[8bd77b5] | 1 | |
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| 2 | /** |
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| 3 | ** abac_id.c |
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| 4 | **/ |
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| 5 | |
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| 6 | #include <assert.h> |
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| 7 | #include <err.h> |
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| 8 | #include <termios.h> |
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| 9 | #include <time.h> |
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| 10 | |
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| 11 | // include the GNU extension of asprintf |
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| 12 | #define _GNU_SOURCE |
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| 13 | #include <stdio.h> |
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| 14 | #include <err.h> |
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| 15 | |
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| 16 | #include "abac_internal.h" |
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| 17 | #include "abac_util.h" |
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| 18 | |
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| 19 | #define KEY_SUFFIX "_private.pem" |
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| 20 | #define CERT_SUFFIX "_ID.pem" |
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| 21 | /* Size of password memory allocation */ |
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| 22 | #define PWLEN 128 |
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| 23 | |
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| 24 | // |
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| 25 | // abac_id object |
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| 26 | // |
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| 27 | struct _abac_id_t { |
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| 28 | int idtype; /* default to 'keyid' for now */ |
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| 29 | |
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| 30 | char *keyid; /* sha */ |
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| 31 | char *cn; |
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| 32 | |
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| 33 | certificate_t *cert; |
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| 34 | private_key_t *key; |
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| 35 | |
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| 36 | int refcount; |
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| 37 | }; |
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| 38 | |
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| 39 | /* Callback configuration, local */ |
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| 40 | struct cb_opts { |
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| 41 | bool use_prompt; /* Print a prompt to stderr */ |
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| 42 | bool use_echo; /* If true, turn off input echo on stdin */ |
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| 43 | unsigned int tries; /* Number of attempts allowed */ |
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| 44 | char prompt[20]; /* The prompt to display if use_echo is true */ |
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| 45 | }; |
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| 46 | |
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| 47 | /****************************************************************/ |
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| 48 | // |
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| 49 | // Helper functions below |
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| 50 | // |
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| 51 | |
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| 52 | static char *_get_keyid(certificate_t *cert) { |
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| 53 | // get the keyid |
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| 54 | x509_t *x509 = (x509_t *)cert; |
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| 55 | chunk_t keyid = x509->get_subjectKeyIdentifier(x509); |
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| 56 | chunk_t string = chunk_to_hex(keyid, NULL, 0); |
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| 57 | return (char *)string.ptr; |
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| 58 | } |
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| 59 | |
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| 60 | static chunk_t _passphrase_callback(void *user, int try) { |
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| 61 | /* Get a password from stdin and return it as a chunk_t. If too many tries |
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| 62 | * have occurred or there is any other problem, return an empty chunk_t, |
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| 63 | * which libstrongswan takes as giving up. The chunk is alloated here |
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| 64 | * (inside getline), and presumably freed by libstrongswan. User points to |
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| 65 | * a cb_opts struct, which affects this routine in the obvious ways. |
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| 66 | */ |
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| 67 | /* Configuration options */ |
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| 68 | struct cb_opts *opts = (struct cb_opts *) user; |
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| 69 | chunk_t rv = chunk_empty; /* Return value, starts empty */ |
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| 70 | |
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| 71 | if (try -1 < opts->tries ) { |
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| 72 | struct termios t; /* Terminal settings */ |
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| 73 | size_t len = 0; /* Length of string from getline */ |
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| 74 | tcflag_t orig = 0; /* Holds the original local flags (echo in here) */ |
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| 75 | |
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| 76 | if (!opts->use_echo) { |
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| 77 | /* Use tc{get,set}attr to turn echo off and restore the intial |
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| 78 | * echo settings */ |
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| 79 | if (!tcgetattr(0, &t)) { |
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| 80 | orig = t.c_lflag; |
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| 81 | |
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| 82 | t.c_lflag &= ~ECHO; |
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| 83 | if ( tcsetattr(0, TCSANOW, &t) ) { |
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| 84 | perror("Cannot turn off echo"); |
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| 85 | return rv; |
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| 86 | } |
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| 87 | } |
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| 88 | else { |
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| 89 | perror("Cannot turn get attributes to off echo"); |
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| 90 | return rv; |
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| 91 | } |
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| 92 | } |
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| 93 | if (opts->use_prompt) printf("%s", opts->prompt); |
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| 94 | |
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| 95 | /* Because rv.ptr starts as NULL, getline allocates memory. The size |
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| 96 | * of the allocation returns in rv.len and the size of the string |
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| 97 | * (including newline and NUL) is in len. */ |
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| 98 | if ((rv.ptr = (u_char *) malloc(rv.len = PWLEN))) { |
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| 99 | if ( fgets(rv.ptr, rv.len, stdin) ) { |
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| 100 | /* Readjust the chunk_t's len field to the size of the string |
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| 101 | * w/o the newline or NUL */ |
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| 102 | /* would prefer strnlen, but no such luck in FBSD7 or earlier*/ |
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| 103 | size_t len = strlen(rv.ptr); |
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| 104 | |
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| 105 | if (rv.ptr[len-2] == '\n') rv.len = len-2; |
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| 106 | else rv.len = len -1; |
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| 107 | } |
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| 108 | else { |
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| 109 | /* Read failed. Deallocate and clear rv */ |
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| 110 | free(rv.ptr); |
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| 111 | rv = chunk_empty; |
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| 112 | } |
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| 113 | } |
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| 114 | else { |
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| 115 | /* Failed malloc. Restore rv to empty and return it */ |
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| 116 | perror("malloc"); |
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| 117 | rv = chunk_empty; |
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| 118 | return rv; |
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| 119 | } |
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| 120 | |
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| 121 | if (!opts->use_echo ) { |
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| 122 | /* Pop echo beck to its original setting. */ |
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| 123 | t.c_lflag = orig; |
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| 124 | |
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| 125 | if ( tcsetattr(0, TCSANOW, &t) ) |
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| 126 | perror("Cannot restore echo setting?"); |
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| 127 | |
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| 128 | if (opts->use_prompt) printf("\n"); |
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| 129 | } |
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| 130 | } |
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| 131 | else fprintf(stderr, "Too many tries (%d)", try-1); |
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| 132 | return rv; |
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| 133 | } |
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| 134 | |
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| 135 | /** |
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| 136 | * Generate a private key. |
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| 137 | */ |
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| 138 | static private_key_t *_generate_key(void) { |
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| 139 | private_key_t *key; |
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| 140 | libabac_init(); |
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| 141 | |
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| 142 | // generate the key |
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| 143 | key = lib->creds->create( |
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| 144 | lib->creds, |
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| 145 | CRED_PRIVATE_KEY, KEY_RSA, |
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| 146 | BUILD_KEY_SIZE, 2048, |
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| 147 | BUILD_END |
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| 148 | ); |
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| 149 | if (key == NULL) |
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| 150 | errx(1, "Key generation failed"); |
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| 151 | |
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| 152 | return key; |
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| 153 | } |
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| 154 | |
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| 155 | static char *_create_dn(char *cn) { |
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| 156 | |
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| 157 | #define DN "cn=" |
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| 158 | |
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| 159 | char *dn = abac_xmalloc(sizeof(DN) + strlen(cn)); |
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| 160 | memcpy(dn, DN, sizeof(DN)); |
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| 161 | strcat(dn, cn); |
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| 162 | |
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| 163 | return dn; |
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| 164 | } |
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| 165 | |
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| 166 | /** |
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| 167 | * Generate certificate. |
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| 168 | * |
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| 169 | * validity is measured in seconds (as of 0.2.0) |
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| 170 | */ |
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| 171 | static certificate_t *_generate_cert(private_key_t *private, char *cn, int validity) { |
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| 172 | // build the DN |
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| 173 | char *dn_string = _create_dn(cn); |
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| 174 | libabac_init(); |
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| 175 | |
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| 176 | identification_t *id = identification_create_from_string(dn_string); |
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| 177 | if (id == NULL) |
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| 178 | errx(1, "couldn't create ID from DN %s", dn_string); |
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| 179 | free(dn_string); |
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| 180 | |
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| 181 | // get the public key |
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| 182 | public_key_t *public = private->get_public_key(private); |
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| 183 | if (public == NULL) |
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| 184 | errx(1, "couldn't get public key from private key"); |
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| 185 | |
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| 186 | // create a serial (stolen from strongswan pki) |
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| 187 | rng_t *rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK); |
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| 188 | if (!rng) |
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| 189 | errx(1, "no random number generator"); |
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| 190 | |
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| 191 | // random serial |
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| 192 | chunk_t serial = abac_generate_serial(); |
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| 193 | |
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| 194 | // validity period |
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| 195 | time_t not_before = time(NULL); |
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| 196 | time_t not_after = not_before + validity; |
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| 197 | |
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| 198 | // create! |
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| 199 | certificate_t *cert = lib->creds->create(lib->creds, |
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| 200 | CRED_CERTIFICATE, CERT_X509, |
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| 201 | BUILD_SIGNING_KEY, private, |
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| 202 | BUILD_PUBLIC_KEY, public, |
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| 203 | BUILD_SUBJECT, id, |
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| 204 | BUILD_NOT_BEFORE_TIME, not_before, |
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| 205 | BUILD_NOT_AFTER_TIME, not_after, |
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| 206 | BUILD_SERIAL, serial, |
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| 207 | BUILD_DIGEST_ALG, HASH_SHA1, |
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| 208 | BUILD_X509_FLAG, X509_CA, |
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| 209 | BUILD_PATHLEN, X509_NO_PATH_LEN_CONSTRAINT, |
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| 210 | BUILD_END |
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| 211 | ); |
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| 212 | if (cert == NULL) |
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| 213 | errx(1, "couldn't build cert :("); |
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| 214 | |
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| 215 | DESTROY_IF(id); |
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| 216 | DESTROY_IF(public); |
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| 217 | free(serial.ptr); |
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| 218 | |
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| 219 | return cert; |
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| 220 | } |
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| 221 | |
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| 222 | #define BYTES_PER_LINE 64 |
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| 223 | |
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| 224 | // thx libstrongswan |
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| 225 | static void _encode_base64(FILE *out, chunk_t encoding) { |
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| 226 | int start; |
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| 227 | |
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| 228 | chunk_t b64 = chunk_to_base64(encoding, NULL); |
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| 229 | |
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| 230 | fprintf(out, "-----BEGIN CERTIFICATE-----\n"); |
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| 231 | |
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| 232 | for (start = 0; start < b64.len; start += BYTES_PER_LINE) { |
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| 233 | int left = b64.len - start; |
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| 234 | int len = left < BYTES_PER_LINE ? left : BYTES_PER_LINE; |
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| 235 | fwrite(b64.ptr + start, len, 1, out); |
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| 236 | fprintf(out, "\n"); |
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| 237 | } |
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| 238 | |
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| 239 | fprintf(out, "-----END CERTIFICATE-----\n"); |
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| 240 | |
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| 241 | free(b64.ptr); |
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| 242 | } |
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| 243 | /****************************************************************/ |
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| 244 | int abac_id_idtype(abac_id_t *id) |
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| 245 | { |
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| 246 | assert(id != NULL); |
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| 247 | return id->idtype; |
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| 248 | } |
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| 249 | |
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| 250 | char *abac_id_keyid(abac_id_t *id) { |
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| 251 | assert(id != NULL); |
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| 252 | return id->keyid; |
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| 253 | } |
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| 254 | |
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| 255 | char *abac_id_cn(abac_id_t *id) { |
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| 256 | assert(id != NULL); |
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| 257 | return id->cn; |
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| 258 | } |
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| 259 | |
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| 260 | /** |
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| 261 | * Get the issuer of an ID cert. |
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| 262 | * Returns a malloc'd string that must be free'd. |
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| 263 | */ |
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| 264 | char *abac_id_issuer(abac_id_t *id) { |
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| 265 | char *ret; |
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| 266 | int rv = asprintf(&ret, "%Y", id->cert->get_issuer(id->cert)); |
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| 267 | |
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| 268 | if (rv < 0) |
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| 269 | err(1, "couldn't malloc string for issuer\n"); |
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| 270 | |
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| 271 | return ret; |
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| 272 | } |
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| 273 | |
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| 274 | int abac_id_lastone(abac_id_t *ptr) |
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| 275 | { |
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| 276 | assert(ptr); |
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| 277 | if(ptr->refcount == 1) |
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| 278 | return 1; |
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| 279 | return 0; |
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| 280 | } |
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| 281 | |
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| 282 | |
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| 283 | /** |
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| 284 | * Gets the subject DN of an ID cert. |
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| 285 | * Returns a malloc'd string that must be free'd. |
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| 286 | */ |
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| 287 | char *abac_id_subject(abac_id_t *id) { |
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| 288 | char *ret; |
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| 289 | int rv = asprintf(&ret, "%Y", id->cert->get_subject(id->cert)); |
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| 290 | |
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| 291 | if (rv < 0) |
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| 292 | err(1, "couldn't malloc string for subject\n"); |
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| 293 | |
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| 294 | return ret; |
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| 295 | } |
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| 296 | |
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| 297 | /** |
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| 298 | * Get the validity period. |
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| 299 | */ |
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| 300 | void abac_id_validity(abac_id_t *id, time_t *not_before, time_t *not_after) { |
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| 301 | id->cert->get_validity(id->cert, NULL, not_before, not_after); |
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| 302 | } |
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| 303 | |
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| 304 | certificate_t *abac_id_cert(abac_id_t *id) { |
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| 305 | assert(id != NULL); |
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| 306 | |
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| 307 | return id->cert; |
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| 308 | } |
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| 309 | |
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| 310 | private_key_t *abac_id_privkey(abac_id_t *id) { |
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| 311 | assert(id != NULL); |
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| 312 | |
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| 313 | return id->key; |
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| 314 | } |
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| 315 | |
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| 316 | int abac_id_has_privkey(abac_id_t *id) { |
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| 317 | if(id->key !=0) |
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| 318 | return 1; |
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| 319 | return 0; |
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| 320 | } |
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| 321 | |
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| 322 | |
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| 323 | /** |
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| 324 | * Write the ID cert to an open file pointer. |
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| 325 | */ |
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| 326 | void abac_id_write_cert(abac_id_t *id, FILE *out) { |
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| 327 | assert(id != NULL); |
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| 328 | |
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| 329 | chunk_t encoding = id->cert->get_encoding(id->cert); |
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| 330 | _encode_base64(out, encoding); |
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| 331 | free(encoding.ptr); |
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| 332 | } |
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| 333 | |
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| 334 | /** |
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| 335 | * Write the private key to a file. |
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| 336 | * Returns false if there's no private key loaded |
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| 337 | */ |
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| 338 | int abac_id_write_privkey(abac_id_t *id, FILE *out) { |
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| 339 | int ret; |
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| 340 | chunk_t encoding; |
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| 341 | |
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| 342 | assert(id != NULL); |
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| 343 | |
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| 344 | if (id->key == NULL) |
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| 345 | return 0; |
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| 346 | |
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| 347 | ret = id->key->get_encoding(id->key, KEY_PRIV_PEM, &encoding); |
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| 348 | if (!ret) |
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| 349 | errx(1, "Couldn't encode private key"); |
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| 350 | |
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| 351 | fwrite(encoding.ptr, encoding.len, 1, out); |
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| 352 | |
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| 353 | free(encoding.ptr); |
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| 354 | return 1; |
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| 355 | } |
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| 356 | |
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| 357 | /** |
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| 358 | * Get a DER-encoded chunk representing the cert. |
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| 359 | */ |
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| 360 | abac_chunk_t abac_id_cert_chunk(abac_id_t *id) { |
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| 361 | assert(id->cert); |
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| 362 | chunk_t encoding = id->cert->get_encoding(id->cert); |
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| 363 | abac_chunk_t ret = { encoding.ptr, encoding.len }; |
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| 364 | return ret; |
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| 365 | } |
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| 366 | |
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| 367 | /** |
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| 368 | * Copy an abac ID. Actually just increases its reference count. |
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| 369 | */ |
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| 370 | abac_id_t *abac_id_dup(abac_id_t *id) { |
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| 371 | ++id->refcount; |
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| 372 | return id; |
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| 373 | } |
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| 374 | |
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| 375 | void abac_id_free(abac_id_t *id) { |
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| 376 | if (id == NULL) |
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| 377 | return; |
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| 378 | |
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| 379 | --id->refcount; |
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| 380 | if (id->refcount > 0) |
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| 381 | return; |
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| 382 | |
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| 383 | // free once the reference count reaches 0 |
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| 384 | DESTROY_IF(id->cert); |
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| 385 | DESTROY_IF(id->key); |
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| 386 | |
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| 387 | free(id->keyid); |
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| 388 | free(id->cn); |
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| 389 | free(id); |
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| 390 | } |
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| 391 | |
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| 392 | /****************************************************************/ |
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| 393 | /** |
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| 394 | * Load private key for a cert. |
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| 395 | */ |
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| 396 | int abac_id_load_privkey(abac_id_t *id, char *filename) { |
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| 397 | struct cb_opts c_opts = { 1, 0, 3, "Key password:" }; |
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| 398 | |
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| 399 | assert(id != NULL); |
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| 400 | |
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| 401 | // load signer key |
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| 402 | private_key_t *key = lib->creds->create(lib->creds, |
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| 403 | CRED_PRIVATE_KEY, KEY_RSA, |
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| 404 | BUILD_FROM_FILE, filename, |
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| 405 | /* Ask for password if the key's encrypted */ |
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| 406 | BUILD_PASSPHRASE_CALLBACK, _passphrase_callback, &c_opts, |
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| 407 | BUILD_END |
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| 408 | ); |
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| 409 | if (key == NULL) |
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| 410 | return 0; |
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| 411 | |
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| 412 | id->key = key; |
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| 413 | return 1; |
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| 414 | } |
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| 415 | |
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| 416 | /****************************************************************/ |
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| 417 | abac_id_t *abac_id_new(int idtype,char *keyid, char *cn, |
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| 418 | certificate_t *cert) |
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| 419 | { |
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| 420 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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| 421 | id->idtype = idtype; |
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| 422 | id->keyid = abac_xstrdup(keyid); |
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| 423 | id->cn = abac_xstrdup(cn); |
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| 424 | id->cert = cert; |
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| 425 | id->key = NULL; |
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| 426 | id->refcount = 1; |
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| 427 | return id; |
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| 428 | } |
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| 429 | |
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| 430 | abac_id_t *abac_id_keyid_new(char *keyid, char *cn, certificate_t *cert) |
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| 431 | { |
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| 432 | return abac_id_new(e_KEYID,keyid,cn,cert); |
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| 433 | } |
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| 434 | |
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| 435 | static abac_id_t *_abac_id_from_cert(certificate_t *cert) { |
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| 436 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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| 437 | id->idtype = e_KEYID; |
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| 438 | id->keyid = NULL; |
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| 439 | id->cn = NULL; |
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| 440 | id->cert = cert; |
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| 441 | id->key = NULL; |
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| 442 | |
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| 443 | id->keyid = _get_keyid(id->cert); |
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| 444 | |
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| 445 | // get the CN from the cert |
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| 446 | id_part_t type; |
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| 447 | chunk_t data; |
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| 448 | |
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| 449 | identification_t *cert_id = id->cert->get_subject(id->cert); |
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| 450 | enumerator_t *id_enum = cert_id->create_part_enumerator(cert_id); |
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| 451 | while (id_enum->enumerate(id_enum, &type, &data)) |
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| 452 | if (type == ID_PART_RDN_CN) { |
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| 453 | id->cn = abac_xmalloc(data.len + 1); |
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| 454 | memcpy(id->cn, data.ptr, data.len); |
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| 455 | id->cn[data.len] = 0; |
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| 456 | } |
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| 457 | id_enum->destroy(id_enum); |
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| 458 | |
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| 459 | id->refcount = 1; |
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| 460 | |
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| 461 | return id; |
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| 462 | } |
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| 463 | |
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| 464 | /** |
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| 465 | * Load an ID cert from a file. |
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| 466 | */ |
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| 467 | abac_id_t *abac_id_from_file(char *filename) { |
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| 468 | |
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| 469 | certificate_t *cert = lib->creds->create(lib->creds, |
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| 470 | CRED_CERTIFICATE, CERT_X509, |
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| 471 | BUILD_FROM_FILE, filename, |
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| 472 | BUILD_X509_FLAG, X509_AA, |
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| 473 | BUILD_END |
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| 474 | ); |
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| 475 | |
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| 476 | if (cert == NULL) |
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| 477 | return NULL; |
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| 478 | |
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| 479 | return _abac_id_from_cert(cert); |
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| 480 | } |
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| 481 | |
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| 482 | /** |
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| 483 | * Load an ID cert from a chunk. |
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| 484 | */ |
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| 485 | abac_id_t *abac_id_from_chunk(abac_chunk_t achunk) { |
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| 486 | chunk_t chunk = { .ptr = achunk.ptr, .len = achunk.len }; |
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| 487 | |
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| 488 | certificate_t *cert = lib->creds->create(lib->creds, |
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| 489 | CRED_CERTIFICATE, CERT_X509, |
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| 490 | BUILD_BLOB_ASN1_DER, chunk, |
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| 491 | BUILD_X509_FLAG, X509_AA, |
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| 492 | BUILD_END |
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| 493 | ); |
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| 494 | |
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| 495 | if (cert == NULL) |
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| 496 | return NULL; |
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| 497 | |
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| 498 | return _abac_id_from_cert(cert); |
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| 499 | } |
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| 500 | |
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| 501 | /** |
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| 502 | * Generate an ID with the specified CN and validity. |
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| 503 | * |
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| 504 | * validity is measured in seconds (as of 0.2.0) |
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| 505 | */ |
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| 506 | int abac_id_generate(abac_id_t **ret, char *cn, int validity) { |
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| 507 | if (cn == NULL || !abac_validate_clean_name(cn)) |
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| 508 | return ABAC_ID_GENERATE_INVALID_CN; |
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| 509 | |
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| 510 | if (validity < 0) |
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| 511 | return ABAC_ID_GENERATE_INVALID_VALIDITY; |
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| 512 | |
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| 513 | if (validity == 0) validity = 1080 * 86400; |
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| 514 | |
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| 515 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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| 516 | |
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| 517 | id->idtype = e_KEYID; |
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| 518 | id->cn = abac_xstrdup(cn); |
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| 519 | id->key = _generate_key(); |
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| 520 | id->cert = _generate_cert(id->key, cn, validity); |
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| 521 | id->keyid = _get_keyid(id->cert); |
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| 522 | |
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| 523 | id->refcount = 1; |
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| 524 | |
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| 525 | *ret = id; |
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| 526 | return ABAC_ID_SUCCESS; |
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| 527 | } |
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| 528 | |
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| 529 | /*****************************************************************/ |
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