| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: key-attr.c,v 1.2 2000/02/12 18:21:02 mdw Exp $ |
| 4 | * |
| 5 | * Key attribute manipulation |
| 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-attr.c,v $ |
| 33 | * Revision 1.2 2000/02/12 18:21:02 mdw |
| 34 | * Overhaul of key management (again). |
| 35 | * |
| 36 | * Revision 1.1 1999/12/22 15:47:48 mdw |
| 37 | * Major key-management revision. |
| 38 | * |
| 39 | */ |
| 40 | |
| 41 | /*----- Header files ------------------------------------------------------*/ |
| 42 | |
| 43 | #include <ctype.h> |
| 44 | #include <stdio.h> |
| 45 | #include <stdlib.h> |
| 46 | #include <string.h> |
| 47 | #include <time.h> |
| 48 | |
| 49 | #include <mLib/dstr.h> |
| 50 | #include <mLib/sym.h> |
| 51 | |
| 52 | #include "key.h" |
| 53 | |
| 54 | /*----- Main code ---------------------------------------------------------*/ |
| 55 | |
| 56 | /* --- @key_chkident@ --- * |
| 57 | * |
| 58 | * Arguments: @const char *p@ = pointer to a type string |
| 59 | * |
| 60 | * Returns: Zero if OK, -1 on error. |
| 61 | * |
| 62 | * Use: Checks whether an identification component string is OK. |
| 63 | */ |
| 64 | |
| 65 | int key_chkident(const char *p) |
| 66 | { |
| 67 | if (!p || !*p) |
| 68 | return (-1); |
| 69 | while (*p) { |
| 70 | if (*p == ':' || *p == '.' || isspace((unsigned char)*p)) |
| 71 | return (-1); |
| 72 | p++; |
| 73 | } |
| 74 | return (0); |
| 75 | } |
| 76 | |
| 77 | /* --- @key_chkcomment@ --- * |
| 78 | * |
| 79 | * Arguments: @const char *p@ = pointer to a comment string |
| 80 | * |
| 81 | * Returns: Zero if OK, -1 on error. |
| 82 | * |
| 83 | * Use: Checks whether a comment string is OK. |
| 84 | */ |
| 85 | |
| 86 | int key_chkcomment(const char *p) |
| 87 | { |
| 88 | if (!p) |
| 89 | return (0); |
| 90 | if (!*p) |
| 91 | return (-1); |
| 92 | while (*p) { |
| 93 | if (*p == '\n') |
| 94 | return (-1); |
| 95 | p++; |
| 96 | } |
| 97 | return (0); |
| 98 | } |
| 99 | |
| 100 | /* --- @key_mkattriter@ --- * |
| 101 | * |
| 102 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
| 103 | * @key *k@ = pointer to key |
| 104 | * |
| 105 | * Returns: --- |
| 106 | * |
| 107 | * Use: Initializes an attribute iterator. The attributes are |
| 108 | * returned by @key_nextattr@. |
| 109 | */ |
| 110 | |
| 111 | void key_mkattriter(key_attriter *i, key *k) |
| 112 | { |
| 113 | sym_mkiter(&i->i, &k->a); |
| 114 | } |
| 115 | |
| 116 | /* --- @key_nextattr@ --- * |
| 117 | * |
| 118 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
| 119 | * @const char **n, **v@ = pointers to name and value |
| 120 | * |
| 121 | * Returns: Zero if no attribute available, or nonzero if returned OK. |
| 122 | * |
| 123 | * Use: Returns the next attribute. |
| 124 | */ |
| 125 | |
| 126 | int key_nextattr(key_attriter *i, const char **n, const char **v) |
| 127 | { |
| 128 | key_attr *a = sym_next(&i->i); |
| 129 | if (!a) |
| 130 | return (0); |
| 131 | *n = SYM_NAME(a); |
| 132 | *v = a->p; |
| 133 | return (1); |
| 134 | } |
| 135 | |
| 136 | /* --- @key_getattr@ --- * |
| 137 | * |
| 138 | * Arguments: @key_file *f@ = pointer to file |
| 139 | * @key *k@ = pointer to key |
| 140 | * @const char *n@ = pointer to attribute name |
| 141 | * |
| 142 | * Returns: Pointer to attribute value, or null if not found. |
| 143 | * |
| 144 | * Use: Returns the value of a key attribute. |
| 145 | */ |
| 146 | |
| 147 | const char *key_getattr(key_file *f, key *k, const char *n) |
| 148 | { |
| 149 | key_attr *a; |
| 150 | if ((a = sym_find(&k->a, n, -1, 0, 0)) == 0) |
| 151 | return (0); |
| 152 | return (a->p); |
| 153 | } |
| 154 | |
| 155 | /* --- @key_putattr@ --- * |
| 156 | * |
| 157 | * Arguments: @key_file *f@ = pointer to file |
| 158 | * @key *k@ = pointer to key |
| 159 | * @const char *n@ = pointer to attribute name |
| 160 | * @const char *v@ = pointer to attribute value or null |
| 161 | * |
| 162 | * Returns: Error code (one of the @KERR@ constants). |
| 163 | * |
| 164 | * Use: Inserts an attribute on a key. If an attribute with the same |
| 165 | * name already exists, it is deleted. Setting a null value |
| 166 | * removes the attribute. |
| 167 | */ |
| 168 | |
| 169 | int key_putattr(key_file *f, key *k, const char *n, const char *v) |
| 170 | { |
| 171 | key_attr *a; |
| 172 | unsigned found; |
| 173 | |
| 174 | if (!(f->f & KF_WRITE)) |
| 175 | return (KERR_READONLY); |
| 176 | |
| 177 | if (v) { |
| 178 | a = sym_find(&k->a, n, -1, sizeof(*a), &found); |
| 179 | if (found) |
| 180 | free(a->p); |
| 181 | a->p = xstrdup(v); |
| 182 | } else if ((a = sym_find(&k->a, n, -1, 0, 0)) != 0) { |
| 183 | free(a->p); |
| 184 | sym_remove(&k->a, a); |
| 185 | } |
| 186 | |
| 187 | f->f |= KF_MODIFIED; |
| 188 | return (0); |
| 189 | } |
| 190 | |
| 191 | /* --- @key_setcomment@ --- * |
| 192 | * |
| 193 | * Arguments: @key_file *f@ = pointer to key file block |
| 194 | * @key *k@ = pointer to key block |
| 195 | * @const char *c@ = pointer to comment to set, or zero |
| 196 | * |
| 197 | * Returns: Error code (one of the @KERR@ constants). |
| 198 | * |
| 199 | * Use: Replaces the key's current comment with a new one. |
| 200 | */ |
| 201 | |
| 202 | int key_setcomment(key_file *f, key *k, const char *c) |
| 203 | { |
| 204 | if (!(f->f & KF_WRITE)) |
| 205 | return (KERR_READONLY); |
| 206 | if (key_chkcomment(c)) |
| 207 | return (KERR_BADCOMMENT); |
| 208 | if (k->c) |
| 209 | free(k->c); |
| 210 | if (c) |
| 211 | k->c = xstrdup(c); |
| 212 | else |
| 213 | k->c = 0; |
| 214 | f->f |= KF_MODIFIED; |
| 215 | return (0); |
| 216 | } |
| 217 | |
| 218 | /* --- @key_settag@ --- * |
| 219 | * |
| 220 | * Arguments: @key_file *f@ = pointer to key file block |
| 221 | * @key *k@ = pointer to key block |
| 222 | * @const char *tag@ = pointer to comment to set, or zero |
| 223 | * |
| 224 | * Returns: Error code (one of the @KERR@ constants). |
| 225 | * |
| 226 | * Use: Replaces the key's current tag with a new one. |
| 227 | */ |
| 228 | |
| 229 | int key_settag(key_file *f, key *k, const char *tag) |
| 230 | { |
| 231 | key_ref *kr; |
| 232 | unsigned found; |
| 233 | |
| 234 | if (!(f->f & KF_WRITE)) |
| 235 | return (KERR_READONLY); |
| 236 | |
| 237 | /* --- Make sure the tag is OK --- */ |
| 238 | |
| 239 | if (tag && key_chkident(tag)) |
| 240 | return (KERR_BADTAG); |
| 241 | |
| 242 | /* --- See if the new tag is the same as the old one --- */ |
| 243 | |
| 244 | if ((!tag && !k->tag) || |
| 245 | (tag && k->tag && strcmp(tag, k->tag) == 0)) |
| 246 | return (0); |
| 247 | |
| 248 | /* --- Allocate an entry for the new tag --- */ |
| 249 | |
| 250 | if (tag) { |
| 251 | kr = sym_find(&f->bytag, tag, -1, sizeof(*kr), &found); |
| 252 | if (found) |
| 253 | return (KERR_DUPTAG); |
| 254 | kr->k = k; |
| 255 | } |
| 256 | |
| 257 | /* --- Remove any existing tag --- */ |
| 258 | |
| 259 | if (k->tag) { |
| 260 | kr = sym_find(&f->bytag, k->tag, -1, 0, 0); |
| 261 | assert(((void)"No bytag link", kr)); |
| 262 | sym_remove(&f->bytag, kr); |
| 263 | free(k->tag); |
| 264 | } |
| 265 | |
| 266 | /* --- Done --- */ |
| 267 | |
| 268 | f->f |= KF_MODIFIED; |
| 269 | if (tag) |
| 270 | k->tag = xstrdup(tag); |
| 271 | else |
| 272 | k->tag = 0; |
| 273 | return (0); |
| 274 | } |
| 275 | |
| 276 | /* --- @key_fulltag@ --- * |
| 277 | * |
| 278 | * Arguments: @key *k@ = pointer to key |
| 279 | * @dstr *d@ = pointer to destination string |
| 280 | * |
| 281 | * Returns: --- |
| 282 | * |
| 283 | * Use: Emits the key's full tag, which has the form |
| 284 | * `ID:TYPE[:TAG]'. This is used in the textual file format, |
| 285 | * and to identify passphrases for locked keys. |
| 286 | */ |
| 287 | |
| 288 | void key_fulltag(key *k, dstr *d) |
| 289 | { |
| 290 | dstr_putf(d, "%08lx:%s", (unsigned long)k->id, k->type); |
| 291 | if (k->tag) |
| 292 | dstr_putf(d, ":%s", k->tag); |
| 293 | } |
| 294 | |
| 295 | /*----- That's all, folks -------------------------------------------------*/ |