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647 lines
21 KiB
C
647 lines
21 KiB
C
/*
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* Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* S/MIME utility function */
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#include <stdio.h>
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#include <string.h>
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#include "apps.h"
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#include "progs.h"
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#include <openssl/crypto.h>
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#include <openssl/x509_vfy.h>
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#include <openssl/x509v3.h>
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static int save_certs(char *signerfile, STACK_OF(X509) *signers);
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static int smime_cb(int ok, X509_STORE_CTX *ctx);
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#define SMIME_OP 0x10
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#define SMIME_IP 0x20
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#define SMIME_SIGNERS 0x40
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#define SMIME_ENCRYPT (1 | SMIME_OP)
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#define SMIME_DECRYPT (2 | SMIME_IP)
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#define SMIME_SIGN (3 | SMIME_OP | SMIME_SIGNERS)
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#define SMIME_VERIFY (4 | SMIME_IP)
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#define SMIME_PK7OUT (5 | SMIME_IP | SMIME_OP)
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#define SMIME_RESIGN (6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
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typedef enum OPTION_choice {
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OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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OPT_ENCRYPT, OPT_DECRYPT, OPT_SIGN, OPT_RESIGN, OPT_VERIFY,
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OPT_PK7OUT, OPT_TEXT, OPT_NOINTERN, OPT_NOVERIFY, OPT_NOCHAIN,
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OPT_NOCERTS, OPT_NOATTR, OPT_NODETACH, OPT_NOSMIMECAP,
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OPT_BINARY, OPT_NOSIGS, OPT_STREAM, OPT_INDEF, OPT_NOINDEF,
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OPT_CRLFEOL, OPT_ENGINE, OPT_PASSIN,
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OPT_TO, OPT_FROM, OPT_SUBJECT, OPT_SIGNER, OPT_RECIP, OPT_MD,
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OPT_CIPHER, OPT_INKEY, OPT_KEYFORM, OPT_CERTFILE, OPT_CAFILE,
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OPT_R_ENUM,
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OPT_V_ENUM,
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OPT_CAPATH, OPT_NOCAFILE, OPT_NOCAPATH, OPT_IN, OPT_INFORM, OPT_OUT,
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OPT_OUTFORM, OPT_CONTENT
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} OPTION_CHOICE;
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const OPTIONS smime_options[] = {
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{OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
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{OPT_HELP_STR, 1, '-',
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" cert.pem... recipient certs for encryption\n"},
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{OPT_HELP_STR, 1, '-', "Valid options are:\n"},
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{"help", OPT_HELP, '-', "Display this summary"},
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{"encrypt", OPT_ENCRYPT, '-', "Encrypt message"},
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{"decrypt", OPT_DECRYPT, '-', "Decrypt encrypted message"},
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{"sign", OPT_SIGN, '-', "Sign message"},
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{"verify", OPT_VERIFY, '-', "Verify signed message"},
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{"pk7out", OPT_PK7OUT, '-', "Output PKCS#7 structure"},
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{"nointern", OPT_NOINTERN, '-',
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"Don't search certificates in message for signer"},
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{"nosigs", OPT_NOSIGS, '-', "Don't verify message signature"},
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{"noverify", OPT_NOVERIFY, '-', "Don't verify signers certificate"},
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{"nocerts", OPT_NOCERTS, '-',
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"Don't include signers certificate when signing"},
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{"nodetach", OPT_NODETACH, '-', "Use opaque signing"},
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{"noattr", OPT_NOATTR, '-', "Don't include any signed attributes"},
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{"binary", OPT_BINARY, '-', "Don't translate message to text"},
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{"certfile", OPT_CERTFILE, '<', "Other certificates file"},
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{"signer", OPT_SIGNER, 's', "Signer certificate file"},
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{"recip", OPT_RECIP, '<', "Recipient certificate file for decryption"},
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{"in", OPT_IN, '<', "Input file"},
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{"inform", OPT_INFORM, 'c', "Input format SMIME (default), PEM or DER"},
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{"inkey", OPT_INKEY, 's',
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"Input private key (if not signer or recipient)"},
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{"keyform", OPT_KEYFORM, 'f', "Input private key format (PEM or ENGINE)"},
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{"out", OPT_OUT, '>', "Output file"},
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{"outform", OPT_OUTFORM, 'c',
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"Output format SMIME (default), PEM or DER"},
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{"content", OPT_CONTENT, '<',
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"Supply or override content for detached signature"},
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{"to", OPT_TO, 's', "To address"},
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{"from", OPT_FROM, 's', "From address"},
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{"subject", OPT_SUBJECT, 's', "Subject"},
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{"text", OPT_TEXT, '-', "Include or delete text MIME headers"},
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{"CApath", OPT_CAPATH, '/', "Trusted certificates directory"},
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{"CAfile", OPT_CAFILE, '<', "Trusted certificates file"},
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{"no-CAfile", OPT_NOCAFILE, '-',
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"Do not load the default certificates file"},
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{"no-CApath", OPT_NOCAPATH, '-',
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"Do not load certificates from the default certificates directory"},
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{"resign", OPT_RESIGN, '-', "Resign a signed message"},
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{"nochain", OPT_NOCHAIN, '-',
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"set PKCS7_NOCHAIN so certificates contained in the message are not used as untrusted CAs" },
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{"nosmimecap", OPT_NOSMIMECAP, '-', "Omit the SMIMECapabilities attribute"},
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{"stream", OPT_STREAM, '-', "Enable CMS streaming" },
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{"indef", OPT_INDEF, '-', "Same as -stream" },
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{"noindef", OPT_NOINDEF, '-', "Disable CMS streaming"},
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{"crlfeol", OPT_CRLFEOL, '-', "Use CRLF as EOL termination instead of CR only"},
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OPT_R_OPTIONS,
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{"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
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{"md", OPT_MD, 's', "Digest algorithm to use when signing or resigning"},
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{"", OPT_CIPHER, '-', "Any supported cipher"},
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OPT_V_OPTIONS,
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#ifndef OPENSSL_NO_ENGINE
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{"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
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#endif
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{NULL}
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};
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int smime_main(int argc, char **argv)
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{
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BIO *in = NULL, *out = NULL, *indata = NULL;
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EVP_PKEY *key = NULL;
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PKCS7 *p7 = NULL;
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STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
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STACK_OF(X509) *encerts = NULL, *other = NULL;
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X509 *cert = NULL, *recip = NULL, *signer = NULL;
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X509_STORE *store = NULL;
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X509_VERIFY_PARAM *vpm = NULL;
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const EVP_CIPHER *cipher = NULL;
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const EVP_MD *sign_md = NULL;
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const char *CAfile = NULL, *CApath = NULL, *prog = NULL;
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char *certfile = NULL, *keyfile = NULL, *contfile = NULL;
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char *infile = NULL, *outfile = NULL, *signerfile = NULL, *recipfile = NULL;
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char *passinarg = NULL, *passin = NULL, *to = NULL, *from = NULL, *subject = NULL;
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OPTION_CHOICE o;
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int noCApath = 0, noCAfile = 0;
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int flags = PKCS7_DETACHED, operation = 0, ret = 0, indef = 0;
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int informat = FORMAT_SMIME, outformat = FORMAT_SMIME, keyform =
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FORMAT_PEM;
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int vpmtouched = 0, rv = 0;
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ENGINE *e = NULL;
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const char *mime_eol = "\n";
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if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
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return 1;
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prog = opt_init(argc, argv, smime_options);
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while ((o = opt_next()) != OPT_EOF) {
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switch (o) {
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case OPT_EOF:
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case OPT_ERR:
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opthelp:
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BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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goto end;
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case OPT_HELP:
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opt_help(smime_options);
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ret = 0;
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goto end;
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case OPT_INFORM:
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if (!opt_format(opt_arg(), OPT_FMT_PDS, &informat))
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goto opthelp;
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break;
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case OPT_IN:
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infile = opt_arg();
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break;
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case OPT_OUTFORM:
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if (!opt_format(opt_arg(), OPT_FMT_PDS, &outformat))
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goto opthelp;
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break;
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case OPT_OUT:
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outfile = opt_arg();
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break;
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case OPT_ENCRYPT:
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operation = SMIME_ENCRYPT;
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break;
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case OPT_DECRYPT:
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operation = SMIME_DECRYPT;
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break;
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case OPT_SIGN:
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operation = SMIME_SIGN;
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break;
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case OPT_RESIGN:
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operation = SMIME_RESIGN;
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break;
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case OPT_VERIFY:
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operation = SMIME_VERIFY;
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break;
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case OPT_PK7OUT:
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operation = SMIME_PK7OUT;
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break;
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case OPT_TEXT:
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flags |= PKCS7_TEXT;
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break;
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case OPT_NOINTERN:
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flags |= PKCS7_NOINTERN;
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break;
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case OPT_NOVERIFY:
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flags |= PKCS7_NOVERIFY;
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break;
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case OPT_NOCHAIN:
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flags |= PKCS7_NOCHAIN;
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break;
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case OPT_NOCERTS:
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flags |= PKCS7_NOCERTS;
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break;
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case OPT_NOATTR:
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flags |= PKCS7_NOATTR;
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break;
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case OPT_NODETACH:
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flags &= ~PKCS7_DETACHED;
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break;
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case OPT_NOSMIMECAP:
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flags |= PKCS7_NOSMIMECAP;
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break;
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case OPT_BINARY:
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flags |= PKCS7_BINARY;
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break;
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case OPT_NOSIGS:
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flags |= PKCS7_NOSIGS;
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break;
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case OPT_STREAM:
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case OPT_INDEF:
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indef = 1;
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break;
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case OPT_NOINDEF:
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indef = 0;
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break;
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case OPT_CRLFEOL:
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flags |= PKCS7_CRLFEOL;
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mime_eol = "\r\n";
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break;
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case OPT_R_CASES:
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if (!opt_rand(o))
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goto end;
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break;
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case OPT_ENGINE:
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e = setup_engine(opt_arg(), 0);
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break;
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case OPT_PASSIN:
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passinarg = opt_arg();
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break;
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case OPT_TO:
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to = opt_arg();
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break;
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case OPT_FROM:
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from = opt_arg();
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break;
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case OPT_SUBJECT:
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subject = opt_arg();
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break;
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case OPT_SIGNER:
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/* If previous -signer argument add signer to list */
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if (signerfile != NULL) {
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if (sksigners == NULL
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&& (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
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goto end;
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sk_OPENSSL_STRING_push(sksigners, signerfile);
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if (keyfile == NULL)
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keyfile = signerfile;
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if (skkeys == NULL
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&& (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
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goto end;
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sk_OPENSSL_STRING_push(skkeys, keyfile);
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keyfile = NULL;
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}
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signerfile = opt_arg();
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break;
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case OPT_RECIP:
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recipfile = opt_arg();
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break;
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case OPT_MD:
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if (!opt_md(opt_arg(), &sign_md))
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goto opthelp;
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break;
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case OPT_CIPHER:
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if (!opt_cipher(opt_unknown(), &cipher))
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goto opthelp;
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break;
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case OPT_INKEY:
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/* If previous -inkey argument add signer to list */
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if (keyfile != NULL) {
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if (signerfile == NULL) {
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BIO_printf(bio_err,
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"%s: Must have -signer before -inkey\n", prog);
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goto opthelp;
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}
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if (sksigners == NULL
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&& (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
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goto end;
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sk_OPENSSL_STRING_push(sksigners, signerfile);
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signerfile = NULL;
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if (skkeys == NULL
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&& (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
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goto end;
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sk_OPENSSL_STRING_push(skkeys, keyfile);
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}
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keyfile = opt_arg();
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break;
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case OPT_KEYFORM:
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if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
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goto opthelp;
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break;
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case OPT_CERTFILE:
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certfile = opt_arg();
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break;
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case OPT_CAFILE:
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CAfile = opt_arg();
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break;
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case OPT_CAPATH:
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CApath = opt_arg();
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break;
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case OPT_NOCAFILE:
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noCAfile = 1;
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break;
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case OPT_NOCAPATH:
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noCApath = 1;
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break;
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case OPT_CONTENT:
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contfile = opt_arg();
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break;
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case OPT_V_CASES:
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if (!opt_verify(o, vpm))
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goto opthelp;
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vpmtouched++;
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break;
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}
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}
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argc = opt_num_rest();
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argv = opt_rest();
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if (!(operation & SMIME_SIGNERS) && (skkeys != NULL || sksigners != NULL)) {
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BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
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goto opthelp;
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}
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if (operation & SMIME_SIGNERS) {
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/* Check to see if any final signer needs to be appended */
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if (keyfile && !signerfile) {
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BIO_puts(bio_err, "Illegal -inkey without -signer\n");
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goto opthelp;
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}
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if (signerfile != NULL) {
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if (sksigners == NULL
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&& (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
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goto end;
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sk_OPENSSL_STRING_push(sksigners, signerfile);
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if (!skkeys && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
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goto end;
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if (!keyfile)
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keyfile = signerfile;
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sk_OPENSSL_STRING_push(skkeys, keyfile);
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}
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if (sksigners == NULL) {
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BIO_printf(bio_err, "No signer certificate specified\n");
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goto opthelp;
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}
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signerfile = NULL;
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keyfile = NULL;
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} else if (operation == SMIME_DECRYPT) {
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if (recipfile == NULL && keyfile == NULL) {
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BIO_printf(bio_err,
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"No recipient certificate or key specified\n");
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goto opthelp;
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}
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} else if (operation == SMIME_ENCRYPT) {
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if (argc == 0) {
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BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
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goto opthelp;
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}
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} else if (!operation) {
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goto opthelp;
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}
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if (!app_passwd(passinarg, NULL, &passin, NULL)) {
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BIO_printf(bio_err, "Error getting password\n");
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goto end;
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}
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ret = 2;
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if (!(operation & SMIME_SIGNERS))
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flags &= ~PKCS7_DETACHED;
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if (!(operation & SMIME_OP)) {
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if (flags & PKCS7_BINARY)
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outformat = FORMAT_BINARY;
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}
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if (!(operation & SMIME_IP)) {
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if (flags & PKCS7_BINARY)
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informat = FORMAT_BINARY;
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}
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if (operation == SMIME_ENCRYPT) {
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if (cipher == NULL) {
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#ifndef OPENSSL_NO_DES
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cipher = EVP_des_ede3_cbc();
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#else
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BIO_printf(bio_err, "No cipher selected\n");
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goto end;
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#endif
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}
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encerts = sk_X509_new_null();
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if (encerts == NULL)
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goto end;
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while (*argv != NULL) {
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cert = load_cert(*argv, FORMAT_PEM,
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"recipient certificate file");
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if (cert == NULL)
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goto end;
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sk_X509_push(encerts, cert);
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cert = NULL;
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argv++;
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}
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}
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if (certfile != NULL) {
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if (!load_certs(certfile, &other, FORMAT_PEM, NULL,
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"certificate file")) {
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ERR_print_errors(bio_err);
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goto end;
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}
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}
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if (recipfile != NULL && (operation == SMIME_DECRYPT)) {
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if ((recip = load_cert(recipfile, FORMAT_PEM,
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"recipient certificate file")) == NULL) {
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ERR_print_errors(bio_err);
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goto end;
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}
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}
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if (operation == SMIME_DECRYPT) {
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if (keyfile == NULL)
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keyfile = recipfile;
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} else if (operation == SMIME_SIGN) {
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if (keyfile == NULL)
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keyfile = signerfile;
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} else {
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keyfile = NULL;
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}
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if (keyfile != NULL) {
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key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
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if (key == NULL)
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goto end;
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}
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in = bio_open_default(infile, 'r', informat);
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if (in == NULL)
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goto end;
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if (operation & SMIME_IP) {
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if (informat == FORMAT_SMIME) {
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p7 = SMIME_read_PKCS7(in, &indata);
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} else if (informat == FORMAT_PEM) {
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p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
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} else if (informat == FORMAT_ASN1) {
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p7 = d2i_PKCS7_bio(in, NULL);
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} else {
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BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
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goto end;
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}
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if (p7 == NULL) {
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BIO_printf(bio_err, "Error reading S/MIME message\n");
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goto end;
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}
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if (contfile != NULL) {
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BIO_free(indata);
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if ((indata = BIO_new_file(contfile, "rb")) == NULL) {
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BIO_printf(bio_err, "Can't read content file %s\n", contfile);
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goto end;
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}
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}
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}
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out = bio_open_default(outfile, 'w', outformat);
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if (out == NULL)
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goto end;
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if (operation == SMIME_VERIFY) {
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if ((store = setup_verify(CAfile, CApath, noCAfile, noCApath)) == NULL)
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goto end;
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X509_STORE_set_verify_cb(store, smime_cb);
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if (vpmtouched)
|
|
X509_STORE_set1_param(store, vpm);
|
|
}
|
|
|
|
ret = 3;
|
|
|
|
if (operation == SMIME_ENCRYPT) {
|
|
if (indef)
|
|
flags |= PKCS7_STREAM;
|
|
p7 = PKCS7_encrypt(encerts, in, cipher, flags);
|
|
} else if (operation & SMIME_SIGNERS) {
|
|
int i;
|
|
/*
|
|
* If detached data content we only enable streaming if S/MIME output
|
|
* format.
|
|
*/
|
|
if (operation == SMIME_SIGN) {
|
|
if (flags & PKCS7_DETACHED) {
|
|
if (outformat == FORMAT_SMIME)
|
|
flags |= PKCS7_STREAM;
|
|
} else if (indef) {
|
|
flags |= PKCS7_STREAM;
|
|
}
|
|
flags |= PKCS7_PARTIAL;
|
|
p7 = PKCS7_sign(NULL, NULL, other, in, flags);
|
|
if (p7 == NULL)
|
|
goto end;
|
|
if (flags & PKCS7_NOCERTS) {
|
|
for (i = 0; i < sk_X509_num(other); i++) {
|
|
X509 *x = sk_X509_value(other, i);
|
|
PKCS7_add_certificate(p7, x);
|
|
}
|
|
}
|
|
} else {
|
|
flags |= PKCS7_REUSE_DIGEST;
|
|
}
|
|
for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
|
|
signerfile = sk_OPENSSL_STRING_value(sksigners, i);
|
|
keyfile = sk_OPENSSL_STRING_value(skkeys, i);
|
|
signer = load_cert(signerfile, FORMAT_PEM,
|
|
"signer certificate");
|
|
if (signer == NULL)
|
|
goto end;
|
|
key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
|
|
if (key == NULL)
|
|
goto end;
|
|
if (!PKCS7_sign_add_signer(p7, signer, key, sign_md, flags))
|
|
goto end;
|
|
X509_free(signer);
|
|
signer = NULL;
|
|
EVP_PKEY_free(key);
|
|
key = NULL;
|
|
}
|
|
/* If not streaming or resigning finalize structure */
|
|
if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM)) {
|
|
if (!PKCS7_final(p7, in, flags))
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
if (p7 == NULL) {
|
|
BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
|
|
goto end;
|
|
}
|
|
|
|
ret = 4;
|
|
if (operation == SMIME_DECRYPT) {
|
|
if (!PKCS7_decrypt(p7, key, recip, out, flags)) {
|
|
BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
|
|
goto end;
|
|
}
|
|
} else if (operation == SMIME_VERIFY) {
|
|
STACK_OF(X509) *signers;
|
|
if (PKCS7_verify(p7, other, store, indata, out, flags))
|
|
BIO_printf(bio_err, "Verification successful\n");
|
|
else {
|
|
BIO_printf(bio_err, "Verification failure\n");
|
|
goto end;
|
|
}
|
|
signers = PKCS7_get0_signers(p7, other, flags);
|
|
if (!save_certs(signerfile, signers)) {
|
|
BIO_printf(bio_err, "Error writing signers to %s\n", signerfile);
|
|
ret = 5;
|
|
goto end;
|
|
}
|
|
sk_X509_free(signers);
|
|
} else if (operation == SMIME_PK7OUT) {
|
|
PEM_write_bio_PKCS7(out, p7);
|
|
} else {
|
|
if (to)
|
|
BIO_printf(out, "To: %s%s", to, mime_eol);
|
|
if (from)
|
|
BIO_printf(out, "From: %s%s", from, mime_eol);
|
|
if (subject)
|
|
BIO_printf(out, "Subject: %s%s", subject, mime_eol);
|
|
if (outformat == FORMAT_SMIME) {
|
|
if (operation == SMIME_RESIGN)
|
|
rv = SMIME_write_PKCS7(out, p7, indata, flags);
|
|
else
|
|
rv = SMIME_write_PKCS7(out, p7, in, flags);
|
|
} else if (outformat == FORMAT_PEM) {
|
|
rv = PEM_write_bio_PKCS7_stream(out, p7, in, flags);
|
|
} else if (outformat == FORMAT_ASN1) {
|
|
rv = i2d_PKCS7_bio_stream(out, p7, in, flags);
|
|
} else {
|
|
BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
|
|
goto end;
|
|
}
|
|
if (rv == 0) {
|
|
BIO_printf(bio_err, "Error writing output\n");
|
|
ret = 3;
|
|
goto end;
|
|
}
|
|
}
|
|
ret = 0;
|
|
end:
|
|
if (ret)
|
|
ERR_print_errors(bio_err);
|
|
sk_X509_pop_free(encerts, X509_free);
|
|
sk_X509_pop_free(other, X509_free);
|
|
X509_VERIFY_PARAM_free(vpm);
|
|
sk_OPENSSL_STRING_free(sksigners);
|
|
sk_OPENSSL_STRING_free(skkeys);
|
|
X509_STORE_free(store);
|
|
X509_free(cert);
|
|
X509_free(recip);
|
|
X509_free(signer);
|
|
EVP_PKEY_free(key);
|
|
PKCS7_free(p7);
|
|
release_engine(e);
|
|
BIO_free(in);
|
|
BIO_free(indata);
|
|
BIO_free_all(out);
|
|
OPENSSL_free(passin);
|
|
return ret;
|
|
}
|
|
|
|
static int save_certs(char *signerfile, STACK_OF(X509) *signers)
|
|
{
|
|
int i;
|
|
BIO *tmp;
|
|
|
|
if (signerfile == NULL)
|
|
return 1;
|
|
tmp = BIO_new_file(signerfile, "w");
|
|
if (tmp == NULL)
|
|
return 0;
|
|
for (i = 0; i < sk_X509_num(signers); i++)
|
|
PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
|
|
BIO_free(tmp);
|
|
return 1;
|
|
}
|
|
|
|
/* Minimal callback just to output policy info (if any) */
|
|
|
|
static int smime_cb(int ok, X509_STORE_CTX *ctx)
|
|
{
|
|
int error;
|
|
|
|
error = X509_STORE_CTX_get_error(ctx);
|
|
|
|
if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
|
|
&& ((error != X509_V_OK) || (ok != 2)))
|
|
return ok;
|
|
|
|
policies_print(ctx);
|
|
|
|
return ok;
|
|
}
|