Migrate passwd encrypt/verify to PBKDF2 modular crypt format using
kernel cryptodev (CRYPTO_PBKDF2_HMAC_SHA256 via /dev/crypto). Add
passwd_pbkdf2 wrapper, base64url helpers, complexity validation, and
pbkdf2_test for RFC 6070 vector coverage. FSUTILS_PASSWD selects
CRYPTO, ALLOW_BSD_COMPONENTS, and CRYPTO_CRYPTODEV so existing sim
defconfigs keep building. Change NSH_LOGIN_USERNAME default to root and
remove fixed-login password defaults.
BREAKING CHANGE: TEA-encoded /etc/passwd entries no longer verify.
Regenerate each entry after upgrading. Pair with the nuttx host mkpasswd
changes in apache/nuttx#19209. Boards must enable the appropriate
software or hardware crypto backend for PBKDF2 at runtime. When
CONFIG_NSH_LOGIN_FIXED=y, set CONFIG_NSH_LOGIN_PASSWORD in the board
defconfig or menuconfig; there is no default password.
Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
Rename base64_encode, base64_decode, and ecc_make_key in bundled
libtomcrypt to avoid duplicate symbol link errors when dropbear is built
alongside netutils/codecs and NuttX crypto (e.g. sim:dropbear).
Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
The per-session NSH task is reaped with waitpid() in
dropbear_nshsession.c. Without CONFIG_SCHED_CHILD_STATUS the kernel does
not retain the child exit status, so waitpid() returns ECHILD right after
authentication and the interactive session never starts
("NSH session wait failed: Unknown error 10").
Depend on SCHED_HAVE_PARENT and SCHED_CHILD_STATUS (following the project's
depends-on-over-select convention) so the requirement is explicit; boards
enabling Dropbear must set these in their defconfig.
Signed-off-by: Felipe Moura <moura.fmo@gmail.com>
Dropbear gathers its entropy from /dev/urandom (libtomcrypt's
rng_get_bytes tries /dev/urandom before /dev/random), so requiring
ARCH_HAVE_RNG and DEV_RANDOM shuts the port out of targets without a
hardware TRNG -- including the simulator, where a dropbear
configuration silently loses NETUTILS_DROPBEAR at configure time.
Keep only the DEV_URANDOM requirement.
Signed-off-by: Felipe Moura <moura.fmo@gmail.com>
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>
