diff options
Diffstat (limited to 'security/nss/lib/crmf/crmfdec.c')
| -rw-r--r-- | security/nss/lib/crmf/crmfdec.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/security/nss/lib/crmf/crmfdec.c b/security/nss/lib/crmf/crmfdec.c new file mode 100644 index 000000000..ac6e87268 --- /dev/null +++ b/security/nss/lib/crmf/crmfdec.c @@ -0,0 +1,360 @@ +/* -*- Mode: C; tab-width: 8 -*-*/ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "crmf.h" +#include "crmfi.h" +#include "secitem.h" + +static CRMFPOPChoice +crmf_get_popchoice_from_der(SECItem *derPOP) +{ + CRMFPOPChoice retChoice; + + switch (derPOP->data[0] & 0x0f) { + case 0: + retChoice = crmfRAVerified; + break; + case 1: + retChoice = crmfSignature; + break; + case 2: + retChoice = crmfKeyEncipherment; + break; + case 3: + retChoice = crmfKeyAgreement; + break; + default: + retChoice = crmfNoPOPChoice; + break; + } + return retChoice; +} + +static SECStatus +crmf_decode_process_raverified(CRMFCertReqMsg *inCertReqMsg) +{ + CRMFProofOfPossession *pop; + /* Just set up the structure so that the message structure + * looks like one that was created using the API + */ + pop = inCertReqMsg->pop; + pop->popChoice.raVerified.data = NULL; + pop->popChoice.raVerified.len = 0; + return SECSuccess; +} + +static SECStatus +crmf_decode_process_signature(CRMFCertReqMsg *inCertReqMsg) +{ + PORT_Assert(inCertReqMsg->poolp); + if (!inCertReqMsg->poolp) { + PORT_SetError(SEC_ERROR_INVALID_ARGS); + return SECFailure; + } + return SEC_ASN1Decode(inCertReqMsg->poolp, + &inCertReqMsg->pop->popChoice.signature, + CRMFPOPOSigningKeyTemplate, + (const char *)inCertReqMsg->derPOP.data, + inCertReqMsg->derPOP.len); +} + +static CRMFPOPOPrivKeyChoice +crmf_get_messagechoice_from_der(SECItem *derPOP) +{ + CRMFPOPOPrivKeyChoice retChoice; + + switch (derPOP->data[2] & 0x0f) { + case 0: + retChoice = crmfThisMessage; + break; + case 1: + retChoice = crmfSubsequentMessage; + break; + case 2: + retChoice = crmfDHMAC; + break; + default: + retChoice = crmfNoMessage; + } + return retChoice; +} + +static SECStatus +crmf_decode_process_popoprivkey(CRMFCertReqMsg *inCertReqMsg) +{ + /* We've got a union, so a pointer to one POPOPrivKey + * struct is the same as having a pointer to the other + * one. + */ + CRMFPOPOPrivKey *popoPrivKey = + &inCertReqMsg->pop->popChoice.keyEncipherment; + SECItem *derPOP, privKeyDer; + SECStatus rv; + + derPOP = &inCertReqMsg->derPOP; + popoPrivKey->messageChoice = crmf_get_messagechoice_from_der(derPOP); + if (popoPrivKey->messageChoice == crmfNoMessage) { + return SECFailure; + } + /* If we ever encounter BER encodings of this, we'll get in trouble*/ + switch (popoPrivKey->messageChoice) { + case crmfThisMessage: + case crmfDHMAC: + privKeyDer.type = derPOP->type; + privKeyDer.data = &derPOP->data[5]; + privKeyDer.len = derPOP->len - 5; + break; + case crmfSubsequentMessage: + privKeyDer.type = derPOP->type; + privKeyDer.data = &derPOP->data[4]; + privKeyDer.len = derPOP->len - 4; + break; + default: + return SECFailure; + } + + rv = SECITEM_CopyItem(inCertReqMsg->poolp, + &popoPrivKey->message.subsequentMessage, + &privKeyDer); + + if (rv != SECSuccess) { + return rv; + } + + if (popoPrivKey->messageChoice == crmfThisMessage || + popoPrivKey->messageChoice == crmfDHMAC) { + + popoPrivKey->message.thisMessage.len = + CRMF_BYTES_TO_BITS(privKeyDer.len) - (int)derPOP->data[4]; + } + return SECSuccess; +} + +static SECStatus +crmf_decode_process_keyagreement(CRMFCertReqMsg *inCertReqMsg) +{ + return crmf_decode_process_popoprivkey(inCertReqMsg); +} + +static SECStatus +crmf_decode_process_keyencipherment(CRMFCertReqMsg *inCertReqMsg) +{ + SECStatus rv; + + rv = crmf_decode_process_popoprivkey(inCertReqMsg); + if (rv != SECSuccess) { + return rv; + } + if (inCertReqMsg->pop->popChoice.keyEncipherment.messageChoice == + crmfDHMAC) { + /* Key Encipherment can not use the dhMAC option for + * POPOPrivKey. + */ + return SECFailure; + } + return SECSuccess; +} + +static SECStatus +crmf_decode_process_pop(CRMFCertReqMsg *inCertReqMsg) +{ + SECItem *derPOP; + PLArenaPool *poolp; + CRMFProofOfPossession *pop; + void *mark; + SECStatus rv; + + derPOP = &inCertReqMsg->derPOP; + poolp = inCertReqMsg->poolp; + if (derPOP->data == NULL) { + /* There is no Proof of Possession field in this message. */ + return SECSuccess; + } + mark = PORT_ArenaMark(poolp); + pop = PORT_ArenaZNew(poolp, CRMFProofOfPossession); + if (pop == NULL) { + goto loser; + } + pop->popUsed = crmf_get_popchoice_from_der(derPOP); + if (pop->popUsed == crmfNoPOPChoice) { + /* A bad encoding of CRMF. Not a valid tag was given to the + * Proof Of Possession field. + */ + goto loser; + } + inCertReqMsg->pop = pop; + switch (pop->popUsed) { + case crmfRAVerified: + rv = crmf_decode_process_raverified(inCertReqMsg); + break; + case crmfSignature: + rv = crmf_decode_process_signature(inCertReqMsg); + break; + case crmfKeyEncipherment: + rv = crmf_decode_process_keyencipherment(inCertReqMsg); + break; + case crmfKeyAgreement: + rv = crmf_decode_process_keyagreement(inCertReqMsg); + break; + default: + rv = SECFailure; + } + if (rv != SECSuccess) { + goto loser; + } + PORT_ArenaUnmark(poolp, mark); + return SECSuccess; + +loser: + PORT_ArenaRelease(poolp, mark); + inCertReqMsg->pop = NULL; + return SECFailure; +} + +static SECStatus +crmf_decode_process_single_control(PLArenaPool *poolp, + CRMFControl *inControl) +{ + const SEC_ASN1Template *asn1Template = NULL; + + inControl->tag = SECOID_FindOIDTag(&inControl->derTag); + asn1Template = crmf_get_pkiarchiveoptions_subtemplate(inControl); + + PORT_Assert(asn1Template != NULL); + PORT_Assert(poolp != NULL); + if (!asn1Template || !poolp) { + PORT_SetError(SEC_ERROR_INVALID_ARGS); + return SECFailure; + } + /* We've got a union, so passing a pointer to one element of the + * union is the same as passing a pointer to any of the other + * members of the union. + */ + return SEC_ASN1Decode(poolp, &inControl->value.archiveOptions, + asn1Template, (const char *)inControl->derValue.data, + inControl->derValue.len); +} + +static SECStatus +crmf_decode_process_controls(CRMFCertReqMsg *inCertReqMsg) +{ + int i, numControls; + SECStatus rv; + PLArenaPool *poolp; + CRMFControl **controls; + + numControls = CRMF_CertRequestGetNumControls(inCertReqMsg->certReq); + controls = inCertReqMsg->certReq->controls; + poolp = inCertReqMsg->poolp; + for (i = 0; i < numControls; i++) { + rv = crmf_decode_process_single_control(poolp, controls[i]); + if (rv != SECSuccess) { + return SECFailure; + } + } + return SECSuccess; +} + +static SECStatus +crmf_decode_process_single_reqmsg(CRMFCertReqMsg *inCertReqMsg) +{ + SECStatus rv; + + rv = crmf_decode_process_pop(inCertReqMsg); + if (rv != SECSuccess) { + goto loser; + } + + rv = crmf_decode_process_controls(inCertReqMsg); + if (rv != SECSuccess) { + goto loser; + } + inCertReqMsg->certReq->certTemplate.numExtensions = + CRMF_CertRequestGetNumberOfExtensions(inCertReqMsg->certReq); + inCertReqMsg->isDecoded = PR_TRUE; + rv = SECSuccess; +loser: + return rv; +} + +CRMFCertReqMsg * +CRMF_CreateCertReqMsgFromDER(const char *buf, long len) +{ + PLArenaPool *poolp; + CRMFCertReqMsg *certReqMsg; + SECStatus rv; + + poolp = PORT_NewArena(CRMF_DEFAULT_ARENA_SIZE); + if (poolp == NULL) { + goto loser; + } + certReqMsg = PORT_ArenaZNew(poolp, CRMFCertReqMsg); + if (certReqMsg == NULL) { + goto loser; + } + certReqMsg->poolp = poolp; + rv = SEC_ASN1Decode(poolp, certReqMsg, CRMFCertReqMsgTemplate, buf, len); + if (rv != SECSuccess) { + goto loser; + } + + rv = crmf_decode_process_single_reqmsg(certReqMsg); + if (rv != SECSuccess) { + goto loser; + } + + return certReqMsg; +loser: + if (poolp != NULL) { + PORT_FreeArena(poolp, PR_FALSE); + } + return NULL; +} + +CRMFCertReqMessages * +CRMF_CreateCertReqMessagesFromDER(const char *buf, long len) +{ + long arenaSize; + int i; + SECStatus rv; + PLArenaPool *poolp; + CRMFCertReqMessages *certReqMsgs; + + PORT_Assert(buf != NULL); + /* Wanna make sure the arena is big enough to store all of the requests + * coming in. We'll guestimate according to the length of the buffer. + */ + arenaSize = len + len / 2; + poolp = PORT_NewArena(arenaSize); + if (poolp == NULL) { + return NULL; + } + certReqMsgs = PORT_ArenaZNew(poolp, CRMFCertReqMessages); + if (certReqMsgs == NULL) { + goto loser; + } + certReqMsgs->poolp = poolp; + rv = SEC_ASN1Decode(poolp, certReqMsgs, CRMFCertReqMessagesTemplate, + buf, len); + if (rv != SECSuccess) { + goto loser; + } + for (i = 0; certReqMsgs->messages[i] != NULL; i++) { + /* The sub-routines expect the individual messages to have + * an arena. We'll give them one temporarily. + */ + certReqMsgs->messages[i]->poolp = poolp; + rv = crmf_decode_process_single_reqmsg(certReqMsgs->messages[i]); + if (rv != SECSuccess) { + goto loser; + } + certReqMsgs->messages[i]->poolp = NULL; + } + return certReqMsgs; + +loser: + PORT_FreeArena(poolp, PR_FALSE); + return NULL; +} |