alx/mu4e
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

* crypto: decryption support (WIP)

Browse Source
This commit is contained in:
djcb
2012-07-22 19:39:17 +03:00
parent a75664b955
commit 5a92c8b58a
6 changed files with 352 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

257
lib/mu-msg-crypto.c
View File

@ -21,6 +21,8 @@
#include "config.h"
#endif /*HAVE_CONFIG_H*/
#include <string.h>
#include "mu-msg.h"
#include "mu-msg-priv.h"
#include "mu-msg-part.h"
@ -31,74 +33,138 @@
#include <gmime/gmime.h>
#include <gmime/gmime-multipart-signed.h>
static gboolean
dummy_password_requester (GMimeCryptoContext *ctx, const char *user_id,
const char* prompt_ctx, gboolean reprompt,
GMimeStream *response, GError **err)
{
g_print ("password requested\n");
return TRUE;
#define CALLBACK_DATA "callback-data"
struct _CallbackData {
MuMsgPartPasswordFunc pw_func;
gpointer user_data;
};
typedef struct _CallbackData CallbackData;
static gboolean
password_requester (GMimeCryptoContext *ctx, const char *user_id,
const char* prompt_ctx, gboolean reprompt,
GMimeStream *response, GError **err)
{
CallbackData *cbdata;
gchar *password;
ssize_t written;
cbdata = g_object_get_data (G_OBJECT(ctx), CALLBACK_DATA);
g_return_val_if_fail (cbdata, FALSE);
password = cbdata->pw_func (user_id, prompt_ctx, reprompt,
cbdata->user_data);
if (!password)
return FALSE;
written = g_mime_stream_write_string (response, password);
if (written != -1)
written = g_mime_stream_write_string (response, "\n");
if (written == -1)
mu_util_g_set_error (err, MU_ERROR_CRYPTO,
"writing password to mime stream failed");
if (g_mime_stream_flush (response) != 0)
g_printerr ("error flushing stream!\n");
memset (password, 0, strlen(password));
g_free (password);
return written != -1 ? TRUE : FALSE;
}
GMimeCryptoContext*
static char*
dummy_password_func (const char *user_id, const char *prompt_ctx,
gboolean reprompt, gpointer user_data)
{
g_print ("password requested for %s (%s) %s\n",
user_id, prompt_ctx, reprompt ? "again" : "");
return NULL;
}
static GMimeCryptoContext*
get_gpg_crypto_context (MuMsgOptions opts, GError **err)
{
GMimeCryptoContext *ctx;
GMimeCryptoContext *cctx;
const char *prog;
ctx = NULL;
cctx = NULL;
prog = g_getenv ("MU_GPG_PATH");
if (prog)
ctx = g_mime_gpg_context_new (
(GMimePasswordRequestFunc)dummy_password_requester,
prog);
cctx = g_mime_gpg_context_new (
(GMimePasswordRequestFunc)password_requester, prog);
else {
char *path;
path = g_find_program_in_path ("gpg");
if (path)
ctx = g_mime_gpg_context_new (
(GMimePasswordRequestFunc)dummy_password_requester,
path);
cctx = g_mime_gpg_context_new (
password_requester, path);
g_free (path);
}
if (!ctx) {
if (!cctx) {
mu_util_g_set_error (err, MU_ERROR,
"failed to get GPG crypto context");
return NULL;
}
g_mime_gpg_context_set_use_agent
(GMIME_GPG_CONTEXT(ctx),
opts & MU_MSG_OPTION_USE_AGENT);
g_mime_gpg_context_set_always_trust
(GMIME_GPG_CONTEXT(ctx), FALSE);
(GMIME_GPG_CONTEXT(cctx),
opts & MU_MSG_OPTION_USE_AGENT ? TRUE:FALSE);
g_mime_gpg_context_set_auto_key_retrieve
(GMIME_GPG_CONTEXT(ctx),
opts & MU_MSG_OPTION_AUTO_RETRIEVE_KEY);
(GMIME_GPG_CONTEXT(cctx),
opts & MU_MSG_OPTION_AUTO_RETRIEVE_KEY ? TRUE:FALSE);
g_mime_gpg_context_set_always_trust
(GMIME_GPG_CONTEXT(cctx), FALSE);
return ctx;
return cctx;
}
GMimeCryptoContext*
static GMimeCryptoContext*
get_pkcs7_crypto_context (MuMsgOptions opts, GError **err)
{
GMimeCryptoContext *ctx;
GMimeCryptoContext *cctx;
ctx = g_mime_pkcs7_context_new
((GMimePasswordRequestFunc)dummy_password_requester);
if (!ctx) {
cctx = g_mime_pkcs7_context_new (password_requester);
if (!cctx) {
mu_util_g_set_error (err, MU_ERROR,
"failed to get PKCS7 crypto context");
return NULL;
}
g_mime_pkcs7_context_set_always_trust
(GMIME_PKCS7_CONTEXT(ctx), FALSE);
(GMIME_PKCS7_CONTEXT(cctx), FALSE);
return ctx;
return cctx;
}
static GMimeCryptoContext*
get_crypto_context (MuMsgOptions opts, MuMsgPartPasswordFunc password_func,
gpointer user_data, GError **err)
{
CallbackData *cbdata;
GMimeCryptoContext *cctx;
if (opts & MU_MSG_OPTION_USE_PKCS7)
cctx = get_pkcs7_crypto_context (opts, err);
else
cctx = get_gpg_crypto_context (opts, err);
/* use gobject to pass data to the callback func */
cbdata = g_new0 (CallbackData, 1);
cbdata->pw_func = password_func;
cbdata->user_data = user_data;
g_object_set_data_full (G_OBJECT(cctx), CALLBACK_DATA,
cbdata, (GDestroyNotify)g_free);
return cctx;
}
@ -266,13 +332,11 @@ mu_msg_mime_sig_infos (GMimeMultipartSigned *sigmpart, MuMsgOptions opts,
return NULL; /* error */
}
if (opts & MU_MSG_OPTION_USE_PKCS7)
cctx = get_pkcs7_crypto_context (opts, err);
else
cctx = get_gpg_crypto_context (opts, err);
/* dummy is good, since we don't need a password when checking
* signatures */
cctx = get_crypto_context (opts, dummy_password_func, NULL, err);
/* return a fake siginfos with the error */
if (!cctx)
if (!cctx) /* return a fake siginfos with the error */
return error_sig_infos (); /* error */
sigs = g_mime_multipart_signed_verify (sigmpart, cctx, err);
@ -313,7 +377,7 @@ mu_msg_part_free_sig_infos (GSList *siginfos)
* - if not, the verdic is MU_MSG_PART_SIG_STATUS_UNKNOWN
*/
MuMsgPartSigStatus
mu_msg_mime_sig_infos_verdict (GSList *sig_infos)
mu_msg_part_sig_infos_verdict (GSList *sig_infos)
{
GSList *cur;
MuMsgPartSigStatus status;
@ -457,3 +521,120 @@ mu_msg_part_sig_info_to_string (MuMsgPartSigInfo *info)
return g_string_free (gstr, FALSE);
}
struct _MuMsgDecryptedPart {
GMimeObject *decrypted;
};
struct _PartData {
MuMsgPartDecryptForeachFunc func;
gpointer user_data;
GMimeCryptoContext *cctx;
GError *err;
};
typedef struct _PartData PartData;
static void
each_encpart (GMimeObject *parent, GMimeObject *part, PartData *pdata)
{
MuMsgDecryptedPart dpart;
if (pdata->err)
return;
if (!GMIME_IS_MULTIPART_ENCRYPTED (part))
return; /* nothing to do for this part */
dpart.decrypted =
g_mime_multipart_encrypted_decrypt (
GMIME_MULTIPART_ENCRYPTED(part),
pdata->cctx, NULL, &pdata->err);
if (!dpart.decrypted || pdata->err) {
if (!pdata->err)
mu_util_g_set_error
(&pdata->err,
MU_ERROR_CRYPTO,
"decryption failed");
return;
}
pdata->func (&dpart, pdata->user_data);
}
gboolean
mu_msg_part_decrypt_foreach (MuMsg *msg, MuMsgPartDecryptForeachFunc func,
MuMsgPartPasswordFunc password_func,
gpointer user_data, MuMsgOptions opts, GError **err)
{
PartData pdata;
g_return_val_if_fail (msg, FALSE);
g_return_val_if_fail (func, FALSE);
g_return_val_if_fail (password_func, FALSE);
if (!mu_msg_load_msg_file (msg, err))
return FALSE;
pdata.func = func;
pdata.user_data = user_data;
pdata.err = NULL;
pdata.cctx = get_crypto_context (opts, password_func,
user_data, err);
if (!pdata.cctx)
return FALSE;
g_mime_message_foreach (msg->_file->_mime_msg,
(GMimeObjectForeachFunc)each_encpart,
&pdata);
if (pdata.err) {
*err = pdata.err;
return FALSE;
}
g_object_unref (pdata.cctx);
return TRUE;
}
char*
mu_msg_decrypted_part_to_string (MuMsgDecryptedPart *dpart, GError **err)
{
GMimePart *part;
gboolean not_ok;
gchar *str;
g_return_val_if_fail (dpart, NULL);
if (!GMIME_IS_PART(dpart->decrypted)) {
mu_util_g_set_error (err, MU_ERROR_CRYPTO,
"wrong mime-type");
return NULL; /* can only convert parts to string*/
}
part = GMIME_PART(dpart->decrypted);
str = mu_msg_mime_part_to_string (part, &not_ok);
if (not_ok) {
g_free (str);
mu_util_g_set_error (err, MU_ERROR_CRYPTO,
"failed to convert part to string");
return NULL;
}
return str;
}
gboolean
mu_msg_decrypted_part_to_file (MuMsgDecryptedPart *dpart, const char *path,
GError **err)
{
g_return_val_if_fail (dpart, FALSE);
g_return_val_if_fail (path, FALSE);
return mu_msg_part_mime_save_object (dpart->decrypted, path, FALSE, FALSE,
err);
}