From 74de254bb92c684cf53461da97f52d5ba34ded80 Mon Sep 17 00:00:00 2001 From: "djm@openbsd.org" Date: Thu, 4 Dec 2014 01:49:59 +0000 Subject: [PATCH] upstream commit convert KRL code to new buffer API ok markus@ --- krl.c | 653 ++++++++++++++++++++++-------------------- krl.h | 38 +-- sshbuf-getput-basic.c | 4 +- 3 files changed, 358 insertions(+), 337 deletions(-) diff --git a/krl.c b/krl.c index e56f884f6..5a5cdde02 100644 --- a/krl.c +++ b/krl.c @@ -14,7 +14,7 @@ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ -/* $OpenBSD: krl.c,v 1.19 2014/11/21 01:00:38 djm Exp $ */ +/* $OpenBSD: krl.c,v 1.20 2014/12/04 01:49:59 djm Exp $ */ #include "includes.h" @@ -30,12 +30,12 @@ #include #include -#include "buffer.h" -#include "key.h" +#include "sshbuf.h" +#include "sshkey.h" #include "authfile.h" #include "misc.h" #include "log.h" -#include "xmalloc.h" +#include "ssherr.h" #include "krl.h" @@ -72,7 +72,7 @@ RB_GENERATE_STATIC(revoked_key_id_tree, revoked_key_id, tree_entry, key_id_cmp); /* Tree of blobs (used for keys and fingerprints) */ struct revoked_blob { u_char *blob; - u_int len; + size_t len; RB_ENTRY(revoked_blob) tree_entry; }; static int blob_cmp(struct revoked_blob *a, struct revoked_blob *b); @@ -81,7 +81,7 @@ RB_GENERATE_STATIC(revoked_blob_tree, revoked_blob, tree_entry, blob_cmp); /* Tracks revoked certs for a single CA */ struct revoked_certs { - Key *ca_key; + struct sshkey *ca_key; struct revoked_serial_tree revoked_serials; struct revoked_key_id_tree revoked_key_ids; TAILQ_ENTRY(revoked_certs) entry; @@ -155,7 +155,7 @@ revoked_certs_free(struct revoked_certs *rc) free(rki); } if (rc->ca_key != NULL) - key_free(rc->ca_key); + sshkey_free(rc->ca_key); } void @@ -190,12 +190,13 @@ ssh_krl_set_version(struct ssh_krl *krl, u_int64_t version) krl->krl_version = version; } -void +int ssh_krl_set_comment(struct ssh_krl *krl, const char *comment) { free(krl->comment); if ((krl->comment = strdup(comment)) == NULL) - fatal("%s: strdup", __func__); + return SSH_ERR_ALLOC_FAIL; + return 0; } /* @@ -203,14 +204,15 @@ ssh_krl_set_comment(struct ssh_krl *krl, const char *comment) * create a new one in the tree if one did not exist already. */ static int -revoked_certs_for_ca_key(struct ssh_krl *krl, const Key *ca_key, +revoked_certs_for_ca_key(struct ssh_krl *krl, const struct sshkey *ca_key, struct revoked_certs **rcp, int allow_create) { struct revoked_certs *rc; + int r; *rcp = NULL; TAILQ_FOREACH(rc, &krl->revoked_certs, entry) { - if (key_equal(rc->ca_key, ca_key)) { + if (sshkey_equal(rc->ca_key, ca_key)) { *rcp = rc; return 0; } @@ -219,15 +221,15 @@ revoked_certs_for_ca_key(struct ssh_krl *krl, const Key *ca_key, return 0; /* If this CA doesn't exist in the list then add it now */ if ((rc = calloc(1, sizeof(*rc))) == NULL) - return -1; - if ((rc->ca_key = key_from_private(ca_key)) == NULL) { + return SSH_ERR_ALLOC_FAIL; + if ((r = sshkey_from_private(ca_key, &rc->ca_key)) != 0) { free(rc); - return -1; + return r; } RB_INIT(&rc->revoked_serials); RB_INIT(&rc->revoked_key_ids); TAILQ_INSERT_TAIL(&krl->revoked_certs, rc, entry); - debug3("%s: new CA %s", __func__, key_type(ca_key)); + debug3("%s: new CA %s", __func__, sshkey_type(ca_key)); *rcp = rc; return 0; } @@ -245,14 +247,14 @@ insert_serial_range(struct revoked_serial_tree *rt, u_int64_t lo, u_int64_t hi) if (ers == NULL || serial_cmp(ers, &rs) != 0) { /* No entry matches. Just insert */ if ((irs = malloc(sizeof(rs))) == NULL) - return -1; + return SSH_ERR_ALLOC_FAIL; memcpy(irs, &rs, sizeof(*irs)); ers = RB_INSERT(revoked_serial_tree, rt, irs); if (ers != NULL) { KRL_DBG(("%s: bad: ers != NULL", __func__)); /* Shouldn't happen */ free(irs); - return -1; + return SSH_ERR_ALLOC_FAIL; } ers = irs; } else { @@ -305,40 +307,42 @@ insert_serial_range(struct revoked_serial_tree *rt, u_int64_t lo, u_int64_t hi) } int -ssh_krl_revoke_cert_by_serial(struct ssh_krl *krl, const Key *ca_key, +ssh_krl_revoke_cert_by_serial(struct ssh_krl *krl, const struct sshkey *ca_key, u_int64_t serial) { return ssh_krl_revoke_cert_by_serial_range(krl, ca_key, serial, serial); } int -ssh_krl_revoke_cert_by_serial_range(struct ssh_krl *krl, const Key *ca_key, +ssh_krl_revoke_cert_by_serial_range(struct ssh_krl *krl, const struct sshkey *ca_key, u_int64_t lo, u_int64_t hi) { struct revoked_certs *rc; + int r; if (lo > hi || lo == 0) return -1; - if (revoked_certs_for_ca_key(krl, ca_key, &rc, 1) != 0) - return -1; + if ((r = revoked_certs_for_ca_key(krl, ca_key, &rc, 1)) != 0) + return r; return insert_serial_range(&rc->revoked_serials, lo, hi); } int -ssh_krl_revoke_cert_by_key_id(struct ssh_krl *krl, const Key *ca_key, +ssh_krl_revoke_cert_by_key_id(struct ssh_krl *krl, const struct sshkey *ca_key, const char *key_id) { struct revoked_key_id *rki, *erki; struct revoked_certs *rc; + int r; - if (revoked_certs_for_ca_key(krl, ca_key, &rc, 1) != 0) - return -1; + if ((r = revoked_certs_for_ca_key(krl, ca_key, &rc, 1)) != 0) + return r; debug3("%s: revoke %s", __func__, key_id); if ((rki = calloc(1, sizeof(*rki))) == NULL || (rki->key_id = strdup(key_id)) == NULL) { free(rki); - fatal("%s: strdup", __func__); + return SSH_ERR_ALLOC_FAIL; } erki = RB_INSERT(revoked_key_id_tree, &rc->revoked_key_ids, rki); if (erki != NULL) { @@ -350,21 +354,20 @@ ssh_krl_revoke_cert_by_key_id(struct ssh_krl *krl, const Key *ca_key, /* Convert "key" to a public key blob without any certificate information */ static int -plain_key_blob(const Key *key, u_char **blob, u_int *blen) +plain_key_blob(const struct sshkey *key, u_char **blob, size_t *blen) { - Key *kcopy; + struct sshkey *kcopy; int r; - if ((kcopy = key_from_private(key)) == NULL) - return -1; - if (key_is_cert(kcopy)) { - if (key_drop_cert(kcopy) != 0) { - error("%s: key_drop_cert", __func__); - key_free(kcopy); - return -1; + if ((r = sshkey_from_private(key, &kcopy)) != 0) + return r; + if (sshkey_is_cert(kcopy)) { + if ((r = sshkey_drop_cert(kcopy)) != 0) { + sshkey_free(kcopy); + return r; } } - r = key_to_blob(kcopy, blob, blen); + r = sshkey_to_blob(kcopy, blob, blen); free(kcopy); return r; } @@ -376,7 +379,7 @@ revoke_blob(struct revoked_blob_tree *rbt, u_char *blob, u_int len) struct revoked_blob *rb, *erb; if ((rb = calloc(1, sizeof(*rb))) == NULL) - return -1; + return SSH_ERR_ALLOC_FAIL; rb->blob = blob; rb->len = len; erb = RB_INSERT(revoked_blob_tree, rbt, rb); @@ -388,36 +391,38 @@ revoke_blob(struct revoked_blob_tree *rbt, u_char *blob, u_int len) } int -ssh_krl_revoke_key_explicit(struct ssh_krl *krl, const Key *key) +ssh_krl_revoke_key_explicit(struct ssh_krl *krl, const struct sshkey *key) { u_char *blob; - u_int len; + size_t len; + int r; - debug3("%s: revoke type %s", __func__, key_type(key)); - if (plain_key_blob(key, &blob, &len) < 0) - return -1; + debug3("%s: revoke type %s", __func__, sshkey_type(key)); + if ((r = plain_key_blob(key, &blob, &len)) != 0) + return r; return revoke_blob(&krl->revoked_keys, blob, len); } int -ssh_krl_revoke_key_sha1(struct ssh_krl *krl, const Key *key) +ssh_krl_revoke_key_sha1(struct ssh_krl *krl, const struct sshkey *key) { u_char *blob; - u_int len; + size_t len; + int r; - debug3("%s: revoke type %s by sha1", __func__, key_type(key)); - if ((blob = key_fingerprint_raw(key, SSH_FP_SHA1, &len)) == NULL) - return -1; + debug3("%s: revoke type %s by sha1", __func__, sshkey_type(key)); + if ((r = sshkey_fingerprint_raw(key, SSH_FP_SHA1, &blob, &len)) != 0) + return r; return revoke_blob(&krl->revoked_sha1s, blob, len); } int -ssh_krl_revoke_key(struct ssh_krl *krl, const Key *key) +ssh_krl_revoke_key(struct ssh_krl *krl, const struct sshkey *key) { - if (!key_is_cert(key)) + if (!sshkey_is_cert(key)) return ssh_krl_revoke_key_sha1(krl, key); - if (key_cert_is_legacy(key) || key->cert->serial == 0) { + if (sshkey_cert_is_legacy(key) || key->cert->serial == 0) { return ssh_krl_revoke_cert_by_key_id(krl, key->cert->signature_key, key->cert->key_id); @@ -429,8 +434,8 @@ ssh_krl_revoke_key(struct ssh_krl *krl, const Key *key) } /* - * Select a copact next section type to emit in a KRL based on the - * current section type, the run length of contiguous revoked serial + * Select the most compact section type to emit next in a KRL based on + * the current section type, the run length of contiguous revoked serial * numbers and the gaps from the last and to the next revoked serial. * Applies a mostly-accurate bit cost model to select the section type * that will minimise the size of the resultant KRL. @@ -513,29 +518,26 @@ choose_next_state(int current_state, u_int64_t contig, int final, /* Generate a KRL_SECTION_CERTIFICATES KRL section */ static int -revoked_certs_generate(struct revoked_certs *rc, Buffer *buf) +revoked_certs_generate(struct revoked_certs *rc, struct sshbuf *buf) { int final, force_new_sect, r = -1; u_int64_t i, contig, gap, last = 0, bitmap_start = 0; struct revoked_serial *rs, *nrs; struct revoked_key_id *rki; int next_state, state = 0; - Buffer sect; - u_char *kblob = NULL; - u_int klen; + struct sshbuf *sect; BIGNUM *bitmap = NULL; - /* Prepare CA scope key blob if we have one supplied */ - if (key_to_blob(rc->ca_key, &kblob, &klen) == 0) - return -1; + if ((sect = sshbuf_new()) == NULL) + return SSH_ERR_ALLOC_FAIL; - buffer_init(§); + /* Store the header: CA scope key, reserved */ + if ((r = sshkey_to_blob_buf(rc->ca_key, sect)) != 0 || + (r = sshbuf_put_stringb(buf, sect)) != 0 || + (r = sshbuf_put_string(buf, NULL, 0)) != 0) + goto out; - /* Store the header */ - buffer_put_string(buf, kblob, klen); - buffer_put_string(buf, NULL, 0); /* Reserved */ - - free(kblob); + sshbuf_reset(sect); /* Store the revoked serials. */ for (rs = RB_MIN(revoked_serial_tree, &rc->revoked_serials); @@ -567,31 +569,36 @@ revoked_certs_generate(struct revoked_certs *rc, Buffer *buf) case KRL_SECTION_CERT_SERIAL_RANGE: break; case KRL_SECTION_CERT_SERIAL_BITMAP: - buffer_put_bignum2(§, bitmap); + if ((r = sshbuf_put_bignum2(sect, bitmap)) != 0) + goto out; BN_free(bitmap); bitmap = NULL; break; } - buffer_put_char(buf, state); - buffer_put_string(buf, - buffer_ptr(§), buffer_len(§)); - buffer_clear(§); + if ((r = sshbuf_put_u8(buf, state)) != 0 || + (r = sshbuf_put_stringb(buf, sect)) != 0) + goto out; + sshbuf_reset(sect); } /* If we are starting a new section then prepare it now */ if (next_state != state || force_new_sect) { debug3("%s: start state 0x%02x", __func__, next_state); state = next_state; - buffer_clear(§); + sshbuf_reset(sect); switch (state) { case KRL_SECTION_CERT_SERIAL_LIST: case KRL_SECTION_CERT_SERIAL_RANGE: break; case KRL_SECTION_CERT_SERIAL_BITMAP: - if ((bitmap = BN_new()) == NULL) + if ((bitmap = BN_new()) == NULL) { + r = SSH_ERR_ALLOC_FAIL; goto out; + } bitmap_start = rs->lo; - buffer_put_int64(§, bitmap_start); + if ((r = sshbuf_put_u64(sect, + bitmap_start)) != 0) + goto out; break; } } @@ -599,12 +606,15 @@ revoked_certs_generate(struct revoked_certs *rc, Buffer *buf) /* Perform section-specific processing */ switch (state) { case KRL_SECTION_CERT_SERIAL_LIST: - for (i = 0; i < contig; i++) - buffer_put_int64(§, rs->lo + i); + for (i = 0; i < contig; i++) { + if ((r = sshbuf_put_u64(sect, rs->lo + i)) != 0) + goto out; + } break; case KRL_SECTION_CERT_SERIAL_RANGE: - buffer_put_int64(§, rs->lo); - buffer_put_int64(§, rs->hi); + if ((r = sshbuf_put_u64(sect, rs->lo)) != 0 || + (r = sshbuf_put_u64(sect, rs->hi)) != 0) + goto out; break; case KRL_SECTION_CERT_SERIAL_BITMAP: if (rs->lo - bitmap_start > INT_MAX) { @@ -613,8 +623,10 @@ revoked_certs_generate(struct revoked_certs *rc, Buffer *buf) } for (i = 0; i < contig; i++) { if (BN_set_bit(bitmap, - rs->lo + i - bitmap_start) != 1) + rs->lo + i - bitmap_start) != 1) { + r = SSH_ERR_ALLOC_FAIL; goto out; + } } break; } @@ -629,113 +641,122 @@ revoked_certs_generate(struct revoked_certs *rc, Buffer *buf) case KRL_SECTION_CERT_SERIAL_RANGE: break; case KRL_SECTION_CERT_SERIAL_BITMAP: - buffer_put_bignum2(§, bitmap); + if ((r = sshbuf_put_bignum2(sect, bitmap)) != 0) + goto out; BN_free(bitmap); bitmap = NULL; break; } - buffer_put_char(buf, state); - buffer_put_string(buf, - buffer_ptr(§), buffer_len(§)); + if ((r = sshbuf_put_u8(buf, state)) != 0 || + (r = sshbuf_put_stringb(buf, sect)) != 0) + goto out; } debug3("%s: serial done ", __func__); /* Now output a section for any revocations by key ID */ - buffer_clear(§); + sshbuf_reset(sect); RB_FOREACH(rki, revoked_key_id_tree, &rc->revoked_key_ids) { debug3("%s: key ID %s", __func__, rki->key_id); - buffer_put_cstring(§, rki->key_id); + if ((r = sshbuf_put_cstring(sect, rki->key_id)) != 0) + goto out; } - if (buffer_len(§) != 0) { - buffer_put_char(buf, KRL_SECTION_CERT_KEY_ID); - buffer_put_string(buf, buffer_ptr(§), - buffer_len(§)); + if (sshbuf_len(sect) != 0) { + if ((r = sshbuf_put_u8(buf, KRL_SECTION_CERT_KEY_ID)) != 0 || + (r = sshbuf_put_stringb(buf, sect)) != 0) + goto out; } r = 0; out: if (bitmap != NULL) BN_free(bitmap); - buffer_free(§); + sshbuf_free(sect); return r; } int -ssh_krl_to_blob(struct ssh_krl *krl, Buffer *buf, const Key **sign_keys, - u_int nsign_keys) +ssh_krl_to_blob(struct ssh_krl *krl, struct sshbuf *buf, + const struct sshkey **sign_keys, u_int nsign_keys) { int r = -1; struct revoked_certs *rc; struct revoked_blob *rb; - Buffer sect; - u_char *kblob = NULL, *sblob = NULL; - u_int klen, slen, i; + struct sshbuf *sect; + u_char *sblob = NULL; + size_t slen, i; if (krl->generated_date == 0) krl->generated_date = time(NULL); - buffer_init(§); + if ((sect = sshbuf_new()) == NULL) + return SSH_ERR_ALLOC_FAIL; /* Store the header */ - buffer_append(buf, KRL_MAGIC, sizeof(KRL_MAGIC) - 1); - buffer_put_int(buf, KRL_FORMAT_VERSION); - buffer_put_int64(buf, krl->krl_version); - buffer_put_int64(buf, krl->generated_date); - buffer_put_int64(buf, krl->flags); - buffer_put_string(buf, NULL, 0); - buffer_put_cstring(buf, krl->comment ? krl->comment : ""); + if ((r = sshbuf_put(buf, KRL_MAGIC, sizeof(KRL_MAGIC) - 1)) != 0 || + (r = sshbuf_put_u32(buf, KRL_FORMAT_VERSION)) != 0 || + (r = sshbuf_put_u64(buf, krl->krl_version)) != 0 || + (r = sshbuf_put_u64(buf, krl->generated_date) != 0) || + (r = sshbuf_put_u64(buf, krl->flags)) != 0 || + (r = sshbuf_put_string(buf, NULL, 0)) != 0 || + (r = sshbuf_put_cstring(buf, krl->comment)) != 0) + goto out; /* Store sections for revoked certificates */ TAILQ_FOREACH(rc, &krl->revoked_certs, entry) { - buffer_clear(§); - if (revoked_certs_generate(rc, §) != 0) + sshbuf_reset(sect); + if ((r = revoked_certs_generate(rc, sect)) != 0) + goto out; + if ((r = sshbuf_put_u8(buf, KRL_SECTION_CERTIFICATES)) != 0 || + (r = sshbuf_put_stringb(buf, sect)) != 0) goto out; - buffer_put_char(buf, KRL_SECTION_CERTIFICATES); - buffer_put_string(buf, buffer_ptr(§), - buffer_len(§)); } /* Finally, output sections for revocations by public key/hash */ - buffer_clear(§); + sshbuf_reset(sect); RB_FOREACH(rb, revoked_blob_tree, &krl->revoked_keys) { - debug3("%s: key len %u ", __func__, rb->len); - buffer_put_string(§, rb->blob, rb->len); + debug3("%s: key len %zu ", __func__, rb->len); + if ((sshbuf_put_string(sect, rb->blob, rb->len)) != 0) + goto out; } - if (buffer_len(§) != 0) { - buffer_put_char(buf, KRL_SECTION_EXPLICIT_KEY); - buffer_put_string(buf, buffer_ptr(§), - buffer_len(§)); + if (sshbuf_len(sect) != 0) { + if ((r = sshbuf_put_u8(buf, KRL_SECTION_EXPLICIT_KEY)) != 0 || + (r = sshbuf_put_stringb(buf, sect)) != 0) + goto out; } - buffer_clear(§); + sshbuf_reset(sect); RB_FOREACH(rb, revoked_blob_tree, &krl->revoked_sha1s) { - debug3("%s: hash len %u ", __func__, rb->len); - buffer_put_string(§, rb->blob, rb->len); + debug3("%s: hash len %zu ", __func__, rb->len); + if ((sshbuf_put_string(sect, rb->blob, rb->len)) != 0) + goto out; } - if (buffer_len(§) != 0) { - buffer_put_char(buf, KRL_SECTION_FINGERPRINT_SHA1); - buffer_put_string(buf, buffer_ptr(§), - buffer_len(§)); + if (sshbuf_len(sect) != 0) { + if ((r = sshbuf_put_u8(buf, + KRL_SECTION_FINGERPRINT_SHA1)) != 0 || + (r = sshbuf_put_stringb(buf, sect)) != 0) + goto out; } for (i = 0; i < nsign_keys; i++) { - if (key_to_blob(sign_keys[i], &kblob, &klen) == 0) + sshbuf_reset(sect); + if ((r = sshkey_to_blob_buf(sign_keys[i], sect)) != 0) goto out; - debug3("%s: signature key len %u", __func__, klen); - buffer_put_char(buf, KRL_SECTION_SIGNATURE); - buffer_put_string(buf, kblob, klen); - - if (key_sign(sign_keys[i], &sblob, &slen, - buffer_ptr(buf), buffer_len(buf)) == -1) + debug3("%s: signature key len %zu", __func__, sshbuf_len(sect)); + if ((r = sshbuf_put_u8(buf, KRL_SECTION_SIGNATURE)) != 0 || + (r = sshbuf_put_stringb(buf, sect)) != 0) + goto out; + + if ((r = sshkey_sign(sign_keys[i], &sblob, &slen, + sshbuf_ptr(buf), sshbuf_len(buf), 0)) == -1) + goto out; + debug3("%s: signature sig len %zu", __func__, slen); + if ((r = sshbuf_put_string(buf, sblob, slen)) != 0) goto out; - debug3("%s: signature sig len %u", __func__, slen); - buffer_put_string(buf, sblob, slen); } r = 0; out: - free(kblob); free(sblob); - buffer_free(§); + sshbuf_free(sect); return r; } @@ -756,189 +777,167 @@ format_timestamp(u_int64_t timestamp, char *ts, size_t nts) } static int -parse_revoked_certs(Buffer *buf, struct ssh_krl *krl) +parse_revoked_certs(struct sshbuf *buf, struct ssh_krl *krl) { - int ret = -1, nbits; + int r = -1, nbits; u_char type; const u_char *blob; - u_int blen; - Buffer subsect; + size_t blen; + struct sshbuf *subsect = NULL; u_int64_t serial, serial_lo, serial_hi; BIGNUM *bitmap = NULL; char *key_id = NULL; - Key *ca_key = NULL; + struct sshkey *ca_key = NULL; - buffer_init(&subsect); + if ((subsect = sshbuf_new()) == NULL) + return SSH_ERR_ALLOC_FAIL; - if ((blob = buffer_get_string_ptr_ret(buf, &blen)) == NULL || - buffer_get_string_ptr_ret(buf, NULL) == NULL) { /* reserved */ - error("%s: buffer error", __func__); + /* Header: key, reserved */ + if ((r = sshbuf_get_string_direct(buf, &blob, &blen)) != 0 || + (r = sshbuf_skip_string(buf)) != 0) goto out; - } - if ((ca_key = key_from_blob(blob, blen)) == NULL) + if ((r = sshkey_from_blob(blob, blen, &ca_key)) != 0) goto out; - while (buffer_len(buf) > 0) { - if (buffer_get_char_ret(&type, buf) != 0 || - (blob = buffer_get_string_ptr_ret(buf, &blen)) == NULL) { - error("%s: buffer error", __func__); - goto out; + while (sshbuf_len(buf) > 0) { + if (subsect != NULL) { + sshbuf_free(subsect); + subsect = NULL; } - buffer_clear(&subsect); - buffer_append(&subsect, blob, blen); + if ((r = sshbuf_get_u8(buf, &type)) != 0 || + (r = sshbuf_froms(buf, &subsect)) != 0) + goto out; debug3("%s: subsection type 0x%02x", __func__, type); - /* buffer_dump(&subsect); */ switch (type) { case KRL_SECTION_CERT_SERIAL_LIST: - while (buffer_len(&subsect) > 0) { - if (buffer_get_int64_ret(&serial, - &subsect) != 0) { - error("%s: buffer error", __func__); + while (sshbuf_len(subsect) > 0) { + if ((r = sshbuf_get_u64(subsect, &serial)) != 0) goto out; - } - if (ssh_krl_revoke_cert_by_serial(krl, ca_key, - serial) != 0) { - error("%s: update failed", __func__); + if ((r = ssh_krl_revoke_cert_by_serial(krl, + ca_key, serial)) != 0) goto out; - } } break; case KRL_SECTION_CERT_SERIAL_RANGE: - if (buffer_get_int64_ret(&serial_lo, &subsect) != 0 || - buffer_get_int64_ret(&serial_hi, &subsect) != 0) { - error("%s: buffer error", __func__); + if ((r = sshbuf_get_u64(subsect, &serial_lo)) != 0 || + (r = sshbuf_get_u64(subsect, &serial_hi)) != 0) goto out; - } - if (ssh_krl_revoke_cert_by_serial_range(krl, ca_key, - serial_lo, serial_hi) != 0) { - error("%s: update failed", __func__); + if ((r = ssh_krl_revoke_cert_by_serial_range(krl, + ca_key, serial_lo, serial_hi)) != 0) goto out; - } break; case KRL_SECTION_CERT_SERIAL_BITMAP: if ((bitmap = BN_new()) == NULL) { - error("%s: BN_new", __func__); + r = SSH_ERR_ALLOC_FAIL; goto out; } - if (buffer_get_int64_ret(&serial_lo, &subsect) != 0 || - buffer_get_bignum2_ret(&subsect, bitmap) != 0) { - error("%s: buffer error", __func__); + if ((r = sshbuf_get_u64(subsect, &serial_lo)) != 0 || + (r = sshbuf_get_bignum2(subsect, bitmap)) != 0) goto out; - } if ((nbits = BN_num_bits(bitmap)) < 0) { error("%s: bitmap bits < 0", __func__); + r = SSH_ERR_INVALID_FORMAT; goto out; } for (serial = 0; serial < (u_int)nbits; serial++) { if (serial > 0 && serial_lo + serial == 0) { error("%s: bitmap wraps u64", __func__); + r = SSH_ERR_INVALID_FORMAT; goto out; } if (!BN_is_bit_set(bitmap, serial)) continue; - if (ssh_krl_revoke_cert_by_serial(krl, ca_key, - serial_lo + serial) != 0) { - error("%s: update failed", __func__); + if ((r = ssh_krl_revoke_cert_by_serial(krl, + ca_key, serial_lo + serial)) != 0) goto out; - } } BN_free(bitmap); bitmap = NULL; break; case KRL_SECTION_CERT_KEY_ID: - while (buffer_len(&subsect) > 0) { - if ((key_id = buffer_get_cstring_ret(&subsect, - NULL)) == NULL) { - error("%s: buffer error", __func__); + while (sshbuf_len(subsect) > 0) { + if ((r = sshbuf_get_cstring(subsect, + &key_id, NULL)) != 0) goto out; - } - if (ssh_krl_revoke_cert_by_key_id(krl, ca_key, - key_id) != 0) { - error("%s: update failed", __func__); + if ((r = ssh_krl_revoke_cert_by_key_id(krl, + ca_key, key_id)) != 0) goto out; - } free(key_id); key_id = NULL; } break; default: error("Unsupported KRL certificate section %u", type); + r = SSH_ERR_INVALID_FORMAT; goto out; } - if (buffer_len(&subsect) > 0) { + if (sshbuf_len(subsect) > 0) { error("KRL certificate section contains unparsed data"); + r = SSH_ERR_INVALID_FORMAT; goto out; } } - ret = 0; + r = 0; out: - if (ca_key != NULL) - key_free(ca_key); if (bitmap != NULL) BN_free(bitmap); free(key_id); - buffer_free(&subsect); - return ret; + sshkey_free(ca_key); + sshbuf_free(subsect); + return r; } /* Attempt to parse a KRL, checking its signature (if any) with sign_ca_keys. */ int -ssh_krl_from_blob(Buffer *buf, struct ssh_krl **krlp, - const Key **sign_ca_keys, u_int nsign_ca_keys) +ssh_krl_from_blob(struct sshbuf *buf, struct ssh_krl **krlp, + const struct sshkey **sign_ca_keys, u_int nsign_ca_keys) { - Buffer copy, sect; - struct ssh_krl *krl; + struct sshbuf *copy = NULL, *sect = NULL; + struct ssh_krl *krl = NULL; char timestamp[64]; - int ret = -1, r, sig_seen; - Key *key = NULL, **ca_used = NULL; + int r = -1, sig_seen; + struct sshkey *key = NULL, **ca_used = NULL, **tmp_ca_used; u_char type, *rdata = NULL; const u_char *blob; - u_int i, j, sig_off, sects_off, rlen, blen, format_version, nca_used; + size_t i, j, sig_off, sects_off, rlen, blen, nca_used; + u_int format_version; nca_used = 0; *krlp = NULL; - if (buffer_len(buf) < sizeof(KRL_MAGIC) - 1 || - memcmp(buffer_ptr(buf), KRL_MAGIC, sizeof(KRL_MAGIC) - 1) != 0) { + if (sshbuf_len(buf) < sizeof(KRL_MAGIC) - 1 || + memcmp(sshbuf_ptr(buf), KRL_MAGIC, sizeof(KRL_MAGIC) - 1) != 0) { debug3("%s: not a KRL", __func__); - /* - * Return success but a NULL *krlp here to signal that the - * file might be a simple list of keys. - */ - return 0; + return SSH_ERR_KRL_BAD_MAGIC; } /* Take a copy of the KRL buffer so we can verify its signature later */ - buffer_init(©); - buffer_append(©, buffer_ptr(buf), buffer_len(buf)); - - buffer_init(§); - buffer_consume(©, sizeof(KRL_MAGIC) - 1); + if ((copy = sshbuf_fromb(buf)) == NULL) { + r = SSH_ERR_ALLOC_FAIL; + goto out; + } + if ((r = sshbuf_consume(copy, sizeof(KRL_MAGIC) - 1)) != 0) + goto out; if ((krl = ssh_krl_init()) == NULL) { error("%s: alloc failed", __func__); goto out; } - if (buffer_get_int_ret(&format_version, ©) != 0) { - error("%s: KRL truncated", __func__); + if ((r = sshbuf_get_u32(copy, &format_version)) != 0) goto out; - } if (format_version != KRL_FORMAT_VERSION) { - error("%s: KRL unsupported format version %u", - __func__, format_version); + r = SSH_ERR_INVALID_FORMAT; goto out; } - if (buffer_get_int64_ret(&krl->krl_version, ©) != 0 || - buffer_get_int64_ret(&krl->generated_date, ©) != 0 || - buffer_get_int64_ret(&krl->flags, ©) != 0 || - buffer_get_string_ptr_ret(©, NULL) == NULL || /* reserved */ - (krl->comment = buffer_get_cstring_ret(©, NULL)) == NULL) { - error("%s: buffer error", __func__); + if ((r = sshbuf_get_u64(copy, &krl->krl_version)) != 0 || + (r = sshbuf_get_u64(copy, &krl->generated_date)) != 0 || + (r = sshbuf_get_u64(copy, &krl->flags)) != 0 || + (r = sshbuf_skip_string(copy)) != 0 || + (r = sshbuf_get_cstring(copy, &krl->comment, NULL)) != 0) goto out; - } format_timestamp(krl->generated_date, timestamp, sizeof(timestamp)); debug("KRL version %llu generated at %s%s%s", @@ -950,16 +949,20 @@ ssh_krl_from_blob(Buffer *buf, struct ssh_krl **krlp, * detailed parsing of data whose provenance is unverified. */ sig_seen = 0; - sects_off = buffer_len(buf) - buffer_len(©); - while (buffer_len(©) > 0) { - if (buffer_get_char_ret(&type, ©) != 0 || - (blob = buffer_get_string_ptr_ret(©, &blen)) == NULL) { - error("%s: buffer error", __func__); + if (sshbuf_len(buf) < sshbuf_len(copy)) { + /* Shouldn't happen */ + r = SSH_ERR_INTERNAL_ERROR; + goto out; + } + sects_off = sshbuf_len(buf) - sshbuf_len(copy); + while (sshbuf_len(copy) > 0) { + if ((r = sshbuf_get_u8(copy, &type)) != 0 || + (r = sshbuf_get_string_direct(copy, &blob, &blen)) != 0) goto out; - } debug3("%s: first pass, section 0x%02x", __func__, type); if (type != KRL_SECTION_SIGNATURE) { if (sig_seen) { + r = SSH_ERR_INVALID_FORMAT; error("KRL contains non-signature section " "after signature"); goto out; @@ -969,94 +972,118 @@ ssh_krl_from_blob(Buffer *buf, struct ssh_krl **krlp, } sig_seen = 1; /* First string component is the signing key */ - if ((key = key_from_blob(blob, blen)) == NULL) { + if ((r = sshkey_from_blob(blob, blen, &key)) != 0) { + r = SSH_ERR_INVALID_FORMAT; error("%s: invalid signature key", __func__); goto out; } - sig_off = buffer_len(buf) - buffer_len(©); + if (sshbuf_len(buf) < sshbuf_len(copy)) { + /* Shouldn't happen */ + r = SSH_ERR_INTERNAL_ERROR; + goto out; + } + sig_off = sshbuf_len(buf) - sshbuf_len(copy); /* Second string component is the signature itself */ - if ((blob = buffer_get_string_ptr_ret(©, &blen)) == NULL) { - error("%s: buffer error", __func__); + if ((r = sshbuf_get_string_direct(copy, &blob, &blen)) != 0) { + r = SSH_ERR_INVALID_FORMAT; goto out; } /* Check signature over entire KRL up to this point */ - if (key_verify(key, blob, blen, - buffer_ptr(buf), buffer_len(buf) - sig_off) != 1) { + if ((r = sshkey_verify(key, blob, blen, + sshbuf_ptr(buf), sshbuf_len(buf) - sig_off, 0)) != 0) { error("bad signaure on KRL"); goto out; } /* Check if this key has already signed this KRL */ for (i = 0; i < nca_used; i++) { - if (key_equal(ca_used[i], key)) { + if (sshkey_equal(ca_used[i], key)) { error("KRL signed more than once with " "the same key"); + r = SSH_ERR_SIGNATURE_INVALID; goto out; } } /* Record keys used to sign the KRL */ - ca_used = xrealloc(ca_used, nca_used + 1, sizeof(*ca_used)); + tmp_ca_used = reallocarray(ca_used, nca_used + 1, + sizeof(*ca_used)); + if (tmp_ca_used == NULL) { + r = SSH_ERR_ALLOC_FAIL; + goto out; + } + ca_used = tmp_ca_used; ca_used[nca_used++] = key; key = NULL; break; } + if (sshbuf_len(copy) != 0) { + /* Shouldn't happen */ + r = SSH_ERR_INTERNAL_ERROR; + goto out; + } + /* * 2nd pass: parse and load the KRL, skipping the header to the point * where the section start. */ - buffer_append(©, (u_char*)buffer_ptr(buf) + sects_off, - buffer_len(buf) - sects_off); - while (buffer_len(©) > 0) { - if (buffer_get_char_ret(&type, ©) != 0 || - (blob = buffer_get_string_ptr_ret(©, &blen)) == NULL) { - error("%s: buffer error", __func__); + sshbuf_free(copy); + if ((copy = sshbuf_fromb(buf)) == NULL) { + r = SSH_ERR_ALLOC_FAIL; + goto out; + } + if ((r = sshbuf_consume(copy, sects_off)) != 0) + goto out; + while (sshbuf_len(copy) > 0) { + if (sect != NULL) { + sshbuf_free(sect); + sect = NULL; + } + if ((r = sshbuf_get_u8(copy, &type)) != 0 || + (r = sshbuf_froms(copy, §)) != 0) { goto out; } debug3("%s: second pass, section 0x%02x", __func__, type); - buffer_clear(§); - buffer_append(§, blob, blen); switch (type) { case KRL_SECTION_CERTIFICATES: - if ((r = parse_revoked_certs(§, krl)) != 0) + if ((r = parse_revoked_certs(sect, krl)) != 0) goto out; break; case KRL_SECTION_EXPLICIT_KEY: case KRL_SECTION_FINGERPRINT_SHA1: - while (buffer_len(§) > 0) { - if ((rdata = buffer_get_string_ret(§, - &rlen)) == NULL) { - error("%s: buffer error", __func__); + while (sshbuf_len(sect) > 0) { + if ((r = sshbuf_get_string(sect, + &rdata, &rlen)) != 0) goto out; - } if (type == KRL_SECTION_FINGERPRINT_SHA1 && rlen != 20) { error("%s: bad SHA1 length", __func__); + r = SSH_ERR_INVALID_FORMAT; goto out; } - if (revoke_blob( + if ((r = revoke_blob( type == KRL_SECTION_EXPLICIT_KEY ? &krl->revoked_keys : &krl->revoked_sha1s, - rdata, rlen) != 0) + rdata, rlen)) != 0) goto out; rdata = NULL; /* revoke_blob frees blob */ } break; case KRL_SECTION_SIGNATURE: /* Handled above, but still need to stay in synch */ - buffer_clear(§); - if ((blob = buffer_get_string_ptr_ret(©, - &blen)) == NULL) { - error("%s: buffer error", __func__); + sshbuf_reset(sect); + sect = NULL; + if ((r = sshbuf_skip_string(copy)) != 0) goto out; - } break; default: error("Unsupported KRL section %u", type); + r = SSH_ERR_INVALID_FORMAT; goto out; } - if (buffer_len(§) > 0) { + if (sshbuf_len(sect) > 0) { error("KRL section contains unparsed data"); + r = SSH_ERR_INVALID_FORMAT; goto out; } } @@ -1067,11 +1094,12 @@ ssh_krl_from_blob(Buffer *buf, struct ssh_krl **krlp, if (ssh_krl_check_key(krl, ca_used[i]) == 0) sig_seen = 1; else { - key_free(ca_used[i]); + sshkey_free(ca_used[i]); ca_used[i] = NULL; } } if (nca_used && !sig_seen) { + r = SSH_ERR_SIGNATURE_INVALID; error("All keys used to sign KRL were revoked"); goto out; } @@ -1083,74 +1111,74 @@ ssh_krl_from_blob(Buffer *buf, struct ssh_krl **krlp, for (j = 0; j < nca_used; j++) { if (ca_used[j] == NULL) continue; - if (key_equal(ca_used[j], sign_ca_keys[i])) { + if (sshkey_equal(ca_used[j], sign_ca_keys[i])) { sig_seen = 1; break; } } } if (!sig_seen) { + r = SSH_ERR_SIGNATURE_INVALID; error("KRL not signed with any trusted key"); goto out; } } *krlp = krl; - ret = 0; + r = 0; out: - if (ret != 0) + if (r != 0) ssh_krl_free(krl); - for (i = 0; i < nca_used; i++) { - if (ca_used[i] != NULL) - key_free(ca_used[i]); - } + for (i = 0; i < nca_used; i++) + sshkey_free(ca_used[i]); free(ca_used); free(rdata); - if (key != NULL) - key_free(key); - buffer_free(©); - buffer_free(§); - return ret; + sshkey_free(key); + sshbuf_free(copy); + sshbuf_free(sect); + return r; } /* Checks whether a given key/cert is revoked. Does not check its CA */ static int -is_key_revoked(struct ssh_krl *krl, const Key *key) +is_key_revoked(struct ssh_krl *krl, const struct sshkey *key) { struct revoked_blob rb, *erb; struct revoked_serial rs, *ers; struct revoked_key_id rki, *erki; struct revoked_certs *rc; + int r; /* Check explicitly revoked hashes first */ memset(&rb, 0, sizeof(rb)); - if ((rb.blob = key_fingerprint_raw(key, SSH_FP_SHA1, &rb.len)) == NULL) - return -1; + if ((r = sshkey_fingerprint_raw(key, SSH_FP_SHA1, + &rb.blob, &rb.len)) != 0) + return r; erb = RB_FIND(revoked_blob_tree, &krl->revoked_sha1s, &rb); free(rb.blob); if (erb != NULL) { debug("%s: revoked by key SHA1", __func__); - return -1; + return SSH_ERR_KEY_REVOKED; } /* Next, explicit keys */ memset(&rb, 0, sizeof(rb)); - if (plain_key_blob(key, &rb.blob, &rb.len) < 0) - return -1; + if ((r = plain_key_blob(key, &rb.blob, &rb.len)) != 0) + return r; erb = RB_FIND(revoked_blob_tree, &krl->revoked_keys, &rb); free(rb.blob); if (erb != NULL) { debug("%s: revoked by explicit key", __func__); - return -1; + return SSH_ERR_KEY_REVOKED; } - if (!key_is_cert(key)) + if (!sshkey_is_cert(key)) return 0; /* Check cert revocation */ - if (revoked_certs_for_ca_key(krl, key->cert->signature_key, - &rc, 0) != 0) - return -1; + if ((r = revoked_certs_for_ca_key(krl, key->cert->signature_key, + &rc, 0)) != 0) + return r; if (rc == NULL) return 0; /* No entry for this CA */ @@ -1160,14 +1188,14 @@ is_key_revoked(struct ssh_krl *krl, const Key *key) erki = RB_FIND(revoked_key_id_tree, &rc->revoked_key_ids, &rki); if (erki != NULL) { debug("%s: revoked by key ID", __func__); - return -1; + return SSH_ERR_KEY_REVOKED; } /* * Legacy cert formats lack serial numbers. Zero serials numbers * are ignored (it's the default when the CA doesn't specify one). */ - if (key_cert_is_legacy(key) || key->cert->serial == 0) + if (sshkey_cert_is_legacy(key) || key->cert->serial == 0) return 0; memset(&rs, 0, sizeof(rs)); @@ -1177,7 +1205,7 @@ is_key_revoked(struct ssh_krl *krl, const Key *key) KRL_DBG(("%s: %llu matched %llu:%llu", __func__, key->cert->serial, ers->lo, ers->hi)); debug("%s: revoked by serial", __func__); - return -1; + return SSH_ERR_KEY_REVOKED; } KRL_DBG(("%s: %llu no match", __func__, key->cert->serial)); @@ -1185,14 +1213,14 @@ is_key_revoked(struct ssh_krl *krl, const Key *key) } int -ssh_krl_check_key(struct ssh_krl *krl, const Key *key) +ssh_krl_check_key(struct ssh_krl *krl, const struct sshkey *key) { int r; debug2("%s: checking key", __func__); if ((r = is_key_revoked(krl, key)) != 0) return r; - if (key_is_cert(key)) { + if (sshkey_is_cert(key)) { debug2("%s: checking CA key", __func__); if ((r = is_key_revoked(krl, key->cert->signature_key)) != 0) return r; @@ -1201,45 +1229,36 @@ ssh_krl_check_key(struct ssh_krl *krl, const Key *key) return 0; } -/* Returns 0 on success, -1 on error or key revoked, -2 if path is not a KRL */ int -ssh_krl_file_contains_key(const char *path, const Key *key) +ssh_krl_file_contains_key(const char *path, const struct sshkey *key) { - Buffer krlbuf; - struct ssh_krl *krl; - int revoked, fd; + struct sshbuf *krlbuf = NULL; + struct ssh_krl *krl = NULL; + int oerrno = 0, r, fd; if (path == NULL) return 0; + if ((krlbuf = sshbuf_new()) == NULL) + return SSH_ERR_ALLOC_FAIL; if ((fd = open(path, O_RDONLY)) == -1) { - error("open %s: %s", path, strerror(errno)); - error("Revoked keys file not accessible - refusing public key " - "authentication"); - return -1; + r = SSH_ERR_SYSTEM_ERROR; + oerrno = errno; + goto out; } - buffer_init(&krlbuf); - if (!key_load_file(fd, path, &krlbuf)) { - close(fd); - buffer_free(&krlbuf); - error("Revoked keys file not readable - refusing public key " - "authentication"); - return -1; - } - close(fd); - if (ssh_krl_from_blob(&krlbuf, &krl, NULL, 0) != 0) { - buffer_free(&krlbuf); - error("Invalid KRL, refusing public key " - "authentication"); - return -1; - } - buffer_free(&krlbuf); - if (krl == NULL) { - debug3("%s: %s is not a KRL file", __func__, path); - return -2; + if ((r = sshkey_load_file(fd, path, krlbuf)) != 0) { + oerrno = errno; + goto out; } + if ((r = ssh_krl_from_blob(krlbuf, &krl, NULL, 0)) != 0) + goto out; debug2("%s: checking KRL %s", __func__, path); - revoked = ssh_krl_check_key(krl, key) != 0; + r = ssh_krl_check_key(krl, key); + out: + close(fd); + sshbuf_free(krlbuf); ssh_krl_free(krl); - return revoked ? -1 : 0; + if (r != 0) + errno = oerrno; + return r; } diff --git a/krl.h b/krl.h index 2c43f5bb2..c98cc139d 100644 --- a/krl.h +++ b/krl.h @@ -14,7 +14,7 @@ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ -/* $OpenBSD: krl.h,v 1.2 2013/01/18 00:24:58 djm Exp $ */ +/* $OpenBSD: krl.h,v 1.3 2014/12/04 01:49:59 djm Exp $ */ #ifndef _KRL_H #define _KRL_H @@ -36,28 +36,30 @@ #define KRL_SECTION_CERT_SERIAL_BITMAP 0x22 #define KRL_SECTION_CERT_KEY_ID 0x23 +struct sshkey; +struct sshbuf; struct ssh_krl; struct ssh_krl *ssh_krl_init(void); void ssh_krl_free(struct ssh_krl *krl); void ssh_krl_set_version(struct ssh_krl *krl, u_int64_t version); -void ssh_krl_set_sign_key(struct ssh_krl *krl, const Key *sign_key); -void ssh_krl_set_comment(struct ssh_krl *krl, const char *comment); -int ssh_krl_revoke_cert_by_serial(struct ssh_krl *krl, const Key *ca_key, - u_int64_t serial); -int ssh_krl_revoke_cert_by_serial_range(struct ssh_krl *krl, const Key *ca_key, - u_int64_t lo, u_int64_t hi); -int ssh_krl_revoke_cert_by_key_id(struct ssh_krl *krl, const Key *ca_key, - const char *key_id); -int ssh_krl_revoke_key_explicit(struct ssh_krl *krl, const Key *key); -int ssh_krl_revoke_key_sha1(struct ssh_krl *krl, const Key *key); -int ssh_krl_revoke_key(struct ssh_krl *krl, const Key *key); -int ssh_krl_to_blob(struct ssh_krl *krl, Buffer *buf, const Key **sign_keys, - u_int nsign_keys); -int ssh_krl_from_blob(Buffer *buf, struct ssh_krl **krlp, - const Key **sign_ca_keys, u_int nsign_ca_keys); -int ssh_krl_check_key(struct ssh_krl *krl, const Key *key); -int ssh_krl_file_contains_key(const char *path, const Key *key); +void ssh_krl_set_sign_key(struct ssh_krl *krl, const struct sshkey *sign_key); +int ssh_krl_set_comment(struct ssh_krl *krl, const char *comment); +int ssh_krl_revoke_cert_by_serial(struct ssh_krl *krl, + const struct sshkey *ca_key, u_int64_t serial); +int ssh_krl_revoke_cert_by_serial_range(struct ssh_krl *krl, + const struct sshkey *ca_key, u_int64_t lo, u_int64_t hi); +int ssh_krl_revoke_cert_by_key_id(struct ssh_krl *krl, + const struct sshkey *ca_key, const char *key_id); +int ssh_krl_revoke_key_explicit(struct ssh_krl *krl, const struct sshkey *key); +int ssh_krl_revoke_key_sha1(struct ssh_krl *krl, const struct sshkey *key); +int ssh_krl_revoke_key(struct ssh_krl *krl, const struct sshkey *key); +int ssh_krl_to_blob(struct ssh_krl *krl, struct sshbuf *buf, + const struct sshkey **sign_keys, u_int nsign_keys); +int ssh_krl_from_blob(struct sshbuf *buf, struct ssh_krl **krlp, + const struct sshkey **sign_ca_keys, u_int nsign_ca_keys); +int ssh_krl_check_key(struct ssh_krl *krl, const struct sshkey *key); +int ssh_krl_file_contains_key(const char *path, const struct sshkey *key); #endif /* _KRL_H */ diff --git a/sshbuf-getput-basic.c b/sshbuf-getput-basic.c index b7d0758c2..682b68d58 100644 --- a/sshbuf-getput-basic.c +++ b/sshbuf-getput-basic.c @@ -1,4 +1,4 @@ -/* $OpenBSD: sshbuf-getput-basic.c,v 1.1 2014/04/30 05:29:56 djm Exp $ */ +/* $OpenBSD: sshbuf-getput-basic.c,v 1.2 2014/12/04 01:49:59 djm Exp $ */ /* * Copyright (c) 2011 Damien Miller * @@ -359,7 +359,7 @@ sshbuf_put_string(struct sshbuf *buf, const void *v, size_t len) int sshbuf_put_cstring(struct sshbuf *buf, const char *v) { - return sshbuf_put_string(buf, (u_char *)v, strlen(v)); + return sshbuf_put_string(buf, (u_char *)v, v == NULL ? 0 : strlen(v)); } int