xref: /openssl/crypto/pem/pem_info.c (revision e077455e)
1 /*
2  * Copyright 1995-2021 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 /*
11  * DSA low level APIs are deprecated for public use, but still ok for
12  * internal use.
13  */
14 #include "internal/deprecated.h"
15 
16 #include <stdio.h>
17 #include "internal/cryptlib.h"
18 #include <openssl/buffer.h>
19 #include <openssl/objects.h>
20 #include <openssl/evp.h>
21 #include <openssl/x509.h>
22 #include <openssl/pem.h>
23 #include <openssl/rsa.h>
24 #include <openssl/dsa.h>
25 #include "crypto/evp.h"
26 
27 #ifndef OPENSSL_NO_STDIO
STACK_OF(X509_INFO)28 STACK_OF(X509_INFO)
29 *PEM_X509_INFO_read_ex(FILE *fp, STACK_OF(X509_INFO) *sk, pem_password_cb *cb,
30                        void *u, OSSL_LIB_CTX *libctx, const char *propq)
31 {
32     BIO *b;
33     STACK_OF(X509_INFO) *ret;
34 
35     if ((b = BIO_new(BIO_s_file())) == NULL) {
36         ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
37         return 0;
38     }
39     BIO_set_fp(b, fp, BIO_NOCLOSE);
40     ret = PEM_X509_INFO_read_bio_ex(b, sk, cb, u, libctx, propq);
41     BIO_free(b);
42     return ret;
43 }
44 
STACK_OF(X509_INFO)45 STACK_OF(X509_INFO) *PEM_X509_INFO_read(FILE *fp, STACK_OF(X509_INFO) *sk,
46                                         pem_password_cb *cb, void *u)
47 {
48     return PEM_X509_INFO_read_ex(fp, sk, cb, u, NULL, NULL);
49 }
50 #endif
51 
STACK_OF(X509_INFO)52 STACK_OF(X509_INFO) *PEM_X509_INFO_read_bio_ex(BIO *bp, STACK_OF(X509_INFO) *sk,
53                                                pem_password_cb *cb, void *u,
54                                                OSSL_LIB_CTX *libctx,
55                                                const char *propq)
56 {
57     X509_INFO *xi = NULL;
58     char *name = NULL, *header = NULL, *str;
59     void *pp;
60     unsigned char *data = NULL;
61     const unsigned char *p;
62     long len, error = 0;
63     int ok = 0;
64     STACK_OF(X509_INFO) *ret = NULL;
65     unsigned int i, raw, ptype;
66     d2i_of_void *d2i = 0;
67 
68     if (sk == NULL) {
69         if ((ret = sk_X509_INFO_new_null()) == NULL) {
70             ERR_raise(ERR_LIB_PEM, ERR_R_CRYPTO_LIB);
71             goto err;
72         }
73     } else
74         ret = sk;
75 
76     if ((xi = X509_INFO_new()) == NULL)
77         goto err;
78     for (;;) {
79         raw = 0;
80         ptype = 0;
81         ERR_set_mark();
82         i = PEM_read_bio(bp, &name, &header, &data, &len);
83         if (i == 0) {
84             error = ERR_GET_REASON(ERR_peek_last_error());
85             if (error == PEM_R_NO_START_LINE) {
86                 ERR_pop_to_mark();
87                 break;
88             }
89             ERR_clear_last_mark();
90             goto err;
91         }
92         ERR_clear_last_mark();
93  start:
94         if (strcmp(name, PEM_STRING_X509) == 0
95                 || strcmp(name, PEM_STRING_X509_OLD) == 0
96                 || strcmp(name, PEM_STRING_X509_TRUSTED) == 0) {
97             if (xi->x509 != NULL) {
98                 if (!sk_X509_INFO_push(ret, xi))
99                     goto err;
100                 if ((xi = X509_INFO_new()) == NULL)
101                     goto err;
102                 goto start;
103             }
104             if ((strcmp(name, PEM_STRING_X509_TRUSTED) == 0))
105                 d2i = (D2I_OF(void)) d2i_X509_AUX;
106             else
107                 d2i = (D2I_OF(void)) d2i_X509;
108             xi->x509 = X509_new_ex(libctx, propq);
109             if (xi->x509 == NULL)
110                 goto err;
111             pp = &(xi->x509);
112         } else if (strcmp(name, PEM_STRING_X509_CRL) == 0) {
113             d2i = (D2I_OF(void)) d2i_X509_CRL;
114             if (xi->crl != NULL) {
115                 if (!sk_X509_INFO_push(ret, xi))
116                     goto err;
117                 if ((xi = X509_INFO_new()) == NULL)
118                     goto err;
119                 goto start;
120             }
121             pp = &(xi->crl);
122         } else if ((str = strstr(name, PEM_STRING_PKCS8INF)) != NULL) {
123             if (xi->x_pkey != NULL) {
124                 if (!sk_X509_INFO_push(ret, xi))
125                     goto err;
126                 if ((xi = X509_INFO_new()) == NULL)
127                     goto err;
128                 goto start;
129             }
130             if (str == name || strcmp(name, PEM_STRING_PKCS8) == 0) {
131                 ptype = EVP_PKEY_NONE;
132             } else {
133                 /* chop " PRIVATE KEY" */
134                 *--str = '\0';
135                 ptype = evp_pkey_name2type(name);
136             }
137             xi->enc_data = NULL;
138             xi->enc_len = 0;
139 
140             d2i = (D2I_OF(void)) d2i_AutoPrivateKey;
141             xi->x_pkey = X509_PKEY_new();
142             if (xi->x_pkey == NULL)
143                 goto err;
144             pp = &xi->x_pkey->dec_pkey;
145             if ((int)strlen(header) > 10 /* assume encrypted */
146                    || strcmp(name, PEM_STRING_PKCS8) == 0)
147                 raw = 1;
148         } else { /* unknown */
149             d2i = NULL;
150             pp = NULL;
151         }
152 
153         if (d2i != NULL) {
154             if (!raw) {
155                 EVP_CIPHER_INFO cipher;
156 
157                 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
158                     goto err;
159                 if (!PEM_do_header(&cipher, data, &len, cb, u))
160                     goto err;
161                 p = data;
162                 if (ptype) {
163                     if (d2i_PrivateKey_ex(ptype, pp, &p, len,
164                                           libctx, propq) == NULL) {
165                         ERR_raise(ERR_LIB_PEM, ERR_R_ASN1_LIB);
166                         goto err;
167                     }
168                 } else if (d2i(pp, &p, len) == NULL) {
169                     ERR_raise(ERR_LIB_PEM, ERR_R_ASN1_LIB);
170                     goto err;
171                 }
172             } else {            /* encrypted key data */
173                 if (!PEM_get_EVP_CIPHER_INFO(header, &xi->enc_cipher))
174                     goto err;
175                 xi->enc_data = (char *)data;
176                 xi->enc_len = (int)len;
177                 data = NULL;
178             }
179         }
180         OPENSSL_free(name);
181         name = NULL;
182         OPENSSL_free(header);
183         header = NULL;
184         OPENSSL_free(data);
185         data = NULL;
186     }
187 
188     /*
189      * if the last one hasn't been pushed yet and there is anything in it
190      * then add it to the stack ...
191      */
192     if ((xi->x509 != NULL) || (xi->crl != NULL) ||
193         (xi->x_pkey != NULL) || (xi->enc_data != NULL)) {
194         if (!sk_X509_INFO_push(ret, xi))
195             goto err;
196         xi = NULL;
197     }
198     ok = 1;
199  err:
200     X509_INFO_free(xi);
201     if (!ok) {
202         for (i = 0; ((int)i) < sk_X509_INFO_num(ret); i++) {
203             xi = sk_X509_INFO_value(ret, i);
204             X509_INFO_free(xi);
205         }
206         if (ret != sk)
207             sk_X509_INFO_free(ret);
208         ret = NULL;
209     }
210 
211     OPENSSL_free(name);
212     OPENSSL_free(header);
213     OPENSSL_free(data);
214     return ret;
215 }
216 
STACK_OF(X509_INFO)217 STACK_OF(X509_INFO) *PEM_X509_INFO_read_bio(BIO *bp, STACK_OF(X509_INFO) *sk,
218                                             pem_password_cb *cb, void *u)
219 {
220     return PEM_X509_INFO_read_bio_ex(bp, sk, cb, u, NULL, NULL);
221 }
222 
223 /* A TJH addition */
PEM_X509_INFO_write_bio(BIO * bp,const X509_INFO * xi,EVP_CIPHER * enc,const unsigned char * kstr,int klen,pem_password_cb * cb,void * u)224 int PEM_X509_INFO_write_bio(BIO *bp, const X509_INFO *xi, EVP_CIPHER *enc,
225                             const unsigned char *kstr, int klen,
226                             pem_password_cb *cb, void *u)
227 {
228     int i, ret = 0;
229     unsigned char *data = NULL;
230     const char *objstr = NULL;
231     char buf[PEM_BUFSIZE];
232     const unsigned char *iv = NULL;
233 
234     if (enc != NULL) {
235         objstr = EVP_CIPHER_get0_name(enc);
236         if (objstr == NULL
237                /*
238                 * Check "Proc-Type: 4,Encrypted\nDEK-Info: objstr,hex-iv\n"
239                 * fits into buf
240                 */
241             || strlen(objstr) + 23 + 2 * EVP_CIPHER_get_iv_length(enc) + 13
242                > sizeof(buf)) {
243             ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_CIPHER);
244             goto err;
245         }
246     }
247 
248     /*
249      * now for the fun part ... if we have a private key then we have to be
250      * able to handle a not-yet-decrypted key being written out correctly ...
251      * if it is decrypted or it is non-encrypted then we use the base code
252      */
253     if (xi->x_pkey != NULL) {
254         if ((xi->enc_data != NULL) && (xi->enc_len > 0)) {
255             if (enc == NULL) {
256                 ERR_raise(ERR_LIB_PEM, PEM_R_CIPHER_IS_NULL);
257                 goto err;
258             }
259 
260             /* copy from weirdo names into more normal things */
261             iv = xi->enc_cipher.iv;
262             data = (unsigned char *)xi->enc_data;
263             i = xi->enc_len;
264 
265             /*
266              * we take the encryption data from the internal stuff rather
267              * than what the user has passed us ... as we have to match
268              * exactly for some strange reason
269              */
270             objstr = EVP_CIPHER_get0_name(xi->enc_cipher.cipher);
271             if (objstr == NULL) {
272                 ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_CIPHER);
273                 goto err;
274             }
275 
276             /* Create the right magic header stuff */
277             buf[0] = '\0';
278             PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
279             PEM_dek_info(buf, objstr, EVP_CIPHER_get_iv_length(enc),
280                          (const char *)iv);
281 
282             /* use the normal code to write things out */
283             i = PEM_write_bio(bp, PEM_STRING_RSA, buf, data, i);
284             if (i <= 0)
285                 goto err;
286         } else {
287             /* Add DSA/DH */
288             /* normal optionally encrypted stuff */
289             if (PEM_write_bio_RSAPrivateKey(bp,
290                                             EVP_PKEY_get0_RSA(xi->x_pkey->dec_pkey),
291                                             enc, kstr, klen, cb, u) <= 0)
292                 goto err;
293         }
294     }
295 
296     /* if we have a certificate then write it out now */
297     if ((xi->x509 != NULL) && (PEM_write_bio_X509(bp, xi->x509) <= 0))
298         goto err;
299 
300     /*
301      * we are ignoring anything else that is loaded into the X509_INFO
302      * structure for the moment ... as I don't need it so I'm not coding it
303      * here and Eric can do it when this makes it into the base library --tjh
304      */
305 
306     ret = 1;
307 
308  err:
309     OPENSSL_cleanse(buf, PEM_BUFSIZE);
310     return ret;
311 }
312