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22 * @file identity-provider/jwt.c
23 * @brief helper library for JSON-Web-Tokens
24 * @author Martin Schanzenbach
27 #include "gnunet_util_lib.h"
28 #include "gnunet_signatures.h"
29 #include "gnunet_identity_attribute_lib.h"
35 /*TODO is this the correct way to define new algs? */
36 #define JWT_ALG_VALUE "urn:org:gnunet:jwt:alg:ecdsa:ed25519"
40 #define JWT_TYP_VALUE "jwt"
42 //TODO change server address
43 #define SERVER_ADDRESS "https://localhost"
46 create_jwt_header(void)
51 root = json_object ();
52 json_object_set_new (root, JWT_ALG, json_string (JWT_ALG_VALUE));
53 json_object_set_new (root, JWT_TYP, json_string (JWT_TYP_VALUE));
55 json_str = json_dumps (root, JSON_INDENT(1));
61 * Create a JWT from attributes
63 * @param aud_key the public of the subject
64 * @param attrs the attribute list
65 * @param priv_key the key used to sign the JWT
66 * @return a new base64-encoded JWT string.
69 jwt_create_from_list (const struct GNUNET_CRYPTO_EcdsaPublicKey *aud_key,
70 const struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList *attrs,
71 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key)
73 struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry *le;
74 struct GNUNET_CRYPTO_EcdsaPublicKey sub_key;
75 struct GNUNET_CRYPTO_EcdsaSignature signature;
76 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
85 char* signature_target;
86 char* signature_base64;
90 //exp REQUIRED time expired from config
91 //iat REQUIRED time now
92 //auth_time only if max_age
94 // OPTIONAL acr,amr,azp
95 GNUNET_CRYPTO_ecdsa_key_get_public (priv_key, &sub_key);
96 /* TODO maybe we should use a local identity here */
97 subject = GNUNET_STRINGS_data_to_string_alloc (&sub_key,
98 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
99 audience = GNUNET_STRINGS_data_to_string_alloc (aud_key,
100 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
101 header = create_jwt_header ();
102 body = json_object ();
103 /* TODO who is the issuer? local IdP or subject ? See self-issued tokens? */
104 //iss REQUIRED case sensitive server uri with https
105 json_object_set_new (body,
106 "iss", json_string (SERVER_ADDRESS));
107 //sub REQUIRED public key identity, not exceed 255 ASCII length
108 json_object_set_new (body,
109 "sub", json_string (subject));
110 /* TODO what should be in here exactly? */
111 //aud REQUIRED public key client_id must be there
112 json_object_set_new (body,
113 "aud", json_string (audience));
114 for (le = attrs->list_head; NULL != le; le = le->next)
117 * TODO here we should have a function that
118 * calls the Attribute plugins to create a
119 * json representation for its value
121 attr_val_str = GNUNET_IDENTITY_ATTRIBUTE_value_to_string (le->claim->type,
123 le->claim->data_size);
124 json_object_set_new (body,
126 json_string (attr_val_str));
127 GNUNET_free (attr_val_str);
129 body_str = json_dumps (body, JSON_INDENT(0));
132 GNUNET_STRINGS_base64_encode (header,
135 //Remove GNUNET padding of base64
136 padding = strtok(header_base64, "=");
137 while (NULL != padding)
138 padding = strtok(NULL, "=");
140 GNUNET_STRINGS_base64_encode (body_str,
144 //Remove GNUNET padding of base64
145 padding = strtok(body_base64, "=");
146 while (NULL != padding)
147 padding = strtok(NULL, "=");
149 GNUNET_free (subject);
150 GNUNET_free (audience);
154 * Creating the JWT signature. This might not be
155 * standards compliant, check.
157 GNUNET_asprintf (&signature_target, "%s,%s", header_base64, body_base64);
160 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
161 strlen (signature_target));
163 htonl (strlen (signature_target) + sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose));
164 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TOKEN);
165 GNUNET_memcpy (&purpose[1], signature_target, strlen (signature_target));
166 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_sign (priv_key,
168 (struct GNUNET_CRYPTO_EcdsaSignature *)&signature))
170 GNUNET_free (signature_target);
171 GNUNET_free (body_str);
172 GNUNET_free (body_base64);
173 GNUNET_free (header_base64);
174 GNUNET_free (purpose);
177 GNUNET_STRINGS_base64_encode ((const char*)&signature,
178 sizeof (struct GNUNET_CRYPTO_EcdsaSignature),
180 GNUNET_asprintf (&result, "%s.%s.%s",
181 header_base64, body_base64, signature_base64);
183 GNUNET_free (signature_target);
184 GNUNET_free (header);
185 GNUNET_free (body_str);
186 GNUNET_free (signature_base64);
187 GNUNET_free (body_base64);
188 GNUNET_free (header_base64);
189 GNUNET_free (purpose);