static void
multipart_set_boundary (CamelMultipart *multipart,
const gchar *boundary)
{
CamelDataWrapper *cdw = CAMEL_DATA_WRAPPER (multipart);
gchar *bgen, bbuf[27], *p;
guint8 *digest;
gsize length;
gint state, save;
g_return_if_fail (cdw->mime_type != NULL);
length = g_checksum_type_get_length (G_CHECKSUM_MD5);
digest = g_alloca (length);
if (!boundary) {
GChecksum *checksum;
/* Generate a fairly random boundary string. */
bgen = g_strdup_printf ("%p:%lu:%lu", (gpointer) multipart,
(gulong) getpid (),
(gulong) time (NULL));
checksum = g_checksum_new (G_CHECKSUM_MD5);
g_checksum_update (checksum, (guchar *) bgen, -1);
g_checksum_get_digest (checksum, digest, &length);
g_checksum_free (checksum);
g_free (bgen);
strcpy (bbuf, "=-");
p = bbuf + 2;
state = save = 0;
p += g_base64_encode_step (
(guchar *) digest, length, FALSE, p, &state, &save);
*p = '\0';
boundary = bbuf;
}
camel_content_type_set_param (cdw->mime_type, "boundary", boundary);
}
static int
sm_encrypt(CamelCipherContext *context, const char *userid, GPtrArray *recipients, CamelMimePart *ipart, CamelMimePart *opart, CamelException *ex)
{
struct _CamelSMIMEContextPrivate *p = ((CamelSMIMEContext *)context)->priv;
/*NSSCMSRecipientInfo **recipient_infos;*/
CERTCertificate **recipient_certs = NULL;
NSSCMSContentInfo *cinfo;
PK11SymKey *bulkkey = NULL;
SECOidTag bulkalgtag;
int bulkkeysize, i;
CK_MECHANISM_TYPE type;
PK11SlotInfo *slot;
PLArenaPool *poolp;
NSSCMSMessage *cmsg = NULL;
NSSCMSEnvelopedData *envd;
NSSCMSEncoderContext *enc = NULL;
CamelStreamMem *mem;
CamelStream *ostream = NULL;
CamelDataWrapper *dw;
CamelContentType *ct;
poolp = PORT_NewArena(1024);
if (poolp == NULL) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, g_strerror (ENOMEM));
return -1;
}
/* Lookup all recipients certs, for later working */
recipient_certs = (CERTCertificate **)PORT_ArenaZAlloc(poolp, sizeof(*recipient_certs[0])*(recipients->len + 1));
if (recipient_certs == NULL) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, g_strerror (ENOMEM));
goto fail;
}
for (i=0;i<recipients->len;i++) {
recipient_certs[i] = CERT_FindCertByNicknameOrEmailAddr(p->certdb, recipients->pdata[i]);
if (recipient_certs[i] == NULL) {
camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot find certificate for `%s'"), recipients->pdata[i]);
goto fail;
}
}
/* Find a common algorithm, probably 3DES anyway ... */
if (NSS_SMIMEUtil_FindBulkAlgForRecipients(recipient_certs, &bulkalgtag, &bulkkeysize) != SECSuccess) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot find common bulk encryption algorithm"));
goto fail;
}
/* Generate a new bulk key based on the common algorithm - expensive */
type = PK11_AlgtagToMechanism(bulkalgtag);
slot = PK11_GetBestSlot(type, context);
if (slot == NULL) {
/* PORT_GetError(); ?? */
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot allocate slot for encryption bulk key"));
goto fail;
}
bulkkey = PK11_KeyGen(slot, type, NULL, bulkkeysize/8, context);
PK11_FreeSlot(slot);
/* Now we can start building the message */
/* msg->envelopedData->data */
cmsg = NSS_CMSMessage_Create(NULL);
if (cmsg == NULL) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create CMS Message"));
goto fail;
}
envd = NSS_CMSEnvelopedData_Create(cmsg, bulkalgtag, bulkkeysize);
if (envd == NULL) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create CMS Enveloped data"));
goto fail;
}
cinfo = NSS_CMSMessage_GetContentInfo(cmsg);
if (NSS_CMSContentInfo_SetContent_EnvelopedData(cmsg, cinfo, envd) != SECSuccess) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot attach CMS Enveloped data"));
goto fail;
}
cinfo = NSS_CMSEnvelopedData_GetContentInfo(envd);
if (NSS_CMSContentInfo_SetContent_Data(cmsg, cinfo, NULL, PR_FALSE) != SECSuccess) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot attach CMS data object"));
goto fail;
}
/* add recipient certs */
for (i=0;recipient_certs[i];i++) {
NSSCMSRecipientInfo *ri = NSS_CMSRecipientInfo_Create(cmsg, recipient_certs[i]);
if (ri == NULL) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create CMS Recipient information"));
goto fail;
}
if (NSS_CMSEnvelopedData_AddRecipient(envd, ri) != SECSuccess) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot add CMS Recipient information"));
goto fail;
}
}
/* dump it out */
ostream = camel_stream_mem_new();
enc = NSS_CMSEncoder_Start(cmsg,
sm_write_stream, ostream,
NULL, NULL,
NULL, NULL,
sm_decrypt_key, bulkkey,
NULL, NULL);
if (enc == NULL) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create encoder context"));
goto fail;
}
/* FIXME: Stream the input */
/* FIXME: Canonicalise the input? */
mem = (CamelStreamMem *)camel_stream_mem_new();
camel_data_wrapper_write_to_stream((CamelDataWrapper *)ipart, (CamelStream *)mem);
if (NSS_CMSEncoder_Update(enc, (char *) mem->buffer->data, mem->buffer->len) != SECSuccess) {
NSS_CMSEncoder_Cancel(enc);
camel_object_unref(mem);
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Failed to add data to encoder"));
goto fail;
}
camel_object_unref(mem);
if (NSS_CMSEncoder_Finish(enc) != SECSuccess) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Failed to encode data"));
goto fail;
}
PK11_FreeSymKey(bulkkey);
NSS_CMSMessage_Destroy(cmsg);
for (i=0;recipient_certs[i];i++)
CERT_DestroyCertificate(recipient_certs[i]);
PORT_FreeArena(poolp, PR_FALSE);
dw = camel_data_wrapper_new();
camel_data_wrapper_construct_from_stream(dw, ostream);
camel_object_unref(ostream);
dw->encoding = CAMEL_TRANSFER_ENCODING_BINARY;
ct = camel_content_type_new("application", "x-pkcs7-mime");
camel_content_type_set_param(ct, "name", "smime.p7m");
camel_content_type_set_param(ct, "smime-type", "enveloped-data");
camel_data_wrapper_set_mime_type_field(dw, ct);
camel_content_type_unref(ct);
camel_medium_set_content_object((CamelMedium *)opart, dw);
camel_object_unref(dw);
camel_mime_part_set_disposition(opart, "attachment");
camel_mime_part_set_filename(opart, "smime.p7m");
camel_mime_part_set_description(opart, "S/MIME Encrypted Message");
camel_mime_part_set_encoding(opart, CAMEL_TRANSFER_ENCODING_BASE64);
return 0;
fail:
if (ostream)
camel_object_unref(ostream);
if (cmsg)
NSS_CMSMessage_Destroy(cmsg);
if (bulkkey)
PK11_FreeSymKey(bulkkey);
if (recipient_certs) {
for (i=0;recipient_certs[i];i++)
CERT_DestroyCertificate(recipient_certs[i]);
}
PORT_FreeArena(poolp, PR_FALSE);
return -1;
}
static int
sm_sign(CamelCipherContext *context, const char *userid, CamelCipherHash hash, CamelMimePart *ipart, CamelMimePart *opart, CamelException *ex)
{
int res = -1;
NSSCMSMessage *cmsg;
CamelStream *ostream, *istream;
SECOidTag sechash;
NSSCMSEncoderContext *enc;
CamelDataWrapper *dw;
CamelContentType *ct;
switch (hash) {
case CAMEL_CIPHER_HASH_SHA1:
case CAMEL_CIPHER_HASH_DEFAULT:
default:
sechash = SEC_OID_SHA1;
break;
case CAMEL_CIPHER_HASH_MD5:
sechash = SEC_OID_MD5;
break;
}
cmsg = sm_signing_cmsmessage((CamelSMIMEContext *)context, userid, sechash,
((CamelSMIMEContext *)context)->priv->sign_mode == CAMEL_SMIME_SIGN_CLEARSIGN, ex);
if (cmsg == NULL)
return -1;
ostream = camel_stream_mem_new();
/* FIXME: stream this, we stream output at least */
istream = camel_stream_mem_new();
if (camel_cipher_canonical_to_stream(ipart,
CAMEL_MIME_FILTER_CANON_STRIP
|CAMEL_MIME_FILTER_CANON_CRLF
|CAMEL_MIME_FILTER_CANON_FROM, istream) == -1) {
camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
_("Could not generate signing data: %s"), g_strerror(errno));
goto fail;
}
enc = NSS_CMSEncoder_Start(cmsg,
sm_write_stream, ostream, /* DER output callback */
NULL, NULL, /* destination storage */
NULL, NULL, /* password callback */
NULL, NULL, /* decrypt key callback */
NULL, NULL ); /* detached digests */
if (!enc) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create encoder context"));
goto fail;
}
if (NSS_CMSEncoder_Update(enc, (char *) ((CamelStreamMem *)istream)->buffer->data, ((CamelStreamMem *)istream)->buffer->len) != SECSuccess) {
NSS_CMSEncoder_Cancel(enc);
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Failed to add data to CMS encoder"));
goto fail;
}
if (NSS_CMSEncoder_Finish(enc) != SECSuccess) {
camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Failed to encode data"));
goto fail;
}
res = 0;
dw = camel_data_wrapper_new();
camel_stream_reset(ostream);
camel_data_wrapper_construct_from_stream(dw, ostream);
dw->encoding = CAMEL_TRANSFER_ENCODING_BINARY;
if (((CamelSMIMEContext *)context)->priv->sign_mode == CAMEL_SMIME_SIGN_CLEARSIGN) {
CamelMultipartSigned *mps;
CamelMimePart *sigpart;
sigpart = camel_mime_part_new();
ct = camel_content_type_new("application", "x-pkcs7-signature");
camel_content_type_set_param(ct, "name", "smime.p7s");
camel_data_wrapper_set_mime_type_field(dw, ct);
camel_content_type_unref(ct);
camel_medium_set_content_object((CamelMedium *)sigpart, dw);
camel_mime_part_set_filename(sigpart, "smime.p7s");
camel_mime_part_set_disposition(sigpart, "attachment");
camel_mime_part_set_encoding(sigpart, CAMEL_TRANSFER_ENCODING_BASE64);
mps = camel_multipart_signed_new();
ct = camel_content_type_new("multipart", "signed");
camel_content_type_set_param(ct, "micalg", camel_cipher_hash_to_id(context, hash));
camel_content_type_set_param(ct, "protocol", context->sign_protocol);
camel_data_wrapper_set_mime_type_field((CamelDataWrapper *)mps, ct);
camel_content_type_unref(ct);
camel_multipart_set_boundary((CamelMultipart *)mps, NULL);
mps->signature = sigpart;
mps->contentraw = istream;
camel_stream_reset(istream);
camel_object_ref(istream);
camel_medium_set_content_object((CamelMedium *)opart, (CamelDataWrapper *)mps);
} else {
ct = camel_content_type_new("application", "x-pkcs7-mime");
camel_content_type_set_param(ct, "name", "smime.p7m");
camel_content_type_set_param(ct, "smime-type", "signed-data");
camel_data_wrapper_set_mime_type_field(dw, ct);
camel_content_type_unref(ct);
camel_medium_set_content_object((CamelMedium *)opart, dw);
camel_mime_part_set_filename(opart, "smime.p7m");
camel_mime_part_set_description(opart, "S/MIME Signed Message");
camel_mime_part_set_disposition(opart, "attachment");
camel_mime_part_set_encoding(opart, CAMEL_TRANSFER_ENCODING_BASE64);
}
camel_object_unref(dw);
fail:
camel_object_unref(ostream);
camel_object_unref(istream);
return res;
}
