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 "crypto/x509.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
24char *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}
182