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1 | /* |
2 | * Copyright (c) 2014 Ian Sutton <ian@kremlin.cc> |
3 | * |
4 | * Permission to use, copy, modify, and distribute this software for any |
5 | * purpose with or without fee is hereby granted, provided that the above |
6 | * copyright notice and this permission notice appear in all copies. |
7 | * |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
15 | */ |
16 | |
17 | #include <unistd.h> |
18 | #include <limits.h> |
19 | #include <string.h> |
20 | |
21 | #include <glib/gprintf.h> |
22 | #include <glib-unix.h> |
23 | #include <polkit/polkit.h> |
24 | |
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25 | #include "util.h" |
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26 | |
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27 | const gint MAX_TOKENS = 20; |
28 | |
29 | /* return must be g_free()'d */ |
30 | gchar *config_get(const gchar *path, gchar *key) { |
31 | |
32 | gchar *content, **split_content, *cur, **cur_split, *ret; |
33 | GError *err; |
34 | int incr = 0; |
35 | gboolean breaker = TRUE; |
36 | |
37 | ret = (gchar *) g_malloc0(4096); |
38 | |
39 | if(!g_file_get_contents(path, &content, NULL, &err)) |
40 | return NULL; |
41 | |
42 | split_content = g_strsplit(content, "\n", MAX_TOKENS); |
43 | |
44 | while(breaker && (cur = split_content[incr]) && (cur_split = g_strsplit(cur, "=", 2))) { |
45 | |
46 | if(!g_strcmp0(key, cur_split[0])) { |
47 | |
48 | g_strlcpy(ret, cur_split[1], 2048); |
49 | breaker = FALSE; |
50 | } |
51 | |
52 | incr++; |
53 | g_strfreev(cur_split); |
54 | } |
55 | |
56 | if(split_content) |
57 | g_strfreev(split_content); |
58 | if(content) |
59 | g_free(content); |
60 | |
61 | return (ret ? ret : NULL); |
62 | } |
63 | |
64 | gboolean config_set(const gchar *path, gchar *key, gchar *value) { |
65 | |
66 | gchar *content, **split_content, *cur, **cur_split, *rewrite; |
67 | GError *err_set, *err_get; |
68 | gboolean ret = FALSE; |
69 | int incr = 0; |
70 | gboolean breaker = TRUE; |
71 | |
72 | err_get = err_set = NULL; |
73 | |
74 | if(!g_file_get_contents(path, &content, NULL, &err_get)) |
75 | return FALSE; |
76 | |
77 | split_content = g_strsplit(content, "\n", MAX_TOKENS); |
78 | |
79 | while(breaker && (cur = split_content[incr]) && (cur_split = g_strsplit(cur, "=", 2))) { |
80 | |
81 | if(!g_strcmp0(key, cur_split[0])) { |
82 | |
83 | cur_split[1] = value; |
84 | split_content[incr] = g_strjoinv("=", cur_split); |
85 | ret = TRUE; |
86 | breaker = FALSE; |
87 | } |
88 | |
89 | incr++; |
90 | } |
91 | |
92 | if(ret) { |
93 | |
94 | rewrite = g_strjoinv("\n", split_content); |
95 | ret = g_file_set_contents(path, rewrite, -1, &err_set); |
96 | g_free(rewrite); |
97 | } |
98 | |
99 | if(cur_split) |
100 | g_strfreev(cur_split); |
101 | if(split_content) |
102 | g_strfreev(split_content); |
103 | if(content) |
104 | g_free(content); |
105 | |
106 | return ret; |
107 | } |
108 | |
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109 | static gboolean is_valid_action(GList *action_list, const gchar *action) { |
110 | |
111 | PolkitActionDescription *action_descr; |
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112 | const gchar *action_descr_id; |
113 | GList *cur; |
114 | gboolean ret; |
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115 | |
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116 | ret = FALSE; |
117 | cur = g_list_first(action_list); |
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118 | |
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119 | while(cur && (action_descr = ((PolkitActionDescription *)(cur->data))) && (action_descr_id = polkit_action_description_get_action_id(action_descr))) { |
120 | |
121 | if(!g_strcmp0(action, action_descr_id)) { |
122 | ret = TRUE; |
123 | break; |
124 | } |
125 | |
126 | cur = cur->next; |
127 | } |
128 | |
129 | g_list_free(action_list); |
130 | |
131 | return ret; |
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132 | } |
133 | |
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134 | check_auth_result polkit_try_auth(const gchar *bus, const gchar *action, gboolean prompt) { |
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135 | |
136 | GList *valid_actions; |
137 | PolkitAuthority *auth; |
138 | PolkitSubject *subj; |
139 | PolkitAuthorizationResult *result; |
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140 | PolkitCheckAuthorizationFlags prompt_flag; |
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141 | gboolean authorized, challenge; |
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142 | |
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143 | auth = NULL; |
144 | subj = NULL; |
145 | result = NULL; |
146 | valid_actions = NULL; |
147 | authorized = challenge = FALSE; |
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148 | prompt_flag = prompt ? POLKIT_CHECK_AUTHORIZATION_FLAGS_ALLOW_USER_INTERACTION : POLKIT_CHECK_AUTHORIZATION_FLAGS_NONE; |
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149 | |
150 | auth = polkit_authority_get_sync(NULL, NULL); /* TODO timeout for this */ |
151 | subj = polkit_system_bus_name_new(bus); |
152 | valid_actions = polkit_authority_enumerate_actions_sync(auth, NULL, NULL); |
153 | |
154 | if(!auth || !valid_actions) |
155 | return ERROR_GENERIC; /* extremely unlikely */ |
156 | else if(!subj) |
157 | return ERROR_BADBUS; |
158 | else if(!is_valid_action(valid_actions, action)) |
159 | return ERROR_BADACTION; |
160 | |
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161 | if(!(result = polkit_authority_check_authorization_sync(auth, subj, action, NULL, prompt_flag, NULL, NULL))) |
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162 | return ERROR_GENERIC; /* TODO pass, check gerror and return more relevant error */ |
163 | |
164 | authorized = polkit_authorization_result_get_is_authorized(result); |
165 | challenge = polkit_authorization_result_get_is_challenge(result); |
166 | |
167 | /* free()'s before return */ |
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168 | if(auth) |
169 | g_object_unref(auth); |
170 | if(subj) |
171 | g_object_unref(subj); |
172 | if(result) |
173 | g_object_unref(result); |
174 | |
175 | if(authorized) { |
176 | |
177 | if(challenge) |
178 | return AUTHORIZED_BY_PROMPT; |
179 | |
180 | return AUTHORIZED_NATIVELY; |
181 | |
182 | } else if(challenge) |
183 | return UNAUTHORIZED_FAILED_PROMPT; |
184 | |
185 | return UNAUTHORIZED_NATIVELY; |
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186 | } |