source4/heimdal/lib/hcrypto/ui.c

   1 /*
   2  * Copyright (c) 1997 - 2000, 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <signal.h>
  40 #ifdef HAVE_TERMIOS_H
  41 #include <termios.h>
  42 #endif
  43 #include <roken.h>
  44
  45 #include <ui.h>
  46 #ifdef HAVE_CONIO_H
  47 #include <conio.h>
  48 #endif
  49
  50 static sig_atomic_t intr_flag;
  51
  52 static void
  53 intr(int sig)
  54 {
  55     intr_flag++;
  56 }
  57
  58 #ifdef HAVE_CONIO_H
  59
  60 /*
  61  * Windows does console slightly different then then unix case.
  62  */
  63
  64 static int
  65 read_string(const char *preprompt, const char *prompt,
  66             char *buf, size_t len, int echo)
  67 {
  68     int of = 0;
  69     int c;
  70     char *p;
  71     void (*oldsigintr)(int);
  72
  73     _cprintf("%s%s", preprompt, prompt);
  74
  75     oldsigintr = signal(SIGINT, intr);
  76
  77     p = buf;
  78     while(intr_flag == 0){
  79         c = ((echo)? _getche(): _getch());
  80         if(c == '\n' || c == '\r')
  81             break;
  82         if(of == 0)
  83             *p++ = c;
  84         of = (p == buf + len);
  85     }
  86     if(of)
  87         p--;
  88     *p = 0;
  89
  90     if(echo == 0){
  91         printf("\n");
  92     }
  93
  94     signal(SIGINT, oldsigintr);
  95
  96     if(intr_flag)
  97         return -2;
  98     if(of)
  99         return -1;
 100     return 0;
 101 }
 102
 103 #else /* !HAVE_CONIO_H */
 104
 105 #ifndef NSIG
 106 #define NSIG 47
 107 #endif
 108
 109 static int
 110 read_string(const char *preprompt, const char *prompt,
 111             char *buf, size_t len, int echo)
 112 {
 113     struct sigaction sigs[NSIG];
 114     int oksigs[NSIG];
 115     struct sigaction sa;
 116     FILE *tty;
 117     int ret = 0;
 118     int of = 0;
 119     int i;
 120     int c;
 121     char *p;
 122
 123     struct termios t_new, t_old;
 124
 125     memset(&oksigs, 0, sizeof(oksigs));
 126
 127     memset(&sa, 0, sizeof(sa));
 128     sa.sa_handler = intr;
 129     sigemptyset(&sa.sa_mask);
 130     sa.sa_flags = 0;
 131     for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
 132         if (i != SIGALRM)
 133             if (sigaction(i, &sa, &sigs[i]) == 0)
 134                 oksigs[i] = 1;
 135
 136     if((tty = fopen("/dev/tty", "r")) != NULL)
 137         rk_cloexec_file(tty);
 138     else
 139         tty = stdin;
 140
 141     fprintf(stderr, "%s%s", preprompt, prompt);
 142     fflush(stderr);
 143
 144     if(echo == 0){
 145         tcgetattr(fileno(tty), &t_old);
 146         memcpy(&t_new, &t_old, sizeof(t_new));
 147         t_new.c_lflag &= ~ECHO;
 148         tcsetattr(fileno(tty), TCSANOW, &t_new);
 149     }
 150     intr_flag = 0;
 151     p = buf;
 152     while(intr_flag == 0){
 153         c = getc(tty);
 154         if(c == EOF){
 155             if(!ferror(tty))
 156                 ret = 1;
 157             break;
 158         }
 159         if(c == '\n')
 160             break;
 161         if(of == 0)
 162             *p++ = c;
 163         of = (p == buf + len);
 164     }
 165     if(of)
 166         p--;
 167     *p = 0;
 168
 169     if(echo == 0){
 170         fprintf(stderr, "\n");
 171         tcsetattr(fileno(tty), TCSANOW, &t_old);
 172     }
 173
 174     if(tty != stdin)
 175         fclose(tty);
 176
 177     for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
 178         if (oksigs[i])
 179             sigaction(i, &sigs[i], NULL);
 180
 181     if(ret)
 182         return -3;
 183     if(intr_flag)
 184         return -2;
 185     if(of)
 186         return -1;
 187     return 0;
 188 }
 189
 190 #endif /* HAVE_CONIO_H */
 191
 192 int
 193 UI_UTIL_read_pw_string(char *buf, int length, const char *prompt, int verify)
 194 {
 195     int ret;
 196
 197     ret = read_string("", prompt, buf, length, 0);
 198     if (ret)
 199         return ret;
 200
 201     if (verify) {
 202         char *buf2;
 203         buf2 = malloc(length);
 204         if (buf2 == NULL)
 205             return 1;
 206
 207         ret = read_string("Verify password - ", prompt, buf2, length, 0);
 208         if (ret) {
 209             free(buf2);
 210             return ret;
 211         }
 212         if (strcmp(buf2, buf) != 0)
 213             ret = 1;
 214         free(buf2);
 215     }
 216     return ret;
 217 }