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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: key-flags.c,v 1.4 2004/04/02 01:03:49 mdw Exp $ |
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4 | * |
5 | * Reading and writing key flag strings |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: key-flags.c,v $ |
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33 | * Revision 1.4 2004/04/02 01:03:49 mdw |
34 | * Miscellaneous constification. |
35 | * |
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36 | * Revision 1.3 2004/03/28 01:58:47 mdw |
37 | * Generate, store and retreive elliptic curve keys. |
38 | * |
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39 | * Revision 1.2 2000/02/12 18:21:02 mdw |
40 | * Overhaul of key management (again). |
41 | * |
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42 | * Revision 1.1 1999/12/22 15:47:48 mdw |
43 | * Major key-management revision. |
44 | * |
45 | */ |
46 | |
47 | /*----- Header files ------------------------------------------------------*/ |
48 | |
49 | #include <stdlib.h> |
50 | #include <string.h> |
51 | |
52 | #include <mLib/bits.h> |
53 | #include <mLib/dstr.h> |
54 | |
55 | #include "key.h" |
56 | |
57 | /*----- Data structures ---------------------------------------------------*/ |
58 | |
59 | typedef struct key_flags { |
60 | unsigned f; |
61 | unsigned m; |
62 | } key_flags; |
63 | |
64 | /*----- Flags table -------------------------------------------------------*/ |
65 | |
66 | typedef struct flagent { |
67 | const char *name; |
68 | unsigned f; |
69 | unsigned m; |
70 | } flagent; |
71 | |
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72 | static const flagent flagtab[] = { |
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73 | |
74 | /* --- Encoding types --- */ |
75 | |
76 | { "binary", KENC_BINARY, KF_ENCMASK }, |
77 | { "integer", KENC_MP, KF_ENCMASK }, |
78 | { "struct", KENC_STRUCT, KF_ENCMASK }, |
79 | { "encrypt", KENC_ENCRYPT, KF_ENCMASK }, |
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80 | { "string", KENC_STRING, KF_ENCMASK }, |
81 | { "ec", KENC_EC, KF_ENCMASK }, |
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82 | |
83 | /* --- Classes of keys --- */ |
84 | |
85 | { "shared", KCAT_SHARE, KF_CATMASK }, |
86 | { "public", KCAT_PUB, KF_CATMASK }, |
87 | { "private", KCAT_PRIV, KF_CATMASK }, |
88 | { "symmetric", KCAT_SYMM, KF_CATMASK }, |
89 | { "secret", 0, KF_NONSECRET }, |
90 | { "-secret", KF_NONSECRET, KF_NONSECRET }, |
91 | |
92 | /* --- Other flags --- */ |
93 | |
94 | { "burn", KF_BURN, KF_BURN }, |
95 | { "-burn", 0, KF_BURN }, |
96 | |
97 | /* --- End marker --- */ |
98 | |
99 | { 0, 0, 0 } |
100 | }; |
101 | |
102 | /*----- Main code ---------------------------------------------------------*/ |
103 | |
104 | /* --- @key_readflags@ --- * |
105 | * |
106 | * Arguments: @const char *p@ = pointer to string to read |
107 | * @char **pp@ = where to store the end pointer |
108 | * @unsigned *ff@ = where to store the flags |
109 | * @unsigned *mm@ = where to store the mask |
110 | * |
111 | * Returns: Zero if all went well, nonzero if there was an error. |
112 | * |
113 | * Use: Reads a flag string. |
114 | */ |
115 | |
116 | int key_readflags(const char *p, char **pp, unsigned *ff, unsigned *mm) |
117 | { |
118 | unsigned f = 0, m = 0; |
119 | |
120 | for (;;) { |
121 | size_t sz = strcspn(p, ",:"); |
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122 | const flagent *e, *ee = 0; |
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123 | |
124 | /* --- Look up the string in the flags table --- */ |
125 | |
126 | for (e = flagtab; e->name; e++) { |
127 | if (strncmp(e->name, p, sz) == 0) { |
128 | if (e->name[sz] == 0) { |
129 | ee = e; |
130 | break; |
131 | } else if (ee) |
132 | return (KERR_BADFLAGS); |
133 | else |
134 | ee = e; |
135 | } |
136 | } |
137 | if (!ee) |
138 | return (KERR_BADFLAGS); |
139 | |
140 | /* --- Adjust the flag words --- * |
141 | * |
142 | * Ensure that the flags set are disjoint. |
143 | */ |
144 | |
145 | if (m & ee->m) |
146 | return (KERR_BADFLAGS); |
147 | m |= ee->m; |
148 | f |= ee->f; |
149 | p += sz; |
150 | if (*p == 0 || *p == ':') |
151 | break; |
152 | p++; |
153 | } |
154 | |
155 | /* --- Report the results --- */ |
156 | |
157 | if (ff) *ff = f; |
158 | if (mm) *mm = m; |
159 | if (pp) *pp = (char *)p; |
160 | return (0); |
161 | } |
162 | |
163 | /* --- @key_writeflags@ --- * |
164 | * |
165 | * Arguments: @unsigned f@ = flags to write |
166 | * @dstr *d@ = pointer to destination string |
167 | * |
168 | * Returns: --- |
169 | * |
170 | * Use: Emits a flags word as a string representation. |
171 | */ |
172 | |
173 | void key_writeflags(unsigned f, dstr *d) |
174 | { |
175 | int del = 0; |
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176 | const flagent *e; |
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177 | unsigned m = 0; |
178 | |
179 | for (e = flagtab; e->name; e++) { |
180 | if (m & e->m || e->name[0] == '-' || (f & e->m) != e->f) |
181 | continue; |
182 | if (del) |
183 | DPUTC(d, ','); |
184 | DPUTS(d, e->name); |
185 | m |= e->m; |
186 | del = 1; |
187 | } |
188 | } |
189 | |
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190 | /* --- @key_match@ --- * |
191 | * |
192 | * Arguments: @key_data *k@ = pointer to key data block |
193 | * @const key_filter *kf@ = pointer to filter block |
194 | * |
195 | * Returns: Nonzero if the key matches the filter. |
196 | * |
197 | * Use: Checks whether a key matches a filter. |
198 | */ |
199 | |
200 | int key_match(key_data *k, const key_filter *kf) |
201 | { |
202 | sym_iter i; |
203 | key_struct *ks; |
204 | |
205 | if (!kf) |
206 | return (1); |
207 | if ((k->e & KF_ENCMASK) != KENC_STRUCT) |
208 | return ((k->e & kf->m) == kf->f); |
209 | |
210 | for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) { |
211 | if (key_match(&ks->k, kf)) |
212 | return (1); |
213 | } |
214 | return (0); |
215 | } |
216 | |
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217 | /*----- That's all, folks -------------------------------------------------*/ |