193787Sdes/* 294691Sdes * Copyright (c) 2000-2002 by Solar Designer. See LICENSE. 393787Sdes */ 493787Sdes 593787Sdes#include <stdio.h> 693787Sdes#include <string.h> 793787Sdes#include <unistd.h> 893787Sdes#include <errno.h> 993787Sdes#include <fcntl.h> 1093787Sdes 1193787Sdes#include "passwdqc.h" 1293787Sdes 1393787Sdes#define SEPARATORS "_,.;:-!&" 1493787Sdes 1593787Sdesstatic int read_loop(int fd, char *buffer, int count) 1693787Sdes{ 1793787Sdes int offset, block; 1893787Sdes 1993787Sdes offset = 0; 2093787Sdes while (count > 0) { 2193787Sdes block = read(fd, &buffer[offset], count); 2293787Sdes 2393787Sdes if (block < 0) { 2493787Sdes if (errno == EINTR) continue; 2593787Sdes return block; 2693787Sdes } 2793787Sdes if (!block) return offset; 2893787Sdes 2993787Sdes offset += block; 3093787Sdes count -= block; 3193787Sdes } 3293787Sdes 3393787Sdes return offset; 3493787Sdes} 3593787Sdes 3693787Sdeschar *_passwdqc_random(passwdqc_params_t *params) 3793787Sdes{ 3893787Sdes static char output[0x100]; 3993787Sdes int bits; 4094691Sdes int use_separators, count, i; 4194691Sdes unsigned int length; 4293787Sdes char *start, *end; 4393787Sdes int fd; 4493787Sdes unsigned char bytes[2]; 4593787Sdes 4693787Sdes if (!(bits = params->random_bits)) 4793787Sdes return NULL; 4893787Sdes 4993787Sdes count = 1 + ((bits - 12) + 14) / 15; 5093787Sdes use_separators = ((bits + 11) / 12 != count); 5193787Sdes 5293787Sdes length = count * 7 - 1; 5394691Sdes if (length >= sizeof(output) || (int)length > params->max) 5494691Sdes return NULL; 5593787Sdes 5693787Sdes if ((fd = open("/dev/urandom", O_RDONLY)) < 0) return NULL; 5793787Sdes 5893787Sdes length = 0; 5993787Sdes do { 6093787Sdes if (read_loop(fd, bytes, sizeof(bytes)) != sizeof(bytes)) { 6193787Sdes close(fd); 6293787Sdes return NULL; 6393787Sdes } 6493787Sdes 6594691Sdes i = (((int)bytes[1] & 0x0f) << 8) | (int)bytes[0]; 6694691Sdes start = _passwdqc_wordset_4k[i]; 6793787Sdes end = memchr(start, '\0', 6); 6893787Sdes if (!end) end = start + 6; 6993787Sdes if (length + (end - start) >= sizeof(output) - 1) { 7093787Sdes close(fd); 7193787Sdes return NULL; 7293787Sdes } 7393787Sdes memcpy(&output[length], start, end - start); 7493787Sdes length += end - start; 7593787Sdes bits -= 12; 7693787Sdes 7793787Sdes if (use_separators && bits > 3) { 7894691Sdes i = ((int)bytes[1] & 0x70) >> 4; 7994691Sdes output[length++] = SEPARATORS[i]; 8093787Sdes bits -= 3; 8193787Sdes } else 8293787Sdes if (bits > 0) 8393787Sdes output[length++] = ' '; 8493787Sdes } while (bits > 0); 8593787Sdes 8693787Sdes memset(bytes, 0, sizeof(bytes)); 8793787Sdes output[length] = '\0'; 8893787Sdes 8993787Sdes close(fd); 9093787Sdes 9193787Sdes return output; 9293787Sdes} 93