crypto/x509/x509_obj.c

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/objects.h>
  13 #include <openssl/x509.h>
  14 #include <openssl/buffer.h>
  15 #include "internal/x509_int.h"
  16
  17 /*
  18  * Limit to ensure we don't overflow: much greater than
  19  * anything encountered in practice.
  20  */
  21
  22 #define NAME_ONELINE_MAX    (1024 * 1024)
  23
  24 char *X509_NAME_oneline(const X509_NAME *a, char *buf, int len)
  25 {
  26     const X509_NAME_ENTRY *ne;
  27     int i;
  28     int n, lold, l, l1, l2, num, j, type;
  29     const char *s;
  30     char *p;
  31     unsigned char *q;
  32     BUF_MEM *b = NULL;
  33     static const char hex[17] = "0123456789ABCDEF";
  34     int gs_doit[4];
  35     char tmp_buf[80];
  36 #ifdef CHARSET_EBCDIC
  37     unsigned char ebcdic_buf[1024];
  38 #endif
  39
  40     if (buf == NULL) {
  41         if ((b = BUF_MEM_new()) == NULL)
  42             goto err;
  43         if (!BUF_MEM_grow(b, 200))
  44             goto err;
  45         b->data[0] = '\0';
  46         len = 200;
  47     } else if (len == 0) {
  48         return NULL;
  49     }
  50     if (a == NULL) {
  51         if (b) {
  52             buf = b->data;
  53             OPENSSL_free(b);
  54         }
  55         strncpy(buf, "NO X509_NAME", len);
  56         buf[len - 1] = '\0';
  57         return buf;
  58     }
  59
  60     len--;                      /* space for '\0' */
  61     l = 0;
  62     for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
  63         ne = sk_X509_NAME_ENTRY_value(a->entries, i);
  64         n = OBJ_obj2nid(ne->object);
  65         if ((n == NID_undef) || ((s = OBJ_nid2sn(n)) == NULL)) {
  66             i2t_ASN1_OBJECT(tmp_buf, sizeof(tmp_buf), ne->object);
  67             s = tmp_buf;
  68         }
  69         l1 = strlen(s);
  70
  71         type = ne->value->type;
  72         num = ne->value->length;
  73         if (num > NAME_ONELINE_MAX) {
  74             X509err(X509_F_X509_NAME_ONELINE, X509_R_NAME_TOO_LONG);
  75             goto end;
  76         }
  77         q = ne->value->data;
  78 #ifdef CHARSET_EBCDIC
  79         if (type == V_ASN1_GENERALSTRING ||
  80             type == V_ASN1_VISIBLESTRING ||
  81             type == V_ASN1_PRINTABLESTRING ||
  82             type == V_ASN1_TELETEXSTRING ||
  83             type == V_ASN1_IA5STRING) {
  84             if (num > (int)sizeof(ebcdic_buf))
  85                 num = sizeof(ebcdic_buf);
  86             ascii2ebcdic(ebcdic_buf, q, num);
  87             q = ebcdic_buf;
  88         }
  89 #endif
  90
  91         if ((type == V_ASN1_GENERALSTRING) && ((num % 4) == 0)) {
  92             gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 0;
  93             for (j = 0; j < num; j++)
  94                 if (q[j] != 0)
  95                     gs_doit[j & 3] = 1;
  96
  97             if (gs_doit[0] | gs_doit[1] | gs_doit[2])
  98                 gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;
  99             else {
 100                 gs_doit[0] = gs_doit[1] = gs_doit[2] = 0;
 101                 gs_doit[3] = 1;
 102             }
 103         } else
 104             gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;
 105
 106         for (l2 = j = 0; j < num; j++) {
 107             if (!gs_doit[j & 3])
 108                 continue;
 109             l2++;
 110 #ifndef CHARSET_EBCDIC
 111             if ((q[j] < ' ') || (q[j] > '~'))
 112                 l2 += 3;
 113 #else
 114             if ((os_toascii[q[j]] < os_toascii[' ']) ||
 115                 (os_toascii[q[j]] > os_toascii['~']))
 116                 l2 += 3;
 117 #endif
 118         }
 119
 120         lold = l;
 121         l += 1 + l1 + 1 + l2;
 122         if (l > NAME_ONELINE_MAX) {
 123             X509err(X509_F_X509_NAME_ONELINE, X509_R_NAME_TOO_LONG);
 124             goto end;
 125         }
 126         if (b != NULL) {
 127             if (!BUF_MEM_grow(b, l + 1))
 128                 goto err;
 129             p = &(b->data[lold]);
 130         } else if (l > len) {
 131             break;
 132         } else
 133             p = &(buf[lold]);
 134         *(p++) = '/';
 135         memcpy(p, s, (unsigned int)l1);
 136         p += l1;
 137         *(p++) = '=';
 138
 139 #ifndef CHARSET_EBCDIC          /* q was assigned above already. */
 140         q = ne->value->data;
 141 #endif
 142
 143         for (j = 0; j < num; j++) {
 144             if (!gs_doit[j & 3])
 145                 continue;
 146 #ifndef CHARSET_EBCDIC
 147             n = q[j];
 148             if ((n < ' ') || (n > '~')) {
 149                 *(p++) = '\\';
 150                 *(p++) = 'x';
 151                 *(p++) = hex[(n >> 4) & 0x0f];
 152                 *(p++) = hex[n & 0x0f];
 153             } else
 154                 *(p++) = n;
 155 #else
 156             n = os_toascii[q[j]];
 157             if ((n < os_toascii[' ']) || (n > os_toascii['~'])) {
 158                 *(p++) = '\\';
 159                 *(p++) = 'x';
 160                 *(p++) = hex[(n >> 4) & 0x0f];
 161                 *(p++) = hex[n & 0x0f];
 162             } else
 163                 *(p++) = q[j];
 164 #endif
 165         }
 166         *p = '\0';
 167     }
 168     if (b != NULL) {
 169         p = b->data;
 170         OPENSSL_free(b);
 171     } else
 172         p = buf;
 173     if (i == 0)
 174         *p = '\0';
 175     return p;
 176  err:
 177     X509err(X509_F_X509_NAME_ONELINE, ERR_R_MALLOC_FAILURE);
 178  end:
 179     BUF_MEM_free(b);
 180     return NULL;
 181 }