crypto/pkcs12/p12_npas.c

   1 /*
   2  * Copyright 1999-2024 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 <stdlib.h>
  12 #include <string.h>
  13 #include <openssl/pem.h>
  14 #include <openssl/err.h>
  15 #include <openssl/pkcs12.h>
  16 #include "p12_local.h"
  17
  18 /* PKCS#12 password change routine */
  19
  20 static int newpass_p12(PKCS12 *p12, const char *oldpass, const char *newpass);
  21 static int newpass_bags(STACK_OF(PKCS12_SAFEBAG) *bags, const char *oldpass,
  22                         const char *newpass,
  23                         OSSL_LIB_CTX *libctx, const char *propq);
  24 static int newpass_bag(PKCS12_SAFEBAG *bag, const char *oldpass,
  25                         const char *newpass,
  26                         OSSL_LIB_CTX *libctx, const char *propq);
  27 static int alg_get(const X509_ALGOR *alg, int *pnid, int *piter,
  28                    int *psaltlen, int *cipherid);
  29
  30 /*
  31  * Change the password on a PKCS#12 structure.
  32  */
  33
  34 int PKCS12_newpass(PKCS12 *p12, const char *oldpass, const char *newpass)
  35 {
  36     /* Check for NULL PKCS12 structure */
  37
  38     if (p12 == NULL) {
  39         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_INVALID_NULL_PKCS12_POINTER);
  40         return 0;
  41     }
  42
  43     /* Check the mac */
  44     if (p12->mac != NULL) {
  45         if (!PKCS12_verify_mac(p12, oldpass, -1)) {
  46             ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_VERIFY_FAILURE);
  47             return 0;
  48         }
  49     }
  50     if (!newpass_p12(p12, oldpass, newpass)) {
  51         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_PARSE_ERROR);
  52         return 0;
  53     }
  54
  55     return 1;
  56 }
  57
  58 /* Parse the outer PKCS#12 structure */
  59
  60 static int newpass_p12(PKCS12 *p12, const char *oldpass, const char *newpass)
  61 {
  62     STACK_OF(PKCS7) *asafes = NULL, *newsafes = NULL;
  63     STACK_OF(PKCS12_SAFEBAG) *bags = NULL;
  64     int i, bagnid, pbe_nid = 0, pbe_iter = 0, pbe_saltlen = 0, cipherid = NID_undef;
  65     PKCS7 *p7, *p7new;
  66     ASN1_OCTET_STRING *p12_data_tmp = NULL, *macoct = NULL;
  67     unsigned char mac[EVP_MAX_MD_SIZE];
  68     unsigned int maclen;
  69     int rv = 0;
  70
  71     if ((asafes = PKCS12_unpack_authsafes(p12)) == NULL)
  72         goto err;
  73     if ((newsafes = sk_PKCS7_new_null()) == NULL)
  74         goto err;
  75     for (i = 0; i < sk_PKCS7_num(asafes); i++) {
  76         p7 = sk_PKCS7_value(asafes, i);
  77
  78         bagnid = OBJ_obj2nid(p7->type);
  79         if (bagnid == NID_pkcs7_data) {
  80             bags = PKCS12_unpack_p7data(p7);
  81         } else if (bagnid == NID_pkcs7_encrypted) {
  82             bags = PKCS12_unpack_p7encdata(p7, oldpass, -1);
  83             if (p7->d.encrypted == NULL
  84                     || !alg_get(p7->d.encrypted->enc_data->algorithm,
  85                                 &pbe_nid, &pbe_iter, &pbe_saltlen, &cipherid))
  86                 goto err;
  87         } else {
  88             continue;
  89         }
  90         if (bags == NULL)
  91             goto err;
  92         if (!newpass_bags(bags, oldpass, newpass,
  93                           p7->ctx.libctx, p7->ctx.propq))
  94             goto err;
  95         /* Repack bag in same form with new password */
  96         if (bagnid == NID_pkcs7_data)
  97             p7new = PKCS12_pack_p7data(bags);
  98         else
  99             p7new = PKCS12_pack_p7encdata_ex(pbe_nid, newpass, -1, NULL,
 100                                              pbe_saltlen, pbe_iter, bags,
 101                                              p7->ctx.libctx, p7->ctx.propq);
 102         if (p7new == NULL || !sk_PKCS7_push(newsafes, p7new))
 103             goto err;
 104         sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
 105         bags = NULL;
 106     }
 107
 108     /* Repack safe: save old safe in case of error */
 109
 110     p12_data_tmp = p12->authsafes->d.data;
 111     if ((p12->authsafes->d.data = ASN1_OCTET_STRING_new()) == NULL)
 112         goto err;
 113     if (!PKCS12_pack_authsafes(p12, newsafes))
 114         goto err;
 115
 116     if (p12->mac != NULL) {
 117         if (!PKCS12_gen_mac(p12, newpass, -1, mac, &maclen))
 118             goto err;
 119         X509_SIG_getm(p12->mac->dinfo, NULL, &macoct);
 120         if (!ASN1_OCTET_STRING_set(macoct, mac, maclen))
 121             goto err;
 122     }
 123
 124     rv = 1;
 125
 126 err:
 127     /* Restore old safe if necessary */
 128     if (rv == 1) {
 129         ASN1_OCTET_STRING_free(p12_data_tmp);
 130     } else if (p12_data_tmp != NULL) {
 131         ASN1_OCTET_STRING_free(p12->authsafes->d.data);
 132         p12->authsafes->d.data = p12_data_tmp;
 133     }
 134     sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
 135     sk_PKCS7_pop_free(asafes, PKCS7_free);
 136     sk_PKCS7_pop_free(newsafes, PKCS7_free);
 137     return rv;
 138 }
 139
 140 static int newpass_bags(STACK_OF(PKCS12_SAFEBAG) *bags, const char *oldpass,
 141                         const char *newpass,
 142                         OSSL_LIB_CTX *libctx, const char *propq)
 143 {
 144     int i;
 145     for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
 146         if (!newpass_bag(sk_PKCS12_SAFEBAG_value(bags, i), oldpass, newpass,
 147                          libctx, propq))
 148             return 0;
 149     }
 150     return 1;
 151 }
 152
 153 /* Change password of safebag: only needs handle shrouded keybags */
 154
 155 static int newpass_bag(PKCS12_SAFEBAG *bag, const char *oldpass,
 156                        const char *newpass,
 157                        OSSL_LIB_CTX *libctx, const char *propq)
 158 {
 159     EVP_CIPHER *cipher = NULL;
 160     PKCS8_PRIV_KEY_INFO *p8;
 161     X509_SIG *p8new;
 162     int p8_nid, p8_saltlen, p8_iter, cipherid = 0;
 163     const X509_ALGOR *shalg;
 164
 165     if (PKCS12_SAFEBAG_get_nid(bag) != NID_pkcs8ShroudedKeyBag)
 166         return 1;
 167
 168     if ((p8 = PKCS8_decrypt_ex(bag->value.shkeybag, oldpass, -1,
 169                                libctx, propq)) == NULL)
 170         return 0;
 171     X509_SIG_get0(bag->value.shkeybag, &shalg, NULL);
 172     if (!alg_get(shalg, &p8_nid, &p8_iter, &p8_saltlen, &cipherid)) {
 173         PKCS8_PRIV_KEY_INFO_free(p8);
 174         return 0;
 175     }
 176     if (cipherid != NID_undef) {
 177         cipher = EVP_CIPHER_fetch(libctx, OBJ_nid2sn(cipherid), propq);
 178         if (cipher == NULL) {
 179             PKCS8_PRIV_KEY_INFO_free(p8);
 180             return 0;
 181         }
 182     }
 183     p8new = PKCS8_encrypt_ex(p8_nid, cipher, newpass, -1, NULL, p8_saltlen,
 184                              p8_iter, p8, libctx, propq);
 185     PKCS8_PRIV_KEY_INFO_free(p8);
 186     EVP_CIPHER_free(cipher);
 187     if (p8new == NULL)
 188         return 0;
 189     X509_SIG_free(bag->value.shkeybag);
 190     bag->value.shkeybag = p8new;
 191     return 1;
 192 }
 193
 194 static int alg_get(const X509_ALGOR *alg, int *pnid, int *piter,
 195                    int *psaltlen, int *cipherid)
 196 {
 197     int ret = 0, pbenid, aparamtype;
 198     int encnid, prfnid;
 199     const ASN1_OBJECT *aoid;
 200     const void *aparam;
 201     PBEPARAM *pbe = NULL;
 202     PBE2PARAM *pbe2 = NULL;
 203     PBKDF2PARAM *kdf = NULL;
 204
 205     X509_ALGOR_get0(&aoid, &aparamtype, &aparam, alg);
 206     pbenid = OBJ_obj2nid(aoid);
 207
 208     switch (pbenid) {
 209     case NID_pbes2:
 210         if (aparamtype == V_ASN1_SEQUENCE)
 211             pbe2 = ASN1_item_unpack(aparam, ASN1_ITEM_rptr(PBE2PARAM));
 212         if (pbe2 == NULL)
 213             goto done;
 214
 215         X509_ALGOR_get0(&aoid, &aparamtype, &aparam, pbe2->keyfunc);
 216         pbenid = OBJ_obj2nid(aoid);
 217         X509_ALGOR_get0(&aoid, NULL, NULL, pbe2->encryption);
 218         encnid = OBJ_obj2nid(aoid);
 219
 220         if (aparamtype == V_ASN1_SEQUENCE)
 221             kdf = ASN1_item_unpack(aparam, ASN1_ITEM_rptr(PBKDF2PARAM));
 222         if (kdf == NULL)
 223             goto done;
 224
 225         /* Only OCTET_STRING is supported */
 226         if (kdf->salt->type != V_ASN1_OCTET_STRING)
 227             goto done;
 228
 229         if (kdf->prf == NULL) {
 230             prfnid = NID_hmacWithSHA1;
 231         } else {
 232             X509_ALGOR_get0(&aoid, NULL, NULL, kdf->prf);
 233             prfnid = OBJ_obj2nid(aoid);
 234         }
 235         *psaltlen = kdf->salt->value.octet_string->length;
 236         *piter = ASN1_INTEGER_get(kdf->iter);
 237         *pnid = prfnid;
 238         *cipherid = encnid;
 239         break;
 240     default:
 241         pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), alg->parameter);
 242         if (pbe == NULL)
 243             goto done;
 244         *pnid = OBJ_obj2nid(alg->algorithm);
 245         *piter = ASN1_INTEGER_get(pbe->iter);
 246         *psaltlen = pbe->salt->length;
 247         *cipherid = NID_undef;
 248         ret = 1;
 249         break;
 250     }
 251     ret = 1;
 252 done:
 253     if (kdf != NULL)
 254         PBKDF2PARAM_free(kdf);
 255     if (pbe2 != NULL)
 256         PBE2PARAM_free(pbe2);
 257     if (pbe != NULL)
 258         PBEPARAM_free(pbe);
 259     return ret;
 260 }