crypto/x509/x509_obj.c

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 "crypto/x509.h"
  16 #include "crypto/ctype.h"
  17
  18 /*
  19  * Limit to ensure we don't overflow: much greater than
  20  * anything encountered in practice.
  21  */
  22
  23 #define NAME_ONELINE_MAX    (1024 * 1024)
  24
  25 char *X509_NAME_oneline(const X509_NAME *a, char *buf, int len)
  26 {
  27     const X509_NAME_ENTRY *ne;
  28     int i;
  29     int n, lold, l, l1, l2, num, j, type;
  30     int prev_set = -1;
  31     const char *s;
  32     char *p;
  33     unsigned char *q;
  34     BUF_MEM *b = NULL;
  35     static const char hex[17] = "0123456789ABCDEF";
  36     int gs_doit[4];
  37     char tmp_buf[80];
  38 #ifdef CHARSET_EBCDIC
  39     unsigned char ebcdic_buf[1024];
  40 #endif
  41
  42     if (buf == NULL) {
  43         if ((b = BUF_MEM_new()) == NULL)
  44             goto buferr;
  45         if (!BUF_MEM_grow(b, 200))
  46             goto buferr;
  47         b->data[0] = '\0';
  48         len = 200;
  49     } else if (len == 0) {
  50         return NULL;
  51     }
  52     if (a == NULL) {
  53         if (b) {
  54             buf = b->data;
  55             OPENSSL_free(b);
  56         }
  57         strncpy(buf, "NO X509_NAME", len);
  58         buf[len - 1] = '\0';
  59         return buf;
  60     }
  61
  62     len--;                      /* space for '\0' */
  63     l = 0;
  64     for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
  65         ne = sk_X509_NAME_ENTRY_value(a->entries, i);
  66         n = OBJ_obj2nid(ne->object);
  67         if ((n == NID_undef) || ((s = OBJ_nid2sn(n)) == NULL)) {
  68             i2t_ASN1_OBJECT(tmp_buf, sizeof(tmp_buf), ne->object);
  69             s = tmp_buf;
  70         }
  71         l1 = strlen(s);
  72
  73         type = ne->value->type;
  74         num = ne->value->length;
  75         if (num > NAME_ONELINE_MAX) {
  76             ERR_raise(ERR_LIB_X509, X509_R_NAME_TOO_LONG);
  77             goto end;
  78         }
  79         q = ne->value->data;
  80 #ifdef CHARSET_EBCDIC
  81         if (type == V_ASN1_GENERALSTRING ||
  82             type == V_ASN1_VISIBLESTRING ||
  83             type == V_ASN1_PRINTABLESTRING ||
  84             type == V_ASN1_TELETEXSTRING ||
  85             type == V_ASN1_IA5STRING) {
  86             if (num > (int)sizeof(ebcdic_buf))
  87                 num = sizeof(ebcdic_buf);
  88             ascii2ebcdic(ebcdic_buf, q, num);
  89             q = ebcdic_buf;
  90         }
  91 #endif
  92
  93         if ((type == V_ASN1_GENERALSTRING) && ((num % 4) == 0)) {
  94             gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 0;
  95             for (j = 0; j < num; j++)
  96                 if (q[j] != 0)
  97                     gs_doit[j & 3] = 1;
  98
  99             if (gs_doit[0] | gs_doit[1] | gs_doit[2])
 100                 gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;
 101             else {
 102                 gs_doit[0] = gs_doit[1] = gs_doit[2] = 0;
 103                 gs_doit[3] = 1;
 104             }
 105         } else
 106             gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;
 107
 108         for (l2 = j = 0; j < num; j++) {
 109             if (!gs_doit[j & 3])
 110                 continue;
 111             l2++;
 112             if (q[j] == '/' || q[j] == '+')
 113                 l2++; /* char needs to be escaped */
 114             else if ((ossl_toascii(q[j]) < ossl_toascii(' ')) ||
 115                      (ossl_toascii(q[j]) > ossl_toascii('~')))
 116                 l2 += 3;
 117         }
 118
 119         lold = l;
 120         l += 1 + l1 + 1 + l2;
 121         if (l > NAME_ONELINE_MAX) {
 122             ERR_raise(ERR_LIB_X509, X509_R_NAME_TOO_LONG);
 123             goto end;
 124         }
 125         if (b != NULL) {
 126             if (!BUF_MEM_grow(b, l + 1))
 127                 goto buferr;
 128             p = &(b->data[lold]);
 129         } else if (l > len) {
 130             break;
 131         } else
 132             p = &(buf[lold]);
 133         *(p++) = prev_set == ne->set ? '+' : '/';
 134         memcpy(p, s, (unsigned int)l1);
 135         p += l1;
 136         *(p++) = '=';
 137
 138 #ifndef CHARSET_EBCDIC          /* q was assigned above already. */
 139         q = ne->value->data;
 140 #endif
 141
 142         for (j = 0; j < num; j++) {
 143             if (!gs_doit[j & 3])
 144                 continue;
 145 #ifndef CHARSET_EBCDIC
 146             n = q[j];
 147             if ((n < ' ') || (n > '~')) {
 148                 *(p++) = '\\';
 149                 *(p++) = 'x';
 150                 *(p++) = hex[(n >> 4) & 0x0f];
 151                 *(p++) = hex[n & 0x0f];
 152             } else {
 153                 if (n == '/' || n == '+')
 154                     *(p++) = '\\';
 155                 *(p++) = n;
 156             }
 157 #else
 158             n = os_toascii[q[j]];
 159             if ((n < os_toascii[' ']) || (n > os_toascii['~'])) {
 160                 *(p++) = '\\';
 161                 *(p++) = 'x';
 162                 *(p++) = hex[(n >> 4) & 0x0f];
 163                 *(p++) = hex[n & 0x0f];
 164             } else {
 165                 if (n == os_toascii['/'] || n == os_toascii['+'])
 166                     *(p++) = '\\';
 167                 *(p++) = q[j];
 168             }
 169 #endif
 170         }
 171         *p = '\0';
 172         prev_set = ne->set;
 173     }
 174     if (b != NULL) {
 175         p = b->data;
 176         OPENSSL_free(b);
 177     } else
 178         p = buf;
 179     if (i == 0)
 180         *p = '\0';
 181     return p;
 182  buferr:
 183     ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);
 184  end:
 185     BUF_MEM_free(b);
 186     return NULL;
 187 }