1 /* 2 * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (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 "internal/cryptlib.h" 12 #include <openssl/pkcs12.h> 13 14 /* Simplified PKCS#12 routines */ 15 16 static int parse_pk12(PKCS12 *p12, const char *pass, int passlen, 17 EVP_PKEY **pkey, STACK_OF(X509) *ocerts); 18 19 static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass, 20 int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts); 21 22 static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen, 23 EVP_PKEY **pkey, STACK_OF(X509) *ocerts); 24 25 /* 26 * Parse and decrypt a PKCS#12 structure returning user key, user cert and 27 * other (CA) certs. Note either ca should be NULL, *ca should be NULL, or it 28 * should point to a valid STACK structure. pkey and cert can be passed 29 * uninitialised. 30 */ 31 32 int PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert, 33 STACK_OF(X509) **ca) 34 { 35 STACK_OF(X509) *ocerts = NULL; 36 X509 *x = NULL; 37 38 if (pkey) 39 *pkey = NULL; 40 if (cert) 41 *cert = NULL; 42 43 /* Check for NULL PKCS12 structure */ 44 45 if (!p12) { 46 PKCS12err(PKCS12_F_PKCS12_PARSE, 47 PKCS12_R_INVALID_NULL_PKCS12_POINTER); 48 return 0; 49 } 50 51 /* Check the mac */ 52 53 /* 54 * If password is zero length or NULL then try verifying both cases to 55 * determine which password is correct. The reason for this is that under 56 * PKCS#12 password based encryption no password and a zero length 57 * password are two different things... 58 */ 59 60 if (!pass || !*pass) { 61 if (PKCS12_verify_mac(p12, NULL, 0)) 62 pass = NULL; 63 else if (PKCS12_verify_mac(p12, "", 0)) 64 pass = ""; 65 else { 66 PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE); 67 goto err; 68 } 69 } else if (!PKCS12_verify_mac(p12, pass, -1)) { 70 PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_MAC_VERIFY_FAILURE); 71 goto err; 72 } 73 74 /* Allocate stack for other certificates */ 75 ocerts = sk_X509_new_null(); 76 77 if (!ocerts) { 78 PKCS12err(PKCS12_F_PKCS12_PARSE, ERR_R_MALLOC_FAILURE); 79 goto err; 80 } 81 82 if (!parse_pk12(p12, pass, -1, pkey, ocerts)) { 83 PKCS12err(PKCS12_F_PKCS12_PARSE, PKCS12_R_PARSE_ERROR); 84 goto err; 85 } 86 87 while ((x = sk_X509_pop(ocerts))) { 88 if (pkey && *pkey && cert && !*cert) { 89 ERR_set_mark(); 90 if (X509_check_private_key(x, *pkey)) { 91 *cert = x; 92 x = NULL; 93 } 94 ERR_pop_to_mark(); 95 } 96 97 if (ca && x) { 98 if (!*ca) 99 *ca = sk_X509_new_null(); 100 if (!*ca) 101 goto err; 102 if (!sk_X509_push(*ca, x)) 103 goto err; 104 x = NULL; 105 } 106 X509_free(x); 107 } 108 109 sk_X509_pop_free(ocerts, X509_free); 110 111 return 1; 112 113 err: 114 115 if (pkey) { 116 EVP_PKEY_free(*pkey); 117 *pkey = NULL; 118 } 119 if (cert) { 120 X509_free(*cert); 121 *cert = NULL; 122 } 123 X509_free(x); 124 sk_X509_pop_free(ocerts, X509_free); 125 return 0; 126 127 } 128 129 /* Parse the outer PKCS#12 structure */ 130 131 static int parse_pk12(PKCS12 *p12, const char *pass, int passlen, 132 EVP_PKEY **pkey, STACK_OF(X509) *ocerts) 133 { 134 STACK_OF(PKCS7) *asafes; 135 STACK_OF(PKCS12_SAFEBAG) *bags; 136 int i, bagnid; 137 PKCS7 *p7; 138 139 if ((asafes = PKCS12_unpack_authsafes(p12)) == NULL) 140 return 0; 141 for (i = 0; i < sk_PKCS7_num(asafes); i++) { 142 p7 = sk_PKCS7_value(asafes, i); 143 bagnid = OBJ_obj2nid(p7->type); 144 if (bagnid == NID_pkcs7_data) { 145 bags = PKCS12_unpack_p7data(p7); 146 } else if (bagnid == NID_pkcs7_encrypted) { 147 bags = PKCS12_unpack_p7encdata(p7, pass, passlen); 148 } else 149 continue; 150 if (!bags) { 151 sk_PKCS7_pop_free(asafes, PKCS7_free); 152 return 0; 153 } 154 if (!parse_bags(bags, pass, passlen, pkey, ocerts)) { 155 sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free); 156 sk_PKCS7_pop_free(asafes, PKCS7_free); 157 return 0; 158 } 159 sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free); 160 } 161 sk_PKCS7_pop_free(asafes, PKCS7_free); 162 return 1; 163 } 164 165 static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass, 166 int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts) 167 { 168 int i; 169 for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) { 170 if (!parse_bag(sk_PKCS12_SAFEBAG_value(bags, i), 171 pass, passlen, pkey, ocerts)) 172 return 0; 173 } 174 return 1; 175 } 176 177 static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen, 178 EVP_PKEY **pkey, STACK_OF(X509) *ocerts) 179 { 180 PKCS8_PRIV_KEY_INFO *p8; 181 X509 *x509; 182 const ASN1_TYPE *attrib; 183 ASN1_BMPSTRING *fname = NULL; 184 ASN1_OCTET_STRING *lkid = NULL; 185 186 if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_friendlyName))) 187 fname = attrib->value.bmpstring; 188 189 if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_localKeyID))) 190 lkid = attrib->value.octet_string; 191 192 switch (PKCS12_SAFEBAG_get_nid(bag)) { 193 case NID_keyBag: 194 if (!pkey || *pkey) 195 return 1; 196 *pkey = EVP_PKCS82PKEY(PKCS12_SAFEBAG_get0_p8inf(bag)); 197 if (*pkey == NULL) 198 return 0; 199 break; 200 201 case NID_pkcs8ShroudedKeyBag: 202 if (!pkey || *pkey) 203 return 1; 204 if ((p8 = PKCS12_decrypt_skey(bag, pass, passlen)) == NULL) 205 return 0; 206 *pkey = EVP_PKCS82PKEY(p8); 207 PKCS8_PRIV_KEY_INFO_free(p8); 208 if (!(*pkey)) 209 return 0; 210 break; 211 212 case NID_certBag: 213 if (PKCS12_SAFEBAG_get_bag_nid(bag) != NID_x509Certificate) 214 return 1; 215 if ((x509 = PKCS12_SAFEBAG_get1_cert(bag)) == NULL) 216 return 0; 217 if (lkid && !X509_keyid_set1(x509, lkid->data, lkid->length)) { 218 X509_free(x509); 219 return 0; 220 } 221 if (fname) { 222 int len, r; 223 unsigned char *data; 224 len = ASN1_STRING_to_UTF8(&data, fname); 225 if (len >= 0) { 226 r = X509_alias_set1(x509, data, len); 227 OPENSSL_free(data); 228 if (!r) { 229 X509_free(x509); 230 return 0; 231 } 232 } 233 } 234 235 if (!sk_X509_push(ocerts, x509)) { 236 X509_free(x509); 237 return 0; 238 } 239 240 break; 241 242 case NID_safeContentsBag: 243 return parse_bags(PKCS12_SAFEBAG_get0_safes(bag), pass, passlen, pkey, 244 ocerts); 245 246 default: 247 return 1; 248 } 249 return 1; 250 } 251