221 lines
7.6 KiB
C
221 lines
7.6 KiB
C
#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#if defined(__linux__)
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#include <linux/fs.h>
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#elif defined(__CYGWIN__)
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#include <cygwin/fs.h>
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#else
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#include <sys/disk.h>
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#endif
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#include <fcntl.h>
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#include <unistd.h>
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#include <math.h>
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#include <pwd.h>
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#include <uuid/uuid.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <alg/sha256.h>
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#include <crypto/crypto_scrypt.h>
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#include <prop/proplib.h>
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#define MP_N 32768
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#define MP_r 8
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#define MP_p 2
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#define MP_dkLen 64
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#define MP_hash PearlHashSHA256
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#define MP_env_username "MP_USERNAME"
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#define MP_env_sitetype "MP_SITETYPE"
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#define MP_env_sitecounter "MP_SITECOUNTER"
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char *homedir(const char *filename) {
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char *homedir = NULL;
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#if defined(__CYGWIN__)
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homedir = getenv("USERPROFILE");
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if (!homedir) {
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const char *homeDrive = getenv("HOMEDRIVE");
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const char *homePath = getenv("HOMEPATH");
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homedir = char[strlen(homeDrive) + strlen(homePath) + 1];
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sprintf(homedir, "%s/%s", homeDrive, homePath);
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}
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#else
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struct passwd* passwd = getpwuid(getuid());
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if (passwd)
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homedir = passwd->pw_dir;
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if (!homedir)
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homedir = getenv("HOME");
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#endif
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if (!homedir)
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homedir = getcwd(NULL, 0);
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char *homefile = NULL;
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asprintf(&homefile, "%s/%s", homedir, filename);
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return homefile;
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}
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int main(int argc, char *const argv[]) {
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// Read the environment.
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const char *userName = getenv( MP_env_username );
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const char *masterPassword = NULL;
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const char *siteName = NULL;
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const char *siteTypeString = getenv( MP_env_sitetype );
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uint32_t siteCounter = 1;
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const char *siteCounterString = getenv( MP_env_sitecounter );
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// Read the options.
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char opt;
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while ((opt = getopt(argc, argv, "u:t:c:")) != -1)
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switch (opt) {
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case 'u':
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userName = optarg;
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break;
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case 't':
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siteTypeString = optarg;
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break;
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case 'c':
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siteCounterString = optarg;
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break;
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case '?':
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switch (optopt) {
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case 'u':
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fprintf (stderr, "Missing user name to option: -%c\n", optopt);
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break;
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case 't':
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fprintf (stderr, "Missing type name to option: -%c\n", optopt);
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break;
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case 'c':
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fprintf (stderr, "Missing counter value to option: -%c\n", optopt);
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break;
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default:
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fprintf (stderr, "Unknown option: -%c\n", optopt);
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}
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return 1;
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default:
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abort();
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}
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if (optind < argc)
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siteName = argv[optind];
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// Convert and validate input.
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if (!userName) {
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fprintf (stderr, "Missing user name.\n");
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return 1;
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}
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if (!siteName) {
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fprintf (stderr, "Missing site name.\n");
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return 1;
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}
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if (siteCounterString)
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siteCounter = atoi( siteCounterString );
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if (siteCounter < 1) {
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fprintf (stderr, "Invalid site counter: %d\n", siteCounter);
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return 1;
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}
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// Read the master password.
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char *mpwConfigPath = homedir(".mpw");
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if (!mpwConfigPath) {
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fprintf (stderr, "Couldn't resolve path for configuration file: %d\n", errno);
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return 1;
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}
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FILE *mpwConfig = fopen(mpwConfigPath, "r");
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if (!mpwConfig) {
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fprintf (stderr, "Couldn't open configuration file: %s: %d\n", mpwConfigPath, errno);
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return 1;
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}
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free(mpwConfigPath);
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char *line = NULL;
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size_t linecap = 0;
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ssize_t linelen;
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while ((linelen = getline(&line, &linecap, mpwConfig)) > 0) {
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char *configUserName = strsep(&line, "\t: ");
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if (configUserName == userName) {
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while (line[0] && strlen(masterPassword = strsep(&line, "\t: ")) == 0);
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break;
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}
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}
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if (!masterPassword) {
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fprintf (stderr, "Missing master password for user: %s\n", userName);
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return 1;
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}
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// Calculate the master key.
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uint8_t *masterKey = malloc( MP_dkLen );
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if (!masterKey) {
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fprintf (stderr, "Could not allocate master key: %d\n", errno);
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return 1;
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}
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const uint32_t n_userNameLength = htonl(strlen(userName));
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char *masterKeySalt = NULL;
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size_t masterKeySaltLength = asprintf(&masterKeySalt, "com.lyndir.masterpassword%s%s", (const char *) &n_userNameLength, userName);
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if (!masterKeySalt) {
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fprintf (stderr, "Could not allocate master key salt: %d\n", errno);
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return 1;
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}
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if (crypto_scrypt( (const uint8_t *)masterPassword, strlen(masterPassword), (const uint8_t *)masterKeySalt, masterKeySaltLength, MP_N, MP_r, MP_p, masterKey, MP_dkLen ) < 0) {
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fprintf (stderr, "Could not generate master key: %d\n", errno);
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return 1;
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}
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memset(masterKeySalt, 0, masterKeySaltLength);
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free(masterKeySalt);
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// Calculate the site seed.
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const uint32_t n_siteCounter = htonl(siteCounter), n_siteNameLength = htonl(strlen(siteName));
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char *sitePasswordInfo = NULL;
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size_t sitePasswordInfoLength = asprintf(&sitePasswordInfo, "com.lyndir.masterpassword%s%s%s", (const char *) &n_siteNameLength, siteName, (const char *) &n_siteCounter);
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if (!sitePasswordInfo) {
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fprintf (stderr, "Could not allocate site seed: %d\n", errno);
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return 1;
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}
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uint8_t sitePasswordSeed[32];
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HMAC_SHA256_Buf(masterKey, MP_dkLen, sitePasswordInfo, sitePasswordInfoLength, sitePasswordSeed);
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memset(masterKey, 0, MP_dkLen);
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memset(sitePasswordInfo, 0, sitePasswordInfoLength);
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free(masterKey);
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free(sitePasswordInfo);
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// Determine the cipher.
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prop_dictionary_t MPTypes_ciphers = prop_dictionary_internalize_from_file("ciphers.plist");
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if (!MPTypes_ciphers) {
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fprintf (stderr, "Could not read cipher definitions: %d\n", errno);
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return 1;
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}
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prop_array_t typeCiphers = prop_dictionary_get(prop_dictionary_get(MPTypes_ciphers, "[self classNameOfType:type]"), "[self nameOfType:type]");
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if (!typeCiphers) {
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fprintf (stderr, "Could not find cipher definition for type: %s\n", siteTypeString);
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return 1;
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}
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prop_string_t cipher = prop_array_get(typeCiphers, sitePasswordSeed[0] % prop_array_count(typeCiphers));
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if (!typeCiphers) {
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fprintf (stderr, "Missing cipher definitions for type: %s\n", siteTypeString);
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return 1;
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}
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//trc(@"type %@, ciphers: %@, selected: %@", [self nameOfType:type], typeCiphers, cipher);
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// Encode the password from the seed using the cipher.
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//NSAssert([seed length] >= [cipher length] + 1, @"Insufficient seed bytes to encode cipher.");
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const prop_dictionary_t characterClasses = prop_dictionary_get(MPTypes_ciphers, "MPCharacterClasses");
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char *sitePassword = calloc(prop_string_size(cipher) + 1, sizeof(char));
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char cipherClass[2] = {0, 0};
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for (int c = 0; c < prop_string_size(cipher); ++c) {
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const uint16_t keyByte = sitePasswordSeed[c + 1];
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cipherClass[0] = prop_string_cstring_nocopy(cipher)[c];
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const prop_string_t cipherClassCharacters = prop_dictionary_get(characterClasses, cipherClass);
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const char character = prop_string_cstring_nocopy(cipherClassCharacters)[ keyByte % prop_string_size(cipherClassCharacters) ];
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//trc(@"class %@ has characters: %@, index: %u, selected: %@", cipherClass, cipherClassCharacters, keyByte, character);
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sitePassword[c] = character;
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}
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memset(sitePasswordSeed, 0, sizeof(sitePasswordSeed));
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// Output the password.
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fprintf( stdout, "%s\n", sitePassword );
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return 0;
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}
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