annotate nss/lib/pk11wrap/pk11kea.c @ 4:b513267f632f tip

Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* This Source Code Form is subject to the terms of the Mozilla Public
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2 * License, v. 2.0. If a copy of the MPL was not distributed with this
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3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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4 /*
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5 * This file implements the Symkey wrapper and the PKCS context
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6 * Interfaces.
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7 */
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8
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9 #include "seccomon.h"
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10 #include "secmod.h"
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11 #include "nssilock.h"
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12 #include "secmodi.h"
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13 #include "secmodti.h"
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14 #include "pkcs11.h"
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15 #include "pk11func.h"
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16 #include "secitem.h"
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17 #include "key.h"
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18 #include "secasn1.h"
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19 #include "sechash.h"
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20 #include "cert.h"
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21 #include "secerr.h"
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22
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23 /*
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24 * find an RSA public key on a card
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25 */
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26 static CK_OBJECT_HANDLE
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27 pk11_FindRSAPubKey(PK11SlotInfo *slot)
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28 {
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29 CK_KEY_TYPE key_type = CKK_RSA;
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30 CK_OBJECT_CLASS class_type = CKO_PUBLIC_KEY;
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31 CK_ATTRIBUTE theTemplate[2];
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32 int template_count = sizeof(theTemplate)/sizeof(theTemplate[0]);
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33 CK_ATTRIBUTE *attrs = theTemplate;
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34
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35 PK11_SETATTRS(attrs,CKA_CLASS,&class_type,sizeof(class_type)); attrs++;
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36 PK11_SETATTRS(attrs,CKA_KEY_TYPE,&key_type,sizeof(key_type)); attrs++;
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37 template_count = attrs - theTemplate;
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38 PR_ASSERT(template_count <= sizeof(theTemplate)/sizeof(CK_ATTRIBUTE));
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39
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40 return pk11_FindObjectByTemplate(slot,theTemplate,template_count);
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41 }
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42
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43 PK11SymKey *
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44 pk11_KeyExchange(PK11SlotInfo *slot,CK_MECHANISM_TYPE type,
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45 CK_ATTRIBUTE_TYPE operation, CK_FLAGS flags,
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46 PRBool isPerm, PK11SymKey *symKey)
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47 {
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48 PK11SymKey *newSymKey = NULL;
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49 SECStatus rv;
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50 /* performance improvement can go here --- use a generated key at startup
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51 * to generate a per token wrapping key. If it exists, use it, otherwise
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52 * do a full key exchange. */
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53
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54 /* find a common Key Exchange algorithm */
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55 /* RSA */
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56 if (PK11_DoesMechanism(symKey->slot, CKM_RSA_PKCS) &&
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57 PK11_DoesMechanism(slot,CKM_RSA_PKCS)) {
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58 CK_OBJECT_HANDLE pubKeyHandle = CK_INVALID_HANDLE;
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59 CK_OBJECT_HANDLE privKeyHandle = CK_INVALID_HANDLE;
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60 SECKEYPublicKey *pubKey = NULL;
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61 SECKEYPrivateKey *privKey = NULL;
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62 SECItem wrapData;
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63 unsigned int symKeyLength = PK11_GetKeyLength(symKey);
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64
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65 wrapData.data = NULL;
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66
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67 /* find RSA Public Key on target */
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68 pubKeyHandle = pk11_FindRSAPubKey(slot);
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69 if (pubKeyHandle != CK_INVALID_HANDLE) {
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70 privKeyHandle = PK11_MatchItem(slot,pubKeyHandle,CKO_PRIVATE_KEY);
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71 }
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72
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73 /* if no key exists, generate a key pair */
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74 if (privKeyHandle == CK_INVALID_HANDLE) {
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75 PK11RSAGenParams rsaParams;
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76
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77 if (symKeyLength > 53) /* bytes */ {
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78 /* we'd have to generate an RSA key pair > 512 bits long,
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79 ** and that's too costly. Don't even try.
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80 */
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81 PORT_SetError( SEC_ERROR_CANNOT_MOVE_SENSITIVE_KEY );
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82 goto rsa_failed;
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83 }
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84 rsaParams.keySizeInBits =
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85 (symKeyLength > 21 || symKeyLength == 0) ? 512 : 256;
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86 rsaParams.pe = 0x10001;
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87 privKey = PK11_GenerateKeyPair(slot,CKM_RSA_PKCS_KEY_PAIR_GEN,
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88 &rsaParams, &pubKey,PR_FALSE,PR_TRUE,symKey->cx);
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89 } else {
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90 /* if keys exist, build SECKEY data structures for them */
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91 privKey = PK11_MakePrivKey(slot,nullKey, PR_TRUE, privKeyHandle,
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92 symKey->cx);
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93 if (privKey != NULL) {
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94 pubKey = PK11_ExtractPublicKey(slot, rsaKey, pubKeyHandle);
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95 if (pubKey && pubKey->pkcs11Slot) {
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96 PK11_FreeSlot(pubKey->pkcs11Slot);
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97 pubKey->pkcs11Slot = NULL;
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98 pubKey->pkcs11ID = CK_INVALID_HANDLE;
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99 }
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100 }
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101 }
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102 if (privKey == NULL) goto rsa_failed;
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103 if (pubKey == NULL) goto rsa_failed;
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104
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105 wrapData.len = SECKEY_PublicKeyStrength(pubKey);
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106 if (!wrapData.len) goto rsa_failed;
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107 wrapData.data = PORT_Alloc(wrapData.len);
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108 if (wrapData.data == NULL) goto rsa_failed;
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109
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110 /* now wrap the keys in and out */
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111 rv = PK11_PubWrapSymKey(CKM_RSA_PKCS, pubKey, symKey, &wrapData);
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112 if (rv == SECSuccess) {
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113 newSymKey = PK11_PubUnwrapSymKeyWithFlagsPerm(privKey,
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114 &wrapData,type,operation,symKeyLength,flags,isPerm);
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115 /* make sure we wound up where we wanted to be! */
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116 if (newSymKey && newSymKey->slot != slot) {
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117 PK11_FreeSymKey(newSymKey);
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118 newSymKey = NULL;
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119 }
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120 }
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121 rsa_failed:
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122 if (wrapData.data != NULL) PORT_Free(wrapData.data);
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123 if (privKey != NULL) SECKEY_DestroyPrivateKey(privKey);
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124 if (pubKey != NULL) SECKEY_DestroyPublicKey(pubKey);
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125
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126 return newSymKey;
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127 }
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128 PORT_SetError( SEC_ERROR_NO_MODULE );
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
129 return NULL;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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130 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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131
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