[PATCH v4 03/16] make shared crypto code behave library-like
Daniel Kahn Gillmor
dkg at fifthhorseman.net
Fri Jul 8 02:27:14 PDT 2016
If we're going to reuse the crypto code across both the library and
the client, then it needs to report error states properly and not
write to stderr.
---
lib/database.cc | 6 ++++
lib/notmuch.h | 17 +++++++++++
mime-node.c | 7 ++++-
util/crypto.c | 89 ++++++++++++++++++++++++++++-----------------------------
util/crypto.h | 6 ++--
5 files changed, 76 insertions(+), 49 deletions(-)
diff --git a/lib/database.cc b/lib/database.cc
index 3bdbd07..9d6b6f2 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -369,6 +369,12 @@ notmuch_status_to_string (notmuch_status_t status)
return "Operation requires a database upgrade";
case NOTMUCH_STATUS_PATH_ERROR:
return "Path supplied is illegal for this function";
+ case NOTMUCH_STATUS_MALFORMED_CRYPTO_PROTOCOL:
+ return "Crypto protocol missing, malformed, or unintelligible";
+ case NOTMUCH_STATUS_FAILED_CRYPTO_CONTEXT_CREATION:
+ return "Crypto engine initialization failure";
+ case NOTMUCH_STATUS_UNKNOWN_CRYPTO_PROTOCOL:
+ return "Unknown crypto protocol";
default:
case NOTMUCH_STATUS_LAST_STATUS:
return "Unknown error status value";
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 0d667f5..aaed516 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -185,6 +185,23 @@ typedef enum _notmuch_status {
*/
NOTMUCH_STATUS_ILLEGAL_ARGUMENT,
/**
+ * A MIME object claimed to have cryptographic protection which
+ * notmuch tried to handle, but the protocol was not specified in
+ * an intelligible way.
+ */
+ NOTMUCH_STATUS_MALFORMED_CRYPTO_PROTOCOL,
+ /**
+ * Notmuch attempted to do crypto processing, but could not
+ * initialize the engine needed to do so.
+ */
+ NOTMUCH_STATUS_FAILED_CRYPTO_CONTEXT_CREATION,
+ /**
+ * A MIME object claimed to have cryptographic protection, and
+ * notmuch attempted to process it, but the specific protocol was
+ * something that notmuch doesn't know how to handle.
+ */
+ NOTMUCH_STATUS_UNKNOWN_CRYPTO_PROTOCOL,
+ /**
* Not an actual status value. Just a way to find out how many
* valid status values there are.
*/
diff --git a/mime-node.c b/mime-node.c
index 14873ce..717a122 100644
--- a/mime-node.c
+++ b/mime-node.c
@@ -244,7 +244,12 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part)
|| (GMIME_IS_MULTIPART_SIGNED (part) && node->ctx->crypto->verify)) {
GMimeContentType *content_type = g_mime_object_get_content_type (part);
const char *protocol = g_mime_content_type_get_parameter (content_type, "protocol");
- cryptoctx = _notmuch_crypto_get_gmime_context (node->ctx->crypto, protocol);
+ notmuch_status_t status;
+ status = _notmuch_crypto_get_gmime_ctx_for_protocol (node->ctx->crypto,
+ protocol, &cryptoctx);
+ if (status) /* this is a warning, not an error */
+ fprintf (stderr, "Warning: %s (%s).\n", notmuch_status_to_string (status),
+ protocol ? protocol : "(NULL)");
}
/* Handle PGP/MIME parts */
diff --git a/util/crypto.c b/util/crypto.c
index 48c20bb..cce5cbc 100644
--- a/util/crypto.c
+++ b/util/crypto.c
@@ -25,86 +25,86 @@
#define ARRAY_SIZE(arr) (sizeof (arr) / sizeof (arr[0]))
-/* Create a GPG context (GMime 2.6) */
-static GMimeCryptoContext*
-create_gpg_context (_notmuch_crypto_t *crypto)
+/* Create or pass on a GPG context (GMime 2.6) */
+static notmuch_status_t
+get_gpg_context (_notmuch_crypto_t *crypto, GMimeCryptoContext **ctx)
{
- GMimeCryptoContext *gpgctx;
+ if (ctx == NULL || crypto == NULL)
+ return NOTMUCH_STATUS_NULL_POINTER;
if (crypto->gpgctx) {
- return crypto->gpgctx;
+ *ctx = crypto->gpgctx;
+ return NOTMUCH_STATUS_SUCCESS;
}
/* TODO: GMimePasswordRequestFunc */
- gpgctx = g_mime_gpg_context_new (NULL, crypto->gpgpath ? crypto->gpgpath : "gpg");
- if (! gpgctx) {
- fprintf (stderr, "Failed to construct gpg context.\n");
- return NULL;
+ crypto->gpgctx = g_mime_gpg_context_new (NULL, crypto->gpgpath ? crypto->gpgpath : "gpg");
+ if (! crypto->gpgctx) {
+ return NOTMUCH_STATUS_FAILED_CRYPTO_CONTEXT_CREATION;
}
- crypto->gpgctx = gpgctx;
- g_mime_gpg_context_set_use_agent ((GMimeGpgContext *) gpgctx, TRUE);
- g_mime_gpg_context_set_always_trust ((GMimeGpgContext *) gpgctx, FALSE);
+ g_mime_gpg_context_set_use_agent ((GMimeGpgContext *) crypto->gpgctx, TRUE);
+ g_mime_gpg_context_set_always_trust ((GMimeGpgContext *) crypto->gpgctx, FALSE);
- return crypto->gpgctx;
+ *ctx = crypto->gpgctx;
+ return NOTMUCH_STATUS_SUCCESS;
}
-/* Create a PKCS7 context (GMime 2.6) */
-static notmuch_crypto_context_t *
-create_pkcs7_context (notmuch_crypto_t *crypto)
+/* Create or pass on a PKCS7 context (GMime 2.6) */
+static notmuch_status_t
+get_pkcs7_context (_notmuch_crypto_t *crypto, GMimeCryptoContext **ctx)
{
- notmuch_crypto_context_t *pkcs7ctx;
+ if (ctx == NULL || crypto == NULL)
+ return NOTMUCH_STATUS_NULL_POINTER;
- if (crypto->pkcs7ctx)
- return crypto->pkcs7ctx;
+ if (crypto->pkcs7ctx) {
+ *ctx = crypto->pkcs7ctx;
+ return NOTMUCH_STATUS_SUCCESS;
+ }
/* TODO: GMimePasswordRequestFunc */
- pkcs7ctx = g_mime_pkcs7_context_new (NULL);
- if (! pkcs7ctx) {
- fprintf (stderr, "Failed to construct pkcs7 context.\n");
- return NULL;
+ crypto->pkcs7ctx = g_mime_pkcs7_context_new (NULL);
+ if (! crypto->pkcs7ctx) {
+ return NOTMUCH_STATUS_FAILED_CRYPTO_CONTEXT_CREATION;
}
- crypto->pkcs7ctx = pkcs7ctx;
- g_mime_pkcs7_context_set_always_trust ((GMimePkcs7Context *) pkcs7ctx,
+ g_mime_pkcs7_context_set_always_trust ((GMimePkcs7Context *) crypto->pkcs7ctx,
FALSE);
- return crypto->pkcs7ctx;
+ *ctx = crypto->pkcs7ctx;
+ return NOTMUCH_STATUS_SUCCESS;
}
static const struct {
const char *protocol;
- GMimeCryptoContext *(*get_context) (_notmuch_crypto_t *crypto);
+ notmuch_status_t (*get_context) (_notmuch_crypto_t *crypto, GMimeCryptoContext **ctx);
} protocols[] = {
{
.protocol = "application/pgp-signature",
- .get_context = create_gpg_context,
+ .get_context = get_gpg_context,
},
{
.protocol = "application/pgp-encrypted",
- .get_context = create_gpg_context,
+ .get_context = get_gpg_context,
},
{
.protocol = "application/pkcs7-signature",
- .get_context = create_pkcs7_context,
+ .get_context = get_pkcs7_context,
},
{
.protocol = "application/x-pkcs7-signature",
- .get_context = create_pkcs7_context,
+ .get_context = get_pkcs7_context,
},
};
/* for the specified protocol return the context pointer (initializing
* if needed) */
-GMimeCryptoContext *
-_notmuch_crypto_get_gmime_context (_notmuch_crypto_t *crypto, const char *protocol)
+notmuch_status_t
+_notmuch_crypto_get_gmime_ctx_for_protocol (_notmuch_crypto_t *crypto,
+ const char *protocol,
+ GMimeCryptoContext **ctx)
{
- GMimeCryptoContext *cryptoctx = NULL;
- size_t i;
-
- if (! protocol) {
- fprintf (stderr, "Cryptographic protocol is empty.\n");
- return cryptoctx;
- }
+ if (! protocol)
+ return NOTMUCH_STATUS_MALFORMED_CRYPTO_PROTOCOL;
/* As per RFC 1847 section 2.1: "the [protocol] value token is
* comprised of the type and sub-type tokens of the Content-Type".
@@ -112,15 +112,12 @@ _notmuch_crypto_get_gmime_context (_notmuch_crypto_t *crypto, const char *protoc
* parameter names as defined in this document are
* case-insensitive." Thus, we use strcasecmp for the protocol.
*/
- for (i = 0; i < ARRAY_SIZE (protocols); i++) {
+ for (size_t i = 0; i < ARRAY_SIZE (protocols); i++) {
if (strcasecmp (protocol, protocols[i].protocol) == 0)
- return protocols[i].get_context (crypto);
+ return protocols[i].get_context (crypto, ctx);
}
- fprintf (stderr, "Unknown or unsupported cryptographic protocol %s.\n",
- protocol);
-
- return NULL;
+ return NOTMUCH_STATUS_UNKNOWN_CRYPTO_PROTOCOL;
}
void
diff --git a/util/crypto.h b/util/crypto.h
index d4a51e8..7cb0a39 100644
--- a/util/crypto.h
+++ b/util/crypto.h
@@ -15,8 +15,10 @@ typedef struct _notmuch_crypto {
} _notmuch_crypto_t;
-GMimeCryptoContext *
-_notmuch_crypto_get_gmime_context (_notmuch_crypto_t *crypto, const char *protocol);
+notmuch_status_t
+_notmuch_crypto_get_gmime_ctx_for_protocol (_notmuch_crypto_t *crypto,
+ const char *protocol,
+ GMimeCryptoContext **ctx);
void
_notmuch_crypto_cleanup (_notmuch_crypto_t *crypto);
--
2.8.1
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