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3 Copyright (C) 2009-2013, 2016 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
23 * @file abd/delegate_misc.c
24 * @brief Misc API for delegate
26 * @author Martin Schanzenbach
29 #include "gnunet_util_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_abd_service.h"
32 #include "gnunet_signatures.h"
37 GNUNET_ABD_delegate_to_string (
38 const struct GNUNET_ABD_Delegate *cred)
45 subject_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred->subject_key);
46 issuer_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred->issuer_key);
47 GNUNET_STRINGS_base64_encode ((char *) &cred->signature,
48 sizeof (struct GNUNET_CRYPTO_EcdsaSignature),
50 if (0 == cred->subject_attribute_len)
52 GNUNET_asprintf (&cred_str,
53 "%s.%s -> %s | %s | %" SCNu64,
55 cred->issuer_attribute,
58 cred->expiration.abs_value_us);
62 GNUNET_asprintf (&cred_str,
63 "%s.%s -> %s.%s | %s | %" SCNu64,
65 cred->issuer_attribute,
67 cred->subject_attribute,
69 cred->expiration.abs_value_us);
71 GNUNET_free (subject_pkey);
72 GNUNET_free (issuer_pkey);
73 GNUNET_free (signature);
79 struct GNUNET_ABD_Delegate *
80 GNUNET_ABD_delegate_from_string (const char *s)
82 struct GNUNET_ABD_Delegate *dele;
83 size_t enclen = (sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)) * 8;
85 enclen += 5 - enclen % 5;
86 enclen /= 5; /* 260/5 = 52 */
87 char subject_pkey[enclen + 1];
88 char issuer_pkey[enclen + 1];
89 char iss_attr[253 + 1];
90 // Needs to be initialized, in case of Type 1 credential (A.a <- B)
91 char sub_attr[253 + 1] = "";
92 char signature[256]; // TODO max payload size
94 struct GNUNET_CRYPTO_EcdsaSignature *sig;
95 struct GNUNET_TIME_Absolute etime_abs;
97 // If it's A.a <- B.b...
99 "%52s.%253s -> %52s.%253s | %s | %" SCNu64,
105 &etime_abs.abs_value_us))
107 // Try if it's A.a <- B
109 "%52s.%253s -> %52s | %s | %" SCNu64,
114 &etime_abs.abs_value_us))
116 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
117 "Unable to parse DEL record string `%s'\n",
125 if (strcmp (sub_attr, "") == 0)
127 attr_len = strlen (iss_attr) + 1;
131 attr_len = strlen (iss_attr) + strlen (sub_attr) + 2;
133 dele = GNUNET_malloc (sizeof (struct GNUNET_ABD_Delegate) + attr_len);
135 char tmp_str[attr_len];
136 GNUNET_memcpy (tmp_str, iss_attr, strlen (iss_attr));
137 if (strcmp (sub_attr, "") != 0)
139 tmp_str[strlen (iss_attr)] = '\0';
140 GNUNET_memcpy (tmp_str + strlen (iss_attr) + 1,
144 tmp_str[attr_len - 1] = '\0';
146 GNUNET_CRYPTO_ecdsa_public_key_from_string (subject_pkey,
147 strlen (subject_pkey),
149 GNUNET_CRYPTO_ecdsa_public_key_from_string (issuer_pkey,
150 strlen (issuer_pkey),
152 GNUNET_assert (sizeof (struct GNUNET_CRYPTO_EcdsaSignature) ==
153 GNUNET_STRINGS_base64_decode (signature,
156 dele->signature = *sig;
157 dele->expiration = etime_abs;
160 GNUNET_memcpy (&dele[1], tmp_str, attr_len);
162 dele->issuer_attribute = (char *) &dele[1];
163 dele->issuer_attribute_len = strlen (iss_attr);
164 if (strcmp (sub_attr, "") == 0)
166 dele->subject_attribute = NULL;
167 dele->subject_attribute_len = 0;
171 dele->subject_attribute = (char *) &dele[1] + strlen (iss_attr) + 1;
172 dele->subject_attribute_len = strlen (sub_attr);
180 * Issue an attribute to a subject
182 * @param issuer the ego that should be used to issue the attribute
183 * @param subject the subject of the attribute
184 * @param iss_attr the name of the attribute
185 * @return handle to the queued request
188 struct GNUNET_ABD_Delegate *
189 GNUNET_ABD_delegate_issue (
190 const struct GNUNET_CRYPTO_EcdsaPrivateKey *issuer,
191 struct GNUNET_CRYPTO_EcdsaPublicKey *subject,
192 const char *iss_attr,
193 const char *sub_attr,
194 struct GNUNET_TIME_Absolute *expiration)
196 struct DelegateEntry *del;
197 struct GNUNET_ABD_Delegate *dele;
201 if (NULL == sub_attr)
204 attr_len = strlen (iss_attr) + 1;
208 // +2 for both strings need to be terminated with \0
209 attr_len = strlen (iss_attr) + strlen (sub_attr) + 2;
211 size = sizeof (struct DelegateEntry) + attr_len;
213 char tmp_str[attr_len];
214 GNUNET_memcpy (tmp_str, iss_attr, strlen (iss_attr));
215 if (NULL != sub_attr)
217 tmp_str[strlen (iss_attr)] = '\0';
218 GNUNET_memcpy (tmp_str + strlen (iss_attr) + 1,
222 tmp_str[attr_len - 1] = '\0';
224 del = GNUNET_malloc (size);
226 htonl (size - sizeof (struct GNUNET_CRYPTO_EcdsaSignature));
227 del->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_DELEGATE);
228 GNUNET_CRYPTO_ecdsa_key_get_public (issuer, &del->issuer_key);
229 del->subject_key = *subject;
230 del->expiration = GNUNET_htonll (expiration->abs_value_us);
231 del->issuer_attribute_len = htonl (strlen (iss_attr) + 1);
232 if (NULL == sub_attr)
234 del->subject_attribute_len = htonl (0);
238 del->subject_attribute_len = htonl (strlen (sub_attr) + 1);
241 GNUNET_memcpy (&del[1], tmp_str, attr_len);
244 GNUNET_CRYPTO_ecdsa_sign (issuer, &del->purpose, &del->signature))
251 dele = GNUNET_malloc (sizeof (struct GNUNET_ABD_Delegate) + attr_len);
252 dele->signature = del->signature;
253 dele->expiration = *expiration;
254 GNUNET_CRYPTO_ecdsa_key_get_public (issuer, &dele->issuer_key);
256 dele->subject_key = *subject;
258 // Copy the combined string at the part in the memory where the struct ends
259 GNUNET_memcpy (&dele[1], tmp_str, attr_len);
261 dele->issuer_attribute = (char *) &dele[1];
262 dele->issuer_attribute_len = strlen (iss_attr);
263 if (NULL == sub_attr)
265 dele->subject_attribute = NULL;
266 dele->subject_attribute_len = 0;
270 dele->subject_attribute = (char *) &dele[1] + strlen (iss_attr) + 1;
271 dele->subject_attribute_len = strlen (sub_attr);