crypto/pem/pem_info.c

   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
  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
  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
  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
 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 */
 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 }