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1 | /* | |
2 | * Copyright 2015-2022 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 <string.h> | |
12 | #include <openssl/crypto.h> | |
13 | #include <openssl/bio.h> | |
14 | #include <openssl/x509.h> | |
15 | #include <openssl/x509v3.h> | |
16 | #include <openssl/pem.h> | |
17 | #include <openssl/err.h> | |
18 | #include "testutil.h" | |
19 | ||
20 | static const char *certs_dir; | |
21 | static char *root_f = NULL; | |
22 | static char *roots_f = NULL; | |
23 | static char *untrusted_f = NULL; | |
24 | static char *bad_f = NULL; | |
25 | static char *req_f = NULL; | |
26 | static char *sroot_cert = NULL; | |
27 | static char *ca_cert = NULL; | |
28 | static char *ee_cert = NULL; | |
29 | ||
30 | #define load_cert_from_file(file) load_cert_pem(file, NULL) | |
31 | ||
32 | /*- | |
33 | * Test for CVE-2015-1793 (Alternate Chains Certificate Forgery) | |
34 | * | |
35 | * Chain is as follows: | |
36 | * | |
37 | * rootCA (self-signed) | |
38 | * | | |
39 | * interCA | |
40 | * | | |
41 | * subinterCA subinterCA (self-signed) | |
42 | * | | | |
43 | * leaf ------------------ | |
44 | * | | |
45 | * bad | |
46 | * | |
47 | * rootCA, interCA, subinterCA, subinterCA (ss) all have CA=TRUE | |
48 | * leaf and bad have CA=FALSE | |
49 | * | |
50 | * subinterCA and subinterCA (ss) have the same subject name and keys | |
51 | * | |
52 | * interCA (but not rootCA) and subinterCA (ss) are in the trusted store | |
53 | * (roots.pem) | |
54 | * leaf and subinterCA are in the untrusted list (untrusted.pem) | |
55 | * bad is the certificate being verified (bad.pem) | |
56 | * | |
57 | * Versions vulnerable to CVE-2015-1793 will fail to detect that leaf has | |
58 | * CA=FALSE, and will therefore incorrectly verify bad | |
59 | * | |
60 | */ | |
61 | static int test_alt_chains_cert_forgery(void) | |
62 | { | |
63 | int ret = 0; | |
64 | int i; | |
65 | X509 *x = NULL; | |
66 | STACK_OF(X509) *untrusted = NULL; | |
67 | X509_STORE_CTX *sctx = NULL; | |
68 | X509_STORE *store = NULL; | |
69 | X509_LOOKUP *lookup = NULL; | |
70 | ||
71 | store = X509_STORE_new(); | |
72 | if (store == NULL) | |
73 | goto err; | |
74 | ||
75 | lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file()); | |
76 | if (lookup == NULL) | |
77 | goto err; | |
78 | if (!X509_LOOKUP_load_file(lookup, roots_f, X509_FILETYPE_PEM)) | |
79 | goto err; | |
80 | ||
81 | untrusted = load_certs_pem(untrusted_f); | |
82 | ||
83 | if ((x = load_cert_from_file(bad_f)) == NULL) | |
84 | goto err; | |
85 | ||
86 | sctx = X509_STORE_CTX_new(); | |
87 | if (sctx == NULL) | |
88 | goto err; | |
89 | ||
90 | if (!X509_STORE_CTX_init(sctx, store, x, untrusted)) | |
91 | goto err; | |
92 | ||
93 | i = X509_verify_cert(sctx); | |
94 | ||
95 | if (i == 0 && X509_STORE_CTX_get_error(sctx) == X509_V_ERR_INVALID_CA) { | |
96 | /* This is the result we were expecting: Test passed */ | |
97 | ret = 1; | |
98 | } | |
99 | err: | |
100 | X509_STORE_CTX_free(sctx); | |
101 | X509_free(x); | |
102 | OSSL_STACK_OF_X509_free(untrusted); | |
103 | X509_STORE_free(store); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | static int test_distinguishing_id(void) | |
108 | { | |
109 | X509 *x = NULL; | |
110 | int ret = 0; | |
111 | ASN1_OCTET_STRING *v = NULL, *v2 = NULL; | |
112 | char *distid = "this is an ID"; | |
113 | ||
114 | x = load_cert_from_file(bad_f); | |
115 | if (x == NULL) | |
116 | goto err; | |
117 | ||
118 | v = ASN1_OCTET_STRING_new(); | |
119 | if (v == NULL) | |
120 | goto err; | |
121 | ||
122 | if (!ASN1_OCTET_STRING_set(v, (unsigned char *)distid, | |
123 | (int)strlen(distid))) { | |
124 | ASN1_OCTET_STRING_free(v); | |
125 | goto err; | |
126 | } | |
127 | ||
128 | X509_set0_distinguishing_id(x, v); | |
129 | ||
130 | v2 = X509_get0_distinguishing_id(x); | |
131 | if (!TEST_ptr(v2) | |
132 | || !TEST_int_eq(ASN1_OCTET_STRING_cmp(v, v2), 0)) | |
133 | goto err; | |
134 | ||
135 | ret = 1; | |
136 | err: | |
137 | X509_free(x); | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static int test_req_distinguishing_id(void) | |
142 | { | |
143 | X509_REQ *x = NULL; | |
144 | BIO *bio = NULL; | |
145 | int ret = 0; | |
146 | ASN1_OCTET_STRING *v = NULL, *v2 = NULL; | |
147 | char *distid = "this is an ID"; | |
148 | ||
149 | bio = BIO_new_file(req_f, "r"); | |
150 | if (bio == NULL) | |
151 | goto err; | |
152 | ||
153 | x = PEM_read_bio_X509_REQ(bio, NULL, 0, NULL); | |
154 | if (x == NULL) | |
155 | goto err; | |
156 | ||
157 | v = ASN1_OCTET_STRING_new(); | |
158 | if (v == NULL) | |
159 | goto err; | |
160 | ||
161 | if (!ASN1_OCTET_STRING_set(v, (unsigned char *)distid, | |
162 | (int)strlen(distid))) { | |
163 | ASN1_OCTET_STRING_free(v); | |
164 | goto err; | |
165 | } | |
166 | ||
167 | X509_REQ_set0_distinguishing_id(x, v); | |
168 | ||
169 | v2 = X509_REQ_get0_distinguishing_id(x); | |
170 | if (!TEST_ptr(v2) | |
171 | || !TEST_int_eq(ASN1_OCTET_STRING_cmp(v, v2), 0)) | |
172 | goto err; | |
173 | ||
174 | ret = 1; | |
175 | err: | |
176 | X509_REQ_free(x); | |
177 | BIO_free(bio); | |
178 | return ret; | |
179 | } | |
180 | ||
181 | static int test_self_signed(const char *filename, int use_trusted, int expected) | |
182 | { | |
183 | X509 *cert = load_cert_from_file(filename); /* may result in NULL */ | |
184 | STACK_OF(X509) *trusted = sk_X509_new_null(); | |
185 | X509_STORE_CTX *ctx = X509_STORE_CTX_new(); | |
186 | int ret; | |
187 | ||
188 | ret = TEST_int_eq(X509_self_signed(cert, 1), expected); | |
189 | ||
190 | if (cert != NULL) { | |
191 | if (use_trusted) | |
192 | ret = ret && TEST_true(sk_X509_push(trusted, cert)); | |
193 | ret = ret && TEST_true(X509_STORE_CTX_init(ctx, NULL, cert, NULL)); | |
194 | X509_STORE_CTX_set0_trusted_stack(ctx, trusted); | |
195 | ret = ret && TEST_int_eq(X509_verify_cert(ctx), expected); | |
196 | } | |
197 | ||
198 | X509_STORE_CTX_free(ctx); | |
199 | sk_X509_free(trusted); | |
200 | X509_free(cert); | |
201 | return ret; | |
202 | } | |
203 | ||
204 | static int test_self_signed_good(void) | |
205 | { | |
206 | return test_self_signed(root_f, 1, 1); | |
207 | } | |
208 | ||
209 | static int test_self_signed_bad(void) | |
210 | { | |
211 | return test_self_signed(bad_f, 1, 0); | |
212 | } | |
213 | ||
214 | static int test_self_signed_error(void) | |
215 | { | |
216 | return test_self_signed("nonexistent file name", 1, -1); | |
217 | } | |
218 | ||
219 | static int test_store_ctx(void) | |
220 | { | |
221 | /* Verifying a cert where we have no trusted certs should fail */ | |
222 | return test_self_signed(bad_f, 0, 0); | |
223 | } | |
224 | ||
225 | static int do_test_purpose(int purpose, int expected) | |
226 | { | |
227 | X509 *eecert = load_cert_from_file(ee_cert); /* may result in NULL */ | |
228 | X509 *untrcert = load_cert_from_file(ca_cert); | |
229 | X509 *trcert = load_cert_from_file(sroot_cert); | |
230 | STACK_OF(X509) *trusted = sk_X509_new_null(); | |
231 | STACK_OF(X509) *untrusted = sk_X509_new_null(); | |
232 | X509_STORE_CTX *ctx = X509_STORE_CTX_new(); | |
233 | int testresult = 0; | |
234 | ||
235 | if (!TEST_ptr(eecert) | |
236 | || !TEST_ptr(untrcert) | |
237 | || !TEST_ptr(trcert) | |
238 | || !TEST_ptr(trusted) | |
239 | || !TEST_ptr(untrusted) | |
240 | || !TEST_ptr(ctx)) | |
241 | goto err; | |
242 | ||
243 | ||
244 | if (!TEST_true(sk_X509_push(trusted, trcert))) | |
245 | goto err; | |
246 | trcert = NULL; | |
247 | if (!TEST_true(sk_X509_push(untrusted, untrcert))) | |
248 | goto err; | |
249 | untrcert = NULL; | |
250 | ||
251 | if (!TEST_true(X509_STORE_CTX_init(ctx, NULL, eecert, untrusted))) | |
252 | goto err; | |
253 | ||
254 | if (!TEST_true(X509_STORE_CTX_set_purpose(ctx, purpose))) | |
255 | goto err; | |
256 | ||
257 | /* | |
258 | * X509_STORE_CTX_set0_trusted_stack() is bady named. Despite the set0 name | |
259 | * we are still responsible for freeing trusted after we have finished with | |
260 | * it. | |
261 | */ | |
262 | X509_STORE_CTX_set0_trusted_stack(ctx, trusted); | |
263 | ||
264 | if (!TEST_int_eq(X509_verify_cert(ctx), expected)) | |
265 | goto err; | |
266 | ||
267 | testresult = 1; | |
268 | err: | |
269 | OSSL_STACK_OF_X509_free(trusted); | |
270 | OSSL_STACK_OF_X509_free(untrusted); | |
271 | X509_STORE_CTX_free(ctx); | |
272 | X509_free(eecert); | |
273 | X509_free(untrcert); | |
274 | X509_free(trcert); | |
275 | return testresult; | |
276 | } | |
277 | ||
278 | static int test_purpose_ssl_client(void) | |
279 | { | |
280 | return do_test_purpose(X509_PURPOSE_SSL_CLIENT, 0); | |
281 | } | |
282 | ||
283 | static int test_purpose_ssl_server(void) | |
284 | { | |
285 | return do_test_purpose(X509_PURPOSE_SSL_SERVER, 1); | |
286 | } | |
287 | ||
288 | static int test_purpose_any(void) | |
289 | { | |
290 | return do_test_purpose(X509_PURPOSE_ANY, 1); | |
291 | } | |
292 | ||
293 | OPT_TEST_DECLARE_USAGE("certs-dir\n") | |
294 | ||
295 | int setup_tests(void) | |
296 | { | |
297 | if (!test_skip_common_options()) { | |
298 | TEST_error("Error parsing test options\n"); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | if (!TEST_ptr(certs_dir = test_get_argument(0))) | |
303 | return 0; | |
304 | ||
305 | if (!TEST_ptr(root_f = test_mk_file_path(certs_dir, "rootCA.pem")) | |
306 | || !TEST_ptr(roots_f = test_mk_file_path(certs_dir, "roots.pem")) | |
307 | || !TEST_ptr(untrusted_f = test_mk_file_path(certs_dir, "untrusted.pem")) | |
308 | || !TEST_ptr(bad_f = test_mk_file_path(certs_dir, "bad.pem")) | |
309 | || !TEST_ptr(req_f = test_mk_file_path(certs_dir, "sm2-csr.pem")) | |
310 | || !TEST_ptr(sroot_cert = test_mk_file_path(certs_dir, "sroot-cert.pem")) | |
311 | || !TEST_ptr(ca_cert = test_mk_file_path(certs_dir, "ca-cert.pem")) | |
312 | || !TEST_ptr(ee_cert = test_mk_file_path(certs_dir, "ee-cert.pem"))) | |
313 | goto err; | |
314 | ||
315 | ADD_TEST(test_alt_chains_cert_forgery); | |
316 | ADD_TEST(test_store_ctx); | |
317 | ADD_TEST(test_distinguishing_id); | |
318 | ADD_TEST(test_req_distinguishing_id); | |
319 | ADD_TEST(test_self_signed_good); | |
320 | ADD_TEST(test_self_signed_bad); | |
321 | ADD_TEST(test_self_signed_error); | |
322 | ADD_TEST(test_purpose_ssl_client); | |
323 | ADD_TEST(test_purpose_ssl_server); | |
324 | ADD_TEST(test_purpose_any); | |
325 | return 1; | |
326 | err: | |
327 | cleanup_tests(); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | void cleanup_tests(void) | |
332 | { | |
333 | OPENSSL_free(root_f); | |
334 | OPENSSL_free(roots_f); | |
335 | OPENSSL_free(untrusted_f); | |
336 | OPENSSL_free(bad_f); | |
337 | OPENSSL_free(req_f); | |
338 | OPENSSL_free(sroot_cert); | |
339 | OPENSSL_free(ca_cert); | |
340 | OPENSSL_free(ee_cert); | |
341 | } |