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-rw-r--r--sshbuf-getput-basic.c633
1 files changed, 633 insertions, 0 deletions
diff --git a/sshbuf-getput-basic.c b/sshbuf-getput-basic.c
new file mode 100644
index 0000000..5c71b0e
--- /dev/null
+++ b/sshbuf-getput-basic.c
@@ -0,0 +1,633 @@
+/* $OpenBSD: sshbuf-getput-basic.c,v 1.13 2022/05/25 06:03:44 djm Exp $ */
+/*
+ * Copyright (c) 2011 Damien Miller
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#define SSHBUF_INTERNAL
+#include "includes.h"
+
+#include <sys/types.h>
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
+
+#include "ssherr.h"
+#include "sshbuf.h"
+
+int
+sshbuf_get(struct sshbuf *buf, void *v, size_t len)
+{
+ const u_char *p = sshbuf_ptr(buf);
+ int r;
+
+ if ((r = sshbuf_consume(buf, len)) < 0)
+ return r;
+ if (v != NULL && len != 0)
+ memcpy(v, p, len);
+ return 0;
+}
+
+int
+sshbuf_get_u64(struct sshbuf *buf, u_int64_t *valp)
+{
+ const u_char *p = sshbuf_ptr(buf);
+ int r;
+
+ if ((r = sshbuf_consume(buf, 8)) < 0)
+ return r;
+ if (valp != NULL)
+ *valp = PEEK_U64(p);
+ return 0;
+}
+
+int
+sshbuf_get_u32(struct sshbuf *buf, u_int32_t *valp)
+{
+ const u_char *p = sshbuf_ptr(buf);
+ int r;
+
+ if ((r = sshbuf_consume(buf, 4)) < 0)
+ return r;
+ if (valp != NULL)
+ *valp = PEEK_U32(p);
+ return 0;
+}
+
+int
+sshbuf_get_u16(struct sshbuf *buf, u_int16_t *valp)
+{
+ const u_char *p = sshbuf_ptr(buf);
+ int r;
+
+ if ((r = sshbuf_consume(buf, 2)) < 0)
+ return r;
+ if (valp != NULL)
+ *valp = PEEK_U16(p);
+ return 0;
+}
+
+int
+sshbuf_get_u8(struct sshbuf *buf, u_char *valp)
+{
+ const u_char *p = sshbuf_ptr(buf);
+ int r;
+
+ if ((r = sshbuf_consume(buf, 1)) < 0)
+ return r;
+ if (valp != NULL)
+ *valp = (u_int8_t)*p;
+ return 0;
+}
+
+static int
+check_offset(const struct sshbuf *buf, int wr, size_t offset, size_t len)
+{
+ if (sshbuf_ptr(buf) == NULL) /* calls sshbuf_check_sanity() */
+ return SSH_ERR_INTERNAL_ERROR;
+ if (offset >= SIZE_MAX - len)
+ return SSH_ERR_INVALID_ARGUMENT;
+ if (offset + len > sshbuf_len(buf)) {
+ return wr ?
+ SSH_ERR_NO_BUFFER_SPACE : SSH_ERR_MESSAGE_INCOMPLETE;
+ }
+ return 0;
+}
+
+static int
+check_roffset(const struct sshbuf *buf, size_t offset, size_t len,
+ const u_char **p)
+{
+ int r;
+
+ *p = NULL;
+ if ((r = check_offset(buf, 0, offset, len)) != 0)
+ return r;
+ *p = sshbuf_ptr(buf) + offset;
+ return 0;
+}
+
+int
+sshbuf_peek_u64(const struct sshbuf *buf, size_t offset, u_int64_t *valp)
+{
+ const u_char *p = NULL;
+ int r;
+
+ if (valp != NULL)
+ *valp = 0;
+ if ((r = check_roffset(buf, offset, 8, &p)) != 0)
+ return r;
+ if (valp != NULL)
+ *valp = PEEK_U64(p);
+ return 0;
+}
+
+int
+sshbuf_peek_u32(const struct sshbuf *buf, size_t offset, u_int32_t *valp)
+{
+ const u_char *p = NULL;
+ int r;
+
+ if (valp != NULL)
+ *valp = 0;
+ if ((r = check_roffset(buf, offset, 4, &p)) != 0)
+ return r;
+ if (valp != NULL)
+ *valp = PEEK_U32(p);
+ return 0;
+}
+
+int
+sshbuf_peek_u16(const struct sshbuf *buf, size_t offset, u_int16_t *valp)
+{
+ const u_char *p = NULL;
+ int r;
+
+ if (valp != NULL)
+ *valp = 0;
+ if ((r = check_roffset(buf, offset, 2, &p)) != 0)
+ return r;
+ if (valp != NULL)
+ *valp = PEEK_U16(p);
+ return 0;
+}
+
+int
+sshbuf_peek_u8(const struct sshbuf *buf, size_t offset, u_char *valp)
+{
+ const u_char *p = NULL;
+ int r;
+
+ if (valp != NULL)
+ *valp = 0;
+ if ((r = check_roffset(buf, offset, 1, &p)) != 0)
+ return r;
+ if (valp != NULL)
+ *valp = *p;
+ return 0;
+}
+
+int
+sshbuf_get_string(struct sshbuf *buf, u_char **valp, size_t *lenp)
+{
+ const u_char *val;
+ size_t len;
+ int r;
+
+ if (valp != NULL)
+ *valp = NULL;
+ if (lenp != NULL)
+ *lenp = 0;
+ if ((r = sshbuf_get_string_direct(buf, &val, &len)) < 0)
+ return r;
+ if (valp != NULL) {
+ if ((*valp = malloc(len + 1)) == NULL) {
+ SSHBUF_DBG(("SSH_ERR_ALLOC_FAIL"));
+ return SSH_ERR_ALLOC_FAIL;
+ }
+ if (len != 0)
+ memcpy(*valp, val, len);
+ (*valp)[len] = '\0';
+ }
+ if (lenp != NULL)
+ *lenp = len;
+ return 0;
+}
+
+int
+sshbuf_get_string_direct(struct sshbuf *buf, const u_char **valp, size_t *lenp)
+{
+ size_t len;
+ const u_char *p;
+ int r;
+
+ if (valp != NULL)
+ *valp = NULL;
+ if (lenp != NULL)
+ *lenp = 0;
+ if ((r = sshbuf_peek_string_direct(buf, &p, &len)) < 0)
+ return r;
+ if (valp != NULL)
+ *valp = p;
+ if (lenp != NULL)
+ *lenp = len;
+ if (sshbuf_consume(buf, len + 4) != 0) {
+ /* Shouldn't happen */
+ SSHBUF_DBG(("SSH_ERR_INTERNAL_ERROR"));
+ SSHBUF_ABORT();
+ return SSH_ERR_INTERNAL_ERROR;
+ }
+ return 0;
+}
+
+int
+sshbuf_peek_string_direct(const struct sshbuf *buf, const u_char **valp,
+ size_t *lenp)
+{
+ u_int32_t len;
+ const u_char *p = sshbuf_ptr(buf);
+
+ if (valp != NULL)
+ *valp = NULL;
+ if (lenp != NULL)
+ *lenp = 0;
+ if (sshbuf_len(buf) < 4) {
+ SSHBUF_DBG(("SSH_ERR_MESSAGE_INCOMPLETE"));
+ return SSH_ERR_MESSAGE_INCOMPLETE;
+ }
+ len = PEEK_U32(p);
+ if (len > SSHBUF_SIZE_MAX - 4) {
+ SSHBUF_DBG(("SSH_ERR_STRING_TOO_LARGE"));
+ return SSH_ERR_STRING_TOO_LARGE;
+ }
+ if (sshbuf_len(buf) - 4 < len) {
+ SSHBUF_DBG(("SSH_ERR_MESSAGE_INCOMPLETE"));
+ return SSH_ERR_MESSAGE_INCOMPLETE;
+ }
+ if (valp != NULL)
+ *valp = p + 4;
+ if (lenp != NULL)
+ *lenp = len;
+ return 0;
+}
+
+int
+sshbuf_get_cstring(struct sshbuf *buf, char **valp, size_t *lenp)
+{
+ size_t len;
+ const u_char *p, *z;
+ int r;
+
+ if (valp != NULL)
+ *valp = NULL;
+ if (lenp != NULL)
+ *lenp = 0;
+ if ((r = sshbuf_peek_string_direct(buf, &p, &len)) != 0)
+ return r;
+ /* Allow a \0 only at the end of the string */
+ if (len > 0 &&
+ (z = memchr(p , '\0', len)) != NULL && z < p + len - 1) {
+ SSHBUF_DBG(("SSH_ERR_INVALID_FORMAT"));
+ return SSH_ERR_INVALID_FORMAT;
+ }
+ if ((r = sshbuf_skip_string(buf)) != 0)
+ return -1;
+ if (valp != NULL) {
+ if ((*valp = malloc(len + 1)) == NULL) {
+ SSHBUF_DBG(("SSH_ERR_ALLOC_FAIL"));
+ return SSH_ERR_ALLOC_FAIL;
+ }
+ if (len != 0)
+ memcpy(*valp, p, len);
+ (*valp)[len] = '\0';
+ }
+ if (lenp != NULL)
+ *lenp = (size_t)len;
+ return 0;
+}
+
+int
+sshbuf_get_stringb(struct sshbuf *buf, struct sshbuf *v)
+{
+ u_int32_t len;
+ u_char *p;
+ int r;
+
+ /*
+ * Use sshbuf_peek_string_direct() to figure out if there is
+ * a complete string in 'buf' and copy the string directly
+ * into 'v'.
+ */
+ if ((r = sshbuf_peek_string_direct(buf, NULL, NULL)) != 0 ||
+ (r = sshbuf_get_u32(buf, &len)) != 0 ||
+ (r = sshbuf_reserve(v, len, &p)) != 0 ||
+ (r = sshbuf_get(buf, p, len)) != 0)
+ return r;
+ return 0;
+}
+
+int
+sshbuf_put(struct sshbuf *buf, const void *v, size_t len)
+{
+ u_char *p;
+ int r;
+
+ if ((r = sshbuf_reserve(buf, len, &p)) < 0)
+ return r;
+ if (len != 0)
+ memcpy(p, v, len);
+ return 0;
+}
+
+int
+sshbuf_putb(struct sshbuf *buf, const struct sshbuf *v)
+{
+ if (v == NULL)
+ return 0;
+ return sshbuf_put(buf, sshbuf_ptr(v), sshbuf_len(v));
+}
+
+int
+sshbuf_putf(struct sshbuf *buf, const char *fmt, ...)
+{
+ va_list ap;
+ int r;
+
+ va_start(ap, fmt);
+ r = sshbuf_putfv(buf, fmt, ap);
+ va_end(ap);
+ return r;
+}
+
+int
+sshbuf_putfv(struct sshbuf *buf, const char *fmt, va_list ap)
+{
+ va_list ap2;
+ int r, len;
+ u_char *p;
+
+ VA_COPY(ap2, ap);
+ if ((len = vsnprintf(NULL, 0, fmt, ap2)) < 0) {
+ r = SSH_ERR_INVALID_ARGUMENT;
+ goto out;
+ }
+ if (len == 0) {
+ r = 0;
+ goto out; /* Nothing to do */
+ }
+ va_end(ap2);
+ VA_COPY(ap2, ap);
+ if ((r = sshbuf_reserve(buf, (size_t)len + 1, &p)) < 0)
+ goto out;
+ if ((r = vsnprintf((char *)p, len + 1, fmt, ap2)) != len) {
+ r = SSH_ERR_INTERNAL_ERROR;
+ goto out; /* Shouldn't happen */
+ }
+ /* Consume terminating \0 */
+ if ((r = sshbuf_consume_end(buf, 1)) != 0)
+ goto out;
+ r = 0;
+ out:
+ va_end(ap2);
+ return r;
+}
+
+int
+sshbuf_put_u64(struct sshbuf *buf, u_int64_t val)
+{
+ u_char *p;
+ int r;
+
+ if ((r = sshbuf_reserve(buf, 8, &p)) < 0)
+ return r;
+ POKE_U64(p, val);
+ return 0;
+}
+
+int
+sshbuf_put_u32(struct sshbuf *buf, u_int32_t val)
+{
+ u_char *p;
+ int r;
+
+ if ((r = sshbuf_reserve(buf, 4, &p)) < 0)
+ return r;
+ POKE_U32(p, val);
+ return 0;
+}
+
+int
+sshbuf_put_u16(struct sshbuf *buf, u_int16_t val)
+{
+ u_char *p;
+ int r;
+
+ if ((r = sshbuf_reserve(buf, 2, &p)) < 0)
+ return r;
+ POKE_U16(p, val);
+ return 0;
+}
+
+int
+sshbuf_put_u8(struct sshbuf *buf, u_char val)
+{
+ u_char *p;
+ int r;
+
+ if ((r = sshbuf_reserve(buf, 1, &p)) < 0)
+ return r;
+ p[0] = val;
+ return 0;
+}
+
+static int
+check_woffset(struct sshbuf *buf, size_t offset, size_t len, u_char **p)
+{
+ int r;
+
+ *p = NULL;
+ if ((r = check_offset(buf, 1, offset, len)) != 0)
+ return r;
+ if (sshbuf_mutable_ptr(buf) == NULL)
+ return SSH_ERR_BUFFER_READ_ONLY;
+ *p = sshbuf_mutable_ptr(buf) + offset;
+ return 0;
+}
+
+int
+sshbuf_poke_u64(struct sshbuf *buf, size_t offset, u_int64_t val)
+{
+ u_char *p = NULL;
+ int r;
+
+ if ((r = check_woffset(buf, offset, 8, &p)) != 0)
+ return r;
+ POKE_U64(p, val);
+ return 0;
+}
+
+int
+sshbuf_poke_u32(struct sshbuf *buf, size_t offset, u_int32_t val)
+{
+ u_char *p = NULL;
+ int r;
+
+ if ((r = check_woffset(buf, offset, 4, &p)) != 0)
+ return r;
+ POKE_U32(p, val);
+ return 0;
+}
+
+int
+sshbuf_poke_u16(struct sshbuf *buf, size_t offset, u_int16_t val)
+{
+ u_char *p = NULL;
+ int r;
+
+ if ((r = check_woffset(buf, offset, 2, &p)) != 0)
+ return r;
+ POKE_U16(p, val);
+ return 0;
+}
+
+int
+sshbuf_poke_u8(struct sshbuf *buf, size_t offset, u_char val)
+{
+ u_char *p = NULL;
+ int r;
+
+ if ((r = check_woffset(buf, offset, 1, &p)) != 0)
+ return r;
+ *p = val;
+ return 0;
+}
+
+int
+sshbuf_poke(struct sshbuf *buf, size_t offset, void *v, size_t len)
+{
+ u_char *p = NULL;
+ int r;
+
+ if ((r = check_woffset(buf, offset, len, &p)) != 0)
+ return r;
+ memcpy(p, v, len);
+ return 0;
+}
+
+int
+sshbuf_put_string(struct sshbuf *buf, const void *v, size_t len)
+{
+ u_char *d;
+ int r;
+
+ if (len > SSHBUF_SIZE_MAX - 4) {
+ SSHBUF_DBG(("SSH_ERR_NO_BUFFER_SPACE"));
+ return SSH_ERR_NO_BUFFER_SPACE;
+ }
+ if ((r = sshbuf_reserve(buf, len + 4, &d)) < 0)
+ return r;
+ POKE_U32(d, len);
+ if (len != 0)
+ memcpy(d + 4, v, len);
+ return 0;
+}
+
+int
+sshbuf_put_cstring(struct sshbuf *buf, const char *v)
+{
+ return sshbuf_put_string(buf, v, v == NULL ? 0 : strlen(v));
+}
+
+int
+sshbuf_put_stringb(struct sshbuf *buf, const struct sshbuf *v)
+{
+ if (v == NULL)
+ return sshbuf_put_string(buf, NULL, 0);
+
+ return sshbuf_put_string(buf, sshbuf_ptr(v), sshbuf_len(v));
+}
+
+int
+sshbuf_froms(struct sshbuf *buf, struct sshbuf **bufp)
+{
+ const u_char *p;
+ size_t len;
+ struct sshbuf *ret;
+ int r;
+
+ if (buf == NULL || bufp == NULL)
+ return SSH_ERR_INVALID_ARGUMENT;
+ *bufp = NULL;
+ if ((r = sshbuf_peek_string_direct(buf, &p, &len)) != 0)
+ return r;
+ if ((ret = sshbuf_from(p, len)) == NULL)
+ return SSH_ERR_ALLOC_FAIL;
+ if ((r = sshbuf_consume(buf, len + 4)) != 0 || /* Shouldn't happen */
+ (r = sshbuf_set_parent(ret, buf)) != 0) {
+ sshbuf_free(ret);
+ return r;
+ }
+ *bufp = ret;
+ return 0;
+}
+
+int
+sshbuf_put_bignum2_bytes(struct sshbuf *buf, const void *v, size_t len)
+{
+ u_char *d;
+ const u_char *s = (const u_char *)v;
+ int r, prepend;
+
+ if (len > SSHBUF_SIZE_MAX - 5) {
+ SSHBUF_DBG(("SSH_ERR_NO_BUFFER_SPACE"));
+ return SSH_ERR_NO_BUFFER_SPACE;
+ }
+ /* Skip leading zero bytes */
+ for (; len > 0 && *s == 0; len--, s++)
+ ;
+ /*
+ * If most significant bit is set then prepend a zero byte to
+ * avoid interpretation as a negative number.
+ */
+ prepend = len > 0 && (s[0] & 0x80) != 0;
+ if ((r = sshbuf_reserve(buf, len + 4 + prepend, &d)) < 0)
+ return r;
+ POKE_U32(d, len + prepend);
+ if (prepend)
+ d[4] = 0;
+ if (len != 0)
+ memcpy(d + 4 + prepend, s, len);
+ return 0;
+}
+
+int
+sshbuf_get_bignum2_bytes_direct(struct sshbuf *buf,
+ const u_char **valp, size_t *lenp)
+{
+ const u_char *d;
+ size_t len, olen;
+ int r;
+
+ if ((r = sshbuf_peek_string_direct(buf, &d, &olen)) < 0)
+ return r;
+ len = olen;
+ /* Refuse negative (MSB set) bignums */
+ if ((len != 0 && (*d & 0x80) != 0))
+ return SSH_ERR_BIGNUM_IS_NEGATIVE;
+ /* Refuse overlong bignums, allow prepended \0 to avoid MSB set */
+ if (len > SSHBUF_MAX_BIGNUM + 1 ||
+ (len == SSHBUF_MAX_BIGNUM + 1 && *d != 0))
+ return SSH_ERR_BIGNUM_TOO_LARGE;
+ /* Trim leading zeros */
+ while (len > 0 && *d == 0x00) {
+ d++;
+ len--;
+ }
+ if (valp != NULL)
+ *valp = d;
+ if (lenp != NULL)
+ *lenp = len;
+ if (sshbuf_consume(buf, olen + 4) != 0) {
+ /* Shouldn't happen */
+ SSHBUF_DBG(("SSH_ERR_INTERNAL_ERROR"));
+ SSHBUF_ABORT();
+ return SSH_ERR_INTERNAL_ERROR;
+ }
+ return 0;
+}