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 #ifndef OPENSSL_NO_STDIO
  27 STACK_OF(X509_INFO)
  28 *PEM_X509_INFO_read_ex(FILE *fp, STACK_OF(X509_INFO) *sk, pem_password_cb *cb,
  29                        void *u, OSSL_LIB_CTX *libctx, const char *propq)
  30 {
  31     BIO *b;
  32     STACK_OF(X509_INFO) *ret;
  33
  34     if ((b = BIO_new(BIO_s_file())) == NULL) {
  35         PEMerr(0, ERR_R_BUF_LIB);
  36         return 0;
  37     }
  38     BIO_set_fp(b, fp, BIO_NOCLOSE);
  39     ret = PEM_X509_INFO_read_bio_ex(b, sk, cb, u, libctx, propq);
  40     BIO_free(b);
  41     return ret;
  42 }
  43
  44 STACK_OF(X509_INFO) *PEM_X509_INFO_read(FILE *fp, STACK_OF(X509_INFO) *sk,
  45                                         pem_password_cb *cb, void *u)
  46 {
  47     return PEM_X509_INFO_read_ex(fp, sk, cb, u, NULL, NULL);
  48 }
  49 #endif
  50
  51 STACK_OF(X509_INFO)
  52 *PEM_X509_INFO_read_bio_ex(BIO *bp, STACK_OF(X509_INFO) *sk,
  53                            pem_password_cb *cb, void *u, OSSL_LIB_CTX *libctx,
  54                            const char *propq)
  55 {
  56     X509_INFO *xi = NULL;
  57     char *name = NULL, *header = NULL;
  58     void *pp;
  59     unsigned char *data = NULL;
  60     const unsigned char *p;
  61     long len, error = 0;
  62     int ok = 0;
  63     STACK_OF(X509_INFO) *ret = NULL;
  64     unsigned int i, raw, ptype;
  65     d2i_of_void *d2i = 0;
  66
  67     if (sk == NULL) {
  68         if ((ret = sk_X509_INFO_new_null()) == NULL) {
  69             PEMerr(0, ERR_R_MALLOC_FAILURE);
  70             goto err;
  71         }
  72     } else
  73         ret = sk;
  74
  75     if ((xi = X509_INFO_new()) == NULL)
  76         goto err;
  77     for (;;) {
  78         raw = 0;
  79         ptype = 0;
  80         i = PEM_read_bio(bp, &name, &header, &data, &len);
  81         if (i == 0) {
  82             error = ERR_GET_REASON(ERR_peek_last_error());
  83             if (error == PEM_R_NO_START_LINE) {
  84                 ERR_clear_error();
  85                 break;
  86             }
  87             goto err;
  88         }
  89  start:
  90         if ((strcmp(name, PEM_STRING_X509) == 0) ||
  91             (strcmp(name, PEM_STRING_X509_OLD) == 0)) {
  92             d2i = (D2I_OF(void)) d2i_X509;
  93             if (xi->x509 != NULL) {
  94                 if (!sk_X509_INFO_push(ret, xi))
  95                     goto err;
  96                 if ((xi = X509_INFO_new()) == NULL)
  97                     goto err;
  98                 goto start;
  99             }
 100             xi->x509 = X509_new_ex(libctx, propq);
 101             if (xi->x509 == NULL)
 102                 goto err;
 103             pp = &(xi->x509);
 104         } else if ((strcmp(name, PEM_STRING_X509_TRUSTED) == 0)) {
 105             d2i = (D2I_OF(void)) d2i_X509_AUX;
 106             if (xi->x509 != 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             xi->x509 = X509_new_ex(libctx, propq);
 114             if (xi->x509 == NULL)
 115                 goto err;
 116             pp = &(xi->x509);
 117         } else if (strcmp(name, PEM_STRING_X509_CRL) == 0) {
 118             d2i = (D2I_OF(void)) d2i_X509_CRL;
 119             if (xi->crl != NULL) {
 120                 if (!sk_X509_INFO_push(ret, xi))
 121                     goto err;
 122                 if ((xi = X509_INFO_new()) == NULL)
 123                     goto err;
 124                 goto start;
 125             }
 126             pp = &(xi->crl);
 127         } else
 128 #ifndef OPENSSL_NO_RSA
 129         if (strcmp(name, PEM_STRING_RSA) == 0) {
 130             d2i = (D2I_OF(void)) d2i_RSAPrivateKey;
 131             if (xi->x_pkey != NULL) {
 132                 if (!sk_X509_INFO_push(ret, xi))
 133                     goto err;
 134                 if ((xi = X509_INFO_new()) == NULL)
 135                     goto err;
 136                 goto start;
 137             }
 138
 139             xi->enc_data = NULL;
 140             xi->enc_len = 0;
 141
 142             xi->x_pkey = X509_PKEY_new();
 143             if (xi->x_pkey == NULL)
 144                 goto err;
 145             ptype = EVP_PKEY_RSA;
 146             pp = &xi->x_pkey->dec_pkey;
 147             if ((int)strlen(header) > 10) /* assume encrypted */
 148                 raw = 1;
 149         } else
 150 #endif
 151 #ifndef OPENSSL_NO_DSA
 152         if (strcmp(name, PEM_STRING_DSA) == 0) {
 153             d2i = (D2I_OF(void)) d2i_DSAPrivateKey;
 154             if (xi->x_pkey != NULL) {
 155                 if (!sk_X509_INFO_push(ret, xi))
 156                     goto err;
 157                 if ((xi = X509_INFO_new()) == NULL)
 158                     goto err;
 159                 goto start;
 160             }
 161
 162             xi->enc_data = NULL;
 163             xi->enc_len = 0;
 164
 165             xi->x_pkey = X509_PKEY_new();
 166             if (xi->x_pkey == NULL)
 167                 goto err;
 168             ptype = EVP_PKEY_DSA;
 169             pp = &xi->x_pkey->dec_pkey;
 170             if ((int)strlen(header) > 10) /* assume encrypted */
 171                 raw = 1;
 172         } else
 173 #endif
 174 #ifndef OPENSSL_NO_EC
 175         if (strcmp(name, PEM_STRING_ECPRIVATEKEY) == 0) {
 176             d2i = (D2I_OF(void)) d2i_ECPrivateKey;
 177             if (xi->x_pkey != NULL) {
 178                 if (!sk_X509_INFO_push(ret, xi))
 179                     goto err;
 180                 if ((xi = X509_INFO_new()) == NULL)
 181                     goto err;
 182                 goto start;
 183             }
 184
 185             xi->enc_data = NULL;
 186             xi->enc_len = 0;
 187
 188             xi->x_pkey = X509_PKEY_new();
 189             if (xi->x_pkey == NULL)
 190                 goto err;
 191             ptype = EVP_PKEY_EC;
 192             pp = &xi->x_pkey->dec_pkey;
 193             if ((int)strlen(header) > 10) /* assume encrypted */
 194                 raw = 1;
 195         } else
 196 #endif
 197         {
 198             d2i = NULL;
 199             pp = NULL;
 200         }
 201
 202         if (d2i != NULL) {
 203             if (!raw) {
 204                 EVP_CIPHER_INFO cipher;
 205
 206                 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
 207                     goto err;
 208                 if (!PEM_do_header(&cipher, data, &len, cb, u))
 209                     goto err;
 210                 p = data;
 211                 if (ptype) {
 212                     if (!d2i_PrivateKey(ptype, pp, &p, len)) {
 213                         PEMerr(0, ERR_R_ASN1_LIB);
 214                         goto err;
 215                     }
 216                 } else if (d2i(pp, &p, len) == NULL) {
 217                     PEMerr(0, ERR_R_ASN1_LIB);
 218                     goto err;
 219                 }
 220             } else {            /* encrypted RSA data */
 221                 if (!PEM_get_EVP_CIPHER_INFO(header, &xi->enc_cipher))
 222                     goto err;
 223                 xi->enc_data = (char *)data;
 224                 xi->enc_len = (int)len;
 225                 data = NULL;
 226             }
 227         } else {
 228             /* unknown */
 229         }
 230         OPENSSL_free(name);
 231         name = NULL;
 232         OPENSSL_free(header);
 233         header = NULL;
 234         OPENSSL_free(data);
 235         data = NULL;
 236     }
 237
 238     /*
 239      * if the last one hasn't been pushed yet and there is anything in it
 240      * then add it to the stack ...
 241      */
 242     if ((xi->x509 != NULL) || (xi->crl != NULL) ||
 243         (xi->x_pkey != NULL) || (xi->enc_data != NULL)) {
 244         if (!sk_X509_INFO_push(ret, xi))
 245             goto err;
 246         xi = NULL;
 247     }
 248     ok = 1;
 249  err:
 250     X509_INFO_free(xi);
 251     if (!ok) {
 252         for (i = 0; ((int)i) < sk_X509_INFO_num(ret); i++) {
 253             xi = sk_X509_INFO_value(ret, i);
 254             X509_INFO_free(xi);
 255         }
 256         if (ret != sk)
 257             sk_X509_INFO_free(ret);
 258         ret = NULL;
 259     }
 260
 261     OPENSSL_free(name);
 262     OPENSSL_free(header);
 263     OPENSSL_free(data);
 264     return ret;
 265 }
 266
 267 STACK_OF(X509_INFO) *PEM_X509_INFO_read_bio(BIO *bp, STACK_OF(X509_INFO) *sk,
 268                                             pem_password_cb *cb, void *u)
 269 {
 270     return PEM_X509_INFO_read_bio_ex(bp, sk, cb, u, NULL, NULL);
 271 }
 272
 273 /* A TJH addition */
 274 int PEM_X509_INFO_write_bio(BIO *bp, const X509_INFO *xi, EVP_CIPHER *enc,
 275                             const unsigned char *kstr, int klen,
 276                             pem_password_cb *cb, void *u)
 277 {
 278     int i, ret = 0;
 279     unsigned char *data = NULL;
 280     const char *objstr = NULL;
 281     char buf[PEM_BUFSIZE];
 282     const unsigned char *iv = NULL;
 283
 284     if (enc != NULL) {
 285         objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
 286         if (objstr == NULL
 287                    /*
 288                     * Check "Proc-Type: 4,Encrypted\nDEK-Info: objstr,hex-iv\n"
 289                     * fits into buf
 290                     */
 291                 || (strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13)
 292                    > sizeof(buf)) {
 293             PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
 294             goto err;
 295         }
 296     }
 297
 298     /*
 299      * now for the fun part ... if we have a private key then we have to be
 300      * able to handle a not-yet-decrypted key being written out correctly ...
 301      * if it is decrypted or it is non-encrypted then we use the base code
 302      */
 303     if (xi->x_pkey != NULL) {
 304         if ((xi->enc_data != NULL) && (xi->enc_len > 0)) {
 305             if (enc == NULL) {
 306                 PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO, PEM_R_CIPHER_IS_NULL);
 307                 goto err;
 308             }
 309
 310             /* copy from weirdo names into more normal things */
 311             iv = xi->enc_cipher.iv;
 312             data = (unsigned char *)xi->enc_data;
 313             i = xi->enc_len;
 314
 315             /*
 316              * we take the encryption data from the internal stuff rather
 317              * than what the user has passed us ... as we have to match
 318              * exactly for some strange reason
 319              */
 320             objstr = OBJ_nid2sn(EVP_CIPHER_nid(xi->enc_cipher.cipher));
 321             if (objstr == NULL) {
 322                 PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO,
 323                        PEM_R_UNSUPPORTED_CIPHER);
 324                 goto err;
 325             }
 326
 327             /* Create the right magic header stuff */
 328             buf[0] = '\0';
 329             PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
 330             PEM_dek_info(buf, objstr, EVP_CIPHER_iv_length(enc),
 331                          (const char *)iv);
 332
 333             /* use the normal code to write things out */
 334             i = PEM_write_bio(bp, PEM_STRING_RSA, buf, data, i);
 335             if (i <= 0)
 336                 goto err;
 337         } else {
 338             /* Add DSA/DH */
 339 #ifndef OPENSSL_NO_RSA
 340             /* normal optionally encrypted stuff */
 341             if (PEM_write_bio_RSAPrivateKey(bp,
 342                                             EVP_PKEY_get0_RSA(xi->x_pkey->dec_pkey),
 343                                             enc, kstr, klen, cb, u) <= 0)
 344                 goto err;
 345 #endif
 346         }
 347     }
 348
 349     /* if we have a certificate then write it out now */
 350     if ((xi->x509 != NULL) && (PEM_write_bio_X509(bp, xi->x509) <= 0))
 351         goto err;
 352
 353     /*
 354      * we are ignoring anything else that is loaded into the X509_INFO
 355      * structure for the moment ... as I don't need it so I'm not coding it
 356      * here and Eric can do it when this makes it into the base library --tjh
 357      */
 358
 359     ret = 1;
 360
 361  err:
 362     OPENSSL_cleanse(buf, PEM_BUFSIZE);
 363     return ret;
 364 }