The Tor Browser: security/nss/cmd/crmf-cgi/crmfcgi.c@97036ab72558 (annotated)

security/nss/cmd/crmf-cgi/crmfcgi.c@97036ab72558 (annotated)

security/nss/cmd/crmf-cgi/crmfcgi.c

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* 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 "seccomon.h"
 #include "nss.h"
 #include "key.h"
 #include "cert.h"
 #include "pk11func.h"
 #include "secmod.h"
 #include "cmmf.h"
 #include "crmf.h"
 #include "base64.h"
 #include "secasn1.h"
 #include "cryptohi.h"
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
 #define DEFAULT_ALLOC_SIZE 200
 #define DEFAULT_CGI_VARS   20
 typedef struct CGIVariableStr {
   char *name;
   char *value;
 } CGIVariable;
 typedef struct CGIVarTableStr {
   CGIVariable **variables;
   int           numVars;
   int           numAlloc;
 } CGIVarTable;
 typedef struct CertResponseInfoStr {
   CERTCertificate *cert;
   long             certReqID;
 } CertResponseInfo;
 typedef struct ChallengeCreationInfoStr {
   long             random;
   SECKEYPublicKey *pubKey;
 } ChallengeCreationInfo;
 char *missingVar = NULL;
 /*
  * Error values.
  */
 typedef enum {
   NO_ERROR = 0,
   NSS_INIT_FAILED,
   AUTH_FAILED,
   REQ_CGI_VAR_NOT_PRESENT,
   CRMF_REQ_NOT_PRESENT,
   BAD_ASCII_FOR_REQ,
   CGI_VAR_MISSING,
   COULD_NOT_FIND_CA,
   COULD_NOT_DECODE_REQS,
   OUT_OF_MEMORY,
   ERROR_RETRIEVING_REQUEST_MSG,
   ERROR_RETRIEVING_CERT_REQUEST,
   ERROR_RETRIEVING_SUBJECT_FROM_REQ,
   ERROR_RETRIEVING_PUBLIC_KEY_FROM_REQ,
   ERROR_CREATING_NEW_CERTIFICATE,
   COULD_NOT_START_EXTENSIONS,
   ERROR_RETRIEVING_EXT_FROM_REQ,
   ERROR_ADDING_EXT_TO_CERT,
   ERROR_ENDING_EXTENSIONS,
   COULD_NOT_FIND_ISSUER_PRIVATE_KEY,
   UNSUPPORTED_SIGN_OPERATION_FOR_ISSUER,
   ERROR_SETTING_SIGN_ALG,
   ERROR_ENCODING_NEW_CERT,
   ERROR_SIGNING_NEW_CERT,
   ERROR_CREATING_CERT_REP_CONTENT,
   ERROR_CREATING_SINGLE_CERT_RESPONSE,
   ERROR_SETTING_CERT_RESPONSES,
   ERROR_CREATING_CA_LIST,
   ERROR_ADDING_ISSUER_TO_CA_LIST,
   ERROR_ENCODING_CERT_REP_CONTENT,
   NO_POP_FOR_REQUEST,
   UNSUPPORTED_POP,
   ERROR_RETRIEVING_POP_SIGN_KEY,
   ERROR_RETRIEVING_ALG_ID_FROM_SIGN_KEY,
   ERROR_RETRIEVING_SIGNATURE_FROM_POP_SIGN_KEY,
   DO_CHALLENGE_RESPONSE,
   ERROR_RETRIEVING_PUB_KEY_FROM_NEW_CERT,
   ERROR_ENCODING_CERT_REQ_FOR_POP,
   ERROR_VERIFYING_SIGNATURE_POP,
   ERROR_RETRIEVING_PUB_KEY_FOR_CHALL,
   ERROR_CREATING_EMPTY_CHAL_CONTENT,
   ERROR_EXTRACTING_GEN_NAME_FROM_ISSUER,
   ERROR_SETTING_CHALLENGE,
   ERROR_ENCODING_CHALL,
   ERROR_CONVERTING_CHALL_TO_BASE64,
   ERROR_CONVERTING_RESP_FROM_CHALL_TO_BIN,
   ERROR_CREATING_KEY_RESP_FROM_DER,
   ERROR_RETRIEVING_CLIENT_RESPONSE_TO_CHALLENGE,
   ERROR_RETURNED_CHALL_NOT_VALUE_EXPECTED,
   ERROR_GETTING_KEY_ENCIPHERMENT,
   ERROR_NO_POP_FOR_PRIVKEY,
   ERROR_UNSUPPORTED_POPOPRIVKEY_TYPE
 } ErrorCode;
 const char *
 CGITableFindValue(CGIVarTable *varTable, const char *key);
 void
 spitOutHeaders(void)
 {
   printf("Content-type: text/html\n\n");
 }
 void
 dumpRequest(CGIVarTable *varTable)
 {
   int i;
   CGIVariable *var;
   printf ("<table border=1 cellpadding=1 cellspacing=1 width=\"100%%\">\n");
   printf ("<tr><td><b><center>Variable Name<center></b></td>"
           "<td><b><center>Value</center></b></td></tr>\n");
   for (i=0; i<varTable->numVars; i++) {
     var = varTable->variables[i];
     printf ("<tr><td><pre>%s</pre></td><td><pre>%s</pre></td></tr>\n",
              var->name, var->value);
   }
   printf("</table>\n");
 }
 void
 echo_request(CGIVarTable *varTable)
 {
   spitOutHeaders();
   printf("<html><head><title>CGI Echo Page</title></head>\n"
 	 "<body><h1>Got the following request</h1>\n");
   dumpRequest(varTable);
   printf("</body></html>");
 }
 void
 processVariable(CGIVariable *var)
 {
   char *plusSign, *percentSign;
   /*First look for all of the '+' and convert them to spaces */
   plusSign = var->value;
   while ((plusSign=strchr(plusSign, '+')) != NULL) {
     *plusSign = ' ';
   }
   percentSign = var->value;
   while ((percentSign=strchr(percentSign, '%')) != NULL) {
     char string[3];
     int  value;
     string[0] = percentSign[1];
     string[1] = percentSign[2];
     string[2] = '\0';
     sscanf(string,"%x", &value);
     *percentSign = (char)value;
     memmove(&percentSign[1], &percentSign[3], 1+strlen(&percentSign[3]));
   }
 }
 char *
 parseNextVariable(CGIVarTable *varTable, char *form_output)
 {
   char *ampersand, *equal;
   CGIVariable *var;
   if (varTable->numVars == varTable->numAlloc) {
     CGIVariable **newArr = realloc(varTable->variables,
                                    (varTable->numAlloc + DEFAULT_CGI_VARS)*sizeof(CGIVariable*));
     if (newArr == NULL) {
       return NULL;
     }
     varTable->variables = newArr;
     varTable->numAlloc += DEFAULT_CGI_VARS;
   }
   equal     = strchr(form_output, '=');
   if (equal == NULL) {
     return NULL;
   }
   ampersand = strchr(equal, '&');
   if (ampersand == NULL) {
     return NULL;
   }
   equal[0] = '\0';
   if (ampersand != NULL) {
     ampersand[0] = '\0';
   }
   var = malloc(sizeof(CGIVariable));
   var->name = form_output;
   var->value = &equal[1];
   varTable->variables[varTable->numVars] = var;
   varTable->numVars++;
   processVariable(var);
   return (ampersand != NULL) ? &ampersand[1] : NULL;
 }
 void
 ParseInputVariables(CGIVarTable *varTable, char *form_output)
 {
   varTable->variables = malloc(sizeof(CGIVariable*)*DEFAULT_CGI_VARS);
   varTable->numVars = 0;
   varTable->numAlloc = DEFAULT_CGI_VARS;
   while (form_output && form_output[0] != '\0') {
     form_output = parseNextVariable(varTable, form_output);
   }
 }
 const char *
 CGITableFindValue(CGIVarTable *varTable, const char *key)
 {
   const char *retVal = NULL;
   int i;
   for (i=0; i<varTable->numVars; i++) {
     if (strcmp(varTable->variables[i]->name, key) == 0) {
       retVal = varTable->variables[i]->value;
       break;
     }
   }
   return retVal;
 }
 char*
 passwordCallback(PK11SlotInfo *slot, PRBool retry, void *arg)
 {
   const char *passwd;
   if (retry) {
     return NULL;
   }
   passwd = CGITableFindValue((CGIVarTable*)arg, "dbPassword");
   if (passwd == NULL) {
     return NULL;
   }
   return PORT_Strdup(passwd);
 }
 ErrorCode
 initNSS(CGIVarTable *varTable)
 {
   const char *nssDir;
   PK11SlotInfo *keySlot;
   SECStatus rv;
   nssDir = CGITableFindValue(varTable,"NSSDirectory");
   if (nssDir == NULL) {
     missingVar = "NSSDirectory";
     return REQ_CGI_VAR_NOT_PRESENT;
   }
   rv = NSS_Init(nssDir);
   if (rv != SECSuccess) {
     return NSS_INIT_FAILED;
   }
   PK11_SetPasswordFunc(passwordCallback);
   keySlot = PK11_GetInternalKeySlot();
   rv = PK11_Authenticate(keySlot, PR_FALSE, varTable);
   PK11_FreeSlot(keySlot);
   if (rv != SECSuccess) {
     return AUTH_FAILED;
   }
   return NO_ERROR;
 }
 void
 dumpErrorMessage(ErrorCode errNum)
 {
   spitOutHeaders();
   printf("<html><head><title>Error</title></head><body><h1>Error processing "
 	 "data</h1> Received the error %d<p>", errNum);
   if (errNum  ==   REQ_CGI_VAR_NOT_PRESENT) {
     printf ("The missing variable is %s.", missingVar);
   }
   printf ("<i>More useful information here in the future.</i></body></html>");
 }
 ErrorCode
 initOldCertReq(CERTCertificateRequest *oldCertReq,
 	       CERTName *subject, CERTSubjectPublicKeyInfo *spki)
 {
   PLArenaPool *poolp;
   poolp = oldCertReq->arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
   SEC_ASN1EncodeInteger(poolp, &oldCertReq->version,
 			SEC_CERTIFICATE_VERSION_3);
   CERT_CopyName(poolp, &oldCertReq->subject, subject);
   SECKEY_CopySubjectPublicKeyInfo(poolp, &oldCertReq->subjectPublicKeyInfo,
 				  spki);
   oldCertReq->attributes = NULL;
   return NO_ERROR;
 }
 ErrorCode
 addExtensions(CERTCertificate *newCert, CRMFCertRequest *certReq)
 {
   int numExtensions, i;
   void *extHandle;
   ErrorCode rv = NO_ERROR;
   CRMFCertExtension *ext;
   SECStatus srv;
   numExtensions = CRMF_CertRequestGetNumberOfExtensions(certReq);
   if (numExtensions == 0) {
     /* No extensions to add */
     return NO_ERROR;
   }
   extHandle = CERT_StartCertExtensions(newCert);
   if (extHandle == NULL) {
     rv = COULD_NOT_START_EXTENSIONS;
     goto loser;
   }
   for (i=0; i<numExtensions; i++) {
     ext = CRMF_CertRequestGetExtensionAtIndex(certReq, i);
     if (ext == NULL) {
       rv = ERROR_RETRIEVING_EXT_FROM_REQ;
     }
     srv = CERT_AddExtension(extHandle, CRMF_CertExtensionGetOidTag(ext),
 			    CRMF_CertExtensionGetValue(ext),
 			    CRMF_CertExtensionGetIsCritical(ext), PR_FALSE);
     if (srv != SECSuccess) {
       rv = ERROR_ADDING_EXT_TO_CERT;
     }
   }
   srv = CERT_FinishExtensions(extHandle);
   if (srv != SECSuccess) {
     rv = ERROR_ENDING_EXTENSIONS;
     goto loser;
   }
   return NO_ERROR;
  loser:
   return rv;
 }
 void
 writeOutItem(const char *filePath, SECItem *der)
 {
   PRFileDesc *outfile;
   outfile = PR_Open (filePath,
 		     PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,
 );
   PR_Write(outfile, der->data, der->len);
   PR_Close(outfile);
 }
 ErrorCode
 createNewCert(CERTCertificate**issuedCert,CERTCertificateRequest *oldCertReq,
 	      CRMFCertReqMsg *currReq, CRMFCertRequest *certReq,
 	      CERTCertificate *issuerCert, CGIVarTable *varTable)
 {
   CERTCertificate *newCert = NULL;
   CERTValidity *validity;
   PRExplodedTime printableTime;
   PRTime now, after;
   ErrorCode rv=NO_ERROR;
   SECKEYPrivateKey *issuerPrivKey;
   SECItem derCert = { 0 };
   SECOidTag signTag;
   SECStatus srv;
   long version;
   now = PR_Now();
   PR_ExplodeTime(now, PR_GMTParameters, &printableTime);
   printableTime.tm_month += 9;
   after = PR_ImplodeTime(&printableTime);
   validity = CERT_CreateValidity(now, after);
   newCert = *issuedCert =
     CERT_CreateCertificate(rand(), &(issuerCert->subject), validity,
 			   oldCertReq);
   if (newCert == NULL) {
     rv = ERROR_CREATING_NEW_CERTIFICATE;
     goto loser;
   }
   rv = addExtensions(newCert, certReq);
   if (rv != NO_ERROR) {
     goto loser;
   }
   issuerPrivKey = PK11_FindKeyByAnyCert(issuerCert, varTable);
   if (issuerPrivKey == NULL) {
     rv = COULD_NOT_FIND_ISSUER_PRIVATE_KEY;
   }
   signTag = SEC_GetSignatureAlgorithmOidTag(issuerPrivatekey->keytype,
 					    SEC_OID_UNKNOWN);
   if (signTag == SEC_OID_UNKNOWN) {
     rv = UNSUPPORTED_SIGN_OPERATION_FOR_ISSUER;
     goto loser;
   }
   srv = SECOID_SetAlgorithmID(newCert->arena, &newCert->signature,
 			      signTag, 0);
   if (srv != SECSuccess) {
     rv = ERROR_SETTING_SIGN_ALG;
     goto loser;
   }
   srv = CRMF_CertRequestGetCertTemplateVersion(certReq, &version);
   if (srv != SECSuccess) {
     /* No version included in the request */
     *(newCert->version.data) = SEC_CERTIFICATE_VERSION_3;
   } else {
     SECITEM_FreeItem(&newCert->version, PR_FALSE);
     SEC_ASN1EncodeInteger(newCert->arena, &newCert->version, version);
   }
   SEC_ASN1EncodeItem(newCert->arena, &derCert, newCert,
 		     CERT_CertificateTemplate);
   if (derCert.data == NULL) {
     rv = ERROR_ENCODING_NEW_CERT;
     goto loser;
   }
   srv = SEC_DerSignData(newCert->arena, &(newCert->derCert), derCert.data,
 			derCert.len, issuerPrivKey, signTag);
   if (srv != SECSuccess) {
     rv = ERROR_SIGNING_NEW_CERT;
     goto loser;
   }
 #ifdef WRITE_OUT_RESPONSE
   writeOutItem("newcert.der", &newCert->derCert);
 #endif
   return NO_ERROR;
  loser:
   *issuedCert = NULL;
   if (newCert) {
     CERT_DestroyCertificate(newCert);
   }
   return rv;
 }
 void
 formatCMMFResponse(char *nickname, char *base64Response)
 {
   char *currLine, *nextLine;
   printf("var retVal = crypto.importUserCertificates(\"%s\",\n", nickname);
   currLine = base64Response;
   while (1) {
     nextLine = strchr(currLine, '\n');
     if (nextLine == NULL) {
       /* print out the last line here. */
       printf ("\"%s\",\n", currLine);
       break;
     }
     nextLine[0] = '\0';
     printf("\"%s\\n\"+\n", currLine);
     currLine = nextLine+1;
   }
   printf("true);\n"
 	 "if(retVal == '') {\n"
 	 "\tdocument.write(\"<h1>New Certificate Successfully Imported.</h1>\");\n"
 	 "} else {\n"
 	 "\tdocument.write(\"<h2>Unable to import New Certificate</h2>\");\n"
 	 "\tdocument.write(\"crypto.importUserCertificates returned <b>\");\n"
 	 "\tdocument.write(retVal);\n"
 	 "\tdocument.write(\"</b>\");\n"
 	 "}\n");
 }
 void
 spitOutCMMFResponse(char *nickname, char *base64Response)
 {
   spitOutHeaders();
   printf("<html>\n<head>\n<title>CMMF Resonse Page</title>\n</head>\n\n"
 	 "<body><h1>CMMF Response Page</h1>\n"
 	 "<script language=\"JavaScript\">\n"
 	 "<!--\n");
   formatCMMFResponse(nickname, base64Response);
   printf("// -->\n"
 	 "</script>\n</body>\n</html>");
 }
 char*
 getNickname(CERTCertificate *cert)
 {
   char *nickname;
   if (cert->nickname != NULL) {
     return cert->nickname;
   }
   nickname = CERT_GetCommonName(&cert->subject);
   if (nickname != NULL) {
     return nickname;
   }
   return CERT_NameToAscii(&cert->subject);
 }
 ErrorCode
 createCMMFResponse(CertResponseInfo *issuedCerts, int numCerts,
 		   CERTCertificate *issuerCert, char **base64der)
 {
  CMMFCertRepContent *certRepContent=NULL;
   ErrorCode rv = NO_ERROR;
   CMMFCertResponse **responses, *currResponse;
   CERTCertList *caList;
   int i;
   SECStatus srv;
   PLArenaPool *poolp;
   SECItem *der;
   certRepContent = CMMF_CreateCertRepContent();
   if (certRepContent == NULL) {
     rv = ERROR_CREATING_CERT_REP_CONTENT;
     goto loser;
   }
   responses = PORT_NewArray(CMMFCertResponse*, numCerts);
   if (responses == NULL) {
     rv = OUT_OF_MEMORY;
     goto loser;
   }
   for (i=0; i<numCerts;i++) {
     responses[i] = currResponse =
       CMMF_CreateCertResponse(issuedCerts[i].certReqID);
     if (currResponse == NULL) {
       rv = ERROR_CREATING_SINGLE_CERT_RESPONSE;
       goto loser;
     }
     CMMF_CertResponseSetPKIStatusInfoStatus(currResponse, cmmfGranted);
     CMMF_CertResponseSetCertificate(currResponse, issuedCerts[i].cert);
   }
   srv = CMMF_CertRepContentSetCertResponses(certRepContent, responses,
 					    numCerts);
   if (srv != SECSuccess) {
     rv = ERROR_SETTING_CERT_RESPONSES;
     goto loser;
   }
   caList = CERT_NewCertList();
   if (caList == NULL) {
     rv = ERROR_CREATING_CA_LIST;
     goto loser;
   }
   srv = CERT_AddCertToListTail(caList, issuerCert);
   if (srv != SECSuccess) {
     rv = ERROR_ADDING_ISSUER_TO_CA_LIST;
     goto loser;
   }
   srv = CMMF_CertRepContentSetCAPubs(certRepContent, caList);
   CERT_DestroyCertList(caList);
   poolp = PORT_NewArena(1024);
   der = SEC_ASN1EncodeItem(poolp, NULL, certRepContent,
 			   CMMFCertRepContentTemplate);
   if (der == NULL) {
     rv = ERROR_ENCODING_CERT_REP_CONTENT;
     goto loser;
   }
 #ifdef WRITE_OUT_RESPONSE
   writeOutItem("CertRepContent.der", der);
 #endif
   *base64der = BTOA_DataToAscii(der->data, der->len);
   return NO_ERROR;
  loser:
   return rv;
 }
 ErrorCode
 issueCerts(CertResponseInfo *issuedCerts, int numCerts,
 	   CERTCertificate *issuerCert)
 {
   ErrorCode rv;
   char *base64Response;
   rv = createCMMFResponse(issuedCerts, numCerts, issuerCert, &base64Response);
   if (rv != NO_ERROR) {
     goto loser;
   }
   spitOutCMMFResponse(getNickname(issuedCerts[0].cert),base64Response);
   return NO_ERROR;
  loser:
   return rv;
 }
 ErrorCode
 verifySignature(CGIVarTable *varTable, CRMFCertReqMsg *currReq,
 		CRMFCertRequest *certReq, CERTCertificate *newCert)
 {
   SECStatus srv;
   ErrorCode rv = NO_ERROR;
   CRMFPOPOSigningKey *signKey   = NULL;
   SECAlgorithmID     *algID     = NULL;
   SECItem            *signature = NULL;
   SECKEYPublicKey    *pubKey    = NULL;
   SECItem            *reqDER    = NULL;
   srv = CRMF_CertReqMsgGetPOPOSigningKey(currReq, &signKey);
   if (srv != SECSuccess || signKey == NULL) {
     rv = ERROR_RETRIEVING_POP_SIGN_KEY;
     goto loser;
   }
   algID = CRMF_POPOSigningKeyGetAlgID(signKey);
   if (algID == NULL) {
     rv = ERROR_RETRIEVING_ALG_ID_FROM_SIGN_KEY;
     goto loser;
   }
   signature = CRMF_POPOSigningKeyGetSignature(signKey);
   if (signature == NULL) {
     rv = ERROR_RETRIEVING_SIGNATURE_FROM_POP_SIGN_KEY;
     goto loser;
   }
   /* Make the length the number of bytes instead of bits */
   signature->len = (signature->len+7)/8;
   pubKey = CERT_ExtractPublicKey(newCert);
   if (pubKey == NULL) {
     rv = ERROR_RETRIEVING_PUB_KEY_FROM_NEW_CERT;
     goto loser;
   }
   reqDER = SEC_ASN1EncodeItem(NULL, NULL, certReq, CRMFCertRequestTemplate);
   if (reqDER == NULL) {
     rv = ERROR_ENCODING_CERT_REQ_FOR_POP;
     goto loser;
   }
   srv = VFY_VerifyDataWithAlgorithmID(reqDER->data, reqDER->len, pubKey,
 			signature, &algID->algorithm, NULL, varTable);
   if (srv != SECSuccess) {
     rv = ERROR_VERIFYING_SIGNATURE_POP;
     goto loser;
   }
   /* Fall thru in successfull case. */
  loser:
   if (pubKey != NULL) {
     SECKEY_DestroyPublicKey(pubKey);
   }
   if (reqDER != NULL) {
     SECITEM_FreeItem(reqDER, PR_TRUE);
   }
   if (signature != NULL) {
     SECITEM_FreeItem(signature, PR_TRUE);
   }
   if (algID != NULL) {
     SECOID_DestroyAlgorithmID(algID, PR_TRUE);
   }
   if (signKey != NULL) {
     CRMF_DestroyPOPOSigningKey(signKey);
   }
   return rv;
 }
 ErrorCode
 doChallengeResponse(CGIVarTable *varTable, CRMFCertReqMsg *currReq,
 		    CRMFCertRequest *certReq, CERTCertificate *newCert,
 		    ChallengeCreationInfo *challs, int *numChall)
 {
   CRMFPOPOPrivKey *privKey = NULL;
   CRMFPOPOPrivKeyChoice privKeyChoice;
   SECStatus srv;
   ErrorCode rv = NO_ERROR;
   srv = CRMF_CertReqMsgGetPOPKeyEncipherment(currReq, &privKey);
   if (srv != SECSuccess || privKey == NULL) {
     rv = ERROR_GETTING_KEY_ENCIPHERMENT;
     goto loser;
   }
   privKeyChoice = CRMF_POPOPrivKeyGetChoice(privKey);
   CRMF_DestroyPOPOPrivKey(privKey);
   switch (privKeyChoice) {
   case crmfSubsequentMessage:
     challs = &challs[*numChall];
     challs->random = rand();
     challs->pubKey = CERT_ExtractPublicKey(newCert);
     if (challs->pubKey == NULL) {
       rv = ERROR_RETRIEVING_PUB_KEY_FOR_CHALL;
       goto loser;
     }
     (*numChall)++;
     rv = DO_CHALLENGE_RESPONSE;
     break;
   case crmfThisMessage:
     /* There'd better be a PKIArchiveControl in this message */
     if (!CRMF_CertRequestIsControlPresent(certReq,
 					  crmfPKIArchiveOptionsControl)) {
       rv = ERROR_NO_POP_FOR_PRIVKEY;
       goto loser;
     }
     break;
   default:
     rv = ERROR_UNSUPPORTED_POPOPRIVKEY_TYPE;
     goto loser;
   }
 loser:
   return rv;
 }
 ErrorCode
 doProofOfPossession(CGIVarTable *varTable, CRMFCertReqMsg *currReq,
 		    CRMFCertRequest *certReq, CERTCertificate *newCert,
 		    ChallengeCreationInfo *challs, int *numChall)
 {
   CRMFPOPChoice popChoice;
   ErrorCode rv = NO_ERROR;
   popChoice = CRMF_CertReqMsgGetPOPType(currReq);
   if (popChoice == crmfNoPOPChoice) {
     rv = NO_POP_FOR_REQUEST;
     goto loser;
   }
   switch (popChoice) {
   case crmfSignature:
     rv = verifySignature(varTable, currReq, certReq, newCert);
     break;
   case crmfKeyEncipherment:
     rv = doChallengeResponse(varTable, currReq, certReq, newCert,
 			     challs, numChall);
     break;
   case crmfRAVerified:
   case crmfKeyAgreement:
   default:
     rv = UNSUPPORTED_POP;
     goto loser;
   }
  loser:
   return rv;
 }
 void
 convertB64ToJS(char *base64)
 {
   int i;
   for (i=0; base64[i] != '\0'; i++) {
     if (base64[i] == '\n') {
       printf ("\\n");
     }else {
       printf ("%c", base64[i]);
     }
   }
 }
 void
 formatChallenge(char *chall64, char *certRepContentDER,
 		 ChallengeCreationInfo *challInfo, int numChalls)
 {
   printf ("function respondToChallenge() {\n"
 	  "  var chalForm = document.chalForm;\n\n"
 	  "  chalForm.CertRepContent.value = '");
   convertB64ToJS(certRepContentDER);
   printf ("';\n"
 	  "  chalForm.ChallResponse.value = crypto.popChallengeResponse('");
   convertB64ToJS(chall64);
   printf("');\n"
 	 "  chalForm.submit();\n"
 	 "}\n");
 }
 void
 spitOutChallenge(char *chall64, char *certRepContentDER,
 		 ChallengeCreationInfo *challInfo, int numChalls,
 		 char *nickname)
 {
   int i;
   spitOutHeaders();
   printf("<html>\n"
 	 "<head>\n"
 	 "<title>Challenge Page</title>\n"
 	 "<script language=\"JavaScript\">\n"
 	 "<!--\n");
   /* The JavaScript function actually gets defined within
    * this function call
    */
   formatChallenge(chall64, certRepContentDER, challInfo, numChalls);
   printf("// -->\n"
 	 "</script>\n"
 	 "</head>\n"
 	 "<body onLoad='respondToChallenge()'>\n"
 	 "<h1>Cartman is now responding to the Challenge "
 	 "presented by the CGI</h1>\n"
 	 "<form action='crmfcgi' method='post' name='chalForm'>\n"
 	 "<input type='hidden' name=CertRepContent value=''>\n"
 	 "<input type='hidden' name=ChallResponse value=''>\n");
   for (i=0;i<numChalls; i++) {
     printf("<input type='hidden' name='chal%d' value='%d'>\n",
 	   i+1, challInfo[i].random);
   }
   printf("<input type='hidden' name='nickname' value='%s'>\n", nickname);
   printf("</form>\n</body>\n</html>");
 }
 ErrorCode
 issueChallenge(CertResponseInfo *issuedCerts, int numCerts,
 	       ChallengeCreationInfo *challInfo, int numChalls,
 	       CERTCertificate *issuer, CGIVarTable *varTable)
 {
   ErrorCode rv = NO_ERROR;
   CMMFPOPODecKeyChallContent *chalContent = NULL;
   int i;
   SECStatus srv;
   PLArenaPool *poolp;
   CERTGeneralName *genName;
   SECItem *challDER = NULL;
   char *chall64, *certRepContentDER;
   rv = createCMMFResponse(issuedCerts, numCerts, issuer,
 			  &certRepContentDER);
   if (rv != NO_ERROR) {
     goto loser;
   }
   chalContent = CMMF_CreatePOPODecKeyChallContent();
   if (chalContent == NULL) {
     rv = ERROR_CREATING_EMPTY_CHAL_CONTENT;
     goto loser;
   }
   poolp = PORT_NewArena(1024);
   if (poolp == NULL) {
     rv = OUT_OF_MEMORY;
     goto loser;
   }
   genName = CERT_GetCertificateNames(issuer, poolp);
   if (genName == NULL) {
     rv = ERROR_EXTRACTING_GEN_NAME_FROM_ISSUER;
     goto loser;
   }
   for (i=0;i<numChalls;i++) {
     srv = CMMF_POPODecKeyChallContentSetNextChallenge(chalContent,
 						      challInfo[i].random,
 						      genName,
 						      challInfo[i].pubKey,
 						      varTable);
     SECKEY_DestroyPublicKey(challInfo[i].pubKey);
     if (srv != SECSuccess) {
       rv = ERROR_SETTING_CHALLENGE;
       goto loser;
     }
   }
   challDER = SEC_ASN1EncodeItem(NULL, NULL, chalContent,
 				CMMFPOPODecKeyChallContentTemplate);
   if (challDER == NULL) {
     rv = ERROR_ENCODING_CHALL;
     goto loser;
   }
   chall64 = BTOA_DataToAscii(challDER->data, challDER->len);
   SECITEM_FreeItem(challDER, PR_TRUE);
   if (chall64 == NULL) {
     rv = ERROR_CONVERTING_CHALL_TO_BASE64;
     goto loser;
   }
   spitOutChallenge(chall64, certRepContentDER, challInfo, numChalls,
 		   getNickname(issuedCerts[0].cert));
  loser:
   return rv;
 }
 ErrorCode
 processRequest(CGIVarTable *varTable)
 {
   CERTCertDBHandle *certdb;
   SECKEYKeyDBHandle *keydb;
   CRMFCertReqMessages *certReqs = NULL;
   const char *crmfReq;
   const char *caNickname;
   CERTCertificate *caCert = NULL;
   CertResponseInfo *issuedCerts = NULL;
   CERTSubjectPublicKeyInfo spki = { 0 };
   ErrorCode rv=NO_ERROR;
   PRBool doChallengeResponse = PR_FALSE;
   SECItem der = { 0 };
   SECStatus srv;
   CERTCertificateRequest oldCertReq = { 0 };
   CRMFCertReqMsg **reqMsgs = NULL,*currReq = NULL;
   CRMFCertRequest **reqs = NULL, *certReq = NULL;
   CERTName         subject = { 0 };
   int numReqs,i;
   ChallengeCreationInfo *challInfo=NULL;
   int numChalls = 0;
   certdb = CERT_GetDefaultCertDB();
   keydb = SECKEY_GetDefaultKeyDB();
   crmfReq = CGITableFindValue(varTable, "CRMFRequest");
   if (crmfReq == NULL) {
     rv = CGI_VAR_MISSING;
     missingVar = "CRMFRequest";
     goto loser;
   }
   caNickname = CGITableFindValue(varTable, "CANickname");
   if (caNickname == NULL) {
     rv = CGI_VAR_MISSING;
     missingVar = "CANickname";
     goto loser;
   }
   caCert = CERT_FindCertByNickname(certdb, caNickname);
   if (caCert == NULL) {
     rv = COULD_NOT_FIND_CA;
     goto loser;
   }
   srv = ATOB_ConvertAsciiToItem(&der, crmfReq);
   if (srv != SECSuccess) {
     rv = BAD_ASCII_FOR_REQ;
     goto loser;
   }
   certReqs = CRMF_CreateCertReqMessagesFromDER(der.data, der.len);
   SECITEM_FreeItem(&der, PR_FALSE);
   if (certReqs == NULL) {
     rv = COULD_NOT_DECODE_REQS;
     goto loser;
   }
   numReqs = CRMF_CertReqMessagesGetNumMessages(certReqs);
   issuedCerts = PORT_ZNewArray(CertResponseInfo, numReqs);
   challInfo   = PORT_ZNewArray(ChallengeCreationInfo, numReqs);
   if (issuedCerts == NULL || challInfo == NULL) {
     rv = OUT_OF_MEMORY;
     goto loser;
   }
   reqMsgs = PORT_ZNewArray(CRMFCertReqMsg*,   numReqs);
   reqs    = PORT_ZNewArray(CRMFCertRequest*, numReqs);
   if (reqMsgs == NULL || reqs == NULL) {
     rv =   OUT_OF_MEMORY;
     goto loser;
   }
   for (i=0; i<numReqs; i++) {
     currReq = reqMsgs[i] =
       CRMF_CertReqMessagesGetCertReqMsgAtIndex(certReqs, i);
     if (currReq == NULL) {
       rv = ERROR_RETRIEVING_REQUEST_MSG;
       goto loser;
     }
     certReq = reqs[i] = CRMF_CertReqMsgGetCertRequest(currReq);
     if (certReq == NULL) {
       rv = ERROR_RETRIEVING_CERT_REQUEST;
       goto loser;
     }
     srv = CRMF_CertRequestGetCertTemplateSubject(certReq, &subject);
     if (srv != SECSuccess) {
       rv = ERROR_RETRIEVING_SUBJECT_FROM_REQ;
       goto loser;
     }
     srv = CRMF_CertRequestGetCertTemplatePublicKey(certReq, &spki);
     if (srv != SECSuccess) {
       rv = ERROR_RETRIEVING_PUBLIC_KEY_FROM_REQ;
       goto loser;
     }
     rv = initOldCertReq(&oldCertReq, &subject, &spki);
     if (rv != NO_ERROR) {
       goto loser;
     }
     rv = createNewCert(&issuedCerts[i].cert, &oldCertReq, currReq, certReq,
 		       caCert, varTable);
     if (rv != NO_ERROR) {
       goto loser;
     }
     rv = doProofOfPossession(varTable, currReq, certReq, issuedCerts[i].cert,
 			     challInfo, &numChalls);
     if (rv != NO_ERROR) {
       if (rv == DO_CHALLENGE_RESPONSE) {
 	doChallengeResponse = PR_TRUE;
       } else {
 	goto loser;
       }
     }
     CRMF_CertReqMsgGetID(currReq, &issuedCerts[i].certReqID);
     CRMF_DestroyCertReqMsg(currReq);
     CRMF_DestroyCertRequest(certReq);
   }
   if (doChallengeResponse) {
     rv = issueChallenge(issuedCerts, numReqs, challInfo, numChalls, caCert,
 			varTable);
   } else {
     rv = issueCerts(issuedCerts, numReqs, caCert);
   }
  loser:
   if (certReqs != NULL) {
     CRMF_DestroyCertReqMessages(certReqs);
   }
   return rv;
 }
 ErrorCode
 processChallengeResponse(CGIVarTable *varTable, const char *certRepContent)
 {
   SECItem binDER = { 0 };
   SECStatus srv;
   ErrorCode rv = NO_ERROR;
   const char *clientResponse;
   const char *formChalValue;
   const char *nickname;
   CMMFPOPODecKeyRespContent *respContent = NULL;
   int numResponses,i;
   long curResponse, expectedResponse;
   char cgiChalVar[10];
 #ifdef WRITE_OUT_RESPONSE
   SECItem certRepBinDER = { 0 };
   ATOB_ConvertAsciiToItem(&certRepBinDER, certRepContent);
   writeOutItem("challCertRepContent.der", &certRepBinDER);
   PORT_Free(certRepBinDER.data);
 #endif
   clientResponse = CGITableFindValue(varTable, "ChallResponse");
   if (clientResponse == NULL) {
     rv =   REQ_CGI_VAR_NOT_PRESENT;
     missingVar = "ChallResponse";
     goto loser;
   }
   srv = ATOB_ConvertAsciiToItem(&binDER, clientResponse);
   if (srv != SECSuccess) {
     rv = ERROR_CONVERTING_RESP_FROM_CHALL_TO_BIN;
     goto loser;
   }
   respContent = CMMF_CreatePOPODecKeyRespContentFromDER(binDER.data,
 							binDER.len);
   SECITEM_FreeItem(&binDER, PR_FALSE);
   binDER.data = NULL;
   if (respContent == NULL) {
     rv = ERROR_CREATING_KEY_RESP_FROM_DER;
     goto loser;
   }
   numResponses = CMMF_POPODecKeyRespContentGetNumResponses(respContent);
   for (i=0;i<numResponses;i++){
     srv = CMMF_POPODecKeyRespContentGetResponse(respContent,i,&curResponse);
     if (srv != SECSuccess) {
       rv = ERROR_RETRIEVING_CLIENT_RESPONSE_TO_CHALLENGE;
       goto loser;
     }
     sprintf(cgiChalVar, "chal%d", i+1);
     formChalValue = CGITableFindValue(varTable, cgiChalVar);
     if (formChalValue == NULL) {
       rv = REQ_CGI_VAR_NOT_PRESENT;
       missingVar = strdup(cgiChalVar);
       goto loser;
     }
     sscanf(formChalValue, "%ld", &expectedResponse);
     if (expectedResponse != curResponse) {
       rv = ERROR_RETURNED_CHALL_NOT_VALUE_EXPECTED;
       goto loser;
     }
   }
   nickname = CGITableFindValue(varTable, "nickname");
   if (nickname == NULL) {
     rv = REQ_CGI_VAR_NOT_PRESENT;
     missingVar = "nickname";
     goto loser;
   }
   spitOutCMMFResponse(nickname, certRepContent);
  loser:
   if (respContent != NULL) {
     CMMF_DestroyPOPODecKeyRespContent(respContent);
   }
   return rv;
 }
 int
 main()
 {
   char *form_output = NULL;
   int   form_output_len, form_output_used;
   CGIVarTable varTable = { 0 };
   ErrorCode errNum = 0;
   char *certRepContent;
 #ifdef ATTACH_CGI
   /* Put an ifinite loop in here so I can attach to
    * the process after the process is spun off
    */
   { int stupid = 1;
     while (stupid);
   }
 #endif
   form_output_used = 0;
   srand(time(NULL));
   while (feof(stdin) == 0) {
     if (form_output == NULL) {
       form_output = PORT_NewArray(char, DEFAULT_ALLOC_SIZE+1);
       form_output_len  = DEFAULT_ALLOC_SIZE;
     } else if ((form_output_used + DEFAULT_ALLOC_SIZE) >= form_output_len) {
       form_output_len += DEFAULT_ALLOC_SIZE;
       form_output = PORT_Realloc(form_output, form_output_len+1);
     }
     form_output_used += fread(&form_output[form_output_used], sizeof(char),
 			      DEFAULT_ALLOC_SIZE, stdin);
   }
   ParseInputVariables(&varTable, form_output);
   certRepContent = CGITableFindValue(&varTable, "CertRepContent");
   if (certRepContent == NULL) {
     errNum = initNSS(&varTable);
     if (errNum != 0) {
       goto loser;
     }
     errNum = processRequest(&varTable);
   } else {
     errNum = processChallengeResponse(&varTable, certRepContent);
   }
   if (errNum != NO_ERROR) {
     goto loser;
   }
   goto done;
 loser:
   dumpErrorMessage(errNum);
 done:
   free (form_output);
   return 0;
 }

The Tor Browser / annotate

security/nss/cmd/crmf-cgi/crmfcgi.c@97036ab72558 (annotated)

security/nss/cmd/crmf-cgi/crmfcgi.c