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authorNot Zed <NotZed@Ximian.com>2003-11-10 20:46:07 +0800
committerMichael Zucci <zucchi@src.gnome.org>2003-11-10 20:46:07 +0800
commitbb90a934d50682e2ffc93d307664b20e6e54bee7 (patch)
treef4b5dd08ce90c3354a3a35892a71592173ba7535 /camel/camel-smime-context.c
parent55e9c607f0bac0a0333552885d97d45c5122bd59 (diff)
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split out the CMSMessage verification code so it can be used from
2003-11-10 Not Zed <NotZed@Ximian.com> * camel-smime-context.c (sm_verify_cmsg): split out the CMSMessage verification code so it can be used from enveloped or externally signed data. * camel-cipher-context.c (camel_cipher_verify): only take a mimepart, internally handle multiparts and the hash. 2003-11-07 Not Zed <NotZed@Ximian.com> * camel-cipher-context.c: make ciphervalidity a public structure, added encrypt status. (camel_cipher_decrypt): changed to return a ciphervalidity. fixed implementations. (camel_cipher_validity_*): Fixed implementations to match new structure, some of this is now redundant. 2003-11-06 Not Zed <NotZed@Ximian.com> * camel-smime-context.c (camel_smime_context_describe_part): implement. svn path=/trunk/; revision=23242
Diffstat (limited to 'camel/camel-smime-context.c')
-rw-r--r--camel/camel-smime-context.c245
1 files changed, 173 insertions, 72 deletions
diff --git a/camel/camel-smime-context.c b/camel/camel-smime-context.c
index 75cbba9e2b..e2af550db8 100644
--- a/camel/camel-smime-context.c
+++ b/camel/camel-smime-context.c
@@ -68,6 +68,41 @@ struct _CamelSMIMEContextPrivate {
static CamelCipherContextClass *parent_class = NULL;
+/* used for decode content callback, for streaming decode */
+static void
+sm_write_stream(void *arg, const char *buf, unsigned long len)
+{
+ camel_stream_write((CamelStream *)arg, buf, len);
+}
+
+static PK11SymKey *
+sm_decrypt_key(void *arg, SECAlgorithmID *algid)
+{
+ printf("Decrypt key called\n");
+ return (PK11SymKey *)arg;
+}
+
+static char *
+sm_get_passwd(PK11SlotInfo *info, PRBool retry, void *arg)
+{
+ CamelSMIMEContext *context = arg;
+ char *pass, *nsspass = NULL;
+ char *prompt;
+ CamelException *ex;
+
+ ex = camel_exception_new();
+ prompt = g_strdup_printf(_("Enter security pass-phrase for `%s'"), PK11_GetTokenName(info));
+ pass = camel_session_get_password(((CamelCipherContext *)context)->session, prompt, FALSE, TRUE, NULL, PK11_GetTokenName(info), ex);
+ camel_exception_free(ex);
+ g_free(prompt);
+ if (pass) {
+ nsspass = PORT_Strdup(pass);
+ g_free(pass);
+ }
+
+ return nsspass;
+}
+
/**
* camel_smime_context_new:
* @session: session
@@ -108,10 +143,62 @@ camel_smime_context_set_sign_mode(CamelSMIMEContext *context, camel_smime_sign_t
context->priv->sign_mode = type;
}
+/* TODO: This is suboptimal, but the only other solution is to pass around NSSCMSMessages */
guint32
camel_smime_context_describe_part(CamelSMIMEContext *context, CamelMimePart *part)
{
- return 0;
+ guint32 flags = 0;
+ CamelContentType *ct;
+ const char *tmp;
+
+ ct = camel_mime_part_get_content_type(part);
+
+ if (camel_content_type_is(ct, "multipart", "signed")) {
+ tmp = camel_content_type_param(ct, "protocol");
+ if (tmp && g_ascii_strcasecmp(tmp, ((CamelCipherContext *)context)->sign_protocol))
+ flags = CAMEL_SMIME_SIGNED;
+ } else if (camel_content_type_is(ct, "application", "x-pkcs7-mime")) {
+ CamelStreamMem *istream;
+ NSSCMSMessage *cmsg;
+ NSSCMSDecoderContext *dec;
+
+ /* FIXME: stream this to the decoder incrementally */
+ istream = (CamelStreamMem *)camel_stream_mem_new();
+ camel_data_wrapper_decode_to_stream(camel_medium_get_content_object((CamelMedium *)part), (CamelStream *)istream);
+ camel_stream_reset((CamelStream *)istream);
+
+ dec = NSS_CMSDecoder_Start(NULL,
+ NULL, NULL,
+ sm_get_passwd, context, /* password callback */
+ NULL, NULL); /* decrypt key callback */
+
+ NSS_CMSDecoder_Update(dec, istream->buffer->data, istream->buffer->len);
+ camel_object_unref(istream);
+
+ cmsg = NSS_CMSDecoder_Finish(dec);
+ if (cmsg) {
+ if (NSS_CMSMessage_IsSigned(cmsg)) {
+ printf("message is signed\n");
+ flags |= CAMEL_SMIME_SIGNED;
+ }
+
+ if (NSS_CMSMessage_IsEncrypted(cmsg)) {
+ printf("message is encrypted\n");
+ flags |= CAMEL_SMIME_ENCRYPTED;
+ }
+#if 0
+ if (NSS_CMSMessage_ContainsCertsOrCrls(cmsg)) {
+ printf("message contains certs or crls\n");
+ flags |= CAMEL_SMIME_CERTS;
+ }
+#endif
+ NSS_CMSMessage_Destroy(cmsg);
+ } else {
+ printf("Message could not be parsed\n");
+ }
+ }
+
+ return flags;
}
static const char *
@@ -141,41 +228,6 @@ sm_id_to_hash(CamelCipherContext *context, const char *id)
return CAMEL_CIPHER_HASH_DEFAULT;
}
-/* used for decode content callback, for streaming decode */
-static void
-sm_write_stream(void *arg, const char *buf, unsigned long len)
-{
- camel_stream_write((CamelStream *)arg, buf, len);
-}
-
-static PK11SymKey *
-sm_decrypt_key(void *arg, SECAlgorithmID *algid)
-{
- printf("Decrypt key called\n");
- return (PK11SymKey *)arg;
-}
-
-static char *
-sm_get_passwd(PK11SlotInfo *info, PRBool retry, void *arg)
-{
- CamelSMIMEContext *context = arg;
- char *pass, *nsspass = NULL;
- char *prompt;
- CamelException *ex;
-
- ex = camel_exception_new();
- prompt = g_strdup_printf(_("Enter security pass-phrase for `%s'"), PK11_GetTokenName(info));
- pass = camel_session_get_password(((CamelCipherContext *)context)->session, prompt, FALSE, TRUE, NULL, PK11_GetTokenName(info), ex);
- camel_exception_free(ex);
- g_free(prompt);
- if (pass) {
- nsspass = PORT_Strdup(pass);
- g_free(pass);
- }
-
- return nsspass;
-}
-
static NSSCMSMessage *
sm_signing_cmsmessage(CamelSMIMEContext *context, const char *nick, SECOidTag hash, int detached, CamelException *ex)
{
@@ -346,7 +398,10 @@ sm_sign(CamelCipherContext *context, const char *userid, CamelCipherHash hash, C
/* FIXME: stream this, we stream output at least */
istream = camel_stream_mem_new();
- if (camel_cipher_canonical_to_stream(ipart, istream) == -1) {
+ 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;
@@ -466,11 +521,9 @@ sm_status_description(NSSCMSVerificationStatus status)
}
static CamelCipherValidity *
-sm_verify(CamelCipherContext *context, CamelCipherHash hash, CamelStream *istream, CamelMimePart *sigpart, CamelException *ex)
+sm_verify_cmsg(CamelCipherContext *context, NSSCMSMessage *cmsg, CamelMimePart *extpart, CamelException *ex)
{
struct _CamelSMIMEContextPrivate *p = ((CamelSMIMEContext *)context)->priv;
- NSSCMSDecoderContext *dec;
- NSSCMSMessage *cmsg;
NSSCMSSignedData *sigd = NULL;
NSSCMSEnvelopedData *envd;
NSSCMSEncryptedData *encd;
@@ -484,22 +537,6 @@ sm_verify(CamelCipherContext *context, CamelCipherHash hash, CamelStream *istrea
CamelCipherValidity *valid;
GString *description;
- dec = NSS_CMSDecoder_Start(NULL,
- NULL, NULL, /* content callback */
- sm_get_passwd, context, /* password callback */
- NULL, NULL); /* decrypt key callback */
-
- /* FIXME: Stream? not worth it? sigs are small */
- mem = (CamelStreamMem *)camel_stream_mem_new();
- camel_data_wrapper_decode_to_stream(camel_medium_get_content_object((CamelMedium *)sigpart), (CamelStream *)mem);
- (void)NSS_CMSDecoder_Update(dec, mem->buffer->data, mem->buffer->len);
- camel_object_unref(mem);
- cmsg = NSS_CMSDecoder_Finish(dec);
- if (cmsg == NULL) {
- camel_exception_setv(ex, 1, "Decoder failed");
- return NULL;
- }
-
description = g_string_new("");
valid = camel_cipher_validity_new();
camel_cipher_validity_set_valid(valid, TRUE);
@@ -522,6 +559,11 @@ sm_verify(CamelCipherContext *context, CamelCipherHash hash, CamelStream *istrea
/* need to build digests of the content */
if (!NSS_CMSSignedData_HasDigests(sigd)) {
+ if (extpart == NULL) {
+ camel_exception_setv(ex, 1, "Digests missing from enveloped data");
+ goto fail;
+ }
+
if ((poolp = PORT_NewArena(1024)) == NULL) {
camel_exception_setv(ex, 1, "out of memory");
goto fail;
@@ -536,12 +578,12 @@ sm_verify(CamelCipherContext *context, CamelCipherHash hash, CamelStream *istrea
}
mem = (CamelStreamMem *)camel_stream_mem_new();
- camel_stream_write_to_stream(istream, (CamelStream *)mem);
+ camel_cipher_canonical_to_stream(extpart, CAMEL_MIME_FILTER_CANON_CRLF, (CamelStream *)mem);
NSS_CMSDigestContext_Update(digcx, mem->buffer->data, mem->buffer->len);
camel_object_unref(mem);
if (NSS_CMSDigestContext_FinishMultiple(digcx, poolp, &digests) != SECSuccess) {
- camel_exception_setv(ex, 1, "Can not calculate digests");
+ camel_exception_setv(ex, 1, "Cannot calculate digests");
goto fail;
}
@@ -572,7 +614,6 @@ sm_verify(CamelCipherContext *context, CamelCipherHash hash, CamelStream *istrea
g_string_printf(description, "Certficate only message, certificates imported and verified");
}
} else {
-
if (!NSS_CMSSignedData_HasDigests(sigd)) {
camel_exception_setv(ex, 1, "Can't find signature digests");
goto fail;
@@ -606,7 +647,6 @@ sm_verify(CamelCipherContext *context, CamelCipherHash hash, CamelStream *istrea
break;
case SEC_OID_PKCS7_ENVELOPED_DATA:
envd = (NSSCMSEnvelopedData *)NSS_CMSContentInfo_GetContent(cinfo);
- /* do we need to look into the enveloped data for signatures too?? */
break;
case SEC_OID_PKCS7_ENCRYPTED_DATA:
encd = (NSSCMSEncryptedData *)NSS_CMSContentInfo_GetContent(cinfo);
@@ -622,20 +662,74 @@ sm_verify(CamelCipherContext *context, CamelCipherHash hash, CamelStream *istrea
camel_cipher_validity_set_description(valid, description->str);
g_string_free(description, TRUE);
- NSS_CMSMessage_Destroy(cmsg);
return valid;
fail:
- NSS_CMSMessage_Destroy(cmsg);
camel_cipher_validity_free(valid);
g_string_free(description, TRUE);
- if (poolp)
- PORT_FreeArena(poolp, PR_FALSE);
-
return NULL;
}
+static CamelCipherValidity *
+sm_verify(CamelCipherContext *context, CamelMimePart *ipart, CamelException *ex)
+{
+ NSSCMSDecoderContext *dec;
+ NSSCMSMessage *cmsg;
+ CamelStreamMem *mem;
+ CamelCipherValidity *valid;
+ CamelContentType *ct;
+ const char *tmp;
+ CamelMimePart *extpart, *sigpart;
+
+ ct = camel_mime_part_get_content_type(ipart);
+ if (camel_content_type_is(ct, "multipart", "signed")) {
+ CamelMultipart *mps = (CamelMultipart *)camel_medium_get_content_object((CamelMedium *)ipart);
+
+ tmp = camel_content_type_param(ct, "protocol");
+ extpart = camel_multipart_get_part(mps, CAMEL_MULTIPART_SIGNED_CONTENT);
+ sigpart = camel_multipart_get_part(mps, CAMEL_MULTIPART_SIGNED_SIGNATURE);
+ if (!CAMEL_IS_MULTIPART_SIGNED(mps)
+ || tmp == NULL
+ || g_ascii_strcasecmp(tmp, context->sign_protocol) != 0
+ || extpart == NULL
+ || sigpart == NULL) {
+ camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+ _("Cannot verify message signature: Incorrect message format"));
+ return NULL;
+ }
+ } else if (camel_content_type_is(ct, "application", "x-pkcs7-mime")) {
+ extpart = NULL;
+ sigpart = ipart;
+ } else {
+ camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+ _("Cannot verify message signature: Incorrect message format"));
+ return NULL;
+ }
+
+ dec = NSS_CMSDecoder_Start(NULL,
+ NULL, NULL, /* content callback */
+ sm_get_passwd, context, /* password callback */
+ NULL, NULL); /* decrypt key callback */
+
+ /* FIXME: we should stream this to the decoder */
+ mem = (CamelStreamMem *)camel_stream_mem_new();
+ camel_data_wrapper_decode_to_stream(camel_medium_get_content_object((CamelMedium *)sigpart), (CamelStream *)mem);
+ (void)NSS_CMSDecoder_Update(dec, mem->buffer->data, mem->buffer->len);
+ camel_object_unref(mem);
+ cmsg = NSS_CMSDecoder_Finish(dec);
+ if (cmsg == NULL) {
+ camel_exception_setv(ex, 1, "Decoder failed");
+ return NULL;
+ }
+
+ valid = sm_verify_cmsg(context, cmsg, extpart, ex);
+
+ NSS_CMSMessage_Destroy(cmsg);
+
+ return valid;
+}
+
static int
sm_encrypt(CamelCipherContext *context, const char *userid, GPtrArray *recipients, CamelMimePart *ipart, CamelMimePart *opart, CamelException *ex)
{
@@ -812,14 +906,14 @@ fail:
return -1;
}
-static CamelMimePart *
-sm_decrypt(CamelCipherContext *context, CamelMimePart *ipart, CamelException *ex)
+static CamelCipherValidity *
+sm_decrypt(CamelCipherContext *context, CamelMimePart *ipart, CamelMimePart *opart, CamelException *ex)
{
NSSCMSDecoderContext *dec;
NSSCMSMessage *cmsg;
CamelStreamMem *istream;
CamelStream *ostream;
- CamelMimePart *opart = NULL;
+ CamelCipherValidity *valid = NULL;
/* FIXME: This assumes the content is only encrypted. Perhaps its ok for
this api to do this ... */
@@ -856,15 +950,22 @@ sm_decrypt(CamelCipherContext *context, CamelMimePart *ipart, CamelException *ex
}
#endif
- NSS_CMSMessage_Destroy(cmsg);
-
- opart = camel_mime_part_new();
camel_stream_reset(ostream);
camel_data_wrapper_construct_from_stream((CamelDataWrapper *)opart, ostream);
+
+ if (NSS_CMSMessage_IsSigned(cmsg)) {
+ valid = sm_verify_cmsg(context, cmsg, NULL, ex);
+ } else {
+ valid = camel_cipher_validity_new();
+ valid->encrypt.description = g_strdup(_("Encrypted content"));
+ valid->encrypt.status = CAMEL_CIPHER_VALIDITY_ENCRYPT_ENCRYPTED;
+ }
+
+ NSS_CMSMessage_Destroy(cmsg);
fail:
camel_object_unref(ostream);
- return opart;
+ return valid;
}
static int