crypto/dist/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 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 __RCSID("$Heimdal: ui.c 18158 2006-09-22 15:45:57Z lha $"
  37         "$NetBSD$");
  38 #endif
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <signal.h>
  44 #include <termios.h>
  45 #include <roken.h>
  46
  47 #include <ui.h>
  48
  49 static sig_atomic_t intr_flag;
  50
  51 static void
  52 intr(int sig)
  53 {
  54     intr_flag++;
  55 }
  56
  57 #ifndef NSIG
  58 #define NSIG 47
  59 #endif
  60
  61 static int
  62 read_string(const char *preprompt, const char *prompt,
  63             char *buf, size_t len, int echo)
  64 {
  65     struct sigaction sigs[NSIG];
  66     int oksigs[NSIG];
  67     struct sigaction sa;
  68     FILE *tty;
  69     int ret = 0;
  70     int of = 0;
  71     int i;
  72     int c;
  73     char *p;
  74
  75     struct termios t_new, t_old;
  76
  77     memset(&oksigs, 0, sizeof(oksigs));
  78
  79     memset(&sa, 0, sizeof(sa));
  80     sa.sa_handler = intr;
  81     sigemptyset(&sa.sa_mask);
  82     sa.sa_flags = 0;
  83     for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
  84         if (i != SIGALRM)
  85             if (sigaction(i, &sa, &sigs[i]) == 0)
  86                 oksigs[i] = 1;
  87
  88     if((tty = fopen("/dev/tty", "r")) == NULL)
  89         tty = stdin;
  90
  91     fprintf(stderr, "%s%s", preprompt, prompt);
  92     fflush(stderr);
  93
  94     if(echo == 0){
  95         tcgetattr(fileno(tty), &t_old);
  96         memcpy(&t_new, &t_old, sizeof(t_new));
  97         t_new.c_lflag &= ~ECHO;
  98         tcsetattr(fileno(tty), TCSANOW, &t_new);
  99     }
 100     intr_flag = 0;
 101     p = buf;
 102     while(intr_flag == 0){
 103         c = getc(tty);
 104         if(c == EOF){
 105             if(!ferror(tty))
 106                 ret = 1;
 107             break;
 108         }
 109         if(c == '\n')
 110             break;
 111         if(of == 0)
 112             *p++ = c;
 113         of = (p == buf + len);
 114     }
 115     if(of)
 116         p--;
 117     *p = 0;
 118
 119     if(echo == 0){
 120         printf("\n");
 121         tcsetattr(fileno(tty), TCSANOW, &t_old);
 122     }
 123
 124     if(tty != stdin)
 125         fclose(tty);
 126
 127     for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
 128         if (oksigs[i])
 129             sigaction(i, &sigs[i], NULL);
 130
 131     if(ret)
 132         return -3;
 133     if(intr_flag)
 134         return -2;
 135     if(of)
 136         return -1;
 137     return 0;
 138 }
 139
 140 int
 141 UI_UTIL_read_pw_string(char *buf, int length, const char *prompt, int verify)
 142 {
 143     int ret;
 144
 145     ret = read_string("", prompt, buf, length, 0);
 146     if (ret)
 147         return ret;
 148
 149     if (verify) {
 150         char *buf2;
 151         buf2 = malloc(length);
 152         if (buf2 == NULL)
 153             return 1;
 154
 155         ret = read_string("Verify password - ", prompt, buf2, length, 0);
 156         if (ret) {
 157             free(buf2);
 158             return ret;
 159         }
 160         if (strcmp(buf2, buf) != 0)
 161             ret = 1;
 162         free(buf2);
 163     }
 164     return ret;
 165 }