6e085fd13f
EVP_sha1() returns a const EVP_MD *, so reflect that in the variable we store its return value in.
428 lines
9.0 KiB
C
428 lines
9.0 KiB
C
/*-
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* Copyright (c) 2000 Softweyr LLC, South Jordan, Utah, USA.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY Softweyr LLC ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL Softweyr LLC BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libgen.h>
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#include <openssl/rsa.h>
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#include <openssl/evp.h>
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include <openssl/err.h>
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#include <openssl/pem.h>
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#include <openssl/ssl.h>
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#include "stand.h"
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#include "gzip.h"
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#include "extern.h"
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/*
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* Default names for the signing key and certificate(s) for verification.
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*/
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#define CERTFILE "/etc/ssl/pkg.crt"
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#define KEYFILE "/etc/ssl/pkg.key"
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/*
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* Private context for X.509 signature checker
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*/
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struct x509_checker
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{
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const char * id;
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const char * filename;
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struct signature * signature;
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STACK_OF(X509) * certs;
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EVP_MD_CTX rsa_ctx, dsa_ctx;
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int has_rsa, has_dsa;
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};
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static void key_from_name(char *, const char *);
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/*
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* Initialize an X.509 "checker" context.
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*/
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void *
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new_x509_checker(h, sign, userid, envp, filename)
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struct mygzip_header *h;
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struct signature *sign;
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const char *userid;
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char *envp[];
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/*@observer@*/const char *filename;
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{
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FILE * fp;
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struct x509_checker * me;
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char certfile[PATH_MAX + 1] = CERTFILE;
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char * cp;
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X509 * x509;
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assert(sign->type == TAG_X509);
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/*
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* Make sure data conforms to what we can handle. We do not write a
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* trailing null onto the signature like some other types, because
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* the X.509 signature is binary data.
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*/
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if (sign->length > MAXID) {
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warnx("Corrupted X.509 header in %s", filename);
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return 0;
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}
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me = malloc(sizeof *me);
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if (me == NULL) {
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warn("Cannot allocate x509_checker");
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return 0;
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}
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me->id = sign->data;
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me->filename = filename;
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me->signature = sign;
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me->has_rsa = 0;
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me->has_dsa = 0;
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key_from_name(certfile, userkey);
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/*
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* Load just the crypto library error strings.
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*/
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ERR_load_crypto_strings();
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/*
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* Load the stack of X.509 certs we will compare against.
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*
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* KLUDGE: this needs to be fleshed out a bit. We can do better
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* than hard-coding the location of the cert key file.
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*/
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me->certs = sk_X509_new_null();
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fp = fopen(certfile, "r");
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if (fp == NULL) {
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warnx("Cannot open public key %s", certfile);
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return 0;
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}
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if (verbose)
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printf("Loading certificates from %s:\n", certfile);
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while (x509 = PEM_read_X509(fp, NULL, NULL, 0)) {
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sk_X509_push(me->certs, x509);
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switch (EVP_PKEY_type(X509_get_pubkey(x509)->type))
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{
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case EVP_PKEY_RSA:
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me->has_rsa = 1;
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break;
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case EVP_PKEY_DSA:
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me->has_dsa = 1;
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break;
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default:
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warnx("Uknown certificate type");
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return 0;
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}
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/*
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* By default, print the contents of the cert we matched so the
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* user can decide if she is willing to accept a package from
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* whoever signed this.
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*/
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if (!quiet)
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X509_print_fp(stdout, x509);
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}
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fclose(fp);
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/*
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* Initialize the verification contexts for both RSA and DSA.
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*/
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if (me->has_rsa) EVP_VerifyInit(&me->rsa_ctx, EVP_sha1());
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if (me->has_dsa) EVP_VerifyInit(&me->dsa_ctx, EVP_dss1());
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return me;
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}
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/*
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* "Add" another data block to an existing checker.
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*/
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void
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x509_add(arg, buffer, length)
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void *arg;
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const char *buffer;
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size_t length;
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{
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struct x509_checker * me = arg;
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if (me->has_rsa) EVP_VerifyUpdate(&me->rsa_ctx, buffer, length);
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if (me->has_dsa) EVP_VerifyUpdate(&me->dsa_ctx, buffer, length);
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}
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/*
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* Finalize an existing checker and verify the signature matches one of the
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* certs in our stack.
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*/
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int
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x509_sign_ok(arg)
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void *arg;
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{
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struct x509_checker * n = arg;
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X509 * x509;
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EVP_PKEY * pkey;
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EVP_MD_CTX * md_ctx;
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int status;
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if (verbose)
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printf("\n\n-------\n\nChecking package signature:\n");
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while ((x509 = sk_X509_pop(n->certs)) != NULL) {
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/*
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* Get public key from cert.
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*/
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pkey = X509_get_pubkey(x509);
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if (pkey == NULL) {
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warnx("Getting public key:");
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ERR_print_errors_fp(stderr);
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continue;
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}
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if (verbose)
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X509_print_fp(stdout, x509);
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switch (EVP_PKEY_type(pkey->type))
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{
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case EVP_PKEY_RSA:
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md_ctx = &n->rsa_ctx;
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break;
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case EVP_PKEY_DSA:
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md_ctx = &n->dsa_ctx;
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break;
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default:
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break;
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}
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status = EVP_VerifyFinal(md_ctx,
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n->signature->data,
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n->signature->length,
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pkey);
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EVP_PKEY_free(pkey);
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X509_free(x509);
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if (status == 1) {
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fprintf(stderr, "X.509 signature matched\n");
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/*
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* KLUDGE: Does this free the rest of the certs, or just the
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* stack itself? Enquiring minds want to know.
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*/
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sk_X509_free(n->certs);
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return PKG_GOODSIG;
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}
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}
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warnx("Verifying signature:");
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ERR_print_errors_fp(stderr);
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sk_X509_free(n->certs);
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return PKG_BADSIG;
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}
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/*
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* Sign the specified filename into sign.
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*/
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int
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retrieve_x509_marker(filename, sign, userid)
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const char * filename;
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struct signature ** sign;
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const char * userid;
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{
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struct signature * n;
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struct mygzip_header h;
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FILE * f, * keyf;
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char buffer[1024];
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ssize_t length;
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int err;
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int sig_len = 4096;
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unsigned char * sig_buf;
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EVP_MD_CTX md_ctx;
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const EVP_MD * md_type;
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EVP_PKEY * pkey;
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char keyfile[PATH_MAX + 1] = KEYFILE;
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char * kp;
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key_from_name(keyfile, userkey);
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f = fopen(filename, "r");
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if (f == NULL) {
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free(n);
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return 0;
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}
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if (gzip_read_header(f, &h, sign) == GZIP_NOT_GZIP) {
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warnx("File %s is not a gzip file\n", filename);
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fclose(f);
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free(n);
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return 0;
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}
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/*
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* Sign the remaining data:
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* Load just the crypto library error strings.
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*/
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ERR_load_crypto_strings();
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/*
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* Read private key.
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*/
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keyf = fopen(keyfile, "r");
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if (keyf == NULL)
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{
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warnx("Cannot open private key %s.", keyfile);
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return 0;
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}
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pkey = PEM_read_PrivateKey(keyf, NULL, NULL, 0);
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fclose(keyf);
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if (pkey == NULL)
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{
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warnx("Reading private key %s:", keyfile);
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ERR_print_errors_fp(stderr);
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return 0;
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}
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/*
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* Do the signature. The remaining bytes of the GZIP file are the
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* compressed tar image, which is what we are signing.
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*/
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switch (EVP_PKEY_type(pkey->type))
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{
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case EVP_PKEY_RSA:
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md_type = EVP_sha1();
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printf("*** It's an RSA key.\n");
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break;
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case EVP_PKEY_DSA:
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md_type = EVP_dss1();
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printf("@@@ It's a DSA key, yippee!\n");
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break;
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default:
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warnx("Uknown key type");
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return 0;
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}
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EVP_SignInit(&md_ctx, md_type);
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while ((length = fread(buffer, 1, sizeof buffer, f)) > 0)
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EVP_SignUpdate(&md_ctx, buffer, length);
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sig_buf = malloc(sig_len);
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if (sig_buf == NULL) {
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warnx("Cannot allocated %u bytes for signature buffer", sig_len);
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return 0;
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}
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err = EVP_SignFinal(&md_ctx, sig_buf, &sig_len, pkey);
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if (err != 1)
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{
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warnx("Creating signature:");
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ERR_print_errors_fp(stderr);
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return 0;
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}
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EVP_PKEY_free(pkey);
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/*
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* Stuff the signature onto the head of the chain of signatures in
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* the package.
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*/
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n = malloc(sizeof *n);
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if (n == NULL) {
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warnx("Cannot allocate %u bytes for new signature", sizeof *n);
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return 0;
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}
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n->data = sig_buf;
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n->length = sig_len;
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n->type = TAG_X509;
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memcpy(n->tag, x509tag, sizeof x509tag);
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sign_fill_tag(n);
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n->next = *sign;
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*sign = n;
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/*
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* Report our success.
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*/
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return 1;
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}
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static void
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key_from_name(char * filename, const char * ident)
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{
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char * cp;
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/*
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* If an alternate keyfile was specified, treat it as the name of an
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* alternate private key with which to sign or verify the package.
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*/
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if (ident) {
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printf("Using alternate key/cert \"%s\".\n", ident);
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if (strchr(ident, '/')) {
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/*
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* The user specified a path, take it verbatim.
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*/
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strncpy(filename, ident, PATH_MAX);
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} else {
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cp = dirname(filename);
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if (cp == NULL) {
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warnx("Key directory not correctly specified.");
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return;
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}
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snprintf(filename, PATH_MAX, "%s/%s", cp, ident);
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}
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}
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if (verbose)
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printf("Key is \"%s\".\n", filename);
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}
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