483e90b7 |
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 | |
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29 | /* return must be g_free()'d */ |
30 | gchar *get_file_sha256(const gchar *path) { |
31 | |
32 | gchar *checksum; |
33 | GMappedFile *file; |
34 | GBytes *data; |
35 | GError *err = NULL; |
36 | |
37 | file = g_mapped_file_new(path, FALSE, &err); |
38 | |
39 | if(file) { |
40 | |
41 | data = g_mapped_file_get_bytes(file); |
42 | g_mapped_file_unref(file); |
43 | checksum = g_compute_checksum_for_bytes(G_CHECKSUM_SHA256, data); |
44 | return checksum; |
45 | } else |
46 | return NULL; |
47 | } |
48 | |
de46ace4 |
49 | /* return must be g_free()'d */ |
50 | gchar *config_get(const gchar *path, gchar *key) { |
51 | |
52 | gchar *content, **split_content, *cur, **cur_split, *ret; |
53 | GError *err; |
54 | int incr = 0; |
55 | gboolean breaker = TRUE; |
56 | |
57 | ret = (gchar *) g_malloc0(4096); |
58 | |
59 | if(!g_file_get_contents(path, &content, NULL, &err)) |
60 | return NULL; |
61 | |
62 | split_content = g_strsplit(content, "\n", MAX_TOKENS); |
63 | |
64 | while(breaker && (cur = split_content[incr]) && (cur_split = g_strsplit(cur, "=", 2))) { |
65 | |
66 | if(!g_strcmp0(key, cur_split[0])) { |
67 | |
68 | g_strlcpy(ret, cur_split[1], 2048); |
69 | breaker = FALSE; |
70 | } |
71 | |
72 | incr++; |
73 | g_strfreev(cur_split); |
74 | } |
75 | |
76 | if(split_content) |
77 | g_strfreev(split_content); |
78 | if(content) |
79 | g_free(content); |
80 | |
81 | return (ret ? ret : NULL); |
82 | } |
83 | |
84 | gboolean config_set(const gchar *path, gchar *key, gchar *value) { |
85 | |
86 | gchar *content, **split_content, *cur, **cur_split, *rewrite; |
87 | GError *err_set, *err_get; |
88 | gboolean ret = FALSE; |
89 | int incr = 0; |
90 | gboolean breaker = TRUE; |
91 | |
92 | err_get = err_set = NULL; |
93 | |
94 | if(!g_file_get_contents(path, &content, NULL, &err_get)) |
95 | return FALSE; |
96 | |
97 | split_content = g_strsplit(content, "\n", MAX_TOKENS); |
98 | |
99 | while(breaker && (cur = split_content[incr]) && (cur_split = g_strsplit(cur, "=", 2))) { |
100 | |
101 | if(!g_strcmp0(key, cur_split[0])) { |
102 | |
103 | cur_split[1] = value; |
104 | split_content[incr] = g_strjoinv("=", cur_split); |
105 | ret = TRUE; |
106 | breaker = FALSE; |
107 | } |
108 | |
109 | incr++; |
110 | } |
111 | |
112 | if(ret) { |
113 | |
114 | rewrite = g_strjoinv("\n", split_content); |
115 | ret = g_file_set_contents(path, rewrite, -1, &err_set); |
116 | g_free(rewrite); |
117 | } |
118 | |
119 | if(cur_split) |
120 | g_strfreev(cur_split); |
121 | if(split_content) |
122 | g_strfreev(split_content); |
123 | if(content) |
124 | g_free(content); |
125 | |
126 | return ret; |
127 | } |
128 | |
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129 | static gboolean is_valid_action(GList *action_list, const gchar *action) { |
130 | |
131 | PolkitActionDescription *action_descr; |
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132 | const gchar *action_descr_id; |
133 | GList *cur; |
134 | gboolean ret; |
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135 | |
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136 | ret = FALSE; |
137 | cur = g_list_first(action_list); |
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138 | |
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139 | while(cur && (action_descr = ((PolkitActionDescription *)(cur->data))) && (action_descr_id = polkit_action_description_get_action_id(action_descr))) { |
140 | |
141 | if(!g_strcmp0(action, action_descr_id)) { |
142 | ret = TRUE; |
143 | break; |
144 | } |
145 | |
146 | cur = cur->next; |
147 | } |
148 | |
149 | g_list_free(action_list); |
150 | |
151 | return ret; |
2f9f6524 |
152 | } |
153 | |
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154 | check_auth_result polkit_try_auth(const gchar *bus, const gchar *action, gboolean prompt) { |
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155 | |
156 | GList *valid_actions; |
157 | PolkitAuthority *auth; |
158 | PolkitSubject *subj; |
159 | PolkitAuthorizationResult *result; |
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160 | PolkitCheckAuthorizationFlags prompt_flag; |
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161 | gboolean authorized, challenge; |
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162 | |
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163 | auth = NULL; |
164 | subj = NULL; |
165 | result = NULL; |
166 | valid_actions = NULL; |
167 | authorized = challenge = FALSE; |
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168 | prompt_flag = prompt ? POLKIT_CHECK_AUTHORIZATION_FLAGS_ALLOW_USER_INTERACTION : POLKIT_CHECK_AUTHORIZATION_FLAGS_NONE; |
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169 | |
170 | auth = polkit_authority_get_sync(NULL, NULL); /* TODO timeout for this */ |
171 | subj = polkit_system_bus_name_new(bus); |
172 | valid_actions = polkit_authority_enumerate_actions_sync(auth, NULL, NULL); |
173 | |
174 | if(!auth || !valid_actions) |
175 | return ERROR_GENERIC; /* extremely unlikely */ |
176 | else if(!subj) |
177 | return ERROR_BADBUS; |
178 | else if(!is_valid_action(valid_actions, action)) |
179 | return ERROR_BADACTION; |
180 | |
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181 | if(!(result = polkit_authority_check_authorization_sync(auth, subj, action, NULL, prompt_flag, NULL, NULL))) |
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182 | return ERROR_GENERIC; /* TODO pass, check gerror and return more relevant error */ |
183 | |
184 | authorized = polkit_authorization_result_get_is_authorized(result); |
185 | challenge = polkit_authorization_result_get_is_challenge(result); |
186 | |
187 | /* free()'s before return */ |
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188 | if(auth) |
189 | g_object_unref(auth); |
190 | if(subj) |
191 | g_object_unref(subj); |
192 | if(result) |
193 | g_object_unref(result); |
194 | |
195 | if(authorized) { |
196 | |
197 | if(challenge) |
198 | return AUTHORIZED_BY_PROMPT; |
199 | |
200 | return AUTHORIZED_NATIVELY; |
201 | |
202 | } else if(challenge) |
203 | return UNAUTHORIZED_FAILED_PROMPT; |
204 | |
205 | return UNAUTHORIZED_NATIVELY; |
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206 | } |