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Diffstat (limited to 'tdepasswd/passwd.cpp')
| -rw-r--r-- | tdepasswd/passwd.cpp | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/tdepasswd/passwd.cpp b/tdepasswd/passwd.cpp new file mode 100644 index 000000000..9d29333fc --- /dev/null +++ b/tdepasswd/passwd.cpp @@ -0,0 +1,284 @@ +/* vi: ts=8 sts=4 sw=4 + * + * $Id$ + * + * This file is part of the KDE project, module tdesu. + * Copyright (C) 1999,2000 Geert Jansen <[email protected]> + * + * passwd.cpp: Change a user's password. + */ + +#include <config.h> // setenv + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <ctype.h> +#include <pwd.h> +#include <signal.h> +#include <errno.h> +#include <fcntl.h> + +#include <sys/types.h> +#include <sys/stat.h> + +#include <tqcstring.h> + +#include <kdebug.h> +#include <kstandarddirs.h> + +#include <tdesu/process.h> +#include "passwd.h" + + +PasswdProcess::PasswdProcess(TQCString user) +{ + struct passwd *pw; + + if (user.isEmpty()) + { + pw = getpwuid(getuid()); + if (pw == 0L) + { + kdDebug(1512) << "You don't exist!\n"; + return; + } + m_User = pw->pw_name; + } else + { + pw = getpwnam(user); + if (pw == 0L) + { + kdDebug(1512) << k_lineinfo << "User " << user << "does not exist.\n"; + return; + } + m_User = user; + } + bOtherUser = (pw->pw_uid != getuid()); +} + + +PasswdProcess::~PasswdProcess() +{ +} + + +int PasswdProcess::checkCurrent(const char *oldpass) +{ + return exec(oldpass, 0L, 1); +} + + +int PasswdProcess::exec(const char *oldpass, const char *newpass, + int check) +{ + if (m_User.isEmpty()) + return -1; +// if (check) +// setTerminal(true); + + // Try to set the default locale to make the parsing of the output + // of `passwd' easier. + setenv("LANG","C", true /* override */); + + QCStringList args; + if(bOtherUser) + args += m_User; + int ret = PtyProcess::exec("passwd", args); + if (ret < 0) + { + kdDebug(1512) << k_lineinfo << "Passwd not found!\n"; + return PasswdNotFound; + } + + ret = ConversePasswd(oldpass, newpass, check); + if (ret < 0) + kdDebug(1512) << k_lineinfo << "Conversation with passwd failed. pid = " << pid() << endl; + + if ((waitForChild() != 0) && !check) + return PasswordNotGood; + + return ret; +} + + +/* + * The tricky thing is to make this work with a lot of different passwd + * implementations. We _don't_ want implementation specific routines. + * Return values: -1 = unknown error, 0 = ok, >0 = error code. + */ + +int PasswdProcess::ConversePasswd(const char *oldpass, const char *newpass, + int check) +{ + TQCString line, errline; + int state = 0; + + while (state != 7) + { + line = readLine(); + if (line.isNull()) + { + return -1; + } + + if (state == 0 && isPrompt(line, "new")) + // If root is changing a user's password, + // passwd can't prompt for the original password. + // Therefore, we have to start at state=2. + state=2; + + switch (state) + { + case 0: + // Eat garbage, wait for prompt + m_Error += line+"\n"; + if (isPrompt(line, "password")) + { + WaitSlave(); + write(m_Fd, oldpass, strlen(oldpass)); + write(m_Fd, "\n", 1); + state++; + break; + } + if (m_bTerminal) + fputs(line, stdout); + break; + + case 1: case 3: case 6: + // Wait for \n + if (line.isEmpty()) + { + state++; + break; + } + // error + return -1; + + case 2: + m_Error = ""; + if( line.contains("again")) + { + m_Error = line; + kill(m_Pid, SIGKILL); + waitForChild(); + return PasswordIncorrect; + } + // Wait for second prompt. + errline = line; // use first line for error message + while (!isPrompt(line, "new")) + { + line = readLine(); + if (line.isNull()) + { + // We didn't get the new prompt so assume incorrect password. + if (m_bTerminal) + fputs(errline, stdout); + m_Error = errline; + return PasswordIncorrect; + } + } + + // we have the new prompt + if (check) + { + kill(m_Pid, SIGKILL); + waitForChild(); + return 0; + } + WaitSlave(); + write(m_Fd, newpass, strlen(newpass)); + write(m_Fd, "\n", 1); + state++; + break; + + case 4: + // Wait for third prompt + if (isPrompt(line, "re")) + { + WaitSlave(); + write(m_Fd, newpass, strlen(newpass)); + write(m_Fd, "\n", 1); + state += 2; + break; + } + // Warning or error about the new password + if (m_bTerminal) + fputs(line, stdout); + m_Error = line + "\n"; + state++; + break; + + case 5: + // Wait for either a "Reenter password" or a "Enter password" prompt + if (isPrompt(line, "re")) + { + WaitSlave(); + write(m_Fd, newpass, strlen(newpass)); + write(m_Fd, "\n", 1); + state++; + break; + } + else if (isPrompt(line, "password")) + { + kill(m_Pid, SIGKILL); + waitForChild(); + return PasswordNotGood; + } + if (m_bTerminal) + fputs(line, stdout); + m_Error += line + "\n"; + break; + } + } + + // Are we ok or do we still get an error thrown at us? + m_Error = ""; + state = 0; + while (state != 1) + { + line = readLine(); + if (line.isNull()) + { + // No more input... OK + return 0; + } + if (isPrompt(line, "password")) + { + // Uh oh, another prompt. Not good! + kill(m_Pid, SIGKILL); + waitForChild(); + return PasswordNotGood; + } + m_Error += line + "\n"; // Collect error message + } + + kdDebug(1512) << k_lineinfo << "Conversation ended successfully.\n"; + return 0; +} + + +bool PasswdProcess::isPrompt(TQCString line, const char *word) +{ + unsigned i, j, colon; + unsigned int lineLength(line.length()); + for (i=0,j=0,colon=0; i<lineLength; i++) + { + if (line[i] == ':') + { + j = i; colon++; + continue; + } + if (!isspace(line[i])) + j++; + } + + if ((colon != 1) || (line[j] != ':')) + return false; + if (word == 0L) + return true; + return line.contains(word, false); +} + + |