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