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Diffstat (limited to 'kioslave/sftp/ksshprocess.cpp')
| -rw-r--r-- | kioslave/sftp/ksshprocess.cpp | 1104 |
1 files changed, 1104 insertions, 0 deletions
diff --git a/kioslave/sftp/ksshprocess.cpp b/kioslave/sftp/ksshprocess.cpp new file mode 100644 index 000000000..c0393445d --- /dev/null +++ b/kioslave/sftp/ksshprocess.cpp @@ -0,0 +1,1104 @@ +/*************************************************************************** + ksshprocess.cpp - description + ------------------- + begin : Tue Jul 31 2001 + copyright : (C) 2001 by Lucas Fisher + email : ljfisher@purdue.edu + ***************************************************************************/ + +/*************************************************************************** + * * + * This program 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. * + * * + ***************************************************************************/ + +/* + * See the KSshProcess header for examples on use. + * + * This class uses a hacked version of the PTYProcess + * class. This was needed because the kdelibs PTYProcess does not provide + * access to the pty file descriptor which we need, because ssh prints the + * password prompt to the pty and reads the password from the pty. I don't + * feel I know enough about ptys to confidently modify the orignial + * PTYProcess class. + * + * To start ssh we take the arguments the user gave us + * in the SshOptList and build the ssh command arguments based on the version + * of ssh we are using. This command and its arguments are passed to + * PTYProcess for execution. Once ssh is started we scan each line of input + * from stdin, stderr, and the pty for recognizable strings. The recognizable + * strings are taken from several string tables. Each table contains a string + * for each specific version of ssh we support and a string for a generic + * version of OpenSSH and commercial SSH incase we don't recognized the + * specific ssh version strings (as when a new SSH version is released after + * a release of KSshProcess). There are tables for ssh version strings, + * password prompts, new host key errors, different host key errors, + * messages than indicate a successful connect, authentication errors, etc. + * If we find user interaction is necessary, for instance to provide a + * password or passphrase, we return a err code to the user who can send + * a message to KSshProcess, using one of several methods, to correct + * the error. + * + * Determining when the ssh connection has successfully authenticationed has + * proved to be the most difficult challenge. OpenSSH does not print a message + * on successful authentication, thus the only way to know is to send data + * and wait for a return. The problem here is sometimes it can take a bit + * to establish the connection (for example, do to DNS lookups). This means + * the user may be sitting there waiting for a connection that failed. + * Instead, ssh is always started with the verbose flag. Then we look for + * a message that indicates auth succeeded. This is hazardous because + * debug messages are more likely to change between OpenSSH releases. + * Thus, we could become incompatible with new OpenSSH releases. + */ + +#include <config.h> + +#include "ksshprocess.h" + +#include <stdio.h> +#include <errno.h> + +#ifdef HAVE_SYS_TIME_H +#include <sys/time.h> +#endif + +#include <kstandarddirs.h> +#include <klocale.h> +#include <qregexp.h> + +/* + * The following are tables of string and regexps we match + * against the output of ssh. An entry in each array + * corresponds the the version of ssh found in versionStrs[]. + * + * The version strings must be ordered in the array from most + * specific to least specific in cases where the beginning + * of several version strings are the similar. For example, + * consider the openssh version strings. The generic "OpenSSH" + * must be the last of the openssh version strings in the array + * so that is matched last. We use these generic version strings + * so we can do a best effor to support unknown ssh versions. + */ +QRegExp KSshProcess::versionStrs[] = { + QRegExp("OpenSSH_3\\.[6-9]|OpenSSH_[1-9]*[4-9]\\.[0-9]"), + QRegExp("OpenSSH"), + QRegExp("SSH Secure Shell") +}; + +const char * const KSshProcess::passwordPrompt[] = { + "password:", // OpenSSH + "password:", // OpenSSH + "password:" // SSH +}; + +const char * const KSshProcess::passphrasePrompt[] = { + "Enter passphrase for key", + "Enter passphrase for key", + "Passphrase for key" +}; + +const char * const KSshProcess::authSuccessMsg[] = { + "Authentication succeeded", + "ssh-userauth2 successful", + "Received SSH_CROSS_AUTHENTICATED packet" +}; + +const char* const KSshProcess::authFailedMsg[] = { + "Permission denied (", + "Permission denied (", + "Authentication failed." +}; + +const char* const KSshProcess::tryAgainMsg[] = { + "please try again", + "please try again", + "adjfhjsdhfdsjfsjdfhuefeufeuefe" +}; + +QRegExp KSshProcess::hostKeyMissingMsg[] = { + QRegExp("The authenticity of host|No (DSA|RSA) host key is known for"), + QRegExp("The authenticity of host|No (DSA|RSA) host key is known for"), + QRegExp("Host key not found from database") +}; + +const char* const KSshProcess::continuePrompt[] = { + "Are you sure you want to continue connecting (yes/no)?", + "Are you sure you want to continue connecting (yes/no)?", + "Are you sure you want to continue connecting (yes/no)?" +}; + +const char* const KSshProcess::hostKeyChangedMsg[] = { + "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!", + "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!", + "WARNING: HOST IDENTIFICATION HAS CHANGED!" +}; + +QRegExp KSshProcess::keyFingerprintMsg[] = { + QRegExp("..(:..){15}"), + QRegExp("..(:..){15}"), + QRegExp(".....(-.....){10}") +}; + +QRegExp KSshProcess::knownHostsFileMsg[] = { + QRegExp("Add correct host key in (.*) to get rid of this message."), + QRegExp("Add correct host key in (.*) to get rid of this message."), + QRegExp("Add correct host key to \"(.*)\"") +}; + + +// This prompt only applies to commerical ssh. +const char* const KSshProcess::changeHostKeyOnDiskPrompt[] = { + "as;jf;sajkfdslkfjas;dfjdsa;fj;dsajfdsajf", + "as;jf;sajkfdslkfjas;dfjdsa;fj;dsajfdsajf", + "Do you want to change the host key on disk (yes/no)?" +}; + +// We need this in addition the authFailedMsg because when +// OpenSSH gets a changed host key it will fail to connect +// depending on the StrictHostKeyChecking option. Depending +// how this option is set, it will print "Permission denied" +// and quit, or print "Host key verification failed." and +// quit. The later if StrictHostKeyChecking is "no". +// The former if StrictHostKeyChecking is +// "yes" or explicitly set to "ask". +QRegExp KSshProcess::hostKeyVerifyFailedMsg[] = { + QRegExp("Host key verification failed\\."), + QRegExp("Host key verification failed\\."), + QRegExp("Disconnected; key exchange or algorithm? negotiation failed \\(Key exchange failed\\.\\)\\.") +}; + +const char * const KSshProcess::connectionClosedMsg[] = { + "Connection closed by remote host", + "Connection closed by remote host", + "Connection closed by remote host" +}; + + +void KSshProcess::SIGCHLD_handler(int) { + while(waitpid(-1, NULL, WNOHANG) > 0); +} + +void KSshProcess::installSignalHandlers() { + struct sigaction act; + memset(&act,0,sizeof(act)); + act.sa_handler = SIGCHLD_handler; + act.sa_flags = 0 +#ifdef SA_NOCLDSTOP + | SA_NOCLDSTOP +#endif +#ifdef SA_RESTART + | SA_RESTART +#endif + ; + sigaction(SIGCHLD,&act,NULL); +} + +void KSshProcess::removeSignalHandlers() { + struct sigaction act; + memset(&act,0,sizeof(act)); + act.sa_handler = SIG_DFL; + sigaction(SIGCHLD,&act,NULL); +} + +KSshProcess::KSshProcess() + : mVersion(UNKNOWN_VER), mConnected(false), + mRunning(false), mConnectState(0) { + mSshPath = KStandardDirs::findExe(QString::fromLatin1("ssh")); + kdDebug(KSSHPROC) << "KSshProcess::KSshProcess(): ssh path [" << + mSshPath << "]" << endl; + + installSignalHandlers(); +} + +KSshProcess::KSshProcess(QString pathToSsh) + : mSshPath(pathToSsh), mVersion(UNKNOWN_VER), mConnected(false), + mRunning(false), mConnectState(0) { + installSignalHandlers(); +} + +KSshProcess::~KSshProcess(){ + disconnect(); + removeSignalHandlers(); + while(waitpid(-1, NULL, WNOHANG) > 0); +} + +bool KSshProcess::setSshPath(QString pathToSsh) { + mSshPath = pathToSsh; + version(); + if( mVersion == UNKNOWN_VER ) + return false; + + return true; +} + +KSshProcess::SshVersion KSshProcess::version() { + QString cmd; + cmd = mSshPath+" -V 2>&1"; + + // Get version string from ssh client. + FILE *p; + if( (p = popen(cmd.latin1(), "r")) == NULL ) { + kdDebug(KSSHPROC) << "KSshProcess::version(): " + "failed to start ssh: " << strerror(errno) << endl; + return UNKNOWN_VER; + } + + // Determine of the version from the version string. + size_t len; + char buf[128]; + if( (len = fread(buf, sizeof(char), sizeof(buf)-1, p)) == 0 ) { + kdDebug(KSSHPROC) << "KSshProcess::version(): " + "Read of ssh version string failed " << + strerror(ferror(p)) << endl; + return UNKNOWN_VER; + } + if( pclose(p) == -1 ) { + kdError(KSSHPROC) << "KSshProcess::version(): pclose failed." << endl; + } + buf[len] = '\0'; + QString ver; + ver = buf; + kdDebug(KSSHPROC) << "KSshProcess::version(): " + "got version string [" << ver << "]" << endl; + + mVersion = UNKNOWN_VER; + for(int i = 0; i < SSH_VER_MAX; i++) { + if( ver.find(versionStrs[i]) != -1 ) { + mVersion = (SshVersion)i; + break; + } + } + + kdDebug(KSSHPROC) << "KSshPRocess::version(): version number = " + << mVersion << endl; + + if( mVersion == UNKNOWN_VER ) { + kdDebug(KSSHPROC) << "KSshProcess::version(): " + "Sorry, I don't know about this version of ssh" << endl; + mError = ERR_UNKNOWN_VERSION; + return UNKNOWN_VER; + } + + return mVersion; +} +/* +QString KSshProcess::versionStr() { + if( mVersion == UNKNOWN_VER ) { + version(); + if( mVersion == UNKNOWN_VER ) + return QString::null; + } + + return QString::fromLatin1(versionStrs[mVersion]); +} +*/ + +bool KSshProcess::setOptions(const SshOptList& opts) { + kdDebug(KSSHPROC) << "KSshProcess::setOptions()" << endl; + mArgs.clear(); + SshOptListConstIterator it; + QString cmd, subsystem; + mPassword = mUsername = mHost = QString::null; + QCString tmp; + for(it = opts.begin(); it != opts.end(); ++it) { + //kdDebug(KSSHPROC) << "opt.opt = " << (*it).opt << endl; + //kdDebug(KSSHPROC) << "opt.str = " << (*it).str << endl; + //kdDebug(KSSHPROC) << "opt.num = " << (*it).num << endl; + switch( (*it).opt ) { + case SSH_VERBOSE: + mArgs.append("-v"); + break; + + case SSH_SUBSYSTEM: + subsystem = (*it).str; + break; + + case SSH_PORT: + mArgs.append("-p"); + tmp.setNum((*it).num); + mArgs.append(tmp); + mPort = (*it).num; + break; + + case SSH_HOST: + mHost = (*it).str; + break; + + case SSH_USERNAME: + mArgs.append("-l"); + mArgs.append((*it).str.latin1()); + mUsername = (*it).str; + break; + + case SSH_PASSWD: + mPassword = (*it).str; + break; + + case SSH_PROTOCOL: + if( mVersion <= OPENSSH ) { + tmp = "Protocol="; + tmp += QString::number((*it).num).latin1(); + mArgs.append("-o"); + mArgs.append(tmp); + } + else if( mVersion <= SSH ) { + if( (*it).num == 1 ) { + mArgs.append("-1"); + } + // else uses version 2 by default + } + break; + + case SSH_FORWARDX11: + tmp = "ForwardX11="; + tmp += (*it).boolean ? "yes" : "no"; + mArgs.append("-o"); + mArgs.append(tmp); + break; + + case SSH_FORWARDAGENT: + tmp = "ForwardAgent="; + tmp += (*it).boolean ? "yes" : "no"; + mArgs.append("-o"); + mArgs.append(tmp); + break; + + case SSH_ESCAPE_CHAR: + if( (*it).num == -1 ) + tmp = "none"; + else + tmp = (char)((*it).num); + mArgs.append("-e"); + mArgs.append(tmp); + break; + + case SSH_OPTION: + // don't allow NumberOfPasswordPrompts or StrictHostKeyChecking + // since KSshProcess depends on specific setting of these for + // preforming authentication correctly. + tmp = (*it).str.latin1(); + if( tmp.contains("NumberOfPasswordPrompts") || + tmp.contains("StrictHostKeyChecking") ) { + mError = ERR_INVALID_OPT; + return false; + } + else { + mArgs.append("-o"); + mArgs.append(tmp); + } + break; + + case SSH_COMMAND: + cmd = (*it).str; + break; + + default: + kdDebug(KSSHPROC) << "KSshProcess::setOptions(): " + "unrecognized ssh opt " << (*it).opt << endl; + } + } + + if( !subsystem.isEmpty() && !cmd.isEmpty() ) { + kdDebug(KSSHPROC) << "KSshProcess::setOptions(): " + "cannot use a subsystem and command at the same time" << endl; + mError = ERR_CMD_SUBSYS_CONFLICT; + mErrorMsg = i18n("Cannot specify a subsystem and command at the same time."); + return false; + } + + // These options govern the behavior of ssh and + // cannot be defined by the user + //mArgs.append("-o"); + //mArgs.append("StrictHostKeyChecking=ask"); + mArgs.append("-v"); // So we get a message that the + // connection was successful + if( mVersion <= OPENSSH ) { + // nothing + } + else if( mVersion <= SSH ) { + mArgs.append("-o"); // So we can check if the connection was successful + mArgs.append("AuthenticationSuccessMsg=yes"); + } + + if( mHost.isEmpty() ) { + kdDebug(KSSHPROC) << "KSshProcess::setOptions(): " + "a host name must be supplied" << endl; + return false; + } + else { + mArgs.append(mHost.latin1()); + } + + if( !subsystem.isEmpty() ) { + mArgs.append("-s"); + mArgs.append(subsystem.latin1()); + } + + if( !cmd.isEmpty() ) { + mArgs.append(cmd.latin1()); + } + + return true; +} + +void KSshProcess::printArgs() { + QValueListIterator<QCString> it; + for( it = mArgs.begin(); it != mArgs.end(); ++it) { + kdDebug(KSSHPROC) << "arg: " << *it << endl; + } +} + + +int KSshProcess::error(QString& msg) { + kdDebug(KSSHPROC) << "KSshProcess::error()" << endl; + kdDebug() << mErrorMsg << endl; + msg = mErrorMsg; + return mError; +} + +void KSshProcess::kill(int signal) { + int pid = ssh.pid(); + + kdDebug(KSSHPROC) << "KSshProcess::kill(signal:" << signal + << "): ssh pid is " << pid << endl; + kdDebug(KSSHPROC) << "KSshPRocess::kill(): we are " + << (mConnected ? "" : "not ") << "connected" << endl; + kdDebug(KSSHPROC) << "KSshProcess::kill(): we are " + << (mRunning ? "" : "not ") << "running a ssh process" << endl; + + if( mRunning && pid > 1 ) { + // Kill the child process... + if ( ::kill(pid, signal) == 0 ) { + // clean up if we tried to kill the process + if( signal == SIGTERM || signal == SIGKILL ) { + while(waitpid(-1, NULL, WNOHANG) > 0); + mConnected = false; + mRunning = false; + } + } + else + kdDebug(KSSHPROC) << "KSshProcess::kill(): kill failed" << endl; + } + else + kdDebug(KSSHPROC) << "KSshProcess::kill(): " + "Refusing to kill ssh process" << endl; +} + + + +/** + * Try to open an ssh connection. + * SSH prints certain messages to certain file descriptiors: + * passwordPrompt - pty + * passphrasePrompt - pty + * authSuccessMsg - stderr (OpenSSH), + * authFailedMsg - stderr + * hostKeyMissing - stderr + * hostKeyChanged - stderr + * continuePrompt - stderr + * + * We will use a select to wait for a line on each descriptor. Then get + * each line that available and take action based on it. The type + * of messages we are looking for and the action we take on each + * message are: + * passwordPrompt - Return false, set error to ERR_NEED_PASSWD. + * On the next call to connect() we expect a password + * to be available. + * + * passpharsePrompt - Return false, set error to ERR_NEED_PASSPHRASE. + * On the next call to connect() we expect a + * passphrase to be available. + * + * authSuccessMsg - Return true, as we have successfully established a + * ssh connection. + * + * authFailedMsg - Return false, set error to ERR_AUTH_FAILED. We + * were unable to authenticate the connection given + * the available authentication information. + * + * hostKeyMissing - Return false, set error to ERR_NEW_HOST_KEY. Caller + * must call KSshProcess.acceptHostKey(bool) to accept + * or reject the key before calling connect() again. + * + * hostKeyChanged - Return false, set error to ERR_DIFF_HOST_KEY. Caller + * must call KSshProcess.acceptHostKey(bool) to accept + * or reject the key before calling connect() again. + * + * continuePrompt - Send 'yes' or 'no' to accept or reject a key, + * respectively. + * + */ + + +void KSshProcess::acceptHostKey(bool accept) { + kdDebug(KSSHPROC) << "KSshProcess::acceptHostKey(accept:" + << accept << ")" << endl; + mAcceptHostKey = accept; +} + +void KSshProcess::setPassword(QString password) { + kdDebug(KSSHPROC) << "KSshProcess::setPassword(password:xxxxxxxx)" << endl; + mPassword = password; +} + +QString KSshProcess::getLine() { + static QStringList buffer; + QString line = QString::null; + QCString ptyLine, errLine; + + if( buffer.empty() ) { + // PtyProcess buffers lines. First check that there + // isn't something on the PtyProces buffer or that there + // is not data ready to be read from the pty or stderr. + ptyLine = ssh.readLineFromPty(false); + errLine = ssh.readLineFromStderr(false); + + // If PtyProcess did have something for us, get it and + // place it in our line buffer. + if( ! ptyLine.isEmpty() ) { + buffer.prepend(QString(ptyLine)); + } + + if( ! errLine.isEmpty() ) { + buffer.prepend(QString(errLine)); + } + + // If we still don't have anything in our buffer so there must + // not be anything on the pty or stderr. Setup a select() + // to wait for some data from SSH. + if( buffer.empty() ) { + //kdDebug(KSSHPROC) << "KSshProcess::getLine(): " << + // "Line buffer empty, calling select() to wait for data." << endl; + int errfd = ssh.stderrFd(); + int ptyfd = ssh.fd(); + fd_set rfds; + fd_set efds; + struct timeval tv; + + // find max file descriptor + int maxfd = ptyfd > errfd ? ptyfd : errfd; + + FD_ZERO(&rfds); + FD_SET(ptyfd, &rfds); // Add pty file descriptor + FD_SET(errfd, &rfds); // Add std error file descriptor + + FD_ZERO(&efds); + FD_SET(ptyfd, &efds); + FD_SET(errfd, &efds); + + tv.tv_sec = 60; tv.tv_usec = 0; // 60 second timeout + + // Wait for a message from ssh on stderr or the pty. + int ret = -1; + do + ret = ::select(maxfd+1, &rfds, NULL, &efds, &tv); + while( ret == -1 && errno == EINTR ); + + // Handle any errors from select + if( ret == 0 ) { + kdDebug(KSSHPROC) << "KSshProcess::connect(): " << + "timed out waiting for a response" << endl; + mError = ERR_TIMED_OUT; + return QString::null; + } + else if( ret == -1 ) { + kdDebug(KSSHPROC) << "KSshProcess::connect(): " + << "select error: " << strerror(errno) << endl; + mError = ERR_INTERNAL; + return QString::null; + } + + // We are not respecting any type of order in which the + // lines were received. Who knows whether pty or stderr + // had data on it first. + if( FD_ISSET(ptyfd, &rfds) ) { + ptyLine = ssh.readLineFromPty(false); + buffer.prepend(QString(ptyLine)); + //kdDebug(KSSHPROC) << "KSshProcess::getLine(): " + // "line from pty -" << ptyLine << endl; + } + + if( FD_ISSET(errfd, &rfds) ) { + errLine = ssh.readLineFromStderr(false); + buffer.prepend(QString(errLine)); + //kdDebug(KSSHPROC) << "KSshProcess::getLine(): " + // "line from err -" << errLine << endl; + } + + if( FD_ISSET(ptyfd, &efds) ) { + kdDebug(KSSHPROC) << "KSshProcess::getLine(): " + "Exception on pty file descriptor." << endl; + } + + if( FD_ISSET(errfd, &efds) ) { + kdDebug(KSSHPROC) << "KSshProcess::getLine(): " + "Exception on std err file descriptor." << endl; + } + + } + } + + // We should have something in our buffer now. + // Return the last line. + //it = buffer.end(); + //line = *it; + //buffer.remove(it); + + line = buffer.last(); + buffer.pop_back(); + + if( line.isNull() && buffer.count() > 0 ) { + line = buffer.last(); + buffer.pop_back(); + } + +// kdDebug(KSSHPROC) << "KSshProcess::getLine(): " << +// buffer.count() << " lines in buffer" << endl; + kdDebug(KSSHPROC) << "KSshProcess::getLine(): " + "ssh: " << line << endl; + + + return line; +} + +// All the different states we could go through while trying to connect. +enum sshConnectState { + STATE_START, STATE_TRY_PASSWD, STATE_WAIT_PROMPT, STATE_NEW_KEY_CONTINUE, + STATE_DIFF_KEY_CONTINUE, STATE_FATAL, STATE_WAIT_CONTINUE_PROMPT, + STATE_SEND_CONTINUE, STATE_AUTH_FAILED, STATE_NEW_KEY_WAIT_CONTINUE, + STATE_DIFF_KEY_WAIT_CONTINUE, STATE_TRY_PASSPHRASE +}; + +// Print the state as a string. Good for debugging +const char* stateStr(int state) { + switch(state) { + case STATE_START: + return "STATE_START"; + case STATE_TRY_PASSWD: + return "STATE_TRY_PASSWD"; + case STATE_WAIT_PROMPT: + return "STATE_WAIT_PROMPT"; + case STATE_NEW_KEY_CONTINUE: + return "STATE_NEW_KEY_CONTINUE"; + case STATE_DIFF_KEY_CONTINUE: + return "STATE_DIFF_KEY_CONTINUE"; + case STATE_FATAL: + return "STATE_FATAL"; + case STATE_WAIT_CONTINUE_PROMPT: + return "STATE_WAIT_CONTINUE_PROMPT"; + case STATE_SEND_CONTINUE: + return "STATE_SEND_CONTINE"; + case STATE_AUTH_FAILED: + return "STATE_AUTH_FAILED"; + case STATE_NEW_KEY_WAIT_CONTINUE: + return "STATE_NEW_KEY_WAIT_CONTINUE"; + case STATE_DIFF_KEY_WAIT_CONTINUE: + return "STATE_DIFF_KEY_WAIT_CONTINUE"; + case STATE_TRY_PASSPHRASE: + return "STATE_TRY_PASSPHRASE"; + } + return "UNKNOWN"; +} + +bool KSshProcess::connect() { + if( mVersion == UNKNOWN_VER ) { + // we don't know the ssh version yet, so find out + version(); + if( mVersion == -1 ) { + return false; + } + } + + // We'll put a limit on the number of state transitions + // to ensure we don't go out of control. + int transitionLimit = 500; + + while(--transitionLimit) { + kdDebug(KSSHPROC) << "KSshProcess::connect(): " + << "Connect state " << stateStr(mConnectState) << endl; + + QString line; // a line from ssh + QString msgBuf; // buffer for important messages from ssh + // which are to be returned to the user + + switch(mConnectState) { + // STATE_START: + // Executes the ssh binary with the options provided. If no options + // have been specified, sets error and returns false. Continue to + // state 1 if execution is successful, otherwise set error and + // return false. + case STATE_START: + // reset some key values to safe values + mAcceptHostKey = false; + mKeyFingerprint = QString::null; + mKnownHostsFile = QString::null; + + if( mArgs.isEmpty() ) { + kdDebug(KSSHPROC) << "KSshProcess::connect(): ssh options " + "need to be set first using setArgs()" << endl; + mError = ERR_NO_OPTIONS; + mErrorMsg = i18n("No options provided for ssh execution."); + return false; + } + + if( ssh.exec(mSshPath.latin1(), mArgs) ) { + kdDebug(KSSHPROC) << + "KSshProcess::connect(): ssh exec failed" << endl; + mError = ERR_CANNOT_LAUNCH; + mErrorMsg = i18n("Failed to execute ssh process."); + return false; + } + + kdDebug(KSSHPROC) << "KSshPRocess::connect(): ssh pid = " << ssh.pid() << endl; + + // set flag to indicate what have started a ssh process + mRunning = true; + mConnectState = STATE_WAIT_PROMPT; + break; + + // STATE_WAIT_PROMPT: + // Get a line of input from the ssh process. Check the contents + // of the line to determine the next state. Ignore the line + // if we don't recognize its contents. If the line contains + // the continue prompt, we have an error since we should never + // get that line in this state. Set ERR_INVALID_STATE error + // and return false. + case STATE_WAIT_PROMPT: + line = getLine(); + if( line.isNull() ) { + kdDebug(KSSHPROC) << "KSshProcess::connect(): " + "Got null line in STATE_WAIT_PROMPT." << endl; + mError = ERR_INTERACT; + mErrorMsg = + i18n("Error encountered while talking to ssh."); + mConnectState = STATE_FATAL; + } + else if( line.find(QString::fromLatin1(passwordPrompt[mVersion]), 0, false) != -1 ) { + mConnectState = STATE_TRY_PASSWD; + } + else if( line.find(passphrasePrompt[mVersion]) != -1 ) { + mConnectState = STATE_TRY_PASSPHRASE; + } + else if( line.find(authSuccessMsg[mVersion]) != -1 ) { + return true; + } + else if( line.find(authFailedMsg[mVersion]) != -1 + && line.find(tryAgainMsg[mVersion]) == -1 ) { + mConnectState = STATE_AUTH_FAILED; + } + else if( line.find(hostKeyMissingMsg[mVersion]) != -1 ) { + mConnectState = STATE_NEW_KEY_WAIT_CONTINUE; + } + else if( line.find(hostKeyChangedMsg[mVersion]) != -1 ) { + mConnectState = STATE_DIFF_KEY_WAIT_CONTINUE; + } + else if( line.find(continuePrompt[mVersion]) != -1 ) { + //mConnectState = STATE_SEND_CONTINUE; + kdDebug(KSSHPROC) << "KSshProcess:connect(): " + "Got continue prompt where we shouldn't (STATE_WAIT_PROMPT)" + << endl; + mError = ERR_INTERACT; + mErrorMsg = + i18n("Error encountered while talking to ssh."); + } + else if( line.find(connectionClosedMsg[mVersion]) != -1 ) { + mConnectState = STATE_FATAL; + mError = ERR_CLOSED_BY_REMOTE_HOST; + mErrorMsg = i18n("Connection closed by remote host."); + } + else if( line.find(changeHostKeyOnDiskPrompt[mVersion]) != -1 ) { + // always say yes to this. It always comes after commerical ssh + // prints a "continue to connect prompt". We assume that if the + // user choose to continue, then they also want to save the + // host key to disk. + ssh.writeLine("yes"); + } + else { + // ignore line + } + break; + + // STATE_TRY_PASSWD: + // If we have password send it to the ssh process, else + // set error ERR_NEED_PASSWD and return false to the caller. + // The caller then must then call KSshProcess::setPassword(QString) + // before calling KSshProcess::connect() again. + // + // Almost exactly liek STATE_TRY_PASSPHRASE. Check there if you + // make changes here. + case STATE_TRY_PASSWD: + // We have a password prompt waiting for us to supply + // a password. Send that password to ssh. If the caller + // did not supply a password like we asked, then ask + // again. + if( !mPassword.isEmpty() ) { +// ssh.WaitSlave(); + ssh.writeLine(mPassword.latin1()); + + // Overwrite the password so it isn't in memory. + mPassword.fill(QChar('X')); + + // Set the password to null so we will request another + // password if this one fails. + mPassword = QString::null; + + mConnectState = STATE_WAIT_PROMPT; + } + else { + kdDebug(KSSHPROC) << "KSshProcess::connect() " + "Need password from caller." << endl; + // The caller needs to supply a password before + // connecting can continue. + mError = ERR_NEED_PASSWD; + mErrorMsg = i18n("Please supply a password."); + mConnectState = STATE_TRY_PASSWD; + return false; + } + break; + + // STATE_TRY_KEY_PASSPHRASE: + // If we have passphrase send it to the ssh process, else + // set error ERR_NEED_PASSPHRASE and return false to the caller. + // The caller then must then call KSshProcess::setPassword(QString) + // before calling KSshProcess::connect() again. + // + // Almost exactly like STATE_TRY_PASSWD. The only difference is + // the error we set if we don't have a passphrase. We duplicate + // this code to keep in the spirit of the state machine. + case STATE_TRY_PASSPHRASE: + // We have a passphrase prompt waiting for us to supply + // a passphrase. Send that passphrase to ssh. If the caller + // did not supply a passphrase like we asked, then ask + // again. + if( !mPassword.isEmpty() ) { +// ssh.WaitSlave(); + ssh.writeLine(mPassword.latin1()); + + // Overwrite the password so it isn't in memory. + mPassword.fill(QChar('X')); + + // Set the password to null so we will request another + // password if this one fails. + mPassword = QString::null; + + mConnectState = STATE_WAIT_PROMPT; + } + else { + kdDebug(KSSHPROC) << "KSshProcess::connect() " + "Need passphrase from caller." << endl; + // The caller needs to supply a passphrase before + // connecting can continue. + mError = ERR_NEED_PASSPHRASE; + mErrorMsg = i18n("Please supply the passphrase for " + "your SSH private key."); + mConnectState = STATE_TRY_PASSPHRASE; + return false; + } + break; + + // STATE_AUTH_FAILED: + // Authentication has failed. Tell the caller by setting the + // ERR_AUTH_FAILED error and returning false. If + // auth has failed then ssh should have exited, but + // we will kill it to make sure. + case STATE_AUTH_FAILED: + mError = ERR_AUTH_FAILED; + mErrorMsg = i18n("Authentication to %1 failed").arg(mHost); + mConnectState = STATE_FATAL; + break; + + // STATE_NEW_KEY_WAIT_CONTINUE: + // Grab lines from ssh until we get a continue prompt or a auth + // denied. We will get the later if StrictHostKeyChecking is set + // to yes. Go to STATE_NEW_KEY_CONTINUE if we get a continue prompt. + case STATE_NEW_KEY_WAIT_CONTINUE: + line = getLine(); + if( line.isNull() ) { + kdDebug(KSSHPROC) << "KSshProcess::connect(): " + "Got null line in STATE_NEW_KEY_WAIT_CONTINUE." << endl; + mError = ERR_INTERACT; + mErrorMsg = + i18n("Error encountered while talking to ssh."); + mConnectState = STATE_FATAL; + } + else if( (line.find(authFailedMsg[mVersion]) != -1 + && line.find(tryAgainMsg[mVersion]) == -1) + || line.find(hostKeyVerifyFailedMsg[mVersion]) != -1 ) { + mError = ERR_AUTH_FAILED_NEW_KEY; + mErrorMsg = i18n( + "The identity of the remote host '%1' could not be verified " + "because the host's key is not in the \"known hosts\" file." + ).arg(mHost); + + if( mKnownHostsFile.isEmpty() ) { + mErrorMsg += i18n( + " Manually, add the host's key to the \"known hosts\" " + "file or contact your administrator." + ); + } + else { + mErrorMsg += i18n( + " Manually, add the host's key to %1 " + "or contact your administrator." + ).arg(mKnownHostsFile); + } + + mConnectState = STATE_FATAL; + } + else if( line.find(continuePrompt[mVersion]) != -1 ) { + mConnectState = STATE_NEW_KEY_CONTINUE; + } + else if( line.find(connectionClosedMsg[mVersion]) != -1 ) { + mConnectState = STATE_FATAL; + mError = ERR_CLOSED_BY_REMOTE_HOST; + mErrorMsg = i18n("Connection closed by remote host."); + } + else if( line.find(keyFingerprintMsg[mVersion]) != -1 ) { + mKeyFingerprint = keyFingerprintMsg[mVersion].cap(); + kdDebug(KSSHPROC) << "Found key fingerprint: " << mKeyFingerprint << endl; + mConnectState = STATE_NEW_KEY_WAIT_CONTINUE; + } + else { + // ignore line + } + break; + + + // STATE_NEW_KEY_CONTINUE: + // We got a continue prompt for the new key message. Set the error + // message to reflect this, return false and hope for caller response. + case STATE_NEW_KEY_CONTINUE: + mError = ERR_NEW_HOST_KEY; + mErrorMsg = i18n( + "The identity of the remote host '%1' could not be " + "verified. The host's key fingerprint is:\n%2\nYou should " + "verify the fingerprint with the host's administrator before " + "connecting.\n\n" + "Would you like to accept the host's key and connect anyway? " + ).arg(mHost).arg(mKeyFingerprint); + mConnectState = STATE_SEND_CONTINUE; + return false; + + // STATE_DIFF_KEY_WAIT_CONTINUE: + // Grab lines from ssh until we get a continue prompt or a auth + // denied. We will get the later if StrictHostKeyChecking is set + // to yes. Go to STATE_DIFF_KEY_CONTINUE if we get a continue prompt. + case STATE_DIFF_KEY_WAIT_CONTINUE: + line = getLine(); + if( line.isNull() ) { + kdDebug(KSSHPROC) << "KSshProcess::connect(): " + "Got null line in STATE_DIFF_KEY_WAIT_CONTINUE." << endl; + mError = ERR_INTERACT; + mErrorMsg = + i18n("Error encountered while talking to ssh."); + mConnectState = STATE_FATAL; + } + else if( (line.find(authFailedMsg[mVersion]) != -1 + && line.find(tryAgainMsg[mVersion]) == -1) + || line.find(hostKeyVerifyFailedMsg[mVersion]) != -1 ) { + mError = ERR_AUTH_FAILED_DIFF_KEY; + mErrorMsg = i18n( + "WARNING: The identity of the remote host '%1' has changed!\n\n" + "Someone could be eavesdropping on your connection, or the " + "administrator may have just changed the host's key. " + "Either way, you should verify the host's key fingerprint with the host's " + "administrator. The key fingerprint is:\n%2\n" + "Add the correct host key to \"%3\" to " + "get rid of this message." + ).arg(mHost).arg(mKeyFingerprint).arg(mKnownHostsFile); + mConnectState = STATE_FATAL; + } + else if( line.find(continuePrompt[mVersion]) != -1 ) { + mConnectState = STATE_DIFF_KEY_CONTINUE; + } + else if( line.find(keyFingerprintMsg[mVersion]) != -1 ) { + mKeyFingerprint = keyFingerprintMsg[mVersion].cap(); + kdDebug(KSSHPROC) << "Found key fingerprint: " << mKeyFingerprint << endl; + mConnectState = STATE_DIFF_KEY_WAIT_CONTINUE; + } + else if( line.find(knownHostsFileMsg[mVersion]) != -1 ) { + mKnownHostsFile = (knownHostsFileMsg[mVersion]).cap(1); + kdDebug(KSSHPROC) << "Found known hosts file name: " << mKnownHostsFile << endl; + mConnectState = STATE_DIFF_KEY_WAIT_CONTINUE; + } + else { + // ignore line + } + break; + + // STATE_DIFF_KEY_CONTINUE: + // We got a continue prompt for the different key message. + // Set ERR_DIFF_HOST_KEY error + // and return false to signal need to caller action. + case STATE_DIFF_KEY_CONTINUE: + mError = ERR_DIFF_HOST_KEY; + mErrorMsg = i18n( + "WARNING: The identity of the remote host '%1' has changed!\n\n" + "Someone could be eavesdropping on your connection, or the " + "administrator may have just changed the host's key. " + "Either way, you should verify the host's key fingerprint with the host's " + "administrator before connecting. The key fingerprint is:\n%2\n\n" + "Would you like to accept the host's new key and connect anyway?" + ).arg(mHost).arg(mKeyFingerprint); + mConnectState = STATE_SEND_CONTINUE; + return false; + + // STATE_SEND_CONTINUE: + // We found a continue prompt. Send our answer. + case STATE_SEND_CONTINUE: + if( mAcceptHostKey ) { + kdDebug(KSSHPROC) << "KSshProcess::connect(): " + "host key accepted" << endl; + ssh.writeLine("yes"); + mConnectState = STATE_WAIT_PROMPT; + } + else { + kdDebug(KSSHPROC) << "KSshProcess::connect(): " + "host key rejected" << endl; + ssh.writeLine("no"); + mError = ERR_HOST_KEY_REJECTED; + mErrorMsg = i18n("Host key was rejected."); + mConnectState = STATE_FATAL; + } + break; + + // STATE_FATAL: + // Something bad happened that we cannot recover from. + // Kill the ssh process and set flags to show we have + // ended the connection and killed ssh. + // + // mError and mErrorMsg should be set by the immediately + // previous state. + case STATE_FATAL: + kill(); + mConnected = false; + mRunning = false; + mConnectState = STATE_START; + // mError, mErroMsg set by last state + return false; + + default: + kdDebug(KSSHPROC) << "KSshProcess::connect(): " + "Invalid state number - " << mConnectState << endl; + mError = ERR_INVALID_STATE; + mConnectState = STATE_FATAL; + } + } + + // we should never get here + kdDebug(KSSHPROC) << "KSshProcess::connect(): " << + "After switch(). We shouldn't be here." << endl; + mError = ERR_INTERNAL; + return false; +} + +void KSshProcess::disconnect() { + kill(); + mConnected = false; + mRunning = false; + mConnectState = STATE_START; +} + |