = input_length - input_pos;
else
len2 = len2 - input_pos + 1;
//kdDebug(5100) << "Trying to write " << len2 << " bytes to pin[1] ..." << endl;
len2 = write(pin[1], input.data() + input_pos, len2 );
//kdDebug(5100) << "Wrote " << len2 << " bytes to pin[1] ..." << endl;
input_pos += len2;
// We are done.
if (input_pos >= input_length) {
//kdDebug(5100) << "All input was written to pin[1]" << endl;
close (pin[1]);
pin[1] = -1;
--num_pollers;
}
}
else { // if input.isEmpty()
write(pin[1], "\n", 1);
//kdDebug(5100) << "All input was written to pin[1]" << endl;
close (pin[1]);
pin[1] = -1;
--num_pollers;
}
}
}
}
} while ( (pollstatus > 0) && ( (num_pollers > 2)
|| (poller[STD_OUT].events != 0)
|| (poller[STD_ERR].events != 0) ) );
if (pollstatus == -1) {
kdDebug(5100) << "GnuPG poll failed, errno: " << errno << endl;
}
} while(waitpidRetVal == 0);
if( 0 <= pin[1] )
close (pin[1]);
close(pout[0]);
close(perr[0]);
if(passphrase)
close(ppass[0]);
// Did the child exit normally?
if (WIFEXITED(childExitqStatus) != 0) {
// Get the return code of the child
childExitqStatus = WEXITSTATUS(childExitqStatus);
kdDebug(5100) << "GnuPG exited with exit status " << childExitqStatus
<< endl;
}
else {
childExitqStatus = -1;
kdDebug(5100) << "GnuPG exited abnormally!" << endl;
}
//Uncomment these lines for testing only! Doing so will decrease security!
//kdDebug(5100) << "gpg stdout:\n" << TQString(output) << endl;
// Make the information visible, so that a user can
// get to know what's going on during the gpg calls.
kdDebug(5100) << "gpg stderr:\n" << error << endl;
return childExitqStatus;
}
TQCString
Base::addUserId()
{
TQCString cmd;
TQCString pgpUser = Module::getKpgp()->user();
if(!pgpUser.isEmpty())
{
cmd += " -u 0x";
cmd += pgpUser;
return cmd;
}
return TQCString();
}
} // namespace Kpgp