246 lines
7.5 KiB
C
246 lines
7.5 KiB
C
//==============================================================================
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// This file is part of Master Password.
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// Copyright (c) 2011-2017, Maarten Billemont.
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//
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// Master Password is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Master Password is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You can find a copy of the GNU General Public License in the
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// LICENSE file. Alternatively, see <http://www.gnu.org/licenses/>.
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//==============================================================================
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#include "mpw-cli-util.h"
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <pwd.h>
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#include <string.h>
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#include <errno.h>
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#include <sysexits.h>
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#include "mpw-util.h"
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/** Read the value of an environment variable.
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* @return A newly allocated string or NULL if the variable doesn't exist. */
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const char *mpw_getenv(const char *variableName) {
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char *envBuf = getenv( variableName );
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return envBuf? strdup( envBuf ): NULL;
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}
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/** Use the askpass program to prompt the user.
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* @return A newly allocated string or NULL if askpass is not supported or an error occurred. */
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char *mpw_askpass(const char *prompt) {
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const char *askpass = mpw_getenv( MP_ENV_askpass );
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if (!askpass)
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return NULL;
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int pipes[2];
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if (pipe( pipes ) == ERR) {
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wrn( "Couldn't pipe: %s\n", strerror( errno ) );
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return NULL;
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}
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pid_t pid = fork();
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if (pid == ERR) {
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wrn( "Couldn't fork for askpass:\n %s: %s\n", askpass, strerror( errno ) );
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return NULL;
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}
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if (!pid) {
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// askpass fork
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close( pipes[0] );
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if (dup2( pipes[1], STDOUT_FILENO ) == ERR)
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ftl( "Couldn't connect pipe to process: %s\n", strerror( errno ) );
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else if (execlp( askpass, askpass, prompt, NULL ) == ERR)
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ftl( "Couldn't execute askpass:\n %s: %s\n", askpass, strerror( errno ) );
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exit( EX_SOFTWARE );
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}
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close( pipes[1] );
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char *answer = mpw_read_fd( pipes[0] );
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close( pipes[0] );
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int status;
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if (waitpid( pid, &status, 0 ) == ERR) {
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wrn( "Couldn't wait for askpass: %s\n", strerror( errno ) );
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mpw_free_string( &answer );
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return NULL;
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}
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if (WIFEXITED( status ) && WEXITSTATUS( status ) == EXIT_SUCCESS && answer && strlen( answer )) {
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// Remove trailing newline.
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if (answer[strlen( answer ) - 1] == '\n')
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answer[strlen( answer ) - 1] = '\0';
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return answer;
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}
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mpw_free_string( &answer );
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return NULL;
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}
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/** Ask the user a question.
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* @return A newly allocated string or NULL if an error occurred trying to read from the user. */
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const char *mpw_getline(const char *prompt) {
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// Get answer from askpass.
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char *answer = mpw_askpass( prompt );
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if (answer)
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return answer;
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// Get password from terminal.
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fprintf( stderr, "%s ", prompt );
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size_t bufSize = 0;
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ssize_t lineSize = getline( &answer, &bufSize, stdin );
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if (lineSize <= 1) {
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mpw_free_string( &answer );
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return NULL;
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}
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// Remove trailing newline.
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answer[lineSize - 1] = '\0';
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return answer;
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}
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/** Ask the user for a password.
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* @return A newly allocated string or NULL if an error occurred trying to read from the user. */
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const char *mpw_getpass(const char *prompt) {
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// Get password from askpass.
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const char *password = mpw_askpass( prompt );
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if (password)
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return password;
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// Get password from terminal.
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char *answer = getpass( prompt );
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if (!answer)
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return NULL;
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password = strdup( answer );
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memset_s( answer, strlen( answer ), 0, strlen( answer ) );
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return password;
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}
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/** Get the absolute path to the mpw configuration file with the given prefix name and file extension.
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* Resolves the file <prefix.extension> as located in the <.mpw.d> directory inside the user's home directory
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* or current directory if it couldn't be resolved.
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* @return A newly allocated string. */
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const char *mpw_path(const char *prefix, const char *extension) {
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// Resolve user's home directory.
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char *homeDir = NULL;
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if (!homeDir)
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if ((homeDir = getenv( "HOME" )))
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homeDir = strdup( homeDir );
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if (!homeDir)
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if ((homeDir = getenv( "USERPROFILE" )))
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homeDir = strdup( homeDir );
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if (!homeDir) {
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const char *homeDrive = getenv( "HOMEDRIVE" ), *homePath = getenv( "HOMEPATH" );
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if (homeDrive && homePath)
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homeDir = strdup( mpw_str( "%s%s", homeDrive, homePath ) );
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}
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if (!homeDir) {
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struct passwd *passwd = getpwuid( getuid() );
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if (passwd)
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homeDir = strdup( passwd->pw_dir );
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}
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if (!homeDir)
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homeDir = getcwd( NULL, 0 );
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// Compose filename.
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char *path = strdup( mpw_str( "%s.%s", prefix, extension ) );
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// This is a filename, remove all potential directory separators.
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for (char *slash; (slash = strstr( path, "/" )); *slash = '_');
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// Compose pathname.
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if (homeDir) {
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const char *homePath = mpw_str( "%s/.mpw.d/%s", homeDir, path );
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free( homeDir );
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free( path );
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if (homePath)
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path = strdup( homePath );
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}
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return path;
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}
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/** mkdir all the directories up to the directory of the given file path.
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* @return true if the file's path exists. */
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bool mpw_mkdirs(const char *filePath) {
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if (!filePath)
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return false;
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// The path to mkdir is the filePath without the last path component.
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char *pathEnd = strrchr( filePath, '/' );
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char *path = pathEnd? strndup( filePath, (size_t)(pathEnd - filePath) ): NULL;
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if (!path)
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return false;
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// Save the cwd and for absolute paths, start at the root.
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char *cwd = getcwd( NULL, 0 );
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if (*filePath == '/')
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chdir( "/" );
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// Walk the path.
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bool success = true;
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for (char *dirName = strtok( path, "/" ); success && dirName; dirName = strtok( NULL, "/" )) {
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if (!strlen( dirName ))
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continue;
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success &= (mkdir( dirName, 0700 ) != ERR || errno == EEXIST) && chdir( dirName ) != ERR;
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}
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free( path );
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if (chdir( cwd ) == ERR)
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wrn( "Could not restore cwd:\n %s: %s\n", cwd, strerror( errno ) );
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free( cwd );
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return success;
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}
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/** Read until EOF from the given file descriptor.
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* @return A newly allocated string or NULL if the read buffer couldn't be allocated or an error occurred. */
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char *mpw_read_fd(int fd) {
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char *buf = NULL;
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size_t blockSize = 4096, bufSize = 0, bufOffset = 0;
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ssize_t readSize = 0;
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while ((mpw_realloc( &buf, &bufSize, blockSize )) &&
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((readSize = read( fd, buf + bufOffset, blockSize )) > 0));
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if (readSize == ERR)
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mpw_free( &buf, bufSize );
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return buf;
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}
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/** Read the file contents of a given file.
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* @return A newly allocated string or NULL if the read buffer couldn't be allocated. */
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char *mpw_read_file(FILE *file) {
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if (!file)
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return NULL;
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char *buf = NULL;
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size_t blockSize = 4096, bufSize = 0, bufOffset = 0, readSize = 0;
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while ((mpw_realloc( &buf, &bufSize, blockSize )) &&
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(bufOffset += (readSize = fread( buf + bufOffset, 1, blockSize, file ))) &&
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(readSize == blockSize));
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return buf;
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}
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