/* * Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved. * Copyright (c) 2013-2014 Timo Teräs <timo.teras@gmail.com> * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include "apps.h" #if defined(OPENSSL_SYS_UNIX) || defined(__APPLE__) || \ (defined(__VMS) && defined(__DECC) && __CRTL_VER >= 80300000) # include <unistd.h> # include <stdio.h> # include <limits.h> # include <errno.h> # include <string.h> # include <ctype.h> # include <sys/stat.h> /* * Make sure that the processing of symbol names is treated the same as when * libcrypto is built. This is done automatically for public headers (see * include/openssl/__DECC_INCLUDE_PROLOGUE.H and __DECC_INCLUDE_EPILOGUE.H), * but not for internal headers. */ # ifdef __VMS # pragma names save # pragma names as_is,shortened # endif # include "internal/o_dir.h" # ifdef __VMS # pragma names restore # endif # include <openssl/evp.h> # include <openssl/pem.h> # include <openssl/x509.h> # ifndef PATH_MAX # define PATH_MAX 4096 # endif # ifndef NAME_MAX # define NAME_MAX 255 # endif # define MAX_COLLISIONS 256 typedef struct hentry_st { struct hentry_st *next; char *filename; unsigned short old_id; unsigned char need_symlink; unsigned char digest[EVP_MAX_MD_SIZE]; } HENTRY; typedef struct bucket_st { struct bucket_st *next; HENTRY *first_entry, *last_entry; unsigned int hash; unsigned short type; unsigned short num_needed; } BUCKET; enum Type { /* Keep in sync with |suffixes|, below. */ TYPE_CERT=0, TYPE_CRL=1 }; enum Hash { HASH_OLD, HASH_NEW, HASH_BOTH }; static int evpmdsize; static const EVP_MD *evpmd; static int remove_links = 1; static int verbose = 0; static BUCKET *hash_table[257]; static const char *suffixes[] = { "", "r" }; static const char *extensions[] = { "pem", "crt", "cer", "crl" }; static void bit_set(unsigned char *set, unsigned int bit) { set[bit >> 3] |= 1 << (bit & 0x7); } static int bit_isset(unsigned char *set, unsigned int bit) { return set[bit >> 3] & (1 << (bit & 0x7)); } /* * Process an entry; return number of errors. */ static int add_entry(enum Type type, unsigned int hash, const char *filename, const unsigned char *digest, int need_symlink, unsigned short old_id) { static BUCKET nilbucket; static HENTRY nilhentry; BUCKET *bp; HENTRY *ep, *found = NULL; unsigned int ndx = (type + hash) % OSSL_NELEM(hash_table); for (bp = hash_table[ndx]; bp; bp = bp->next) if (bp->type == type && bp->hash == hash) break; if (bp == NULL) { bp = app_malloc(sizeof(*bp), "hash bucket"); *bp = nilbucket; bp->next = hash_table[ndx]; bp->type = type; bp->hash = hash; hash_table[ndx] = bp; } for (ep = bp->first_entry; ep; ep = ep->next) { if (digest && memcmp(digest, ep->digest, evpmdsize) == 0) { BIO_printf(bio_err, "%s: skipping duplicate %s in %s\n", opt_getprog(), type == TYPE_CERT ? "certificate" : "CRL", filename); return 1; } if (strcmp(filename, ep->filename) == 0) { found = ep; if (digest == NULL) break; } } ep = found; if (ep == NULL) { if (bp->num_needed >= MAX_COLLISIONS) { BIO_printf(bio_err, "%s: hash table overflow for %s\n", opt_getprog(), filename); return 1; } ep = app_malloc(sizeof(*ep), "collision bucket"); *ep = nilhentry; ep->old_id = ~0; ep->filename = OPENSSL_strdup(filename); if (bp->last_entry) bp->last_entry->next = ep; if (bp->first_entry == NULL) bp->first_entry = ep; bp->last_entry = ep; } if (old_id < ep->old_id) ep->old_id = old_id; if (need_symlink && !ep->need_symlink) { ep->need_symlink = 1; bp->num_needed++; memcpy(ep->digest, digest, evpmdsize); } return 0; } /* * Check if a symlink goes to the right spot; return 0 if okay. * This can be -1 if bad filename, or an error count. */ static int handle_symlink(const char *filename, const char *fullpath) { unsigned int hash = 0; int i, type, id; unsigned char ch; char linktarget[PATH_MAX], *endptr; ossl_ssize_t n; for (i = 0; i < 8; i++) { ch = filename[i]; if (!isxdigit(ch)) return -1; hash <<= 4; hash += OPENSSL_hexchar2int(ch); } if (filename[i++] != '.') return -1; for (type = OSSL_NELEM(suffixes) - 1; type > 0; type--) { const char *suffix = suffixes[type]; if (strncasecmp(suffix, &filename[i], strlen(suffix)) == 0) break; } i += strlen(suffixes[type]); id = strtoul(&filename[i], &endptr, 10); if (*endptr != '\0') return -1; n = readlink(fullpath, linktarget, sizeof(linktarget)); if (n < 0 || n >= (int)sizeof(linktarget)) return -1; linktarget[n] = 0; return add_entry(type, hash, linktarget, NULL, 0, id); } /* * process a file, return number of errors. */ static int do_file(const char *filename, const char *fullpath, enum Hash h) { STACK_OF (X509_INFO) *inf = NULL; X509_INFO *x; X509_NAME *name = NULL; BIO *b; const char *ext; unsigned char digest[EVP_MAX_MD_SIZE]; int type, errs = 0; size_t i; /* Does it end with a recognized extension? */ if ((ext = strrchr(filename, '.')) == NULL) goto end; for (i = 0; i < OSSL_NELEM(extensions); i++) { if (strcasecmp(extensions[i], ext + 1) == 0) break; } if (i >= OSSL_NELEM(extensions)) goto end; /* Does it have X.509 data in it? */ if ((b = BIO_new_file(fullpath, "r")) == NULL) { BIO_printf(bio_err, "%s: skipping %s, cannot open file\n", opt_getprog(), filename); errs++; goto end; } inf = PEM_X509_INFO_read_bio(b, NULL, NULL, NULL); BIO_free(b); if (inf == NULL) goto end; if (sk_X509_INFO_num(inf) != 1) { BIO_printf(bio_err, "%s: skipping %s," "it does not contain exactly one certificate or CRL\n", opt_getprog(), filename); /* This is not an error. */ goto end; } x = sk_X509_INFO_value(inf, 0); if (x->x509 != NULL) { type = TYPE_CERT; name = X509_get_subject_name(x->x509); X509_digest(x->x509, evpmd, digest, NULL); } else if (x->crl != NULL) { type = TYPE_CRL; name = X509_CRL_get_issuer(x->crl); X509_CRL_digest(x->crl, evpmd, digest, NULL); } else { ++errs; goto end; } if (name != NULL) { if ((h == HASH_NEW) || (h == HASH_BOTH)) errs += add_entry(type, X509_NAME_hash(name), filename, digest, 1, ~0); if ((h == HASH_OLD) || (h == HASH_BOTH)) errs += add_entry(type, X509_NAME_hash_old(name), filename, digest, 1, ~0); } end: sk_X509_INFO_pop_free(inf, X509_INFO_free); return errs; } static void str_free(char *s) { OPENSSL_free(s); } static int ends_with_dirsep(const char *path) { if (*path != '\0') path += strlen(path) - 1; # if defined __VMS if (*path == ']' || *path == '>' || *path == ':') return 1; # elif defined _WIN32 if (*path == '\\') return 1; # endif return *path == '/'; } static int massage_filename(char *name) { # ifdef __VMS char *p = strchr(name, ';'); char *q = p; if (q != NULL) { for (q++; *q != '\0'; q++) { if (!isdigit((unsigned char)*q)) return 1; } } *p = '\0'; # endif return 1; } /* * Process a directory; return number of errors found. */ static int do_dir(const char *dirname, enum Hash h) { BUCKET *bp, *nextbp; HENTRY *ep, *nextep; OPENSSL_DIR_CTX *d = NULL; struct stat st; unsigned char idmask[MAX_COLLISIONS / 8]; int n, numfiles, nextid, buflen, errs = 0; size_t i; const char *pathsep; const char *filename; char *buf, *copy; STACK_OF(OPENSSL_STRING) *files = NULL; if (app_access(dirname, W_OK) < 0) { BIO_printf(bio_err, "Skipping %s, can't write\n", dirname); return 1; } buflen = strlen(dirname); pathsep = (buflen && !ends_with_dirsep(dirname)) ? "/": ""; buflen += NAME_MAX + 1 + 1; buf = app_malloc(buflen, "filename buffer"); if (verbose) BIO_printf(bio_out, "Doing %s\n", dirname); if ((files = sk_OPENSSL_STRING_new_null()) == NULL) { BIO_printf(bio_err, "Skipping %s, out of memory\n", dirname); exit(1); } while ((filename = OPENSSL_DIR_read(&d, dirname)) != NULL) { if ((copy = strdup(filename)) == NULL || !massage_filename(copy) || sk_OPENSSL_STRING_push(files, copy) == 0) { BIO_puts(bio_err, "out of memory\n"); exit(1); } } OPENSSL_DIR_end(&d); sk_OPENSSL_STRING_sort(files); numfiles = sk_OPENSSL_STRING_num(files); for (n = 0; n < numfiles; ++n) { filename = sk_OPENSSL_STRING_value(files, n); if (BIO_snprintf(buf, buflen, "%s%s%s", dirname, pathsep, filename) >= buflen) continue; if (lstat(buf, &st) < 0) continue; if (S_ISLNK(st.st_mode) && handle_symlink(filename, buf) == 0) continue; errs += do_file(filename, buf, h); } sk_OPENSSL_STRING_pop_free(files, str_free); for (i = 0; i < OSSL_NELEM(hash_table); i++) { for (bp = hash_table[i]; bp; bp = nextbp) { nextbp = bp->next; nextid = 0; memset(idmask, 0, (bp->num_needed + 7) / 8); for (ep = bp->first_entry; ep; ep = ep->next) if (ep->old_id < bp->num_needed) bit_set(idmask, ep->old_id); for (ep = bp->first_entry; ep; ep = nextep) { nextep = ep->next; if (ep->old_id < bp->num_needed) { /* Link exists, and is used as-is */ BIO_snprintf(buf, buflen, "%08x.%s%d", bp->hash, suffixes[bp->type], ep->old_id); if (verbose) BIO_printf(bio_out, "link %s -> %s\n", ep->filename, buf); } else if (ep->need_symlink) { /* New link needed (it may replace something) */ while (bit_isset(idmask, nextid)) nextid++; BIO_snprintf(buf, buflen, "%s%s%n%08x.%s%d", dirname, pathsep, &n, bp->hash, suffixes[bp->type], nextid); if (verbose) BIO_printf(bio_out, "link %s -> %s\n", ep->filename, &buf[n]); if (unlink(buf) < 0 && errno != ENOENT) { BIO_printf(bio_err, "%s: Can't unlink %s, %s\n", opt_getprog(), buf, strerror(errno)); errs++; } if (symlink(ep->filename, buf) < 0) { BIO_printf(bio_err, "%s: Can't symlink %s, %s\n", opt_getprog(), ep->filename, strerror(errno)); errs++; } bit_set(idmask, nextid); } else if (remove_links) { /* Link to be deleted */ BIO_snprintf(buf, buflen, "%s%s%n%08x.%s%d", dirname, pathsep, &n, bp->hash, suffixes[bp->type], ep->old_id); if (verbose) BIO_printf(bio_out, "unlink %s\n", &buf[n]); if (unlink(buf) < 0 && errno != ENOENT) { BIO_printf(bio_err, "%s: Can't unlink %s, %s\n", opt_getprog(), buf, strerror(errno)); errs++; } } OPENSSL_free(ep->filename); OPENSSL_free(ep); } OPENSSL_free(bp); } hash_table[i] = NULL; } OPENSSL_free(buf); return errs; } typedef enum OPTION_choice { OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, OPT_COMPAT, OPT_OLD, OPT_N, OPT_VERBOSE } OPTION_CHOICE; const OPTIONS rehash_options[] = { {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert-directory...]\n"}, {OPT_HELP_STR, 1, '-', "Valid options are:\n"}, {"help", OPT_HELP, '-', "Display this summary"}, {"h", OPT_HELP, '-', "Display this summary"}, {"compat", OPT_COMPAT, '-', "Create both new- and old-style hash links"}, {"old", OPT_OLD, '-', "Use old-style hash to generate links"}, {"n", OPT_N, '-', "Do not remove existing links"}, {"v", OPT_VERBOSE, '-', "Verbose output"}, {NULL} }; int rehash_main(int argc, char **argv) { const char *env, *prog; char *e, *m; int errs = 0; OPTION_CHOICE o; enum Hash h = HASH_NEW; prog = opt_init(argc, argv, rehash_options); while ((o = opt_next()) != OPT_EOF) { switch (o) { case OPT_EOF: case OPT_ERR: BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); goto end; case OPT_HELP: opt_help(rehash_options); goto end; case OPT_COMPAT: h = HASH_BOTH; break; case OPT_OLD: h = HASH_OLD; break; case OPT_N: remove_links = 0; break; case OPT_VERBOSE: verbose = 1; break; } } argc = opt_num_rest(); argv = opt_rest(); evpmd = EVP_sha1(); evpmdsize = EVP_MD_size(evpmd); if (*argv != NULL) { while (*argv != NULL) errs += do_dir(*argv++, h); } else if ((env = getenv("SSL_CERT_DIR")) != NULL) { m = OPENSSL_strdup(env); for (e = strtok(m, ":"); e != NULL; e = strtok(NULL, ":")) errs += do_dir(e, h); OPENSSL_free(m); } else { errs += do_dir("/etc/ssl/certs", h); } end: return errs; } #else const OPTIONS rehash_options[] = { {NULL} }; int rehash_main(int argc, char **argv) { BIO_printf(bio_err, "Not available; use c_rehash script\n"); return 1; } #endif /* defined(OPENSSL_SYS_UNIX) || defined(__APPLE__) */