[002b25a] | 1 | #include <assert.h> |
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[39fed7c] | 2 | #include <err.h> |
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[002b25a] | 3 | #include <termios.h> |
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[39fed7c] | 4 | #include <time.h> |
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[002b25a] | 5 | |
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[adc86c3] | 6 | // include the GNU extension of asprintf |
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| 7 | #define _GNU_SOURCE |
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| 8 | #include <stdio.h> |
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| 9 | |
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[3a33812] | 10 | #include "libcreddy_common.h" |
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[002b25a] | 11 | |
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[39fed7c] | 12 | #define KEY_SUFFIX "_private.pem" |
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| 13 | #define CERT_SUFFIX "_ID.pem" |
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[002b25a] | 14 | /* Size of password memory allocation */ |
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| 15 | #define PWLEN 128 |
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| 16 | |
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| 17 | // |
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| 18 | // ID object |
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| 19 | // |
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| 20 | struct _creddy_id_t { |
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| 21 | char *keyid; |
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| 22 | char *cn; |
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| 23 | certificate_t *cert; |
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| 24 | private_key_t *key; |
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[2a20fa0] | 25 | |
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| 26 | int refcount; |
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[1283aa3] | 27 | }; |
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[002b25a] | 28 | |
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| 29 | /* Callback configuration */ |
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| 30 | struct cb_opts { |
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[1283aa3] | 31 | bool use_prompt; /* Print a prompt to stderr */ |
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| 32 | bool use_echo; /* If true, turn off input echo on stdin */ |
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| 33 | unsigned int tries; /* Number of attempts allowed */ |
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| 34 | char prompt[20]; /* The prompt to display if use_echo is true */ |
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[002b25a] | 35 | }; |
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| 36 | |
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[39fed7c] | 37 | static char *_get_keyid(certificate_t *cert); |
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[002b25a] | 38 | static chunk_t _passphrase_callback(void *user, int try); |
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[39fed7c] | 39 | static private_key_t *_generate_key(void); |
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| 40 | static certificate_t *_generate_cert(private_key_t *private, char *cn, int validity); |
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| 41 | static void _encode_base64(FILE *out, chunk_t encoding); |
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[002b25a] | 42 | |
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| 43 | /** |
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[956e1c6] | 44 | * Helper function for building a creddy ID from a cert. Used by |
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| 45 | * creddy_id_from_* |
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[002b25a] | 46 | */ |
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[956e1c6] | 47 | creddy_id_t *_creddy_id_from_cert(certificate_t *cert) { |
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[3a33812] | 48 | creddy_id_t *id = creddy_xmalloc(sizeof(creddy_id_t)); |
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[002b25a] | 49 | id->keyid = NULL; |
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| 50 | id->cn = NULL; |
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| 51 | id->cert = cert; |
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| 52 | id->key = NULL; |
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| 53 | |
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[39fed7c] | 54 | id->keyid = _get_keyid(id->cert); |
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[002b25a] | 55 | |
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[4f114cc] | 56 | // get the CN from the cert |
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| 57 | id_part_t type; |
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| 58 | chunk_t data; |
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| 59 | |
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| 60 | identification_t *cert_id = id->cert->get_subject(id->cert); |
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| 61 | enumerator_t *id_enum = cert_id->create_part_enumerator(cert_id); |
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| 62 | while (id_enum->enumerate(id_enum, &type, &data)) |
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| 63 | if (type == ID_PART_RDN_CN) { |
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| 64 | id->cn = creddy_xmalloc(data.len + 1); |
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| 65 | memcpy(id->cn, data.ptr, data.len); |
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| 66 | id->cn[data.len] = 0; |
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| 67 | } |
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| 68 | id_enum->destroy(id_enum); |
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[002b25a] | 69 | |
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[2a20fa0] | 70 | id->refcount = 1; |
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| 71 | |
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[002b25a] | 72 | return id; |
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| 73 | } |
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| 74 | |
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[956e1c6] | 75 | /** |
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| 76 | * Load an ID cert from a file. |
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| 77 | */ |
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| 78 | creddy_id_t *creddy_id_from_file(char *filename) { |
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| 79 | libabac_init(); |
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| 80 | |
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| 81 | certificate_t *cert = lib->creds->create(lib->creds, |
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| 82 | CRED_CERTIFICATE, CERT_X509, |
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| 83 | BUILD_FROM_FILE, filename, |
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| 84 | BUILD_X509_FLAG, X509_AA, |
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| 85 | BUILD_END |
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| 86 | ); |
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| 87 | |
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| 88 | if (cert == NULL) |
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| 89 | return NULL; |
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| 90 | |
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| 91 | return _creddy_id_from_cert(cert); |
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| 92 | } |
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| 93 | |
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| 94 | /** |
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| 95 | * Load an ID cert from a chunk. |
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| 96 | */ |
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| 97 | creddy_id_t *creddy_id_from_chunk(abac_chunk_t achunk) { |
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| 98 | chunk_t chunk = { .ptr = achunk.ptr, .len = achunk.len }; |
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| 99 | |
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| 100 | libabac_init(); |
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| 101 | |
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| 102 | certificate_t *cert = lib->creds->create(lib->creds, |
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| 103 | CRED_CERTIFICATE, CERT_X509, |
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| 104 | BUILD_BLOB_ASN1_DER, chunk, |
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| 105 | BUILD_X509_FLAG, X509_AA, |
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| 106 | BUILD_END |
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| 107 | ); |
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| 108 | |
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| 109 | if (cert == NULL) |
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| 110 | return NULL; |
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| 111 | |
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| 112 | return _creddy_id_from_cert(cert); |
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| 113 | } |
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[39fed7c] | 114 | |
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| 115 | /** |
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| 116 | * Load private key for a cert. |
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| 117 | */ |
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[002b25a] | 118 | int creddy_id_load_privkey(creddy_id_t *id, char *filename) { |
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| 119 | struct cb_opts c_opts = { 1, 0, 3, "Key password:" }; |
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| 120 | |
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| 121 | assert(id != NULL); |
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| 122 | |
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[11e3eb7] | 123 | libabac_init(); |
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[9d767d1] | 124 | |
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[002b25a] | 125 | // load signer key |
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| 126 | private_key_t *key = lib->creds->create(lib->creds, |
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| 127 | CRED_PRIVATE_KEY, KEY_RSA, |
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| 128 | BUILD_FROM_FILE, filename, |
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[1283aa3] | 129 | /* Ask for password if the key's encrypted */ |
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| 130 | BUILD_PASSPHRASE_CALLBACK, _passphrase_callback, &c_opts, |
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[002b25a] | 131 | BUILD_END |
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| 132 | ); |
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| 133 | if (key == NULL) |
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| 134 | return 0; |
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| 135 | |
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| 136 | id->key = key; |
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[39fed7c] | 137 | return 1; |
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| 138 | } |
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| 139 | |
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| 140 | /** |
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| 141 | * Generate an ID with the specified CN and validity. |
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[1283aa3] | 142 | * |
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[00d21a1] | 143 | * validity is measured in seconds (as of 0.2.0) |
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[39fed7c] | 144 | */ |
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| 145 | int creddy_id_generate(creddy_id_t **ret, char *cn, int validity) { |
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[3a33812] | 146 | if (cn == NULL || !creddy_clean_name(cn)) |
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[39fed7c] | 147 | return CREDDY_GENERATE_INVALID_CN; |
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| 148 | |
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| 149 | if (validity < 0) |
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| 150 | return CREDDY_GENERATE_INVALID_VALIDITY; |
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| 151 | |
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[3a33812] | 152 | creddy_id_t *id = creddy_xmalloc(sizeof(creddy_id_t)); |
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[39fed7c] | 153 | |
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[3a33812] | 154 | id->cn = creddy_xstrdup(cn); |
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[39fed7c] | 155 | id->key = _generate_key(); |
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| 156 | id->cert = _generate_cert(id->key, cn, validity); |
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| 157 | id->keyid = _get_keyid(id->cert); |
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| 158 | |
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[2a20fa0] | 159 | id->refcount = 1; |
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| 160 | |
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[39fed7c] | 161 | *ret = id; |
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| 162 | return CREDDY_SUCCESS; |
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[002b25a] | 163 | } |
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| 164 | |
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| 165 | char *creddy_id_keyid(creddy_id_t *id) { |
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| 166 | assert(id != NULL); |
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| 167 | |
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| 168 | return id->keyid; |
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| 169 | } |
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| 170 | |
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[adc86c3] | 171 | /** |
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| 172 | * Get the issuer of an ID cert. |
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| 173 | * Returns a malloc'd string that must be free'd. |
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| 174 | */ |
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| 175 | char *creddy_id_issuer(creddy_id_t *id) { |
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| 176 | char *ret; |
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| 177 | int rv = asprintf(&ret, "%Y", id->cert->get_issuer(id->cert)); |
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| 178 | |
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| 179 | if (rv < 0) |
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| 180 | err(1, "couldn't malloc string for issuer\n"); |
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| 181 | |
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| 182 | return ret; |
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| 183 | } |
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| 184 | |
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[b19d1f0] | 185 | /** |
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| 186 | * Gets the subject DN of an ID cert. |
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| 187 | * Returns a malloc'd string that must be free'd. |
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| 188 | */ |
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| 189 | char *creddy_id_subject(creddy_id_t *id) { |
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| 190 | char *ret; |
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| 191 | int rv = asprintf(&ret, "%Y", id->cert->get_subject(id->cert)); |
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| 192 | |
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| 193 | if (rv < 0) |
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| 194 | err(1, "couldn't malloc string for subject\n"); |
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| 195 | |
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| 196 | return ret; |
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| 197 | } |
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| 198 | |
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[405bba3] | 199 | /** |
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| 200 | * Get the validity period. |
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| 201 | */ |
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| 202 | void creddy_id_validity(creddy_id_t *id, time_t *not_before, time_t *not_after) { |
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| 203 | id->cert->get_validity(id->cert, NULL, not_before, not_after); |
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| 204 | } |
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| 205 | |
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[002b25a] | 206 | certificate_t *creddy_id_cert(creddy_id_t *id) { |
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| 207 | assert(id != NULL); |
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| 208 | |
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| 209 | return id->cert; |
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| 210 | } |
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| 211 | |
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| 212 | private_key_t *creddy_id_privkey(creddy_id_t *id) { |
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| 213 | assert(id != NULL); |
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| 214 | |
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| 215 | return id->key; |
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| 216 | } |
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| 217 | |
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[39fed7c] | 218 | /** |
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| 219 | * Get the default filename for the cert. Value must be freed by caller. |
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| 220 | */ |
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| 221 | char *creddy_id_cert_filename(creddy_id_t *id) { |
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| 222 | assert(id != NULL); |
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| 223 | assert(id->cn != NULL); |
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| 224 | |
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| 225 | // malloc the filename |
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| 226 | int len = strlen(id->cn) + strlen(CERT_SUFFIX) + 1; |
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[3a33812] | 227 | char *filename = creddy_xmalloc(len); |
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[39fed7c] | 228 | sprintf(filename, "%s" CERT_SUFFIX, id->cn); |
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| 229 | |
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| 230 | return filename; |
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| 231 | } |
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| 232 | |
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| 233 | /** |
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| 234 | * Write the ID cert to an open file pointer. |
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| 235 | */ |
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| 236 | void creddy_id_write_cert(creddy_id_t *id, FILE *out) { |
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| 237 | assert(id != NULL); |
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| 238 | |
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| 239 | chunk_t encoding = id->cert->get_encoding(id->cert); |
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| 240 | _encode_base64(out, encoding); |
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| 241 | free(encoding.ptr); |
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| 242 | } |
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| 243 | |
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| 244 | /** |
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| 245 | * Default private key filename. Value must be freed by caller. |
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| 246 | */ |
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| 247 | char *creddy_id_privkey_filename(creddy_id_t *id) { |
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| 248 | assert(id != NULL); |
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| 249 | assert(id->cn != NULL); |
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| 250 | |
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| 251 | // malloc the filename |
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| 252 | int len = strlen(id->cn) + strlen(KEY_SUFFIX) + 1; |
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[3a33812] | 253 | char *filename = creddy_xmalloc(len); |
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[39fed7c] | 254 | sprintf(filename, "%s" KEY_SUFFIX, id->cn); |
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| 255 | |
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| 256 | return filename; |
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| 257 | } |
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| 258 | |
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| 259 | /** |
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| 260 | * Write the private key to a file. |
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[d56e51b] | 261 | * Returns false if there's no private key loaded |
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[39fed7c] | 262 | */ |
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[d56e51b] | 263 | int creddy_id_write_privkey(creddy_id_t *id, FILE *out) { |
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[39fed7c] | 264 | int ret; |
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| 265 | chunk_t encoding; |
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| 266 | |
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| 267 | assert(id != NULL); |
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| 268 | |
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[d56e51b] | 269 | if (id->key == NULL) |
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| 270 | return 0; |
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| 271 | |
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[39fed7c] | 272 | ret = id->key->get_encoding(id->key, KEY_PRIV_PEM, &encoding); |
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| 273 | if (!ret) |
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| 274 | errx(1, "Couldn't encode private key"); |
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| 275 | |
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| 276 | fwrite(encoding.ptr, encoding.len, 1, out); |
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| 277 | |
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| 278 | free(encoding.ptr); |
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[d56e51b] | 279 | return 1; |
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[39fed7c] | 280 | } |
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| 281 | |
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[11e3eb7] | 282 | /** |
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| 283 | * Get a DER-encoded chunk representing the cert. |
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| 284 | */ |
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| 285 | abac_chunk_t creddy_id_cert_chunk(creddy_id_t *id) { |
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| 286 | chunk_t encoding = id->cert->get_encoding(id->cert); |
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| 287 | abac_chunk_t ret = { encoding.ptr, encoding.len }; |
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| 288 | return ret; |
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| 289 | } |
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| 290 | |
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[2a20fa0] | 291 | /** |
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| 292 | * Copy a creddy ID. Actually just increases its reference count. |
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| 293 | */ |
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| 294 | creddy_id_t *creddy_id_dup(creddy_id_t *id) { |
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| 295 | ++id->refcount; |
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[8f58012] | 296 | return id; |
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[2a20fa0] | 297 | } |
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| 298 | |
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[002b25a] | 299 | void creddy_id_free(creddy_id_t *id) { |
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| 300 | if (id == NULL) |
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| 301 | return; |
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| 302 | |
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[2a20fa0] | 303 | --id->refcount; |
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| 304 | if (id->refcount > 0) |
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| 305 | return; |
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| 306 | |
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| 307 | // free once the reference count reaches 0 |
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[002b25a] | 308 | DESTROY_IF(id->cert); |
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| 309 | DESTROY_IF(id->key); |
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| 310 | |
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| 311 | free(id->keyid); |
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| 312 | free(id); |
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| 313 | } |
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| 314 | |
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| 315 | // |
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| 316 | // Helper functions below |
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| 317 | // |
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| 318 | |
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[39fed7c] | 319 | static char *_get_keyid(certificate_t *cert) { |
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| 320 | // get the keyid |
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| 321 | x509_t *x509 = (x509_t *)cert; |
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| 322 | chunk_t keyid = x509->get_subjectKeyIdentifier(x509); |
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| 323 | chunk_t string = chunk_to_hex(keyid, NULL, 0); |
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| 324 | return (char *)string.ptr; |
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| 325 | } |
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| 326 | |
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[002b25a] | 327 | static chunk_t _passphrase_callback(void *user, int try) { |
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| 328 | /* Get a password from stdin and return it as a chunk_t. If too many tries |
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| 329 | * have occurred or there is any other problem, return an empty chunk_t, |
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| 330 | * which libstrongswan takes as giving up. The chunk is alloated here |
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| 331 | * (inside getline), and presumably freed by libstrongswan. User points to |
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| 332 | * a cb_opts struct, which affects this routine in the obvious ways. |
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| 333 | */ |
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| 334 | /* Configuration options */ |
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| 335 | struct cb_opts *opts = (struct cb_opts *) user; |
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[1283aa3] | 336 | chunk_t rv = chunk_empty; /* Return value, starts empty */ |
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[002b25a] | 337 | |
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| 338 | if (try -1 < opts->tries ) { |
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[1283aa3] | 339 | struct termios t; /* Terminal settings */ |
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| 340 | size_t len = 0; /* Length of string from getline */ |
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| 341 | tcflag_t orig = 0; /* Holds the original local flags (echo in here) */ |
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| 342 | |
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| 343 | if (!opts->use_echo) { |
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| 344 | /* Use tc{get,set}attr to turn echo off and restore the intial |
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| 345 | * echo settings */ |
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| 346 | if (!tcgetattr(0, &t)) { |
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| 347 | orig = t.c_lflag; |
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| 348 | |
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| 349 | t.c_lflag &= ~ECHO; |
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| 350 | if ( tcsetattr(0, TCSANOW, &t) ) { |
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| 351 | perror("Cannot turn off echo"); |
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| 352 | return rv; |
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| 353 | } |
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| 354 | } |
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| 355 | else { |
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| 356 | perror("Cannot turn get attributes to off echo"); |
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| 357 | return rv; |
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| 358 | } |
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| 359 | } |
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| 360 | if (opts->use_prompt) printf("%s", opts->prompt); |
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| 361 | |
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| 362 | /* Because rv.ptr starts as NULL, getline allocates memory. The size |
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| 363 | * of the allocation returns in rv.len and the size of the string |
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| 364 | * (including newline and NUL) is in len. */ |
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| 365 | if ((rv.ptr = (u_char *) malloc(rv.len = PWLEN))) { |
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| 366 | if ( fgets(rv.ptr, rv.len, stdin) ) { |
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| 367 | /* Readjust the chunk_t's len field to the size of the string |
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| 368 | * w/o the newline or NUL */ |
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| 369 | /* would prefer strnlen, but no such luck in FBSD7 or earlier*/ |
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| 370 | size_t len = strlen(rv.ptr); |
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| 371 | |
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| 372 | if (rv.ptr[len-2] == '\n') rv.len = len-2; |
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| 373 | else rv.len = len -1; |
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| 374 | } |
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| 375 | else { |
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| 376 | /* Read failed. Deallocate and clear rv */ |
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| 377 | free(rv.ptr); |
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| 378 | rv = chunk_empty; |
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| 379 | } |
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| 380 | } |
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| 381 | else { |
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| 382 | /* Failed malloc. Restore rv to empty and return it */ |
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| 383 | perror("malloc"); |
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| 384 | rv = chunk_empty; |
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| 385 | return rv; |
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| 386 | } |
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| 387 | |
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| 388 | if (!opts->use_echo ) { |
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| 389 | /* Pop echo beck to its original setting. */ |
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| 390 | t.c_lflag = orig; |
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| 391 | |
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| 392 | if ( tcsetattr(0, TCSANOW, &t) ) |
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| 393 | perror("Cannot restore echo setting?"); |
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| 394 | |
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| 395 | if (opts->use_prompt) printf("\n"); |
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| 396 | } |
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[002b25a] | 397 | } |
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| 398 | else fprintf(stderr, "Too many tries (%d)", try-1); |
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| 399 | return rv; |
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| 400 | } |
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[39fed7c] | 401 | |
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| 402 | /** |
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| 403 | * Generate a private key. |
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| 404 | */ |
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| 405 | static private_key_t *_generate_key(void) { |
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| 406 | private_key_t *key; |
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[ff81abb] | 407 | libabac_init(); |
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[39fed7c] | 408 | |
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| 409 | // generate the key |
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| 410 | key = lib->creds->create( |
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| 411 | lib->creds, |
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| 412 | CRED_PRIVATE_KEY, KEY_RSA, |
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| 413 | BUILD_KEY_SIZE, 2048, |
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| 414 | BUILD_END |
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| 415 | ); |
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| 416 | if (key == NULL) |
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| 417 | errx(1, "Key generation failed"); |
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| 418 | |
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| 419 | return key; |
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| 420 | } |
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| 421 | |
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| 422 | static char *_create_dn(char *cn) { |
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| 423 | |
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| 424 | #define DN "cn=" |
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| 425 | |
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[3a33812] | 426 | char *dn = creddy_xmalloc(sizeof(DN) + strlen(cn)); |
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[39fed7c] | 427 | memcpy(dn, DN, sizeof(DN)); |
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| 428 | strcat(dn, cn); |
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| 429 | |
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| 430 | return dn; |
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| 431 | } |
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| 432 | |
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| 433 | /** |
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| 434 | * Generate certificate. |
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[00d21a1] | 435 | * |
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| 436 | * validity is measured in seconds (as of 0.2.0) |
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[39fed7c] | 437 | */ |
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| 438 | static certificate_t *_generate_cert(private_key_t *private, char *cn, int validity) { |
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| 439 | // build the DN |
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| 440 | char *dn_string = _create_dn(cn); |
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[ff81abb] | 441 | libabac_init(); |
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| 442 | |
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[39fed7c] | 443 | identification_t *id = identification_create_from_string(dn_string); |
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| 444 | if (id == NULL) |
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| 445 | errx(1, "couldn't create ID from DN %s", dn_string); |
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| 446 | free(dn_string); |
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| 447 | |
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| 448 | // get the public key |
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| 449 | public_key_t *public = private->get_public_key(private); |
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| 450 | if (public == NULL) |
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| 451 | errx(1, "couldn't get public key from private key"); |
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| 452 | |
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| 453 | // create a serial (stolen from strongswan pki) |
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| 454 | rng_t *rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK); |
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| 455 | if (!rng) |
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| 456 | errx(1, "no random number generator"); |
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| 457 | |
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| 458 | // random serial |
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| 459 | chunk_t serial = creddy_generate_serial(); |
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| 460 | |
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| 461 | // validity period |
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| 462 | time_t not_before = time(NULL); |
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[00d21a1] | 463 | time_t not_after = not_before + validity; |
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[39fed7c] | 464 | |
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| 465 | // create! |
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| 466 | certificate_t *cert = lib->creds->create(lib->creds, |
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| 467 | CRED_CERTIFICATE, CERT_X509, |
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| 468 | BUILD_SIGNING_KEY, private, |
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| 469 | BUILD_PUBLIC_KEY, public, |
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| 470 | BUILD_SUBJECT, id, |
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| 471 | BUILD_NOT_BEFORE_TIME, not_before, |
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| 472 | BUILD_NOT_AFTER_TIME, not_after, |
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| 473 | BUILD_SERIAL, serial, |
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| 474 | BUILD_DIGEST_ALG, HASH_SHA1, |
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| 475 | BUILD_X509_FLAG, X509_CA, |
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| 476 | BUILD_PATHLEN, X509_NO_PATH_LEN_CONSTRAINT, |
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| 477 | BUILD_END |
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| 478 | ); |
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| 479 | if (cert == NULL) |
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| 480 | errx(1, "couldn't build cert :("); |
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| 481 | |
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| 482 | DESTROY_IF(id); |
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| 483 | DESTROY_IF(public); |
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| 484 | free(serial.ptr); |
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| 485 | |
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| 486 | return cert; |
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| 487 | } |
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| 488 | |
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| 489 | #define BYTES_PER_LINE 64 |
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| 490 | |
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| 491 | // thx libstrongswan |
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| 492 | static void _encode_base64(FILE *out, chunk_t encoding) { |
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| 493 | int start; |
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| 494 | |
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| 495 | chunk_t b64 = chunk_to_base64(encoding, NULL); |
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| 496 | |
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| 497 | fprintf(out, "-----BEGIN CERTIFICATE-----\n"); |
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| 498 | |
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| 499 | for (start = 0; start < b64.len; start += BYTES_PER_LINE) { |
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| 500 | int left = b64.len - start; |
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| 501 | int len = left < BYTES_PER_LINE ? left : BYTES_PER_LINE; |
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| 502 | fwrite(b64.ptr + start, len, 1, out); |
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| 503 | fprintf(out, "\n"); |
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| 504 | } |
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| 505 | |
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| 506 | fprintf(out, "-----END CERTIFICATE-----\n"); |
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| 507 | |
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| 508 | free(b64.ptr); |
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| 509 | } |
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