/* $OpenBSD: sample-app.c,v 1.7 2004/06/29 11:35:56 msf Exp $ */ /* * The author of this code is Angelos D. Keromytis (angelos@dsl.cis.upenn.edu) * * This code was written by Angelos D. Keromytis in Philadelphia, PA, USA, * in April-May 1998 * * Copyright (C) 1998, 1999 by Angelos D. Keromytis. * * Permission to use, copy, and modify this software with or without fee * is hereby granted, provided that this entire notice is included in * all copies of any software which is or includes a copy or * modification of this software. * * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR * IMPLIED WARRANTY. IN PARTICULAR, THE AUTHORS MAKES NO * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR * PURPOSE. */ #include #include #include #include #include char policy_assertions[] = "Authorizer: \"POLICY\"\n" \ "Licensees: \"rsa-hex:3048024100d15d08ce7d2103d93ef21a87330361\\\n" \ " ff123096b14330f9f0936e8f2064ef815ffdaabbb7d3ba47b\\\n" \ " 49fac090cf44818af7ac7d66c2910f32d8d5eb261328558e1\\\n" \ " 0203010001\"\n" \ "Comment: This is our first policy assertion\n" \ "Conditions: app_domain == \"test application\" -> \"true\";\n" \ "\n" \ "Authorizer: \"POLICY\"\n" \ "Licensees: KEY1 || KEY2\n" \ "Local-Constants: \n" \ " KEY1 = \"rsa-base64:MEgCQQCzxWCi619s3Bqf8QOZTREBFelqWvljw\\\n" \ " vCwktO7/5zufcz+P0UBRBFNtasWgkP6/tAIK8MnLMUnejGsye\\\n" \ " DS2EVzAgMBAAE=\"\n" \ " KEY2 = \"dsa-base64:MIHfAkEAhRzwrvhbRXIJH+nGfQB/tRp3ueF0j\\\n" \ " 4OqVU4GmC6eIlrmlKxR+Me6tjqtWJr5gf/AEOnzoQAPRIlpiP\\\n" \ " VJX1mRjwJBAKHTpHS7M938wVr+lIMjq0H0Aav5T4jlxS2rphI\\\n" \ " 4fbc7tJm6wPW9p2KyHbe9GaZgzYK1OdnNXdanM/AkLW4OKz0C\\\n" \ " FQDF69A/EHKoQC1H6DxCi0L3HfW9uwJANCLE6ViRxnv4Jj0gV\\\n" \ " 8aO/b5AD+uA63+0EXUxO0Hqp91lzhDg/61BusMxFq7mQI0CLv\\\n" \ " S+dlCGShsYyB+VjSub7Q==\"\n" \ "Comment: A slightly more complicated policy\n" \ "Conditions: app_domain == \"test application\" && @some_num == 1 && \n" \ " (some_var == \"some value\" || \n" \ " some_var == \"some other value\") -> \"true\";"; char credential_assertions[] = "KeyNote-Version: 2\n"\ "Authorizer: KEY1\n" "Local-Constants: \n" \ " KEY1 = \"rsa-base64:MEgCQQCzxWCi619s3Bqf8QOZTREBFelqWvljw\\\n" \ " vCwktO7/5zufcz+P0UBRBFNtasWgkP6/tAIK8MnLMUnejGsye\\\n" \ " DS2EVzAgMBAAE=\"\n" \ "Licensees: \"dsa-hex:3081de02402121e160209f7ecef1b6866c907e8d\\\n" \ " d65e9a67ef0fbd6ece7760b7c8bb0d9a0b71a0dd921b949f0\\\n" \ " 9a16092eb3f50e33892bc3e9f1c8409f5298de40461493ef1\\\n" \ " 024100a60b7e77f317e156566b388aaa32c3866a086831649\\\n" \ " 1a55ab6fb8e57f7ade4a2a31e43017c383ab2a3e54f49688d\\\n" \ " d66a326b7362beb974f2f1fb7dd573dd1bdf021500909807a\\\n" \ " 4937f198fe893be6c63a7d627f13a385b02405811292c9949\\\n" \ " 7aa80911c781a0ff51a5843423b9b4d03ad7e708ae2bfacaf\\\n" \ " 11477f4f197dbba534194f8afd1e0b73261bb0a2c04af35db\\\n" \ " 0507f5cffe74ed4f1a\"\n" \ "Conditions: app_domain == \"test application\" && \n" \ " another_var == \"foo\" -> \"true\";\n" \ "Signature: \"sig-rsa-sha1-base64:E2OhrczI0LtAYAoJ6fSlqvlQDA4r\\\n" \ " GiIX73T6p9eExpyHZbfjxPxXEIf6tbBre6x2Y26wBQCx/yCj5\\\n" \ " 4IS3tuY2w==\"\n"; char action_authorizer[] = "dsa-hex:3081de02402121e160209f7ecef1b6866c907e8d" \ "d65e9a67ef0fbd6ece7760b7c8bb0d9a0b71a0dd921b949f0" \ "9a16092eb3f50e33892bc3e9f1c8409f5298de40461493ef1" \ "024100a60b7e77f317e156566b388aaa32c3866a086831649" \ "1a55ab6fb8e57f7ade4a2a31e43017c383ab2a3e54f49688d" \ "d66a326b7362beb974f2f1fb7dd573dd1bdf021500909807a" \ "4937f198fe893be6c63a7d627f13a385b02405811292c9949" \ "7aa80911c781a0ff51a5843423b9b4d03ad7e708ae2bfacaf" \ "11477f4f197dbba534194f8afd1e0b73261bb0a2c04af35db" \ "0507f5cffe74ed4f1a"; #define NUM_RETURN_VALUES 2 char *returnvalues[NUM_RETURN_VALUES]; /* * Sample application. We do the following: * - create a session * - read a "file" with our KeyNote policy assertions * - obtain a credential * - obtain the requester's public key * - construct an action attribute set * - do the query * * Since this is a sample application, we won't be actually reading any * real files or sockets. See the comments in the code below. */ int main(int argc, char **argv) { int sessionid, num, i, j; char **decomposed; /* * We are creating a new KeyNote session here. A session may be temporary * (we create it, add policies, credentials, authorizers, action set, do * the query, and then we destroy it), or it may be persistent (if, for * example, policies remain the same for a while). * * In this example, we'll just assume the session is temporary, but there * will be comments as to what to do if this were a persistent session. */ sessionid = kn_init(); if (sessionid == -1) { fprintf(stderr, "Failed to create a new session.\n"); exit(1); } /* * Assume we have read a file, or somehow securely acquired our policy * assertions, and we have stored them in policy_assertions. */ /* Let's find how many policies we just "read". */ decomposed = kn_read_asserts(policy_assertions, strlen(policy_assertions), &num); if (decomposed == NULL) { fprintf(stderr, "Failed to allocate memory for policy assertions.\n"); exit(1); } /* * If there were no assertions in the first argument to kn_read_asserts, * we'll get a valid pointer back, which we need to free. Note that this * is an error; we always MUST have at least one policy assertion. */ if (num == 0) { free(decomposed); fprintf(stderr, "No policy assertions provided.\n"); exit(1); } /* * We no longer need a copy of policy_assertions, so we could * free it here. */ /* * decomposed now contains num pointers to strings, each containing a * single assertion. We now add them all to the session. Note that * we must provide the ASSERT_FLAG_LOCAL flag to indicate that these * are policy assertions and thus do not have a signature field. */ for (i = 0; i < num; i++) { j = kn_add_assertion(sessionid, decomposed[i], strlen(decomposed[i]), ASSERT_FLAG_LOCAL); if (j == -1) { switch (keynote_errno) { case ERROR_MEMORY: fprintf(stderr, "Out of memory, trying to add policy " "assertion %d.\n", j); break; case ERROR_SYNTAX: fprintf(stderr, "Syntax error parsing policy " "assertion %d.\n", j); break; case ERROR_NOTFOUND: fprintf(stderr, "Session %d not found while adding " "policy assertion %d.\n", sessionid, j); default: fprintf(stderr, "Unspecified error %d (shouldn't happen) " "while adding policy assertion %d.\n", keynote_errno, j); break; } /* We don't need the assertion any more. */ free(decomposed[i]); } } /* Now free decomposed itself. */ free(decomposed); /* * Now, assume we have somehow acquired (through some application-dependent * means) one or more KeyNote credentials, and the key of the action * authorizer. For example, if this were an HTTP authorization application, * we would have acquired the credential(s) and the key after completing * an SSL protocol exchange. * * So, we have some credentials in credential_assertions, and a key * in action_authorizer. */ /* Let's find how many credentials we just "received". */ decomposed = kn_read_asserts(credential_assertions, strlen(credential_assertions), &num); if (decomposed == NULL) { fprintf(stderr, "Failed to allocate memory for credential " "assertions.\n"); exit(1); } /* * If there were no assertions in the first argument to kn_read_asserts, * we'll get a valid pointer back, which we need to free. Note that * it is legal to have zero credentials. */ if (num == 0) { free(decomposed); fprintf(stderr, "No credential assertions provided.\n"); } /* * We no longer need a copy of credential_assertions, so we could * free it here. */ /* * decomposed now contains num pointers to strings, each containing a * single assertion. We now add them all to the session. Note that here * we must NOT provide the ASSERT_FLAG_LOCAL flag, since these are * all credential assertions and need to be cryptographically verified. */ for (i = 0; i < num; i++) { /* * The value returned by kn_add_assertion() is an ID for that * assertion (unless it's a -1, which indicates an error). We could * use this ID to remove the assertion from the session in the future, * if we needed to. We would need to store the IDs somewhere of * course. * * If this were a persistent session, it may make sense to delete * the credentials we just added after we are done with the query, * simply to conserve memory. On the other hand, we could just leave * them in the session; this has no security implications. * * Also note that we could do the same with policy assertions. * However, if we want to delete policy assertions, it usually then * makes sense to just destroy the whole session via kn_close(), * which frees all allocated resources. */ j = kn_add_assertion(sessionid, decomposed[i], strlen(decomposed[i]), 0); if (j == -1) { switch (keynote_errno) { case ERROR_MEMORY: fprintf(stderr, "Out of memory, trying to add credential " "assertion %d.\n", j); break; case ERROR_SYNTAX: fprintf(stderr, "Syntax error parsing credential " "assertion %d.\n", j); break; case ERROR_NOTFOUND: fprintf(stderr, "Session %d not found while adding " "credential assertion %d.\n", sessionid, j); default: fprintf(stderr, "Unspecified error %d (shouldn't happen) " "while adding credential assertion %d.\n", keynote_errno, j); break; } /* We don't need the assertion any more. */ free(decomposed[i]); } } /* No longer needed. */ free(decomposed); /* * Now add the action authorizer. If we have more than one, just * repeat. Note that the value returned here is just a success or * failure indicator. If we want to later on delete an authorizer from * the session (which we MUST do if this is a persistent session), * we must keep a copy of the key. */ if (kn_add_authorizer(sessionid, action_authorizer) == -1) { switch (keynote_errno) { case ERROR_MEMORY: fprintf(stderr, "Out of memory while adding action " "authorizer.\n"); break; case ERROR_SYNTAX: fprintf(stderr, "Malformed action authorizer.\n"); break; case ERROR_NOTFOUND: fprintf(stderr, "Session %d not found while adding action " "authorizer.\n", sessionid); break; default: fprintf(stderr, "Unspecified error while adding action " "authorizer.\n"); break; } } /* * If we don't need action_authorizer any more (i.e., this is a temporary * session), we could free it now. */ /* * Now we need to construct the action set. In a real application, we * would be gathering the relevant information. Here, we just construct * a fixed action set. */ /* * Add the relevant action attributes. Flags is zero, since we are not * using any callback functions (ENVIRONMENT_FLAG_FUNC) or a regular * expression for action attribute names (ENVIRONMENT_FLAG_REGEX). */ if (kn_add_action(sessionid, "app_domain", "test application", 0) == -1) { switch (keynote_errno) { case ERROR_SYNTAX: fprintf(stderr, "Invalid name action attribute name " "[app_domain]\n"); break; case ERROR_MEMORY: fprintf(stderr, "Out of memory adding action attribute " "[app_domain = \"test application\"]\n"); break; case ERROR_NOTFOUND: fprintf(stderr, "Session %d not found while adding action " "attribute [app_domain = \"test application\"]\n", sessionid); break; default: fprintf(stderr, "Unspecified error %d (shouldn't happen) " "while adding action attribute [app_domain = " "\"test application\"]\n", keynote_errno); break; } } if (kn_add_action(sessionid, "some_num", "1", 0) == -1) { switch (keynote_errno) { case ERROR_SYNTAX: fprintf(stderr, "Invalid name action attribute name " "[some_num]\n"); break; case ERROR_MEMORY: fprintf(stderr, "Out of memory adding action attribute " "[some_num = \"1\"]\n"); break; case ERROR_NOTFOUND: fprintf(stderr, "Session %d not found while adding action " "attribute [some_num = \"1\"]\n", sessionid); break; default: fprintf(stderr, "Unspecified error %d (shouldn't happen) " "while adding action attribute [some_num = \"1\"]", keynote_errno); break; } } if (kn_add_action(sessionid, "some_var", "some other value", 0) == -1) { switch (keynote_errno) { case ERROR_SYNTAX: fprintf(stderr, "Invalid name action attribute name " "[some_var]\n"); break; case ERROR_MEMORY: fprintf(stderr, "Out of memory adding action attribute " "[some_var = \"some other value\"]\n"); break; case ERROR_NOTFOUND: fprintf(stderr, "Session %d not found while adding action " "attribute [some_var = \"some other value\"]\n", sessionid); break; default: fprintf(stderr, "Unspecified error %d (shouldn't happen) " "while adding action attribute [some_var = " "\"some other value\"]\n", keynote_errno); break; } } if (kn_add_action(sessionid, "another_var", "foo", 0) == -1) { switch (keynote_errno) { case ERROR_SYNTAX: fprintf(stderr, "Invalid name action attribute name " "[another_var]\n"); break; case ERROR_MEMORY: fprintf(stderr, "Out of memory adding action attribute " "[another_var = \"foo\"]\n"); break; case ERROR_NOTFOUND: fprintf(stderr, "Session %d not found while adding action " "attribute [another_var = \"foo\"]\n", sessionid); break; default: fprintf(stderr, "Unspecified error %d (shouldn't happen) " "while adding action attribute [another_var = " "\"foo\"]\n", keynote_errno); break; } } /* Set the return values for this application -- just "false" and "true" */ returnvalues[0] = "false"; returnvalues[1] = "true"; /* Just do the query. */ j = kn_do_query(sessionid, returnvalues, NUM_RETURN_VALUES); if (j == -1) { switch (keynote_errno) { case ERROR_MEMORY: fprintf(stderr, "Out of memory while performing authorization " "query.\n"); break; case ERROR_NOTFOUND: fprintf(stderr, "Session %d not found while performing " "authorization query.\n", sessionid); break; default: fprintf(stderr, "Unspecified error %d (shouldn't happen) " "while performing authorization query.\n", keynote_errno); break; } } else { fprintf(stdout, "Return value is [%s]\n", returnvalues[j]); } /* * Once the query is done, we can find what assertions failed in what way. * One way is just going through the list of assertions, as shown here * for assertions that failed due to memory exhaustion. */ j = 0; do { i = kn_get_failed(sessionid, KEYNOTE_ERROR_MEMORY, j++); if (i != -1) fprintf(stderr, "Assertion %d failed due to memory exhaustion.\n", i); } while (i != -1); /* * Another way is to go through the list of failed assertions by deleting * the "first" one. */ do { i = kn_get_failed(sessionid, KEYNOTE_ERROR_SYNTAX, 0); if (i != -1) { fprintf(stderr, "Assertion %d failed due to some syntax error.\n", i); kn_remove_assertion(sessionid, i); /* Delete assertion */ } } while (i != -1); /* * Signature failures, another way. */ for (j = 0, i = kn_get_failed(sessionid, KEYNOTE_ERROR_SIGNATURE, 0); i != -1; i = kn_get_failed(sessionid, KEYNOTE_ERROR_SIGNATURE, j++)) fprintf(stderr, "Failed to verify signature on assertion %d.\n", i); /* * Here's how to find all errors. */ for (i = kn_get_failed(sessionid, KEYNOTE_ERROR_ANY, 0); i != -1; i = kn_get_failed(sessionid, KEYNOTE_ERROR_ANY, 0)) { fprintf(stderr, "Unspecified error in processing assertion %d.\n", i); kn_remove_assertion(sessionid, i); } /* Destroy the session, freeing all allocated memory. */ kn_close(sessionid); exit(0); }