1 /*
2 * Copyright 1995-2024 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
X509_NAME_oneline(const X509_NAME * a,char * buf,int len)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 int gs_doit[4];
36 char tmp_buf[80];
37 #ifdef CHARSET_EBCDIC
38 unsigned char ebcdic_buf[1024];
39 #endif
40
41 if (buf == NULL) {
42 if ((b = BUF_MEM_new()) == NULL)
43 goto buferr;
44 if (!BUF_MEM_grow(b, 200))
45 goto buferr;
46 b->data[0] = '\0';
47 len = 200;
48 } else if (len == 0) {
49 return NULL;
50 }
51 if (a == NULL) {
52 if (b) {
53 buf = b->data;
54 OPENSSL_free(b);
55 }
56 strncpy(buf, "NO X509_NAME", len);
57 buf[len - 1] = '\0';
58 return buf;
59 }
60
61 len--; /* space for '\0' */
62 l = 0;
63 for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
64 ne = sk_X509_NAME_ENTRY_value(a->entries, i);
65 n = OBJ_obj2nid(ne->object);
66 if ((n == NID_undef) || ((s = OBJ_nid2sn(n)) == NULL)) {
67 i2t_ASN1_OBJECT(tmp_buf, sizeof(tmp_buf), ne->object);
68 s = tmp_buf;
69 }
70 l1 = strlen(s);
71
72 type = ne->value->type;
73 num = ne->value->length;
74 if (num > NAME_ONELINE_MAX) {
75 ERR_raise(ERR_LIB_X509, X509_R_NAME_TOO_LONG);
76 goto end;
77 }
78 q = ne->value->data;
79 #ifdef CHARSET_EBCDIC
80 if (type == V_ASN1_GENERALSTRING ||
81 type == V_ASN1_VISIBLESTRING ||
82 type == V_ASN1_PRINTABLESTRING ||
83 type == V_ASN1_TELETEXSTRING ||
84 type == V_ASN1_IA5STRING) {
85 if (num > (int)sizeof(ebcdic_buf))
86 num = sizeof(ebcdic_buf);
87 ascii2ebcdic(ebcdic_buf, q, num);
88 q = ebcdic_buf;
89 }
90 #endif
91
92 if ((type == V_ASN1_GENERALSTRING) && ((num % 4) == 0)) {
93 gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 0;
94 for (j = 0; j < num; j++)
95 if (q[j] != 0)
96 gs_doit[j & 3] = 1;
97
98 if (gs_doit[0] | gs_doit[1] | gs_doit[2])
99 gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;
100 else {
101 gs_doit[0] = gs_doit[1] = gs_doit[2] = 0;
102 gs_doit[3] = 1;
103 }
104 } else
105 gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;
106
107 for (l2 = j = 0; j < num; j++) {
108 if (!gs_doit[j & 3])
109 continue;
110 l2++;
111 if (q[j] == '/' || q[j] == '+')
112 l2++; /* char needs to be escaped */
113 else if ((ossl_toascii(q[j]) < ossl_toascii(' ')) ||
114 (ossl_toascii(q[j]) > ossl_toascii('~')))
115 l2 += 3;
116 }
117
118 lold = l;
119 l += 1 + l1 + 1 + l2;
120 if (l > NAME_ONELINE_MAX) {
121 ERR_raise(ERR_LIB_X509, X509_R_NAME_TOO_LONG);
122 goto end;
123 }
124 if (b != NULL) {
125 if (!BUF_MEM_grow(b, l + 1))
126 goto buferr;
127 p = &(b->data[lold]);
128 } else if (l > len) {
129 break;
130 } else
131 p = &(buf[lold]);
132 *(p++) = prev_set == ne->set ? '+' : '/';
133 memcpy(p, s, (unsigned int)l1);
134 p += l1;
135 *(p++) = '=';
136
137 #ifndef CHARSET_EBCDIC /* q was assigned above already. */
138 q = ne->value->data;
139 #endif
140
141 for (j = 0; j < num; j++) {
142 if (!gs_doit[j & 3])
143 continue;
144 #ifndef CHARSET_EBCDIC
145 n = q[j];
146 if ((n < ' ') || (n > '~')) {
147 *(p++) = '\\';
148 *(p++) = 'x';
149 p += ossl_to_hex(p, n);
150 } else {
151 if (n == '/' || n == '+')
152 *(p++) = '\\';
153 *(p++) = n;
154 }
155 #else
156 n = os_toascii[q[j]];
157 if ((n < os_toascii[' ']) || (n > os_toascii['~'])) {
158 *(p++) = '\\';
159 *(p++) = 'x';
160 p += ossl_to_hex(p, n);
161 } else {
162 if (n == os_toascii['/'] || n == os_toascii['+'])
163 *(p++) = '\\';
164 *(p++) = q[j];
165 }
166 #endif
167 }
168 *p = '\0';
169 prev_set = ne->set;
170 }
171 if (b != NULL) {
172 p = b->data;
173 OPENSSL_free(b);
174 } else
175 p = buf;
176 if (i == 0)
177 *p = '\0';
178 return p;
179 buferr:
180 ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);
181 end:
182 BUF_MEM_free(b);
183 return NULL;
184 }
185
