crypto/pkcs12/p12_npas.c

   1 /*
   2  * Copyright 1999-2020 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 #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 DEFINE_STACK_OF(PKCS7)
  19 DEFINE_STACK_OF(PKCS12_SAFEBAG)
  20
  21 /* PKCS#12 password change routine */
  22
  23 static int newpass_p12(PKCS12 *p12, const char *oldpass, const char *newpass);
  24 static int newpass_bags(STACK_OF(PKCS12_SAFEBAG) *bags, const char *oldpass,
  25                         const char *newpass);
  26 static int newpass_bag(PKCS12_SAFEBAG *bag, const char *oldpass,
  27                         const char *newpass);
  28 static int alg_get(const X509_ALGOR *alg, int *pnid, int *piter,
  29                    int *psaltlen);
  30
  31 /*
  32  * Change the password on a PKCS#12 structure.
  33  */
  34
  35 int PKCS12_newpass(PKCS12 *p12, const char *oldpass, const char *newpass)
  36 {
  37     /* Check for NULL PKCS12 structure */
  38
  39     if (p12 == NULL) {
  40         PKCS12err(PKCS12_F_PKCS12_NEWPASS,
  41                   PKCS12_R_INVALID_NULL_PKCS12_POINTER);
  42         return 0;
  43     }
  44
  45     /* Check the mac */
  46
  47     if (!PKCS12_verify_mac(p12, oldpass, -1)) {
  48         PKCS12err(PKCS12_F_PKCS12_NEWPASS, PKCS12_R_MAC_VERIFY_FAILURE);
  49         return 0;
  50     }
  51
  52     if (!newpass_p12(p12, oldpass, newpass)) {
  53         PKCS12err(PKCS12_F_PKCS12_NEWPASS, PKCS12_R_PARSE_ERROR);
  54         return 0;
  55     }
  56
  57     return 1;
  58 }
  59
  60 /* Parse the outer PKCS#12 structure */
  61
  62 static int newpass_p12(PKCS12 *p12, const char *oldpass, const char *newpass)
  63 {
  64     STACK_OF(PKCS7) *asafes = NULL, *newsafes = NULL;
  65     STACK_OF(PKCS12_SAFEBAG) *bags = NULL;
  66     int i, bagnid, pbe_nid = 0, pbe_iter = 0, pbe_saltlen = 0;
  67     PKCS7 *p7, *p7new;
  68     ASN1_OCTET_STRING *p12_data_tmp = NULL, *macoct = NULL;
  69     unsigned char mac[EVP_MAX_MD_SIZE];
  70     unsigned int maclen;
  71     int rv = 0;
  72
  73     if ((asafes = PKCS12_unpack_authsafes(p12)) == NULL)
  74         goto err;
  75     if ((newsafes = sk_PKCS7_new_null()) == NULL)
  76         goto err;
  77     for (i = 0; i < sk_PKCS7_num(asafes); i++) {
  78         p7 = sk_PKCS7_value(asafes, i);
  79         bagnid = OBJ_obj2nid(p7->type);
  80         if (bagnid == NID_pkcs7_data) {
  81             bags = PKCS12_unpack_p7data(p7);
  82         } else if (bagnid == NID_pkcs7_encrypted) {
  83             bags = PKCS12_unpack_p7encdata(p7, oldpass, -1);
  84             if (!alg_get(p7->d.encrypted->enc_data->algorithm,
  85                          &pbe_nid, &pbe_iter, &pbe_saltlen))
  86                 goto err;
  87         } else {
  88             continue;
  89         }
  90         if (bags == NULL)
  91             goto err;
  92         if (!newpass_bags(bags, oldpass, newpass))
  93             goto err;
  94         /* Repack bag in same form with new password */
  95         if (bagnid == NID_pkcs7_data)
  96             p7new = PKCS12_pack_p7data(bags);
  97         else
  98             p7new = PKCS12_pack_p7encdata(pbe_nid, newpass, -1, NULL,
  99                                           pbe_saltlen, pbe_iter, bags);
 100         if (p7new == NULL || !sk_PKCS7_push(newsafes, p7new))
 101             goto err;
 102         sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
 103         bags = NULL;
 104     }
 105
 106     /* Repack safe: save old safe in case of error */
 107
 108     p12_data_tmp = p12->authsafes->d.data;
 109     if ((p12->authsafes->d.data = ASN1_OCTET_STRING_new()) == NULL)
 110         goto err;
 111     if (!PKCS12_pack_authsafes(p12, newsafes))
 112         goto err;
 113
 114     if (!PKCS12_gen_mac(p12, newpass, -1, mac, &maclen))
 115         goto err;
 116     X509_SIG_getm(p12->mac->dinfo, NULL, &macoct);
 117     if (!ASN1_OCTET_STRING_set(macoct, mac, maclen))
 118         goto err;
 119
 120     rv = 1;
 121
 122 err:
 123     /* Restore old safe if necessary */
 124     if (rv == 1) {
 125         ASN1_OCTET_STRING_free(p12_data_tmp);
 126     } else if (p12_data_tmp != NULL) {
 127         ASN1_OCTET_STRING_free(p12->authsafes->d.data);
 128         p12->authsafes->d.data = p12_data_tmp;
 129     }
 130     sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
 131     sk_PKCS7_pop_free(asafes, PKCS7_free);
 132     sk_PKCS7_pop_free(newsafes, PKCS7_free);
 133     return rv;
 134 }
 135
 136 static int newpass_bags(STACK_OF(PKCS12_SAFEBAG) *bags, const char *oldpass,
 137                         const char *newpass)
 138 {
 139     int i;
 140     for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
 141         if (!newpass_bag(sk_PKCS12_SAFEBAG_value(bags, i), oldpass, newpass))
 142             return 0;
 143     }
 144     return 1;
 145 }
 146
 147 /* Change password of safebag: only needs handle shrouded keybags */
 148
 149 static int newpass_bag(PKCS12_SAFEBAG *bag, const char *oldpass,
 150                        const char *newpass)
 151 {
 152     PKCS8_PRIV_KEY_INFO *p8;
 153     X509_SIG *p8new;
 154     int p8_nid, p8_saltlen, p8_iter;
 155     const X509_ALGOR *shalg;
 156
 157     if (PKCS12_SAFEBAG_get_nid(bag) != NID_pkcs8ShroudedKeyBag)
 158         return 1;
 159
 160     if ((p8 = PKCS8_decrypt(bag->value.shkeybag, oldpass, -1)) == NULL)
 161         return 0;
 162     X509_SIG_get0(bag->value.shkeybag, &shalg, NULL);
 163     if (!alg_get(shalg, &p8_nid, &p8_iter, &p8_saltlen))
 164         return 0;
 165     p8new = PKCS8_encrypt(p8_nid, NULL, newpass, -1, NULL, p8_saltlen,
 166                           p8_iter, p8);
 167     PKCS8_PRIV_KEY_INFO_free(p8);
 168     if (p8new == NULL)
 169         return 0;
 170     X509_SIG_free(bag->value.shkeybag);
 171     bag->value.shkeybag = p8new;
 172     return 1;
 173 }
 174
 175 static int alg_get(const X509_ALGOR *alg, int *pnid, int *piter,
 176                    int *psaltlen)
 177 {
 178     PBEPARAM *pbe;
 179
 180     pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), alg->parameter);
 181     if (pbe == NULL)
 182         return 0;
 183     *pnid = OBJ_obj2nid(alg->algorithm);
 184     *piter = ASN1_INTEGER_get(pbe->iter);
 185     *psaltlen = pbe->salt->length;
 186     PBEPARAM_free(pbe);
 187     return 1;
 188 }