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1 | /* -*-c-*- |
2 | * |
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3 | * Key attribute manipulation |
4 | * |
5 | * (c) 1999 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Catacomb. |
11 | * |
12 | * Catacomb is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include <ctype.h> |
31 | #include <stdio.h> |
32 | #include <stdlib.h> |
33 | #include <string.h> |
34 | #include <time.h> |
35 | |
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36 | #include <mLib/dstr.h> |
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37 | #include <mLib/macros.h> |
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38 | #include <mLib/sym.h> |
39 | |
40 | #include "key.h" |
41 | |
42 | /*----- Main code ---------------------------------------------------------*/ |
43 | |
44 | /* --- @key_chkident@ --- * |
45 | * |
46 | * Arguments: @const char *p@ = pointer to a type string |
47 | * |
48 | * Returns: Zero if OK, -1 on error. |
49 | * |
50 | * Use: Checks whether an identification component string is OK. |
51 | */ |
52 | |
53 | int key_chkident(const char *p) |
54 | { |
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55 | if (!p || !*p || strlen(p) > 255) |
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56 | return (-1); |
57 | while (*p) { |
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58 | if (*p == ':' || *p == '.' || ISSPACE(*p)) |
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59 | return (-1); |
60 | p++; |
61 | } |
62 | return (0); |
63 | } |
64 | |
65 | /* --- @key_chkcomment@ --- * |
66 | * |
67 | * Arguments: @const char *p@ = pointer to a comment string |
68 | * |
69 | * Returns: Zero if OK, -1 on error. |
70 | * |
71 | * Use: Checks whether a comment string is OK. |
72 | */ |
73 | |
74 | int key_chkcomment(const char *p) |
75 | { |
76 | if (!p) |
77 | return (0); |
78 | if (!*p) |
79 | return (-1); |
80 | while (*p) { |
81 | if (*p == '\n') |
82 | return (-1); |
83 | p++; |
84 | } |
85 | return (0); |
86 | } |
87 | |
88 | /* --- @key_mkattriter@ --- * |
89 | * |
90 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
91 | * @key *k@ = pointer to key |
92 | * |
93 | * Returns: --- |
94 | * |
95 | * Use: Initializes an attribute iterator. The attributes are |
96 | * returned by @key_nextattr@. |
97 | */ |
98 | |
99 | void key_mkattriter(key_attriter *i, key *k) |
100 | { |
101 | sym_mkiter(&i->i, &k->a); |
102 | } |
103 | |
104 | /* --- @key_nextattr@ --- * |
105 | * |
106 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
107 | * @const char **n, **v@ = pointers to name and value |
108 | * |
109 | * Returns: Zero if no attribute available, or nonzero if returned OK. |
110 | * |
111 | * Use: Returns the next attribute. |
112 | */ |
113 | |
114 | int key_nextattr(key_attriter *i, const char **n, const char **v) |
115 | { |
116 | key_attr *a = sym_next(&i->i); |
117 | if (!a) |
118 | return (0); |
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119 | if (n) *n = SYM_NAME(a); |
120 | if (v) *v = a->p; |
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121 | return (1); |
122 | } |
123 | |
124 | /* --- @key_getattr@ --- * |
125 | * |
126 | * Arguments: @key_file *f@ = pointer to file |
127 | * @key *k@ = pointer to key |
128 | * @const char *n@ = pointer to attribute name |
129 | * |
130 | * Returns: Pointer to attribute value, or null if not found. |
131 | * |
132 | * Use: Returns the value of a key attribute. |
133 | */ |
134 | |
135 | const char *key_getattr(key_file *f, key *k, const char *n) |
136 | { |
137 | key_attr *a; |
138 | if ((a = sym_find(&k->a, n, -1, 0, 0)) == 0) |
139 | return (0); |
140 | return (a->p); |
141 | } |
142 | |
143 | /* --- @key_putattr@ --- * |
144 | * |
145 | * Arguments: @key_file *f@ = pointer to file |
146 | * @key *k@ = pointer to key |
147 | * @const char *n@ = pointer to attribute name |
148 | * @const char *v@ = pointer to attribute value or null |
149 | * |
150 | * Returns: Error code (one of the @KERR@ constants). |
151 | * |
152 | * Use: Inserts an attribute on a key. If an attribute with the same |
153 | * name already exists, it is deleted. Setting a null value |
154 | * removes the attribute. |
155 | */ |
156 | |
157 | int key_putattr(key_file *f, key *k, const char *n, const char *v) |
158 | { |
159 | key_attr *a; |
160 | unsigned found; |
161 | |
162 | if (!(f->f & KF_WRITE)) |
163 | return (KERR_READONLY); |
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164 | if (strlen(n) > 255) |
165 | return (KERR_BADATTR); |
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166 | |
167 | if (v) { |
168 | a = sym_find(&k->a, n, -1, sizeof(*a), &found); |
169 | if (found) |
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170 | xfree(a->p); |
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171 | a->p = xstrdup(v); |
172 | } else if ((a = sym_find(&k->a, n, -1, 0, 0)) != 0) { |
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173 | xfree(a->p); |
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174 | sym_remove(&k->a, a); |
175 | } |
176 | |
177 | f->f |= KF_MODIFIED; |
178 | return (0); |
179 | } |
180 | |
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181 | /* --- @key_setkeydata@ --- * |
182 | * |
183 | * Arguments: @key_file *kf@ = pointer to key file |
184 | * @key *k@ = pointer to key |
185 | * @key_data *kd@ = new key data |
186 | * |
187 | * Returns: Zero on success, or a @KERR_@ error code on failure. |
188 | * |
189 | * Use: Sets the key data for a key. |
190 | */ |
191 | |
192 | int key_setkeydata(key_file *kf, key *k, key_data *kd) |
193 | { |
194 | if (!(kf->f & KF_WRITE)) |
195 | return (KERR_READONLY); |
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196 | key_incref(kd); |
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197 | key_drop(k->k); |
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198 | k->k = kd; |
199 | kf->f |= KF_MODIFIED; |
200 | return (0); |
201 | } |
202 | |
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203 | /* --- @key_setcomment@ --- * |
204 | * |
205 | * Arguments: @key_file *f@ = pointer to key file block |
206 | * @key *k@ = pointer to key block |
207 | * @const char *c@ = pointer to comment to set, or zero |
208 | * |
209 | * Returns: Error code (one of the @KERR@ constants). |
210 | * |
211 | * Use: Replaces the key's current comment with a new one. |
212 | */ |
213 | |
214 | int key_setcomment(key_file *f, key *k, const char *c) |
215 | { |
216 | if (!(f->f & KF_WRITE)) |
217 | return (KERR_READONLY); |
218 | if (key_chkcomment(c)) |
219 | return (KERR_BADCOMMENT); |
220 | if (k->c) |
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221 | xfree(k->c); |
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222 | if (c) |
223 | k->c = xstrdup(c); |
224 | else |
225 | k->c = 0; |
226 | f->f |= KF_MODIFIED; |
227 | return (0); |
228 | } |
229 | |
230 | /* --- @key_settag@ --- * |
231 | * |
232 | * Arguments: @key_file *f@ = pointer to key file block |
233 | * @key *k@ = pointer to key block |
234 | * @const char *tag@ = pointer to comment to set, or zero |
235 | * |
236 | * Returns: Error code (one of the @KERR@ constants). |
237 | * |
238 | * Use: Replaces the key's current tag with a new one. |
239 | */ |
240 | |
241 | int key_settag(key_file *f, key *k, const char *tag) |
242 | { |
243 | key_ref *kr; |
244 | unsigned found; |
245 | |
246 | if (!(f->f & KF_WRITE)) |
247 | return (KERR_READONLY); |
248 | |
249 | /* --- Make sure the tag is OK --- */ |
250 | |
251 | if (tag && key_chkident(tag)) |
252 | return (KERR_BADTAG); |
253 | |
254 | /* --- See if the new tag is the same as the old one --- */ |
255 | |
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256 | if ((!tag && !k->tag) || (tag && k->tag && STRCMP(tag, ==, k->tag))) |
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257 | return (0); |
258 | |
259 | /* --- Allocate an entry for the new tag --- */ |
260 | |
261 | if (tag) { |
262 | kr = sym_find(&f->bytag, tag, -1, sizeof(*kr), &found); |
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263 | if (found && !KEY_EXPIRED(time(0), kr->k->del)) |
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264 | return (KERR_DUPTAG); |
265 | kr->k = k; |
266 | } |
267 | |
268 | /* --- Remove any existing tag --- */ |
269 | |
270 | if (k->tag) { |
271 | kr = sym_find(&f->bytag, k->tag, -1, 0, 0); |
272 | assert(((void)"No bytag link", kr)); |
273 | sym_remove(&f->bytag, kr); |
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274 | xfree(k->tag); |
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275 | } |
276 | |
277 | /* --- Done --- */ |
278 | |
279 | f->f |= KF_MODIFIED; |
280 | if (tag) |
281 | k->tag = xstrdup(tag); |
282 | else |
283 | k->tag = 0; |
284 | return (0); |
285 | } |
286 | |
287 | /* --- @key_fulltag@ --- * |
288 | * |
289 | * Arguments: @key *k@ = pointer to key |
290 | * @dstr *d@ = pointer to destination string |
291 | * |
292 | * Returns: --- |
293 | * |
294 | * Use: Emits the key's full tag, which has the form |
295 | * `ID:TYPE[:TAG]'. This is used in the textual file format, |
296 | * and to identify passphrases for locked keys. |
297 | */ |
298 | |
299 | void key_fulltag(key *k, dstr *d) |
300 | { |
301 | dstr_putf(d, "%08lx:%s", (unsigned long)k->id, k->type); |
302 | if (k->tag) |
303 | dstr_putf(d, ":%s", k->tag); |
304 | } |
305 | |
306 | /*----- That's all, folks -------------------------------------------------*/ |