From: Jani Nikula Date: Sat, 30 Mar 2013 13:53:16 +0000 (+0200) Subject: cli: mime node: abstract decryption and signature verification X-Git-Tag: 0.16_rc1~160 X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=commitdiff_plain;h=d487ef9e58bcd193118f19f771d5ef3984616be5;hp=8c6fd797952d38e03d46fd6b57bd6a1a63474de8 cli: mime node: abstract decryption and signature verification The code filled with #ifdef GMIME_ATLEAST_26 is difficult to read. Abstract the decryption and signature verification into functions, with separate implementations for GMime 2.4 and 2.6, to clarify the code. There should be no functional changes. --- diff --git a/mime-node.c b/mime-node.c index 839737a8..851f963b 100644 --- a/mime-node.c +++ b/mime-node.c @@ -130,26 +130,163 @@ DONE: } #ifdef GMIME_ATLEAST_26 + +/* Signature list destructor (GMime 2.6) */ static int _signature_list_free (GMimeSignatureList **proxy) { g_object_unref (*proxy); return 0; } -#else + +/* Set up signature list destructor (GMime 2.6) */ +static void +set_signature_list_destructor (mime_node_t *node) +{ + GMimeSignatureList **proxy = talloc (node, GMimeSignatureList *); + if (proxy) { + *proxy = node->sig_list; + talloc_set_destructor (proxy, _signature_list_free); + } +} + +/* Verify a signed mime node (GMime 2.6) */ +static void +node_verify (mime_node_t *node, GMimeObject *part, + notmuch_crypto_context_t *cryptoctx) +{ + GError *err = NULL; + + node->verify_attempted = TRUE; + node->sig_list = g_mime_multipart_signed_verify + (GMIME_MULTIPART_SIGNED (part), cryptoctx, &err); + + if (node->sig_list) + set_signature_list_destructor (node); + else + fprintf (stderr, "Failed to verify signed part: %s\n", + err ? err->message : "no error explanation given"); + + if (err) + g_error_free (err); +} + +/* Decrypt and optionally verify an encrypted mime node (GMime 2.6) */ +static void +node_decrypt_and_verify (mime_node_t *node, GMimeObject *part, + notmuch_crypto_context_t *cryptoctx) +{ + GError *err = NULL; + GMimeDecryptResult *decrypt_result = NULL; + GMimeMultipartEncrypted *encrypteddata = GMIME_MULTIPART_ENCRYPTED (part); + + node->decrypt_attempted = TRUE; + node->decrypted_child = g_mime_multipart_encrypted_decrypt + (encrypteddata, cryptoctx, &decrypt_result, &err); + if (! node->decrypted_child) { + fprintf (stderr, "Failed to decrypt part: %s\n", + err ? err->message : "no error explanation given"); + goto DONE; + } + + node->decrypt_success = TRUE; + node->verify_attempted = TRUE; + + /* This may be NULL if the part is not signed. */ + node->sig_list = g_mime_decrypt_result_get_signatures (decrypt_result); + if (node->sig_list) { + g_object_ref (node->sig_list); + set_signature_list_destructor (node); + } + g_object_unref (decrypt_result); + + DONE: + if (err) + g_error_free (err); +} + +#else /* GMIME_ATLEAST_26 */ + +/* Signature validity destructor (GMime 2.4) */ static int _signature_validity_free (GMimeSignatureValidity **proxy) { g_mime_signature_validity_free (*proxy); return 0; } -#endif + +/* Set up signature validity destructor (GMime 2.4) */ +static void +set_signature_validity_destructor (mime_node_t *node) +{ + GMimeSignatureValidity **proxy = talloc (node, GMimeSignatureValidity *); + if (proxy) { + *proxy = node->sig_validity; + talloc_set_destructor (proxy, _signature_validity_free); + } +} + +/* Verify a signed mime node (GMime 2.4) */ +static void +node_verify (mime_node_t *node, GMimeObject *part, + notmuch_crypto_context_t *cryptoctx) +{ + GError *err = NULL; + + node->verify_attempted = TRUE; + node->sig_validity = g_mime_multipart_signed_verify + (GMIME_MULTIPART_SIGNED (part), cryptoctx, &err); + if (node->sig_validity) { + set_signature_validity_destructor (node); + } else { + fprintf (stderr, "Failed to verify signed part: %s\n", + err ? err->message : "no error explanation given"); + } + + if (err) + g_error_free (err); +} + +/* Decrypt and optionally verify an encrypted mime node (GMime 2.4) */ +static void +node_decrypt_and_verify (mime_node_t *node, GMimeObject *part, + notmuch_crypto_context_t *cryptoctx) +{ + GError *err = NULL; + GMimeMultipartEncrypted *encrypteddata = GMIME_MULTIPART_ENCRYPTED (part); + + node->decrypt_attempted = TRUE; + node->decrypted_child = g_mime_multipart_encrypted_decrypt + (encrypteddata, cryptoctx, &err); + if (! node->decrypted_child) { + fprintf (stderr, "Failed to decrypt part: %s\n", + err ? err->message : "no error explanation given"); + goto DONE; + } + + node->decrypt_success = TRUE; + node->verify_attempted = TRUE; + + /* The GMimeSignatureValidity returned here is a const, unlike the + * one returned by g_mime_multipart_signed_verify() in + * node_verify() above, so the destructor is not needed. + */ + node->sig_validity = g_mime_multipart_encrypted_get_signature_validity (encrypteddata); + if (! node->sig_validity) + fprintf (stderr, "Failed to verify encrypted signed part: %s\n", + err ? err->message : "no error explanation given"); + + DONE: + if (err) + g_error_free (err); +} + +#endif /* GMIME_ATLEAST_26 */ static mime_node_t * _mime_node_create (mime_node_t *parent, GMimeObject *part) { mime_node_t *node = talloc_zero (parent, mime_node_t); - GError *err = NULL; notmuch_crypto_context_t *cryptoctx = NULL; /* Set basic node properties */ @@ -198,32 +335,7 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part) "message (must be exactly 2)\n", node->nchildren); } else { - GMimeMultipartEncrypted *encrypteddata = - GMIME_MULTIPART_ENCRYPTED (part); - node->decrypt_attempted = TRUE; -#ifdef GMIME_ATLEAST_26 - GMimeDecryptResult *decrypt_result = NULL; - node->decrypted_child = g_mime_multipart_encrypted_decrypt - (encrypteddata, cryptoctx, &decrypt_result, &err); -#else - node->decrypted_child = g_mime_multipart_encrypted_decrypt - (encrypteddata, cryptoctx, &err); -#endif - if (node->decrypted_child) { - node->decrypt_success = node->verify_attempted = TRUE; -#ifdef GMIME_ATLEAST_26 - /* This may be NULL if the part is not signed. */ - node->sig_list = g_mime_decrypt_result_get_signatures (decrypt_result); - if (node->sig_list) - g_object_ref (node->sig_list); - g_object_unref (decrypt_result); -#else - node->sig_validity = g_mime_multipart_encrypted_get_signature_validity (encrypteddata); -#endif - } else { - fprintf (stderr, "Failed to decrypt part: %s\n", - (err ? err->message : "no error explanation given")); - } + node_decrypt_and_verify (node, part, cryptoctx); } } else if (GMIME_IS_MULTIPART_SIGNED (part) && node->ctx->crypto->verify && cryptoctx) { if (node->nchildren != 2) { @@ -232,56 +344,10 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part) "(must be exactly 2)\n", node->nchildren); } else { -#ifdef GMIME_ATLEAST_26 - node->sig_list = g_mime_multipart_signed_verify - (GMIME_MULTIPART_SIGNED (part), cryptoctx, &err); - node->verify_attempted = TRUE; - - if (!node->sig_list) - fprintf (stderr, "Failed to verify signed part: %s\n", - (err ? err->message : "no error explanation given")); -#else - /* For some reason the GMimeSignatureValidity returned - * here is not a const (inconsistent with that - * returned by - * g_mime_multipart_encrypted_get_signature_validity, - * and therefore needs to be properly disposed of. - * - * In GMime 2.6, they're both non-const, so we'll be able - * to clean up this asymmetry. */ - GMimeSignatureValidity *sig_validity = g_mime_multipart_signed_verify - (GMIME_MULTIPART_SIGNED (part), cryptoctx, &err); - node->verify_attempted = TRUE; - node->sig_validity = sig_validity; - if (sig_validity) { - GMimeSignatureValidity **proxy = - talloc (node, GMimeSignatureValidity *); - *proxy = sig_validity; - talloc_set_destructor (proxy, _signature_validity_free); - } -#endif + node_verify (node, part, cryptoctx); } } -#ifdef GMIME_ATLEAST_26 - /* sig_list may be created in both above cases, so we need to - * cleanly handle it here. */ - if (node->sig_list) { - GMimeSignatureList **proxy = talloc (node, GMimeSignatureList *); - *proxy = node->sig_list; - talloc_set_destructor (proxy, _signature_list_free); - } -#endif - -#ifndef GMIME_ATLEAST_26 - if (node->verify_attempted && !node->sig_validity) - fprintf (stderr, "Failed to verify signed part: %s\n", - (err ? err->message : "no error explanation given")); -#endif - - if (err) - g_error_free (err); - return node; }