1 /*
2 * Copyright 2016-2020 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 /* Regression tests for ASN.1 parsing bugs. */
11
12 #include <stdio.h>
13 #include <string.h>
14
15 #include "testutil.h"
16
17 #include <openssl/asn1.h>
18 #include <openssl/asn1t.h>
19 #include <openssl/bio.h>
20 #include <openssl/err.h>
21 #include <openssl/x509.h>
22 #include <openssl/x509v3.h>
23 #include "internal/nelem.h"
24
25 static const ASN1_ITEM *item_type;
26 static const char *test_file;
27
28 typedef enum {
29 ASN1_UNKNOWN,
30 ASN1_OK,
31 ASN1_BIO,
32 ASN1_DECODE,
33 ASN1_ENCODE,
34 ASN1_COMPARE
35 } expected_error_t;
36
37 typedef struct {
38 const char *str;
39 expected_error_t code;
40 } error_enum;
41
42 static expected_error_t expected_error = ASN1_UNKNOWN;
43
test_bad_asn1(void)44 static int test_bad_asn1(void)
45 {
46 BIO *bio = NULL;
47 ASN1_VALUE *value = NULL;
48 int ret = 0;
49 unsigned char buf[2048];
50 const unsigned char *buf_ptr = buf;
51 unsigned char *der = NULL;
52 int derlen;
53 int len;
54
55 bio = BIO_new_file(test_file, "r");
56 if (!TEST_ptr(bio))
57 return 0;
58
59 if (expected_error == ASN1_BIO) {
60 if (TEST_ptr_null(ASN1_item_d2i_bio(item_type, bio, NULL)))
61 ret = 1;
62 goto err;
63 }
64
65 /*
66 * Unless we are testing it we don't use ASN1_item_d2i_bio because it
67 * performs sanity checks on the input and can reject it before the
68 * decoder is called.
69 */
70 len = BIO_read(bio, buf, sizeof(buf));
71 if (!TEST_int_ge(len, 0))
72 goto err;
73
74 value = ASN1_item_d2i(NULL, &buf_ptr, len, item_type);
75 if (value == NULL) {
76 if (TEST_int_eq(expected_error, ASN1_DECODE))
77 ret = 1;
78 goto err;
79 }
80
81 derlen = ASN1_item_i2d(value, &der, item_type);
82
83 if (der == NULL || derlen < 0) {
84 if (TEST_int_eq(expected_error, ASN1_ENCODE))
85 ret = 1;
86 goto err;
87 }
88
89 if (derlen != len || memcmp(der, buf, derlen) != 0) {
90 if (TEST_int_eq(expected_error, ASN1_COMPARE))
91 ret = 1;
92 goto err;
93 }
94
95 if (TEST_int_eq(expected_error, ASN1_OK))
96 ret = 1;
97
98 err:
99 /* Don't indicate success for memory allocation errors */
100 if (ret == 1
101 && !TEST_false(ERR_GET_REASON(ERR_peek_error()) == ERR_R_MALLOC_FAILURE))
102 ret = 0;
103 BIO_free(bio);
104 OPENSSL_free(der);
105 ASN1_item_free(value, item_type);
106 return ret;
107 }
108
109 OPT_TEST_DECLARE_USAGE("item_name expected_error test_file.der\n")
110
111 /*
112 * Usage: d2i_test <name> <type> <file>, e.g.
113 * d2i_test generalname bad_generalname.der
114 */
setup_tests(void)115 int setup_tests(void)
116 {
117 const char *test_type_name;
118 const char *expected_error_string;
119
120 size_t i;
121
122 static error_enum expected_errors[] = {
123 {"OK", ASN1_OK},
124 {"BIO", ASN1_BIO},
125 {"decode", ASN1_DECODE},
126 {"encode", ASN1_ENCODE},
127 {"compare", ASN1_COMPARE}
128 };
129
130 if (!test_skip_common_options()) {
131 TEST_error("Error parsing test options\n");
132 return 0;
133 }
134
135 if (!TEST_ptr(test_type_name = test_get_argument(0))
136 || !TEST_ptr(expected_error_string = test_get_argument(1))
137 || !TEST_ptr(test_file = test_get_argument(2)))
138 return 0;
139
140 item_type = ASN1_ITEM_lookup(test_type_name);
141
142 if (item_type == NULL) {
143 TEST_error("Unknown type %s", test_type_name);
144 TEST_note("Supported types:");
145 for (i = 0;; i++) {
146 const ASN1_ITEM *it = ASN1_ITEM_get(i);
147
148 if (it == NULL)
149 break;
150 TEST_note("\t%s", it->sname);
151 }
152 return 0;
153 }
154
155 for (i = 0; i < OSSL_NELEM(expected_errors); i++) {
156 if (strcmp(expected_errors[i].str, expected_error_string) == 0) {
157 expected_error = expected_errors[i].code;
158 break;
159 }
160 }
161
162 if (expected_error == ASN1_UNKNOWN) {
163 TEST_error("Unknown expected error %s\n", expected_error_string);
164 return 0;
165 }
166
167 ADD_TEST(test_bad_asn1);
168 return 1;
169 }
170