crypto/pem/pem_info.c

   1 /*
   2  * Copyright 1995-2020 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 /*
  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
  26 DEFINE_STACK_OF(X509_INFO)
  27
  28 #ifndef OPENSSL_NO_STDIO
  29 STACK_OF(X509_INFO) *PEM_X509_INFO_read(FILE *fp, STACK_OF(X509_INFO) *sk,
  30                                         pem_password_cb *cb, void *u)
  31 {
  32     BIO *b;
  33     STACK_OF(X509_INFO) *ret;
  34
  35     if ((b = BIO_new(BIO_s_file())) == NULL) {
  36         PEMerr(PEM_F_PEM_X509_INFO_READ, ERR_R_BUF_LIB);
  37         return 0;
  38     }
  39     BIO_set_fp(b, fp, BIO_NOCLOSE);
  40     ret = PEM_X509_INFO_read_bio(b, sk, cb, u);
  41     BIO_free(b);
  42     return ret;
  43 }
  44 #endif
  45
  46 STACK_OF(X509_INFO) *PEM_X509_INFO_read_bio(BIO *bp, STACK_OF(X509_INFO) *sk,
  47                                             pem_password_cb *cb, void *u)
  48 {
  49     X509_INFO *xi = NULL;
  50     char *name = NULL, *header = NULL;
  51     void *pp;
  52     unsigned char *data = NULL;
  53     const unsigned char *p;
  54     long len, error = 0;
  55     int ok = 0;
  56     STACK_OF(X509_INFO) *ret = NULL;
  57     unsigned int i, raw, ptype;
  58     d2i_of_void *d2i = 0;
  59
  60     if (sk == NULL) {
  61         if ((ret = sk_X509_INFO_new_null()) == NULL) {
  62             PEMerr(PEM_F_PEM_X509_INFO_READ_BIO, ERR_R_MALLOC_FAILURE);
  63             goto err;
  64         }
  65     } else
  66         ret = sk;
  67
  68     if ((xi = X509_INFO_new()) == NULL)
  69         goto err;
  70     for (;;) {
  71         raw = 0;
  72         ptype = 0;
  73         i = PEM_read_bio(bp, &name, &header, &data, &len);
  74         if (i == 0) {
  75             error = ERR_GET_REASON(ERR_peek_last_error());
  76             if (error == PEM_R_NO_START_LINE) {
  77                 ERR_clear_error();
  78                 break;
  79             }
  80             goto err;
  81         }
  82  start:
  83         if ((strcmp(name, PEM_STRING_X509) == 0) ||
  84             (strcmp(name, PEM_STRING_X509_OLD) == 0)) {
  85             d2i = (D2I_OF(void)) d2i_X509;
  86             if (xi->x509 != NULL) {
  87                 if (!sk_X509_INFO_push(ret, xi))
  88                     goto err;
  89                 if ((xi = X509_INFO_new()) == NULL)
  90                     goto err;
  91                 goto start;
  92             }
  93             pp = &(xi->x509);
  94         } else if ((strcmp(name, PEM_STRING_X509_TRUSTED) == 0)) {
  95             d2i = (D2I_OF(void)) d2i_X509_AUX;
  96             if (xi->x509 != NULL) {
  97                 if (!sk_X509_INFO_push(ret, xi))
  98                     goto err;
  99                 if ((xi = X509_INFO_new()) == NULL)
 100                     goto err;
 101                 goto start;
 102             }
 103             pp = &(xi->x509);
 104         } else if (strcmp(name, PEM_STRING_X509_CRL) == 0) {
 105             d2i = (D2I_OF(void)) d2i_X509_CRL;
 106             if (xi->crl != NULL) {
 107                 if (!sk_X509_INFO_push(ret, xi))
 108                     goto err;
 109                 if ((xi = X509_INFO_new()) == NULL)
 110                     goto err;
 111                 goto start;
 112             }
 113             pp = &(xi->crl);
 114         } else
 115 #ifndef OPENSSL_NO_RSA
 116         if (strcmp(name, PEM_STRING_RSA) == 0) {
 117             d2i = (D2I_OF(void)) d2i_RSAPrivateKey;
 118             if (xi->x_pkey != NULL) {
 119                 if (!sk_X509_INFO_push(ret, xi))
 120                     goto err;
 121                 if ((xi = X509_INFO_new()) == NULL)
 122                     goto err;
 123                 goto start;
 124             }
 125
 126             xi->enc_data = NULL;
 127             xi->enc_len = 0;
 128
 129             xi->x_pkey = X509_PKEY_new();
 130             if (xi->x_pkey == NULL)
 131                 goto err;
 132             ptype = EVP_PKEY_RSA;
 133             pp = &xi->x_pkey->dec_pkey;
 134             if ((int)strlen(header) > 10) /* assume encrypted */
 135                 raw = 1;
 136         } else
 137 #endif
 138 #ifndef OPENSSL_NO_DSA
 139         if (strcmp(name, PEM_STRING_DSA) == 0) {
 140             d2i = (D2I_OF(void)) d2i_DSAPrivateKey;
 141             if (xi->x_pkey != NULL) {
 142                 if (!sk_X509_INFO_push(ret, xi))
 143                     goto err;
 144                 if ((xi = X509_INFO_new()) == NULL)
 145                     goto err;
 146                 goto start;
 147             }
 148
 149             xi->enc_data = NULL;
 150             xi->enc_len = 0;
 151
 152             xi->x_pkey = X509_PKEY_new();
 153             if (xi->x_pkey == NULL)
 154                 goto err;
 155             ptype = EVP_PKEY_DSA;
 156             pp = &xi->x_pkey->dec_pkey;
 157             if ((int)strlen(header) > 10) /* assume encrypted */
 158                 raw = 1;
 159         } else
 160 #endif
 161 #ifndef OPENSSL_NO_EC
 162         if (strcmp(name, PEM_STRING_ECPRIVATEKEY) == 0) {
 163             d2i = (D2I_OF(void)) d2i_ECPrivateKey;
 164             if (xi->x_pkey != NULL) {
 165                 if (!sk_X509_INFO_push(ret, xi))
 166                     goto err;
 167                 if ((xi = X509_INFO_new()) == NULL)
 168                     goto err;
 169                 goto start;
 170             }
 171
 172             xi->enc_data = NULL;
 173             xi->enc_len = 0;
 174
 175             xi->x_pkey = X509_PKEY_new();
 176             if (xi->x_pkey == NULL)
 177                 goto err;
 178             ptype = EVP_PKEY_EC;
 179             pp = &xi->x_pkey->dec_pkey;
 180             if ((int)strlen(header) > 10) /* assume encrypted */
 181                 raw = 1;
 182         } else
 183 #endif
 184         {
 185             d2i = NULL;
 186             pp = NULL;
 187         }
 188
 189         if (d2i != NULL) {
 190             if (!raw) {
 191                 EVP_CIPHER_INFO cipher;
 192
 193                 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
 194                     goto err;
 195                 if (!PEM_do_header(&cipher, data, &len, cb, u))
 196                     goto err;
 197                 p = data;
 198                 if (ptype) {
 199                     if (!d2i_PrivateKey(ptype, pp, &p, len)) {
 200                         PEMerr(PEM_F_PEM_X509_INFO_READ_BIO, ERR_R_ASN1_LIB);
 201                         goto err;
 202                     }
 203                 } else if (d2i(pp, &p, len) == NULL) {
 204                     PEMerr(PEM_F_PEM_X509_INFO_READ_BIO, ERR_R_ASN1_LIB);
 205                     goto err;
 206                 }
 207             } else {            /* encrypted RSA data */
 208                 if (!PEM_get_EVP_CIPHER_INFO(header, &xi->enc_cipher))
 209                     goto err;
 210                 xi->enc_data = (char *)data;
 211                 xi->enc_len = (int)len;
 212                 data = NULL;
 213             }
 214         } else {
 215             /* unknown */
 216         }
 217         OPENSSL_free(name);
 218         name = NULL;
 219         OPENSSL_free(header);
 220         header = NULL;
 221         OPENSSL_free(data);
 222         data = NULL;
 223     }
 224
 225     /*
 226      * if the last one hasn't been pushed yet and there is anything in it
 227      * then add it to the stack ...
 228      */
 229     if ((xi->x509 != NULL) || (xi->crl != NULL) ||
 230         (xi->x_pkey != NULL) || (xi->enc_data != NULL)) {
 231         if (!sk_X509_INFO_push(ret, xi))
 232             goto err;
 233         xi = NULL;
 234     }
 235     ok = 1;
 236  err:
 237     X509_INFO_free(xi);
 238     if (!ok) {
 239         for (i = 0; ((int)i) < sk_X509_INFO_num(ret); i++) {
 240             xi = sk_X509_INFO_value(ret, i);
 241             X509_INFO_free(xi);
 242         }
 243         if (ret != sk)
 244             sk_X509_INFO_free(ret);
 245         ret = NULL;
 246     }
 247
 248     OPENSSL_free(name);
 249     OPENSSL_free(header);
 250     OPENSSL_free(data);
 251     return ret;
 252 }
 253
 254 /* A TJH addition */
 255 int PEM_X509_INFO_write_bio(BIO *bp, const X509_INFO *xi, EVP_CIPHER *enc,
 256                             const unsigned char *kstr, int klen,
 257                             pem_password_cb *cb, void *u)
 258 {
 259     int i, ret = 0;
 260     unsigned char *data = NULL;
 261     const char *objstr = NULL;
 262     char buf[PEM_BUFSIZE];
 263     const unsigned char *iv = NULL;
 264
 265     if (enc != NULL) {
 266         objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
 267         if (objstr == NULL
 268                    /*
 269                     * Check "Proc-Type: 4,Encrypted\nDEK-Info: objstr,hex-iv\n"
 270                     * fits into buf
 271                     */
 272                 || (strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13)
 273                    > sizeof(buf)) {
 274             PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
 275             goto err;
 276         }
 277     }
 278
 279     /*
 280      * now for the fun part ... if we have a private key then we have to be
 281      * able to handle a not-yet-decrypted key being written out correctly ...
 282      * if it is decrypted or it is non-encrypted then we use the base code
 283      */
 284     if (xi->x_pkey != NULL) {
 285         if ((xi->enc_data != NULL) && (xi->enc_len > 0)) {
 286             if (enc == NULL) {
 287                 PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO, PEM_R_CIPHER_IS_NULL);
 288                 goto err;
 289             }
 290
 291             /* copy from weirdo names into more normal things */
 292             iv = xi->enc_cipher.iv;
 293             data = (unsigned char *)xi->enc_data;
 294             i = xi->enc_len;
 295
 296             /*
 297              * we take the encryption data from the internal stuff rather
 298              * than what the user has passed us ... as we have to match
 299              * exactly for some strange reason
 300              */
 301             objstr = OBJ_nid2sn(EVP_CIPHER_nid(xi->enc_cipher.cipher));
 302             if (objstr == NULL) {
 303                 PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO,
 304                        PEM_R_UNSUPPORTED_CIPHER);
 305                 goto err;
 306             }
 307
 308             /* Create the right magic header stuff */
 309             buf[0] = '\0';
 310             PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
 311             PEM_dek_info(buf, objstr, EVP_CIPHER_iv_length(enc),
 312                          (const char *)iv);
 313
 314             /* use the normal code to write things out */
 315             i = PEM_write_bio(bp, PEM_STRING_RSA, buf, data, i);
 316             if (i <= 0)
 317                 goto err;
 318         } else {
 319             /* Add DSA/DH */
 320 #ifndef OPENSSL_NO_RSA
 321             /* normal optionally encrypted stuff */
 322             if (PEM_write_bio_RSAPrivateKey(bp,
 323                                             EVP_PKEY_get0_RSA(xi->x_pkey->dec_pkey),
 324                                             enc, kstr, klen, cb, u) <= 0)
 325                 goto err;
 326 #endif
 327         }
 328     }
 329
 330     /* if we have a certificate then write it out now */
 331     if ((xi->x509 != NULL) && (PEM_write_bio_X509(bp, xi->x509) <= 0))
 332         goto err;
 333
 334     /*
 335      * we are ignoring anything else that is loaded into the X509_INFO
 336      * structure for the moment ... as I don't need it so I'm not coding it
 337      * here and Eric can do it when this makes it into the base library --tjh
 338      */
 339
 340     ret = 1;
 341
 342  err:
 343     OPENSSL_cleanse(buf, PEM_BUFSIZE);
 344     return ret;
 345 }