diff options
Diffstat (limited to 'security/nss/lib/pkcs7/certread.c')
| -rw-r--r-- | security/nss/lib/pkcs7/certread.c | 528 |
1 files changed, 528 insertions, 0 deletions
diff --git a/security/nss/lib/pkcs7/certread.c b/security/nss/lib/pkcs7/certread.c new file mode 100644 index 000000000..2d692f1a2 --- /dev/null +++ b/security/nss/lib/pkcs7/certread.c @@ -0,0 +1,528 @@ +/* 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 "cert.h" +#include "base64.h" +#include "secitem.h" +#include "secder.h" +#include "secasn1.h" +#include "secoid.h" +#include "secerr.h" + +SEC_ASN1_MKSUB(SEC_AnyTemplate) +SEC_ASN1_MKSUB(SEC_SetOfAnyTemplate) + +typedef struct ContentInfoStr ContentInfo; +typedef struct DegenerateSignedDataStr DegenerateSignedData; + +struct ContentInfoStr { + SECOidTag contentTypeTag; /* local; not part of encoding */ + SECItem contentType; + union { + SECItem *data; + DegenerateSignedData *signedData; + } content; +}; + +struct DegenerateSignedDataStr { + SECItem version; + SECItem **digestAlgorithms; + ContentInfo contentInfo; + SECItem **certificates; + SECItem **crls; + SECItem **signerInfos; +}; + +static const SEC_ASN1Template * +choose_content_template(void *src_or_dest, PRBool encoding); + +static const SEC_ASN1TemplateChooserPtr template_chooser = choose_content_template; + +static const SEC_ASN1Template ContentInfoTemplate[] = { + { SEC_ASN1_SEQUENCE, + 0, NULL, sizeof(ContentInfo) }, + { SEC_ASN1_OBJECT_ID, + offsetof(ContentInfo, contentType) }, + { SEC_ASN1_OPTIONAL | SEC_ASN1_DYNAMIC | + SEC_ASN1_EXPLICIT | SEC_ASN1_CONSTRUCTED | SEC_ASN1_CONTEXT_SPECIFIC | 0, + offsetof(ContentInfo, content), + &template_chooser }, + { 0 } +}; + +static const SEC_ASN1Template DegenerateSignedDataTemplate[] = { + { SEC_ASN1_SEQUENCE, + 0, NULL, sizeof(DegenerateSignedData) }, + { SEC_ASN1_INTEGER, + offsetof(DegenerateSignedData, version) }, + { SEC_ASN1_SET_OF | SEC_ASN1_XTRN, + offsetof(DegenerateSignedData, digestAlgorithms), + SEC_ASN1_SUB(SEC_AnyTemplate) }, + { SEC_ASN1_INLINE, + offsetof(DegenerateSignedData, contentInfo), + ContentInfoTemplate }, + { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED | SEC_ASN1_CONTEXT_SPECIFIC | + SEC_ASN1_XTRN | 0, + offsetof(DegenerateSignedData, certificates), + SEC_ASN1_SUB(SEC_SetOfAnyTemplate) }, + { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED | SEC_ASN1_CONTEXT_SPECIFIC | + SEC_ASN1_XTRN | 1, + offsetof(DegenerateSignedData, crls), + SEC_ASN1_SUB(SEC_SetOfAnyTemplate) }, + { SEC_ASN1_SET_OF | SEC_ASN1_XTRN, + offsetof(DegenerateSignedData, signerInfos), + SEC_ASN1_SUB(SEC_AnyTemplate) }, + { 0 } +}; + +static const SEC_ASN1Template PointerToDegenerateSignedDataTemplate[] = { + { SEC_ASN1_POINTER, 0, DegenerateSignedDataTemplate } +}; + +static SECOidTag +GetContentTypeTag(ContentInfo *cinfo) +{ + if (cinfo->contentTypeTag == SEC_OID_UNKNOWN) + cinfo->contentTypeTag = SECOID_FindOIDTag(&cinfo->contentType); + return cinfo->contentTypeTag; +} + +static const SEC_ASN1Template * +choose_content_template(void *src_or_dest, PRBool encoding) +{ + const SEC_ASN1Template *theTemplate; + ContentInfo *cinfo; + SECOidTag kind; + + PORT_Assert(src_or_dest != NULL); + if (src_or_dest == NULL) + return NULL; + + cinfo = (ContentInfo *)src_or_dest; + kind = GetContentTypeTag(cinfo); + switch (kind) { + default: + theTemplate = SEC_ASN1_GET(SEC_PointerToAnyTemplate); + break; + case SEC_OID_PKCS7_DATA: + theTemplate = SEC_ASN1_GET(SEC_PointerToOctetStringTemplate); + break; + case SEC_OID_PKCS7_SIGNED_DATA: + theTemplate = PointerToDegenerateSignedDataTemplate; + break; + } + return theTemplate; +} + +static SECStatus +SEC_ReadPKCS7Certs(SECItem *pkcs7Item, CERTImportCertificateFunc f, void *arg) +{ + ContentInfo contentInfo; + SECStatus rv = SECFailure; + SECItem **certs; + int count; + PLArenaPool *arena; + + arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE); + if (arena == NULL) { + return rv; + } + + PORT_Memset(&contentInfo, 0, sizeof(contentInfo)); + if (SEC_ASN1DecodeItem(arena, &contentInfo, ContentInfoTemplate, + pkcs7Item) != SECSuccess) { + goto done; + } + + if (GetContentTypeTag(&contentInfo) != SEC_OID_PKCS7_SIGNED_DATA) { + goto done; + } + + rv = SECSuccess; + + certs = contentInfo.content.signedData->certificates; + if (certs) { + count = 0; + + while (*certs) { + count++; + certs++; + } + rv = (*f)(arg, contentInfo.content.signedData->certificates, count); + } + +done: + if (arena) { + PORT_FreeArena(arena, PR_FALSE); + } + + return rv; +} + +const SEC_ASN1Template SEC_CertSequenceTemplate[] = { + { SEC_ASN1_SEQUENCE_OF | SEC_ASN1_XTRN, 0, SEC_ASN1_SUB(SEC_AnyTemplate) } +}; + +static SECStatus +SEC_ReadCertSequence(SECItem *certsItem, CERTImportCertificateFunc f, void *arg) +{ + SECStatus rv = SECFailure; + SECItem **certs; + int count; + SECItem **rawCerts = NULL; + PLArenaPool *arena; + ContentInfo contentInfo; + + arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE); + if (arena == NULL) { + return rv; + } + + PORT_Memset(&contentInfo, 0, sizeof(contentInfo)); + if (SEC_ASN1DecodeItem(arena, &contentInfo, ContentInfoTemplate, + certsItem) != SECSuccess) { + goto done; + } + + if (GetContentTypeTag(&contentInfo) != SEC_OID_NS_TYPE_CERT_SEQUENCE) { + goto done; + } + + if (SEC_QuickDERDecodeItem(arena, &rawCerts, SEC_CertSequenceTemplate, + contentInfo.content.data) != SECSuccess) { + goto done; + } + + rv = SECSuccess; + + certs = rawCerts; + if (certs) { + count = 0; + + while (*certs) { + count++; + certs++; + } + rv = (*f)(arg, rawCerts, count); + } + +done: + if (arena) { + PORT_FreeArena(arena, PR_FALSE); + } + + return rv; +} + +CERTCertificate * +CERT_ConvertAndDecodeCertificate(char *certstr) +{ + CERTCertificate *cert; + SECStatus rv; + SECItem der; + + rv = ATOB_ConvertAsciiToItem(&der, certstr); + if (rv != SECSuccess) + return NULL; + + cert = CERT_NewTempCertificate(CERT_GetDefaultCertDB(), + &der, NULL, PR_FALSE, PR_TRUE); + + PORT_Free(der.data); + return cert; +} + +static const char NS_CERT_HEADER[] = "-----BEGIN CERTIFICATE-----"; +static const char NS_CERT_TRAILER[] = "-----END CERTIFICATE-----"; +#define NS_CERT_HEADER_LEN ((sizeof NS_CERT_HEADER) - 1) +#define NS_CERT_TRAILER_LEN ((sizeof NS_CERT_TRAILER) - 1) + +/* + * read an old style ascii or binary certificate chain + */ +SECStatus +CERT_DecodeCertPackage(char *certbuf, + int certlen, + CERTImportCertificateFunc f, + void *arg) +{ + unsigned char *cp; + unsigned char *bincert = NULL; + char *ascCert = NULL; + SECStatus rv; + + if (certbuf == NULL) { + PORT_SetError(SEC_ERROR_INVALID_ARGS); + return (SECFailure); + } + /* + * Make sure certlen is long enough to handle the longest possible + * reference in the code below: + * 0x30 0x84 l1 l2 l3 l4 + + * tag 9 o1 o2 o3 o4 o5 o6 o7 o8 o9 + * where 9 is the longest length of the expected oids we are testing. + * 6 + 11 = 17. 17 bytes is clearly too small to code any kind of + * certificate (a 128 bit ECC certificate contains at least an 8 byte + * key and a 16 byte signature, plus coding overhead). Typically a cert + * is much larger. So it's safe to require certlen to be at least 17 + * bytes. + */ + if (certlen < 17) { + PORT_SetError(SEC_ERROR_INPUT_LEN); + return (SECFailure); + } + + cp = (unsigned char *)certbuf; + + /* is a DER encoded certificate of some type? */ + if ((*cp & 0x1f) == SEC_ASN1_SEQUENCE) { + SECItem certitem; + SECItem *pcertitem = &certitem; + PRUint64 seqLen, seqLenLen; + + cp++; + + if (*cp & 0x80) { + /* Multibyte length */ + seqLenLen = cp[0] & 0x7f; + + switch (seqLenLen) { + case 4: + seqLen = ((unsigned long)cp[1] << 24) | + ((unsigned long)cp[2] << 16) | (cp[3] << 8) | cp[4]; + break; + case 3: + seqLen = ((unsigned long)cp[1] << 16) | (cp[2] << 8) | cp[3]; + break; + case 2: + seqLen = (cp[1] << 8) | cp[2]; + break; + case 1: + seqLen = cp[1]; + break; + case 0: + /* indefinite length */ + seqLen = 0; + break; + default: + goto notder; + } + cp += (seqLenLen + 1); + + } else { + seqLenLen = 0; + seqLen = *cp; + cp++; + } + + /* check entire length if definite length */ + if (seqLen || seqLenLen) { + if (certlen != (seqLen + seqLenLen + 2L)) { + if (certlen > (seqLen + seqLenLen + 2L)) + PORT_SetError(SEC_ERROR_EXTRA_INPUT); + else + PORT_SetError(SEC_ERROR_INPUT_LEN); + goto notder; + } + } + + /* check the type oid */ + if (cp[0] == SEC_ASN1_OBJECT_ID) { + SECOidData *oiddata; + SECItem oiditem; + /* XXX - assume DER encoding of OID len!! */ + oiditem.len = cp[1]; + /* if we add an oid below that is longer than 9 bytes, then we + * need to change the certlen check at the top of the function + * to prevent a buffer overflow + */ + if (oiditem.len > 9) { + PORT_SetError(SEC_ERROR_UNRECOGNIZED_OID); + return (SECFailure); + } + oiditem.data = (unsigned char *)&cp[2]; + oiddata = SECOID_FindOID(&oiditem); + if (oiddata == NULL) { + return (SECFailure); + } + + certitem.data = (unsigned char *)certbuf; + certitem.len = certlen; + + switch (oiddata->offset) { + case SEC_OID_PKCS7_SIGNED_DATA: + /* oid: 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x07, 0x02 */ + return (SEC_ReadPKCS7Certs(&certitem, f, arg)); + break; + case SEC_OID_NS_TYPE_CERT_SEQUENCE: + /* oid: 0x60, 0x86, 0x48, 0x01, 0x86, 0xf8, 0x42, 0x02, 0x05 */ + return (SEC_ReadCertSequence(&certitem, f, arg)); + break; + default: + break; + } + + } else { + /* it had better be a certificate by now!! */ + certitem.data = (unsigned char *)certbuf; + certitem.len = certlen; + + rv = (*f)(arg, &pcertitem, 1); + return (rv); + } + } + +/* now look for a netscape base64 ascii encoded cert */ +notder : { + unsigned char *certbegin = NULL; + unsigned char *certend = NULL; + char *pc; + int cl; + + /* Convert the ASCII data into a nul-terminated string */ + ascCert = (char *)PORT_Alloc(certlen + 1); + if (!ascCert) { + rv = SECFailure; + goto loser; + } + + PORT_Memcpy(ascCert, certbuf, certlen); + ascCert[certlen] = '\0'; + + pc = PORT_Strchr(ascCert, '\n'); /* find an EOL */ + if (!pc) { /* maybe this is a MAC file */ + pc = ascCert; + while (*pc && NULL != (pc = PORT_Strchr(pc, '\r'))) { + *pc++ = '\n'; + } + } + + cp = (unsigned char *)ascCert; + cl = certlen; + + /* find the beginning marker */ + while (cl > NS_CERT_HEADER_LEN) { + int found = 0; + if (!PORT_Strncasecmp((char *)cp, NS_CERT_HEADER, + NS_CERT_HEADER_LEN)) { + cl -= NS_CERT_HEADER_LEN; + cp += NS_CERT_HEADER_LEN; + found = 1; + } + + /* skip to next eol */ + while (cl && (*cp != '\n')) { + cp++; + cl--; + } + + /* skip all blank lines */ + while (cl && (*cp == '\n' || *cp == '\r')) { + cp++; + cl--; + } + if (cl && found) { + certbegin = cp; + break; + } + } + + if (certbegin) { + /* find the ending marker */ + while (cl >= NS_CERT_TRAILER_LEN) { + if (!PORT_Strncasecmp((char *)cp, NS_CERT_TRAILER, + NS_CERT_TRAILER_LEN)) { + certend = cp; + break; + } + + /* skip to next eol */ + while (cl && (*cp != '\n')) { + cp++; + cl--; + } + + /* skip all blank lines */ + while (cl && (*cp == '\n' || *cp == '\r')) { + cp++; + cl--; + } + } + } + + if (certbegin && certend) { + unsigned int binLen; + + *certend = 0; + /* convert to binary */ + bincert = ATOB_AsciiToData((char *)certbegin, &binLen); + if (!bincert) { + rv = SECFailure; + goto loser; + } + + /* now recurse to decode the binary */ + rv = CERT_DecodeCertPackage((char *)bincert, binLen, f, arg); + + } else { + PORT_SetError(SEC_ERROR_BAD_DER); + rv = SECFailure; + } +} + +loser: + + if (bincert) { + PORT_Free(bincert); + } + + if (ascCert) { + PORT_Free(ascCert); + } + + return (rv); +} + +typedef struct { + PLArenaPool *arena; + SECItem cert; +} collect_args; + +static SECStatus +collect_certs(void *arg, SECItem **certs, int numcerts) +{ + SECStatus rv; + collect_args *collectArgs; + + collectArgs = (collect_args *)arg; + + rv = SECITEM_CopyItem(collectArgs->arena, &collectArgs->cert, *certs); + + return (rv); +} + +/* + * read an old style ascii or binary certificate + */ +CERTCertificate * +CERT_DecodeCertFromPackage(char *certbuf, int certlen) +{ + collect_args collectArgs; + SECStatus rv; + CERTCertificate *cert = NULL; + + collectArgs.arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE); + + rv = CERT_DecodeCertPackage(certbuf, certlen, collect_certs, + (void *)&collectArgs); + if (rv == SECSuccess) { + cert = CERT_NewTempCertificate(CERT_GetDefaultCertDB(), + &collectArgs.cert, NULL, + PR_FALSE, PR_TRUE); + } + + PORT_FreeArena(collectArgs.arena, PR_FALSE); + + return (cert); +} |