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 #include <roken.h>
  36 #include <signal.h>
  37 #ifdef HAVE_TERMIOS_H
  38 #include <termios.h>
  39 #endif
  40
  41 #include <ui.h>
  42 #ifdef HAVE_CONIO_H
  43 #include <conio.h>
  44 #endif
  45
  46 static sig_atomic_t intr_flag;
  47
  48 static void
  49 intr(int sig)
  50 {
  51     intr_flag++;
  52 }
  53
  54 #ifdef HAVE_CONIO_H
  55
  56 /*
  57  * Windows does console slightly different then then unix case.
  58  */
  59
  60 static int
  61 read_string(const char *preprompt, const char *prompt,
  62             char *buf, size_t len, int echo)
  63 {
  64     int of = 0;
  65     int c;
  66     char *p;
  67     void (*oldsigintr)(int);
  68
  69     _cprintf("%s%s", preprompt, prompt);
  70
  71     oldsigintr = signal(SIGINT, intr);
  72
  73     p = buf;
  74     while(intr_flag == 0){
  75         c = ((echo)? _getche(): _getch());
  76         if(c == '\n' || c == '\r')
  77             break;
  78         if(of == 0)
  79             *p++ = c;
  80         of = (p == buf + len);
  81     }
  82     if(of)
  83         p--;
  84     *p = 0;
  85
  86     if(echo == 0){
  87         printf("\n");
  88     }
  89
  90     signal(SIGINT, oldsigintr);
  91
  92     if(intr_flag)
  93         return -2;
  94     if(of)
  95         return -1;
  96     return 0;
  97 }
  98
  99 #else /* !HAVE_CONIO_H */
 100
 101 #ifndef NSIG
 102 #define NSIG 47
 103 #endif
 104
 105 static int
 106 read_string(const char *preprompt, const char *prompt,
 107             char *buf, size_t len, int echo)
 108 {
 109     struct sigaction sigs[NSIG];
 110     int oksigs[NSIG];
 111     struct sigaction sa;
 112     FILE *tty;
 113     int ret = 0;
 114     int of = 0;
 115     int i;
 116     int c;
 117     char *p;
 118
 119     struct termios t_new, t_old;
 120
 121     memset(&oksigs, 0, sizeof(oksigs));
 122
 123     memset(&sa, 0, sizeof(sa));
 124     sa.sa_handler = intr;
 125     sigemptyset(&sa.sa_mask);
 126     sa.sa_flags = 0;
 127     for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
 128         if (i != SIGALRM)
 129             if (sigaction(i, &sa, &sigs[i]) == 0)
 130                 oksigs[i] = 1;
 131
 132     if((tty = fopen("/dev/tty", "r")) != NULL)
 133         rk_cloexec_file(tty);
 134     else
 135         tty = stdin;
 136
 137     fprintf(stderr, "%s%s", preprompt, prompt);
 138     fflush(stderr);
 139
 140     if(echo == 0){
 141         tcgetattr(fileno(tty), &t_old);
 142         memcpy(&t_new, &t_old, sizeof(t_new));
 143         t_new.c_lflag &= ~ECHO;
 144         tcsetattr(fileno(tty), TCSANOW, &t_new);
 145     }
 146     intr_flag = 0;
 147     p = buf;
 148     while(intr_flag == 0){
 149         c = getc(tty);
 150         if(c == EOF){
 151             if(!ferror(tty))
 152                 ret = 1;
 153             break;
 154         }
 155         if(c == '\n')
 156             break;
 157         if(of == 0)
 158             *p++ = c;
 159         of = (p == buf + len);
 160     }
 161     if(of)
 162         p--;
 163     *p = 0;
 164
 165     if(echo == 0){
 166         fprintf(stderr, "\n");
 167         tcsetattr(fileno(tty), TCSANOW, &t_old);
 168     }
 169
 170     if(tty != stdin)
 171         fclose(tty);
 172
 173     for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
 174         if (oksigs[i])
 175             sigaction(i, &sigs[i], NULL);
 176
 177     if(ret)
 178         return -3;
 179     if(intr_flag)
 180         return -2;
 181     if(of)
 182         return -1;
 183     return 0;
 184 }
 185
 186 #endif /* HAVE_CONIO_H */
 187
 188 int
 189 UI_UTIL_read_pw_string(char *buf, int length, const char *prompt, int verify)
 190 {
 191     int ret;
 192
 193     ret = read_string("", prompt, buf, length, 0);
 194     if (ret)
 195         return ret;
 196
 197     if (verify & UI_UTIL_FLAG_VERIFY) {
 198         char *buf2;
 199         buf2 = malloc(length);
 200         if (buf2 == NULL)
 201             return 1;
 202
 203         ret = read_string("Verify password - ", prompt, buf2, length, 0);
 204         if (ret) {
 205             free(buf2);
 206             return ret;
 207         }
 208         if (strcmp(buf2, buf) != 0) {
 209             if (!(verify & UI_UTIL_FLAG_VERIFY_SILENT)) {
 210                 fprintf(stderr, "Verify failure\n");
 211                 fflush(stderr);
 212             }
 213             ret = 1;
 214         }
 215         free(buf2);
 216     }
 217     return ret;
 218 }