Oups, sorry, here is the answer
root@OpenWrt:~# ubus call session login '{ "username": "testuser", "password": "testuser" }'
{
"ubus_rpc_session": "4877f1fc985cb49c3bb2c304d208062d",
"timeout": 300,
"expires": 299,
"acls": {
"access-group": {
"luci-app-firewall": [
"read",
"write"
],
"luci-app-opkg": [
"read",
"write"
],
"luci-base": [
"read",
"write"
],
"luci-base-network-status": [
"read"
],
"luci-mod-network-config": [
"read",
"write"
],
"luci-mod-network-dhcp": [
"read",
"write"
],
"luci-mod-network-diagnostics": [
"read"
],
"luci-mod-status-channel_analysis": [
"read"
],
"luci-mod-status-firewall": [
"read",
"write"
],
"luci-mod-status-index": [
"read",
"write"
],
"luci-mod-status-index-dhcp": [
"read"
],
"luci-mod-status-index-dsl": [
"read"
],
"luci-mod-status-index-wifi": [
"read",
"write"
],
"luci-mod-status-logs": [
"read"
],
"luci-mod-status-processes": [
"read",
"write"
],
"luci-mod-status-realtime": [
"read"
],
"luci-mod-status-routes": [
"read"
],
"luci-mod-system-config": [
"read",
"write"
],
"luci-mod-system-cron": [
"read",
"write"
],
"luci-mod-system-flash": [
"read",
"write"
],
"luci-mod-system-init": [
"read",
"write"
],
"luci-mod-system-mounts": [
"read",
"write"
],
"luci-mod-system-reboot": [
"write"
],
"luci-mod-system-ssh": [
"read",
"write"
],
"luci-mod-system-uhttpd": [
"read",
"write"
],
"unauthenticated": [
"read"
]
},
"cgi-io": {
"backup": [
"read"
],
"download": [
"read"
],
"exec": [
"read",
"write"
],
"upload": [
"write"
]
},
"file": {
"/": [
"list"
],
"/*": [
"list"
],
"/bin/dmesg -r": [
"exec"
],
"/bin/kill": [
"exec"
],
"/bin/ping": [
"exec"
],
"/bin/ping6": [
"exec",
"list"
],
"/bin/tar -tzf /tmp/backup.tar.gz": [
"exec"
],
"/bin/traceroute": [
"exec"
],
"/bin/traceroute6": [
"exec",
"list"
],
"/bin/umount": [
"exec"
],
"/dev/mtdblock[0-9]*": [
"read"
],
"/etc/crontabs/root": [
"read",
"write"
],
"/etc/dropbear/authorized_keys": [
"read",
"write"
],
"/etc/filesystems": [
"read"
],
"/etc/firewall.user": [
"read",
"write"
],
"/etc/init.d/cron reload": [
"exec"
],
"/etc/init.d/firewall restart": [
"exec"
],
"/etc/iproute2/rt_tables": [
"read"
],
"/etc/luci-uploads/*": [
"write"
],
"/etc/opkg.conf": [
"read",
"write"
],
"/etc/opkg/*.conf": [
"read",
"write"
],
"/etc/rc.local": [
"read",
"write"
],
"/etc/sysupgrade.conf": [
"read",
"write"
],
"/lib/upgrade/platform.sh": [
"list"
],
"/proc/filesystems": [
"read"
],
"/proc/mounts": [
"read"
],
"/proc/mtd": [
"read"
],
"/proc/partitions": [
"read"
],
"/proc/sys/kernel/hostname": [
"read"
],
"/proc/sys/net/ipv6/conf/*/mtu": [
"read"
],
"/proc/sys/net/ipv6/conf/*/hop_limit": [
"read"
],
"/proc/sys/net/netfilter/nf_conntrack_count": [
"read"
],
"/proc/sys/net/netfilter/nf_conntrack_max": [
"read"
],
"/sbin/block": [
"exec"
],
"/sbin/firstboot -r -y": [
"exec"
],
"/sbin/ifdown": [
"exec"
],
"/sbin/ifup": [
"exec"
],
"/sbin/ip -[46] neigh show": [
"exec"
],
"/sbin/ip -[46] route show table all": [
"exec"
],
"/sbin/ip -[46] rule show": [
"exec"
],
"/sbin/logread": [
"stat"
],
"/sbin/logread -e ^": [
"exec"
],
"/sbin/reboot": [
"exec"
],
"/sbin/sysupgrade --force -k /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade --force -u -k /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade --force -u /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade --force /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade --list-backup": [
"exec"
],
"/sbin/sysupgrade --restore-backup /tmp/backup.tar.gz": [
"exec"
],
"/sbin/sysupgrade --test /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade -k /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade -n --force /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade -n /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade -u -k /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade -u /tmp/firmware.bin": [
"exec"
],
"/sbin/sysupgrade /tmp/firmware.bin": [
"exec"
],
"/sbin/wifi": [
"exec"
],
"/tmp/backup.tar.gz": [
"write"
],
"/tmp/firmware.bin": [
"write"
],
"/tmp/upload.ipk": [
"write"
],
"/usr/bin/arp-scan": [
"exec",
"list"
],
"/usr/bin/btrfsck": [
"list"
],
"/usr/bin/nslookup": [
"exec"
],
"/usr/bin/ntfsfix": [
"list"
],
"/usr/bin/ping": [
"exec"
],
"/usr/bin/ping6": [
"exec",
"list"
],
"/usr/bin/traceroute": [
"exec"
],
"/usr/bin/traceroute6": [
"exec",
"list"
],
"/usr/lib/lua/luci/version.lua": [
"read"
],
"/usr/lib/opkg/info/netifd.control": [
"read"
],
"/usr/libexec/luci-peeraddr": [
"exec"
],
"/usr/libexec/opkg-call install *": [
"exec"
],
"/usr/libexec/opkg-call list-available": [
"exec"
],
"/usr/libexec/opkg-call list-installed": [
"exec"
],
"/usr/libexec/opkg-call remove *": [
"exec"
],
"/usr/libexec/opkg-call update *": [
"exec"
],
"/usr/libexec/opkg-list available": [
"exec"
],
"/usr/libexec/opkg-list installed": [
"exec"
],
"/usr/sbin/e2fsck": [
"list"
],
"/usr/sbin/fsck.f2fs": [
"list"
],
"/usr/sbin/fsck.fat": [
"list"
],
"/usr/sbin/ip6tables": [
"list"
],
"/usr/sbin/ip6tables --line-numbers -w -nvxL -t *": [
"exec"
],
"/usr/sbin/ip6tables -Z": [
"exec"
],
"/usr/sbin/ip6tables-save": [
"exec"
],
"/usr/sbin/iptables --line-numbers -w -nvxL -t *": [
"exec"
],
"/usr/sbin/iptables -Z": [
"exec"
],
"/usr/sbin/iptables-save": [
"exec"
],
"/usr/sbin/logread": [
"stat"
],
"/usr/sbin/logread -e ^": [
"exec"
],
"/usr/sbin/nft --terse --json list ruleset": [
"exec"
],
"/www/luci-static/resources/view/status/include": [
"list"
]
},
"ubus": {
"dsl": [
"metrics"
],
"file": [
"read",
"write",
"list",
"remove",
"exec",
"stat"
],
"hostapd.*": [
"del_client",
"wps_start",
"wps_cancel",
"wps_status"
],
"iwinfo": [
"assoclist",
"countrylist",
"freqlist",
"txpowerlist",
"scan",
"info"
],
"luci": [
"getConntrackHelpers",
"getMountPoints",
"getFeatures",
"getSwconfigFeatures",
"getSwconfigPortState",
"getConntrackList",
"getRealtimeStats",
"getProcessList",
"getInitList",
"getLEDs",
"getTimezones",
"getUSBDevices",
"setInitAction",
"setLocaltime",
"setPassword",
"getBlockDevices",
"setBlockDetect"
],
"luci-rpc": [
"getBoardJSON",
"getHostHints",
"getNetworkDevices",
"getWirelessDevices",
"getDHCPLeases",
"getDUIDHints"
],
"network": [
"get_proto_handlers"
],
"network.interface": [
"dump"
],
"network.rrdns": [
"lookup"
],
"session": [
"access",
"login"
],
"system": [
"board",
"info",
"validate_firmware_image",
"reboot"
],
"uci": [
"changes",
"get",
"add",
"apply",
"confirm",
"delete",
"order",
"rename",
"set"
]
},
"uci": {
"dhcp": [
"read",
"write"
],
"dropbear": [
"read",
"write"
],
"firewall": [
"read",
"write"
],
"fstab": [
"read",
"write"
],
"luci": [
"read",
"write"
],
"network": [
"read",
"write"
],
"system": [
"read",
"write"
],
"uhttpd": [
"read",
"write"
],
"wireless": [
"read",
"write"
]
}
},
"data": {
"username": "testuser"
}
}
I have the same answer with root, just
"data": {
"username": "root"
}
and "ubus_rpc_session": "5cb....", are different