xref: /openssl/crypto/pkcs12/p12_npas.c (revision 940059d5)
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 
PKCS12_newpass(PKCS12 * p12,const char * oldpass,const char * newpass)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 
newpass_p12(PKCS12 * p12,const char * oldpass,const char * newpass)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 
newpass_bags(STACK_OF (PKCS12_SAFEBAG)* bags,const char * oldpass,const char * newpass,OSSL_LIB_CTX * libctx,const char * propq)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 
newpass_bag(PKCS12_SAFEBAG * bag,const char * oldpass,const char * newpass,OSSL_LIB_CTX * libctx,const char * propq)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 
alg_get(const X509_ALGOR * alg,int * pnid,int * piter,int * psaltlen,int * cipherid)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(NULL, &aparamtype, &aparam, pbe2->keyfunc);
216         X509_ALGOR_get0(&aoid, NULL, NULL, pbe2->encryption);
217         encnid = OBJ_obj2nid(aoid);
218 
219         if (aparamtype == V_ASN1_SEQUENCE)
220             kdf = ASN1_item_unpack(aparam, ASN1_ITEM_rptr(PBKDF2PARAM));
221         if (kdf == NULL)
222             goto done;
223 
224         /* Only OCTET_STRING is supported */
225         if (kdf->salt->type != V_ASN1_OCTET_STRING)
226             goto done;
227 
228         if (kdf->prf == NULL) {
229             prfnid = NID_hmacWithSHA1;
230         } else {
231             X509_ALGOR_get0(&aoid, NULL, NULL, kdf->prf);
232             prfnid = OBJ_obj2nid(aoid);
233         }
234         *psaltlen = kdf->salt->value.octet_string->length;
235         *piter = ASN1_INTEGER_get(kdf->iter);
236         *pnid = prfnid;
237         *cipherid = encnid;
238         break;
239     default:
240         pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), alg->parameter);
241         if (pbe == NULL)
242             goto done;
243         *pnid = OBJ_obj2nid(alg->algorithm);
244         *piter = ASN1_INTEGER_get(pbe->iter);
245         *psaltlen = pbe->salt->length;
246         *cipherid = NID_undef;
247         ret = 1;
248         break;
249     }
250     ret = 1;
251 done:
252     if (kdf != NULL)
253         PBKDF2PARAM_free(kdf);
254     if (pbe2 != NULL)
255         PBE2PARAM_free(pbe2);
256     if (pbe != NULL)
257         PBEPARAM_free(pbe);
258     return ret;
259 }
260