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 0000000000..ac6e872686
--- /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;
+}