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/*
* Copyright (c) 2014 Ian Sutton <ian@kremlin.cc>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <unistd.h>
#include <limits.h>
#include <string.h>
#include <glib/gprintf.h>
#include <glib-unix.h>
#include <polkit/polkit.h>
#include "util.h"
const gint MAX_TOKENS = 20;
/* return must be g_free()'d */
gchar *get_file_sha256(const gchar *path) {
gchar *checksum;
GMappedFile *file;
GBytes *data;
GError *err = NULL;
file = g_mapped_file_new(path, FALSE, &err);
if(file) {
data = g_mapped_file_get_bytes(file);
g_mapped_file_unref(file);
checksum = g_compute_checksum_for_bytes(G_CHECKSUM_SHA256, data);
return checksum;
} else
return NULL;
}
/* return must be g_free()'d */
gchar *config_get(const gchar *path, gchar *key) {
gchar *content, **split_content, *cur, **cur_split, *ret;
GError *err;
int incr = 0;
gboolean breaker = TRUE;
ret = (gchar *) g_malloc0(4096);
if(!g_file_get_contents(path, &content, NULL, &err))
return NULL;
split_content = g_strsplit(content, "\n", MAX_TOKENS);
while(breaker && (cur = split_content[incr]) && (cur_split = g_strsplit(cur, "=", 2))) {
if(!g_strcmp0(key, cur_split[0])) {
g_strlcpy(ret, cur_split[1], 2048);
breaker = FALSE;
}
incr++;
g_strfreev(cur_split);
}
if(split_content)
g_strfreev(split_content);
if(content)
g_free(content);
return (ret ? ret : NULL);
}
gboolean config_set(const gchar *path, gchar *key, gchar *value) {
gchar *content, **split_content, *cur, **cur_split, *rewrite;
GError *err_set, *err_get;
gboolean ret = FALSE;
int incr = 0;
gboolean breaker = TRUE;
err_get = err_set = NULL;
if(!g_file_get_contents(path, &content, NULL, &err_get))
return FALSE;
split_content = g_strsplit(content, "\n", MAX_TOKENS);
while(breaker && (cur = split_content[incr]) && (cur_split = g_strsplit(cur, "=", 2))) {
if(!g_strcmp0(key, cur_split[0])) {
cur_split[1] = value;
split_content[incr] = g_strjoinv("=", cur_split);
ret = TRUE;
breaker = FALSE;
}
incr++;
}
if(ret) {
rewrite = g_strjoinv("\n", split_content);
ret = g_file_set_contents(path, rewrite, -1, &err_set);
g_free(rewrite);
}
if(cur_split)
g_strfreev(cur_split);
if(split_content)
g_strfreev(split_content);
if(content)
g_free(content);
return ret;
}
static gboolean is_valid_action(GList *action_list, const gchar *action) {
PolkitActionDescription *action_descr;
const gchar *action_descr_id;
GList *cur;
gboolean ret;
ret = FALSE;
cur = g_list_first(action_list);
while(cur && (action_descr = ((PolkitActionDescription *)(cur->data))) && (action_descr_id = polkit_action_description_get_action_id(action_descr))) {
if(!g_strcmp0(action, action_descr_id)) {
ret = TRUE;
break;
}
cur = cur->next;
}
g_list_free(action_list);
return ret;
}
check_auth_result polkit_try_auth(const gchar *bus, const gchar *action, gboolean prompt) {
GList *valid_actions;
PolkitAuthority *auth;
PolkitSubject *subj;
PolkitAuthorizationResult *result;
PolkitCheckAuthorizationFlags prompt_flag;
gboolean authorized, challenge;
auth = NULL;
subj = NULL;
result = NULL;
valid_actions = NULL;
authorized = challenge = FALSE;
prompt_flag = prompt ? POLKIT_CHECK_AUTHORIZATION_FLAGS_ALLOW_USER_INTERACTION : POLKIT_CHECK_AUTHORIZATION_FLAGS_NONE;
auth = polkit_authority_get_sync(NULL, NULL); /* TODO timeout for this */
subj = polkit_system_bus_name_new(bus);
valid_actions = polkit_authority_enumerate_actions_sync(auth, NULL, NULL);
if(!auth || !valid_actions)
return ERROR_GENERIC; /* extremely unlikely */
else if(!subj)
return ERROR_BADBUS;
else if(!is_valid_action(valid_actions, action))
return ERROR_BADACTION;
if(!(result = polkit_authority_check_authorization_sync(auth, subj, action, NULL, prompt_flag, NULL, NULL)))
return ERROR_GENERIC; /* TODO pass, check gerror and return more relevant error */
authorized = polkit_authorization_result_get_is_authorized(result);
challenge = polkit_authorization_result_get_is_challenge(result);
/* free()'s before return */
if(auth)
g_object_unref(auth);
if(subj)
g_object_unref(subj);
if(result)
g_object_unref(result);
if(authorized) {
if(challenge)
return AUTHORIZED_BY_PROMPT;
return AUTHORIZED_NATIVELY;
} else if(challenge)
return UNAUTHORIZED_FAILED_PROMPT;
return UNAUTHORIZED_NATIVELY;
}
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