1 /* 2 * Copyright 1995-2021 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 "internal/cryptlib.h" 12 #include <openssl/asn1t.h> 13 #include <openssl/x509.h> 14 #include "crypto/x509.h" 15 16 /*- 17 * X509_REQ_INFO is handled in an unusual way to get round 18 * invalid encodings. Some broken certificate requests don't 19 * encode the attributes field if it is empty. This is in 20 * violation of PKCS#10 but we need to tolerate it. We do 21 * this by making the attributes field OPTIONAL then using 22 * the callback to initialise it to an empty STACK. 23 * 24 * This means that the field will be correctly encoded unless 25 * we NULL out the field. 26 * 27 * As a result we no longer need the req_kludge field because 28 * the information is now contained in the attributes field: 29 * 1. If it is NULL then it's the invalid omission. 30 * 2. If it is empty it is the correct encoding. 31 * 3. If it is not empty then some attributes are present. 32 * 33 */ 34 35 static int rinf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 36 void *exarg) 37 { 38 X509_REQ_INFO *rinf = (X509_REQ_INFO *)*pval; 39 40 if (operation == ASN1_OP_NEW_POST) { 41 rinf->attributes = sk_X509_ATTRIBUTE_new_null(); 42 if (!rinf->attributes) 43 return 0; 44 } 45 return 1; 46 } 47 48 static int req_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 49 void *exarg) 50 { 51 X509_REQ *ret = (X509_REQ *)*pval; 52 53 switch (operation) { 54 case ASN1_OP_D2I_PRE: 55 ASN1_OCTET_STRING_free(ret->distinguishing_id); 56 /* fall thru */ 57 case ASN1_OP_NEW_POST: 58 ret->distinguishing_id = NULL; 59 break; 60 61 case ASN1_OP_FREE_POST: 62 ASN1_OCTET_STRING_free(ret->distinguishing_id); 63 OPENSSL_free(ret->propq); 64 break; 65 case ASN1_OP_DUP_POST: 66 { 67 X509_REQ *old = exarg; 68 69 if (!ossl_x509_req_set0_libctx(ret, old->libctx, old->propq)) 70 return 0; 71 if (old->req_info.pubkey != NULL) { 72 EVP_PKEY *pkey = X509_PUBKEY_get0(old->req_info.pubkey); 73 74 if (pkey != NULL) { 75 pkey = EVP_PKEY_dup(pkey); 76 if (pkey == NULL) { 77 ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE); 78 return 0; 79 } 80 if (!X509_PUBKEY_set(&ret->req_info.pubkey, pkey)) { 81 EVP_PKEY_free(pkey); 82 ERR_raise(ERR_LIB_X509, ERR_R_INTERNAL_ERROR); 83 return 0; 84 } 85 EVP_PKEY_free(pkey); 86 } 87 } 88 } 89 break; 90 case ASN1_OP_GET0_LIBCTX: 91 { 92 OSSL_LIB_CTX **libctx = exarg; 93 94 *libctx = ret->libctx; 95 } 96 break; 97 case ASN1_OP_GET0_PROPQ: 98 { 99 const char **propq = exarg; 100 101 *propq = ret->propq; 102 } 103 break; 104 } 105 106 return 1; 107 } 108 109 ASN1_SEQUENCE_enc(X509_REQ_INFO, enc, rinf_cb) = { 110 ASN1_SIMPLE(X509_REQ_INFO, version, ASN1_INTEGER), 111 ASN1_SIMPLE(X509_REQ_INFO, subject, X509_NAME), 112 ASN1_SIMPLE(X509_REQ_INFO, pubkey, X509_PUBKEY), 113 /* This isn't really OPTIONAL but it gets round invalid 114 * encodings 115 */ 116 ASN1_IMP_SET_OF_OPT(X509_REQ_INFO, attributes, X509_ATTRIBUTE, 0) 117 } ASN1_SEQUENCE_END_enc(X509_REQ_INFO, X509_REQ_INFO) 118 119 IMPLEMENT_ASN1_FUNCTIONS(X509_REQ_INFO) 120 121 ASN1_SEQUENCE_ref(X509_REQ, req_cb) = { 122 ASN1_EMBED(X509_REQ, req_info, X509_REQ_INFO), 123 ASN1_EMBED(X509_REQ, sig_alg, X509_ALGOR), 124 ASN1_SIMPLE(X509_REQ, signature, ASN1_BIT_STRING) 125 } ASN1_SEQUENCE_END_ref(X509_REQ, X509_REQ) 126 127 IMPLEMENT_ASN1_FUNCTIONS(X509_REQ) 128 129 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REQ) 130 131 void X509_REQ_set0_distinguishing_id(X509_REQ *x, ASN1_OCTET_STRING *d_id) 132 { 133 ASN1_OCTET_STRING_free(x->distinguishing_id); 134 x->distinguishing_id = d_id; 135 } 136 137 ASN1_OCTET_STRING *X509_REQ_get0_distinguishing_id(X509_REQ *x) 138 { 139 return x->distinguishing_id; 140 } 141 142 /* 143 * This should only be used if the X509_REQ object was embedded inside another 144 * asn1 object and it needs a libctx to operate. 145 * Use X509_REQ_new_ex() instead if possible. 146 */ 147 int ossl_x509_req_set0_libctx(X509_REQ *x, OSSL_LIB_CTX *libctx, 148 const char *propq) 149 { 150 if (x != NULL) { 151 x->libctx = libctx; 152 OPENSSL_free(x->propq); 153 x->propq = NULL; 154 if (propq != NULL) { 155 x->propq = OPENSSL_strdup(propq); 156 if (x->propq == NULL) 157 return 0; 158 } 159 } 160 return 1; 161 } 162 163 X509_REQ *X509_REQ_new_ex(OSSL_LIB_CTX *libctx, const char *propq) 164 { 165 X509_REQ *req = NULL; 166 167 req = (X509_REQ *)ASN1_item_new((X509_REQ_it())); 168 if (!ossl_x509_req_set0_libctx(req, libctx, propq)) { 169 X509_REQ_free(req); 170 req = NULL; 171 } 172 return req; 173 } 174