| 1 | /*
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| 2 | * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /* Simple S/MIME verification example */
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| 11 | #include <openssl/pem.h>
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| 12 | #include <openssl/cms.h>
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| 13 | #include <openssl/err.h>
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| 14 |
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| 15 | /*
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| 16 | * print any signingTime attributes.
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| 17 | * signingTime is when each party purportedly signed the message.
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| 18 | */
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| 19 | static void print_signingTime(CMS_ContentInfo *cms)
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| 20 | {
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| 21 | STACK_OF(CMS_SignerInfo) *sis;
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| 22 | CMS_SignerInfo *si;
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| 23 | X509_ATTRIBUTE *attr;
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| 24 | ASN1_TYPE *t;
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| 25 | ASN1_UTCTIME *utctime;
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| 26 | ASN1_GENERALIZEDTIME *gtime;
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| 27 | BIO *b;
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| 28 | int i, loc;
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| 29 |
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| 30 | b = BIO_new_fp(stdout, BIO_NOCLOSE | BIO_FP_TEXT);
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| 31 | sis = CMS_get0_SignerInfos(cms);
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| 32 | for (i = 0; i < sk_CMS_SignerInfo_num(sis); i++) {
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| 33 | si = sk_CMS_SignerInfo_value(sis, i);
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| 34 | loc = CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1);
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| 35 | attr = CMS_signed_get_attr(si, loc);
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| 36 | t = X509_ATTRIBUTE_get0_type(attr, 0);
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| 37 | if (t == NULL)
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| 38 | continue;
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| 39 | switch (t->type) {
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| 40 | case V_ASN1_UTCTIME:
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| 41 | utctime = t->value.utctime;
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| 42 | ASN1_UTCTIME_print(b, utctime);
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| 43 | break;
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| 44 | case V_ASN1_GENERALIZEDTIME:
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| 45 | gtime = t->value.generalizedtime;
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| 46 | ASN1_GENERALIZEDTIME_print(b, gtime);
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| 47 | break;
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| 48 | default:
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| 49 | fprintf(stderr, "unrecognized signingTime type\n");
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| 50 | break;
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| 51 | }
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| 52 | BIO_printf(b, ": signingTime from SignerInfo %i\n", i);
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| 53 | }
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| 54 | BIO_free(b);
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| 55 | return;
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| 56 | }
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| 57 |
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| 58 | int main(int argc, char **argv)
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| 59 | {
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| 60 | BIO *in = NULL, *out = NULL, *tbio = NULL, *cont = NULL;
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| 61 | X509_STORE *st = NULL;
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| 62 | X509 *cacert = NULL;
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| 63 | CMS_ContentInfo *cms = NULL;
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| 64 | int ret = EXIT_FAILURE;
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| 65 |
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| 66 | OpenSSL_add_all_algorithms();
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| 67 | ERR_load_crypto_strings();
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| 68 |
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| 69 | /* Set up trusted CA certificate store */
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| 70 |
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| 71 | st = X509_STORE_new();
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| 72 | if (st == NULL)
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| 73 | goto err;
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| 74 |
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| 75 | /* Read in CA certificate */
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| 76 | tbio = BIO_new_file("cacert.pem", "r");
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| 77 |
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| 78 | if (tbio == NULL)
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| 79 | goto err;
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| 80 |
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| 81 | cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
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| 82 |
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| 83 | if (cacert == NULL)
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| 84 | goto err;
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| 85 |
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| 86 | if (!X509_STORE_add_cert(st, cacert))
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| 87 | goto err;
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| 88 |
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| 89 | /* Open message being verified */
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| 90 |
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| 91 | in = BIO_new_file("smout.txt", "r");
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| 92 |
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| 93 | if (in == NULL)
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| 94 | goto err;
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| 95 |
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| 96 | /* parse message */
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| 97 | cms = SMIME_read_CMS(in, &cont);
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| 98 |
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| 99 | if (cms == NULL)
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| 100 | goto err;
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| 101 |
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| 102 | print_signingTime(cms);
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| 103 |
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| 104 | /* File to output verified content to */
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| 105 | out = BIO_new_file("smver.txt", "w");
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| 106 | if (out == NULL)
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| 107 | goto err;
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| 108 |
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| 109 | if (!CMS_verify(cms, NULL, st, cont, out, 0)) {
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| 110 | fprintf(stderr, "Verification Failure\n");
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| 111 | goto err;
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| 112 | }
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| 113 |
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| 114 | printf("Verification Successful\n");
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| 115 |
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| 116 | ret = EXIT_SUCCESS;
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| 117 |
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| 118 | err:
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| 119 | if (ret != EXIT_SUCCESS) {
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| 120 | fprintf(stderr, "Error Verifying Data\n");
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| 121 | ERR_print_errors_fp(stderr);
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| 122 | }
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| 123 |
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| 124 | X509_STORE_free(st);
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| 125 | CMS_ContentInfo_free(cms);
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| 126 | X509_free(cacert);
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| 127 | BIO_free(in);
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| 128 | BIO_free(out);
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| 129 | BIO_free(tbio);
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| 130 | return ret;
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| 131 | }
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