known_hosts.h File Reference

Known hosts management for MITM attack prevention. More...

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Functions
Known Hosts Verification
asciichat_error_t	check_known_host (const char *server_ip, uint16_t port, const uint8_t server_key[32])
	Check if server key is in known_hosts.
asciichat_error_t	check_known_host_with_key (const char *server_ip, uint16_t port, const uint8_t server_key[32], uint8_t expected_key[32], bool *has_expected_key)
asciichat_error_t	check_known_host_no_identity (const char *server_ip, uint16_t port)
	Check known_hosts for servers without identity key (no-identity entries).
Known Hosts Management
asciichat_error_t	add_known_host (const char *server_ip, uint16_t port, const uint8_t server_key[32])
	Add server to known_hosts.
asciichat_error_t	remove_known_host (const char *server_ip, uint16_t port)
	Remove server from known_hosts.
const char *	get_known_hosts_path (void)
	Get the path to the known_hosts file.
User Interaction
bool	display_mitm_warning (const char *server_ip, uint16_t port, const uint8_t expected_key[32], const uint8_t received_key[32])
	Display MITM warning with key comparison and prompt user for confirmation.
bool	prompt_unknown_host (const char *server_ip, uint16_t port, const uint8_t server_key[32])
	Interactive prompt for unknown host - returns true if user wants to add, false to abort.
bool	prompt_unknown_host_no_identity (const char *server_ip, uint16_t port)
	Interactive prompt for unknown host without identity key - returns true if user wants to continue, false to abort.
Key Fingerprinting
void	compute_key_fingerprint (const uint8_t key[32], char fingerprint[(32 *2+1)])
	Compute SHA256 fingerprint of Ed25519 key for display.
Cleanup
void	known_hosts_destroy (void)
	Cleanup function to free cached known_hosts path.

Detailed Description

Known hosts management for MITM attack prevention.

Definition in file known_hosts.h.