diff options
Diffstat (limited to 'security/nss/lib/smime/cmsattr.c')
| -rw-r--r-- | security/nss/lib/smime/cmsattr.c | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/security/nss/lib/smime/cmsattr.c b/security/nss/lib/smime/cmsattr.c new file mode 100644 index 000000000..c1ec760d2 --- /dev/null +++ b/security/nss/lib/smime/cmsattr.c @@ -0,0 +1,425 @@ +/* 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/. */ + +/* + * CMS attributes. + */ + +#include "cmslocal.h" + +#include "secasn1.h" +#include "secitem.h" +#include "secoid.h" +#include "pk11func.h" +#include "prtime.h" +#include "secerr.h" + +/* + * ------------------------------------------------------------------- + * XXX The following Attribute stuff really belongs elsewhere. + * The Attribute type is *not* part of CMS but rather X.501. + * But for now, since CMS is the only customer of attributes, + * we define them here. Once there is a use outside of CMS, + * then change the attribute types and functions from internal + * to external naming convention, and move them elsewhere! + */ + +/* + * NSS_CMSAttribute_Create - create an attribute + * + * if value is NULL, the attribute won't have a value. It can be added later + * with NSS_CMSAttribute_AddValue. + */ +NSSCMSAttribute * +NSS_CMSAttribute_Create(PLArenaPool *poolp, SECOidTag oidtag, SECItem *value, + PRBool encoded) +{ + NSSCMSAttribute *attr; + SECItem *copiedvalue; + void *mark; + + PORT_Assert(poolp != NULL); + + mark = PORT_ArenaMark(poolp); + + attr = (NSSCMSAttribute *)PORT_ArenaZAlloc(poolp, sizeof(NSSCMSAttribute)); + if (attr == NULL) + goto loser; + + attr->typeTag = SECOID_FindOIDByTag(oidtag); + if (attr->typeTag == NULL) + goto loser; + + if (SECITEM_CopyItem(poolp, &(attr->type), &(attr->typeTag->oid)) != SECSuccess) + goto loser; + + if (value != NULL) { + if ((copiedvalue = SECITEM_ArenaDupItem(poolp, value)) == NULL) + goto loser; + + if (NSS_CMSArray_Add(poolp, (void ***)&(attr->values), (void *)copiedvalue) != SECSuccess) + goto loser; + } + + attr->encoded = encoded; + + PORT_ArenaUnmark(poolp, mark); + + return attr; + +loser: + PORT_Assert(mark != NULL); + PORT_ArenaRelease(poolp, mark); + return NULL; +} + +/* + * NSS_CMSAttribute_AddValue - add another value to an attribute + */ +SECStatus +NSS_CMSAttribute_AddValue(PLArenaPool *poolp, NSSCMSAttribute *attr, SECItem *value) +{ + SECItem *copiedvalue; + void *mark; + + PORT_Assert(poolp != NULL); + + mark = PORT_ArenaMark(poolp); + + if (value == NULL) { + PORT_SetError(SEC_ERROR_INVALID_ARGS); + goto loser; + } + + if ((copiedvalue = SECITEM_ArenaDupItem(poolp, value)) == NULL) + goto loser; + + if (NSS_CMSArray_Add(poolp, (void ***)&(attr->values), (void *)copiedvalue) != SECSuccess) + goto loser; + + PORT_ArenaUnmark(poolp, mark); + return SECSuccess; + +loser: + PORT_Assert(mark != NULL); + PORT_ArenaRelease(poolp, mark); + return SECFailure; +} + +/* + * NSS_CMSAttribute_GetType - return the OID tag + */ +SECOidTag +NSS_CMSAttribute_GetType(NSSCMSAttribute *attr) +{ + SECOidData *typetag; + + typetag = SECOID_FindOID(&(attr->type)); + if (typetag == NULL) + return SEC_OID_UNKNOWN; + + return typetag->offset; +} + +/* + * NSS_CMSAttribute_GetValue - return the first attribute value + * + * We do some sanity checking first: + * - Multiple values are *not* expected. + * - Empty values are *not* expected. + */ +SECItem * +NSS_CMSAttribute_GetValue(NSSCMSAttribute *attr) +{ + SECItem *value; + + if (attr == NULL) + return NULL; + + value = attr->values[0]; + + if (value == NULL || value->data == NULL || value->len == 0) + return NULL; + + if (attr->values[1] != NULL) + return NULL; + + return value; +} + +/* + * NSS_CMSAttribute_CompareValue - compare the attribute's first value against data + */ +PRBool +NSS_CMSAttribute_CompareValue(NSSCMSAttribute *attr, SECItem *av) +{ + SECItem *value; + + if (attr == NULL) + return PR_FALSE; + + value = NSS_CMSAttribute_GetValue(attr); + + return (value != NULL && value->len == av->len && + PORT_Memcmp(value->data, av->data, value->len) == 0); +} + +/* + * templates and functions for separate ASN.1 encoding of attributes + * + * used in NSS_CMSAttributeArray_Reorder + */ + +/* + * helper function for dynamic template determination of the attribute value + */ +static const SEC_ASN1Template * +cms_attr_choose_attr_value_template(void *src_or_dest, PRBool encoding) +{ + const SEC_ASN1Template *theTemplate; + NSSCMSAttribute *attribute; + SECOidData *oiddata; + PRBool encoded; + + PORT_Assert(src_or_dest != NULL); + if (src_or_dest == NULL) + return NULL; + + attribute = (NSSCMSAttribute *)src_or_dest; + + if (encoding && (!attribute->values || !attribute->values[0] || + attribute->encoded)) { + /* we're encoding, and the attribute has no value or the attribute + * value is already encoded. */ + return SEC_ASN1_GET(SEC_AnyTemplate); + } + + /* get attribute's typeTag */ + oiddata = attribute->typeTag; + if (oiddata == NULL) { + oiddata = SECOID_FindOID(&attribute->type); + attribute->typeTag = oiddata; + } + + if (oiddata == NULL) { + /* still no OID tag? OID is unknown then. en/decode value as ANY. */ + encoded = PR_TRUE; + theTemplate = SEC_ASN1_GET(SEC_AnyTemplate); + } else { + switch (oiddata->offset) { + case SEC_OID_PKCS9_SMIME_CAPABILITIES: + case SEC_OID_SMIME_ENCRYPTION_KEY_PREFERENCE: + /* these guys need to stay DER-encoded */ + default: + /* same goes for OIDs that are not handled here */ + encoded = PR_TRUE; + theTemplate = SEC_ASN1_GET(SEC_AnyTemplate); + break; + /* otherwise choose proper template */ + case SEC_OID_PKCS9_EMAIL_ADDRESS: + case SEC_OID_RFC1274_MAIL: + case SEC_OID_PKCS9_UNSTRUCTURED_NAME: + encoded = PR_FALSE; + theTemplate = SEC_ASN1_GET(SEC_IA5StringTemplate); + break; + case SEC_OID_PKCS9_CONTENT_TYPE: + encoded = PR_FALSE; + theTemplate = SEC_ASN1_GET(SEC_ObjectIDTemplate); + break; + case SEC_OID_PKCS9_MESSAGE_DIGEST: + encoded = PR_FALSE; + theTemplate = SEC_ASN1_GET(SEC_OctetStringTemplate); + break; + case SEC_OID_PKCS9_SIGNING_TIME: + encoded = PR_FALSE; + theTemplate = SEC_ASN1_GET(CERT_TimeChoiceTemplate); + break; + /* XXX Want other types here, too */ + } + } + + if (encoding) { + /* + * If we are encoding and we think we have an already-encoded value, + * then the code which initialized this attribute should have set + * the "encoded" property to true (and we would have returned early, + * up above). No devastating error, but that code should be fixed. + * (It could indicate that the resulting encoded bytes are wrong.) + */ + PORT_Assert(!encoded); + } else { + /* + * We are decoding; record whether the resulting value is + * still encoded or not. + */ + attribute->encoded = encoded; + } + return theTemplate; +} + +static const SEC_ASN1TemplateChooserPtr cms_attr_chooser = cms_attr_choose_attr_value_template; + +const SEC_ASN1Template nss_cms_attribute_template[] = { + { SEC_ASN1_SEQUENCE, + 0, NULL, sizeof(NSSCMSAttribute) }, + { SEC_ASN1_OBJECT_ID, + offsetof(NSSCMSAttribute, type) }, + { SEC_ASN1_DYNAMIC | SEC_ASN1_SET_OF, + offsetof(NSSCMSAttribute, values), + &cms_attr_chooser }, + { 0 } +}; + +const SEC_ASN1Template nss_cms_set_of_attribute_template[] = { + { SEC_ASN1_SET_OF, 0, nss_cms_attribute_template }, +}; + +/* ============================================================================= + * Attribute Array methods + */ + +/* + * NSS_CMSAttributeArray_Encode - encode an Attribute array as SET OF Attributes + * + * If you are wondering why this routine does not reorder the attributes + * first, and might be tempted to make it do so, see the comment by the + * call to ReorderAttributes in cmsencode.c. (Or, see who else calls this + * and think long and hard about the implications of making it always + * do the reordering.) + */ +SECItem * +NSS_CMSAttributeArray_Encode(PLArenaPool *poolp, NSSCMSAttribute ***attrs, SECItem *dest) +{ + return SEC_ASN1EncodeItem(poolp, dest, (void *)attrs, nss_cms_set_of_attribute_template); +} + +/* + * NSS_CMSAttributeArray_Reorder - sort attribute array by attribute's DER encoding + * + * make sure that the order of the attributes guarantees valid DER (which must be + * in lexigraphically ascending order for a SET OF); if reordering is necessary it + * will be done in place (in attrs). + */ +SECStatus +NSS_CMSAttributeArray_Reorder(NSSCMSAttribute **attrs) +{ + return NSS_CMSArray_SortByDER((void **)attrs, nss_cms_attribute_template, NULL); +} + +/* + * NSS_CMSAttributeArray_FindAttrByOidTag - look through a set of attributes and + * find one that matches the specified object ID. + * + * If "only" is true, then make sure that there is not more than one attribute + * of the same type. Otherwise, just return the first one found. (XXX Does + * anybody really want that first-found behavior? It was like that when I found it...) + */ +NSSCMSAttribute * +NSS_CMSAttributeArray_FindAttrByOidTag(NSSCMSAttribute **attrs, SECOidTag oidtag, PRBool only) +{ + SECOidData *oid; + NSSCMSAttribute *attr1, *attr2; + + if (attrs == NULL) + return NULL; + + oid = SECOID_FindOIDByTag(oidtag); + if (oid == NULL) + return NULL; + + while ((attr1 = *attrs++) != NULL) { + if (attr1->type.len == oid->oid.len && + PORT_Memcmp(attr1->type.data, oid->oid.data, oid->oid.len) == 0) + break; + } + + if (attr1 == NULL) + return NULL; + + if (!only) + return attr1; + + while ((attr2 = *attrs++) != NULL) { + if (attr2->type.len == oid->oid.len && + PORT_Memcmp(attr2->type.data, oid->oid.data, oid->oid.len) == 0) + break; + } + + if (attr2 != NULL) + return NULL; + + return attr1; +} + +/* + * NSS_CMSAttributeArray_AddAttr - add an attribute to an + * array of attributes. + */ +SECStatus +NSS_CMSAttributeArray_AddAttr(PLArenaPool *poolp, NSSCMSAttribute ***attrs, + NSSCMSAttribute *attr) +{ + NSSCMSAttribute *oattr; + void *mark; + SECOidTag type; + + mark = PORT_ArenaMark(poolp); + + /* find oidtag of attr */ + type = NSS_CMSAttribute_GetType(attr); + + /* see if we have one already */ + oattr = NSS_CMSAttributeArray_FindAttrByOidTag(*attrs, type, PR_FALSE); + PORT_Assert(oattr == NULL); + if (oattr != NULL) + goto loser; /* XXX or would it be better to replace it? */ + + /* no, shove it in */ + if (NSS_CMSArray_Add(poolp, (void ***)attrs, (void *)attr) != SECSuccess) + goto loser; + + PORT_ArenaUnmark(poolp, mark); + return SECSuccess; + +loser: + PORT_ArenaRelease(poolp, mark); + return SECFailure; +} + +/* + * NSS_CMSAttributeArray_SetAttr - set an attribute's value in a set of attributes + */ +SECStatus +NSS_CMSAttributeArray_SetAttr(PLArenaPool *poolp, NSSCMSAttribute ***attrs, + SECOidTag type, SECItem *value, PRBool encoded) +{ + NSSCMSAttribute *attr; + void *mark; + + mark = PORT_ArenaMark(poolp); + + /* see if we have one already */ + attr = NSS_CMSAttributeArray_FindAttrByOidTag(*attrs, type, PR_FALSE); + if (attr == NULL) { + /* not found? create one! */ + attr = NSS_CMSAttribute_Create(poolp, type, value, encoded); + if (attr == NULL) + goto loser; + /* and add it to the list */ + if (NSS_CMSArray_Add(poolp, (void ***)attrs, (void *)attr) != SECSuccess) + goto loser; + } else { + /* found, shove it in */ + /* XXX we need a decent memory model @#$#$!#!!! */ + attr->values[0] = value; + attr->encoded = encoded; + } + + PORT_ArenaUnmark(poolp, mark); + return SECSuccess; + +loser: + PORT_ArenaRelease(poolp, mark); + return SECFailure; +} |