mirror of
https://github.com/apache/nuttx-apps.git
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fee2ddbf54
Integrated SSH daemon authenticating against FSUTILS_PASSWD, with an ECDSA P-256 host key and an NSH session over a PTY per connection. Built from the upstream Dropbear tarball (pinned commit) and patched for NuttX, using Dropbear's bundled libtomcrypt for all crypto. setsid() (apache/nuttx#19184) and link() now come from NuttX, not local stubs. Signed-off-by: Felipe Moura <moura.fmo@gmail.com>
149 lines
2.9 KiB
C
149 lines
2.9 KiB
C
/****************************************************************************
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* apps/netutils/dropbear/port/dropbear_utils.c
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*
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* SPDX-License-Identifier: Apache-2.0
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include "dropbear_utils.h"
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#include <sys/stat.h>
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#include <errno.h>
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#include <limits.h>
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#include <string.h>
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#include <unistd.h>
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int dropbear_hex_value(char ch)
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{
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if (ch >= '0' && ch <= '9')
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{
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return ch - '0';
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}
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if (ch >= 'a' && ch <= 'f')
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{
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return ch - 'a' + 10;
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}
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if (ch >= 'A' && ch <= 'F')
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{
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return ch - 'A' + 10;
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}
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return -1;
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}
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static int dropbear_try_mkdir(FAR const char *path)
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{
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if (mkdir(path, 0700) < 0 && errno != EEXIST)
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{
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return -errno;
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}
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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void dropbear_hex_encode(FAR char *dst, FAR const uint8_t *src,
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size_t srclen)
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{
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static const char hex[] = "0123456789abcdef";
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size_t i;
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for (i = 0; i < srclen; i++)
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{
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dst[i * 2] = hex[src[i] >> 4];
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dst[i * 2 + 1] = hex[src[i] & 0x0f];
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}
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dst[srclen * 2] = '\0';
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}
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int dropbear_hex_decode(FAR const char *src, size_t srclen,
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FAR uint8_t *dst, size_t dstlen)
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{
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size_t i;
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if (srclen != dstlen * 2)
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{
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return -EINVAL;
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}
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for (i = 0; i < dstlen; i++)
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{
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int hi = dropbear_hex_value(src[i * 2]);
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int lo = dropbear_hex_value(src[i * 2 + 1]);
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if (hi < 0 || lo < 0)
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{
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return -EINVAL;
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}
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dst[i] = (uint8_t)((hi << 4) | lo);
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}
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return OK;
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}
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int dropbear_try_prepare_parent(FAR const char *path)
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{
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char dir[PATH_MAX];
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struct stat st;
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FAR char *slash;
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FAR char *p;
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int ret;
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if (strlcpy(dir, path, sizeof(dir)) >= sizeof(dir))
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{
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return -ENAMETOOLONG;
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}
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slash = strrchr(dir, '/');
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if (slash == NULL || slash == dir)
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{
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return OK;
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}
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*slash = '\0';
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if (stat(dir, &st) == 0)
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{
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return OK;
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}
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for (p = dir + 1; *p != '\0'; p++)
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{
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if (*p == '/')
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{
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*p = '\0';
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ret = dropbear_try_mkdir(dir);
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if (ret < 0)
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{
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return ret;
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}
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*p = '/';
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}
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}
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return dropbear_try_mkdir(dir);
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}
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#ifndef CONFIG_SCHED_USER_IDENTITY
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int dropbear_getgroups(int size, gid_t list[])
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{
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(void)size;
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(void)list;
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set_errno(ENOSYS);
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return ERROR;
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}
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#endif
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