1 files changed, 374 insertions, 0 deletions
diff --git a/src/pgp/gpg.c b/src/pgp/gpg.c
new file mode 100644
index 00000000..87bd370c
--- /dev/null
+++ b/src/pgp/gpg.c
@@ -0,0 +1,374 @@
+/*
+ * gpg.c
+ *
+ * Copyright (C) 2012 - 2015 James Booth <boothj5@gmail.com>
+ *
+ * This file is part of Profanity.
+ *
+ * Profanity is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Profanity is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Profanity.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link the code of portions of this program with the OpenSSL library under
+ * certain conditions as described in each individual source file, and
+ * distribute linked combinations including the two.
+ *
+ * You must obey the GNU General Public License in all respects for all of the
+ * code used other than OpenSSL. If you modify file(s) with this exception, you
+ * may extend this exception to your version of the file(s), but you are not
+ * obligated to do so. If you do not wish to do so, delete this exception
+ * statement from your version. If you delete this exception statement from all
+ * source files in the program, then also delete it here.
+ *
+ */
+
+#include <locale.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include <glib.h>
+#include <gpgme.h>
+
+#include "pgp/gpg.h"
+#include "log.h"
+
+#define PGP_SIGNATURE_HEADER "-----BEGIN PGP SIGNATURE-----"
+#define PGP_SIGNATURE_FOOTER "-----END PGP SIGNATURE-----"
+#define PGP_MESSAGE_HEADER "-----BEGIN PGP MESSAGE-----"
+#define PGP_MESSAGE_FOOTER "-----END PGP MESSAGE-----"
+
+static const char *libversion;
+static GHashTable *fingerprints;
+
+static char* _remove_header_footer(char *str, const char * const footer);
+static char* _add_header_footer(const char * const str, const char * const header, const char * const footer);
+
+void
+p_gpg_init(void)
+{
+    libversion = gpgme_check_version(NULL);
+    log_debug("GPG: Found gpgme version: %s", libversion);
+    gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
+
+    // TODO add close function to clean up
+    fingerprints = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
+}
+
+void
+p_gpg_close(void)
+{
+    g_hash_table_destroy(fingerprints);
+}
+
+GSList *
+p_gpg_list_keys(void)
+{
+    gpgme_error_t error;
+    gpgme_ctx_t ctx;
+    gpgme_key_t key;
+    GSList *result = NULL;
+
+    error = gpgme_new(&ctx);
+    if (error) {
+        log_error("GPG: Could not list keys. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        return NULL;
+    }
+
+    error = gpgme_op_keylist_start(ctx, NULL, 1);
+    if (error == GPG_ERR_NO_ERROR) {
+        while (!error) {
+            error = gpgme_op_keylist_next(ctx, &key);
+            if (error) {
+                break;
+            }
+
+            ProfPGPKey *p_pgpkey = malloc(sizeof(ProfPGPKey));
+            p_pgpkey->id = strdup(key->subkeys->keyid);
+            p_pgpkey->name = strdup(key->uids->uid);
+            p_pgpkey->fp = strdup(key->subkeys->fpr);
+
+            result = g_slist_append(result, p_pgpkey);
+
+            gpgme_key_release(key);
+        }
+    } else {
+        log_error("GPG: Could not list keys. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+    }
+
+    gpgme_release(ctx);
+
+    return result;
+}
+
+GHashTable *
+p_gpg_fingerprints(void)
+{
+    return fingerprints;
+}
+
+const char*
+p_gpg_libver(void)
+{
+    return libversion;
+}
+
+void
+p_gpg_free_key(ProfPGPKey *key)
+{
+    if (key) {
+        free(key->id);
+        free(key->name);
+        free(key->fp);
+        free(key);
+    }
+}
+
+void
+p_gpg_verify(const char * const barejid, const char *const sign)
+{
+    if (!sign) {
+        return;
+    }
+
+    gpgme_ctx_t ctx;
+    gpgme_error_t error = gpgme_new(&ctx);
+    if (error) {
+        log_error("GPG: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        return;
+    }
+
+    gpgme_data_t sign_data;
+    gpgme_data_t plain_data;
+    char *sign_with_header_footer = _add_header_footer(sign, PGP_SIGNATURE_HEADER, PGP_SIGNATURE_FOOTER);
+    gpgme_data_new_from_mem(&sign_data, sign_with_header_footer, strlen(sign_with_header_footer), 1);
+    gpgme_data_new(&plain_data);
+
+    error = gpgme_op_verify(ctx, sign_data, NULL, plain_data);
+    if (error) {
+        log_error("GPG: Failed to verify. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        gpgme_release(ctx);
+        return;
+    }
+
+    gpgme_verify_result_t result = gpgme_op_verify_result(ctx);
+    if (result) {
+        if (result->signatures) {
+            log_debug("Fingerprint found for %s: %s ", barejid, result->signatures->fpr);
+            g_hash_table_replace(fingerprints, strdup(barejid), strdup(result->signatures->fpr));
+        }
+    }
+
+    gpgme_data_release(sign_data);
+    gpgme_data_release(plain_data);
+}
+
+char*
+p_gpg_sign(const char * const str, const char * const fp)
+{
+    gpgme_ctx_t ctx;
+    gpgme_error_t error = gpgme_new(&ctx);
+    if (error) {
+        log_error("GPG: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        return NULL;
+    }
+
+    gpgme_key_t key = NULL;
+    error = gpgme_get_key(ctx, fp, &key, 1);
+    if (error || key == NULL) {
+        log_error("GPG: Failed to get key. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        gpgme_release (ctx);
+        return NULL;
+    }
+
+    gpgme_signers_clear(ctx);
+    error = gpgme_signers_add(ctx, key);
+    if (error) {
+        log_error("GPG: Failed to load signer. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        gpgme_release(ctx);
+        return NULL;
+    }
+
+    gpgme_data_t str_data;
+    gpgme_data_t signed_data;
+    char *str_or_empty = NULL;
+    if (str) {
+        str_or_empty = strdup(str);
+    } else {
+        str_or_empty = strdup("");
+    }
+    gpgme_data_new_from_mem(&str_data, str_or_empty, strlen(str_or_empty), 1);
+    gpgme_data_new(&signed_data);
+
+    gpgme_set_armor(ctx,1);
+    error = gpgme_op_sign(ctx,str_data,signed_data,GPGME_SIG_MODE_DETACH);
+    if (error) {
+        log_error("GPG: Failed to sign string. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        gpgme_release(ctx);
+        return NULL;
+    }
+
+    char *result = NULL;
+    gpgme_data_release(str_data);
+
+    size_t len = 0;
+    char *signed_str = gpgme_data_release_and_get_mem(signed_data, &len);
+    if (signed_str) {
+        signed_str[len] = 0;
+        result = _remove_header_footer(signed_str, PGP_SIGNATURE_FOOTER);
+    }
+    gpgme_free(signed_str);
+    gpgme_release(ctx);
+    free(str_or_empty);
+
+    return result;
+}
+
+char *
+p_gpg_encrypt(const char * const barejid, const char * const message)
+{
+    char *fp = g_hash_table_lookup(fingerprints, barejid);
+
+    if (!fp) {
+        return NULL;
+    }
+
+    gpgme_key_t keys[2];
+
+    keys[0] = NULL;
+    keys[1] = NULL;
+
+    gpgme_ctx_t ctx;
+    gpgme_error_t error = gpgme_new(&ctx);
+    if (error) {
+        log_error("GPG: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        return NULL;
+    }
+
+    gpgme_key_t key;
+    error = gpgme_get_key(ctx, fp, &key, 0);
+    if (error || key == NULL) {
+        log_error("GPG: Failed to get key. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        gpgme_release(ctx);
+        return NULL;
+    }
+
+    keys[0] = key;
+
+    gpgme_data_t plain;
+    gpgme_data_t cipher;
+    gpgme_data_new_from_mem(&plain, message, strlen(message), 1);
+    gpgme_data_new(&cipher);
+
+    gpgme_set_armor(ctx, 1);
+    error = gpgme_op_encrypt(ctx, keys, GPGME_ENCRYPT_ALWAYS_TRUST, plain, cipher);
+    if (error) {
+        log_error("GPG: Failed to encrypt message. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        gpgme_release(ctx);
+        return NULL;
+    }
+    gpgme_data_release(plain);
+
+    char *cipher_str = NULL;
+    char *result = NULL;
+    size_t len;
+    cipher_str = gpgme_data_release_and_get_mem(cipher, &len);
+    if (cipher_str) {
+        result = _remove_header_footer(cipher_str, PGP_MESSAGE_FOOTER);
+    }
+
+    gpgme_free(cipher_str);
+    gpgme_release(ctx);
+
+    return result;
+}
+
+char *
+p_gpg_decrypt(const char * const barejid, const char * const cipher)
+{
+    char *cipher_with_headers = _add_header_footer(cipher, PGP_MESSAGE_HEADER, PGP_MESSAGE_FOOTER);
+
+    gpgme_ctx_t ctx;
+    gpgme_error_t error = gpgme_new(&ctx);
+    if (error) {
+        log_error("GPG: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        return NULL;
+    }
+
+    gpgme_data_t plain_data;
+    gpgme_data_t cipher_data;
+    gpgme_data_new_from_mem (&cipher_data, cipher_with_headers, strlen(cipher_with_headers), 1);
+    gpgme_data_new(&plain_data);
+
+    error = gpgme_op_decrypt(ctx, cipher_data, plain_data);
+    if (error) {
+        log_error("GPG: Failed to encrypt message. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        gpgme_release(ctx);
+        return NULL;
+    }
+
+    gpgme_data_release(cipher_data);
+
+    size_t len = 0;
+    char *plain_str = gpgme_data_release_and_get_mem(plain_data, &len);
+    char *result = NULL;
+    if (plain_str) {
+        plain_str[len] = 0;
+        result = g_strdup(plain_str);
+    }
+    gpgme_free(plain_str);
+
+    gpgme_release(ctx);
+
+    return result;
+}
+
+static char*
+_remove_header_footer(char *str, const char * const footer)
+{
+    int pos = 0;
+    int newlines = 0;
+
+    while (newlines < 3) {
+        if (str[pos] == '\n') {
+            newlines++;
+        }
+        pos++;
+
+        if (str[pos] == '\0') {
+            return NULL;
+        }
+    }
+
+    char *stripped = strdup(&str[pos]);
+    char *footer_start = g_strrstr(stripped, footer);
+    footer_start[0] = '\0';
+
+    return stripped;
+}
+
+static char*
+_add_header_footer(const char * const str, const char * const header, const char * const footer)
+{
+    GString *result_str = g_string_new("");
+
+    g_string_append(result_str, header);
+    g_string_append(result_str, "\n\n");
+    g_string_append(result_str, str);
+    g_string_append(result_str, "\n");
+    g_string_append(result_str, footer);
+
+    char *result = result_str->str;
+    g_string_free(result_str, FALSE);
+
+    return result;
+}