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SSL_alert_type_string(3)	    OpenSSL	      SSL_alert_type_string(3)

NAME
       SSL_alert_type_string, SSL_alert_type_string_long,
       SSL_alert_desc_string, SSL_alert_desc_string_long - get textual
       description of alert information

SYNOPSIS
	#include <openssl/ssl.h>

	const char *SSL_alert_type_string(int value);
	const char *SSL_alert_type_string_long(int value);

	const char *SSL_alert_desc_string(int value);
	const char *SSL_alert_desc_string_long(int value);

DESCRIPTION
       SSL_alert_type_string() returns a one letter string indicating the type
       of the alert specified by value.

       SSL_alert_type_string_long() returns a string indicating the type of
       the alert specified by value.

       SSL_alert_desc_string() returns a two letter string as a short form
       describing the reason of the alert specified by value.

       SSL_alert_desc_string_long() returns a string describing the reason of
       the alert specified by value.

NOTES
       When one side of an SSL/TLS communication wants to inform the peer
       about a special situation, it sends an alert. The alert is sent as a
       special message and does not influence the normal data stream (unless
       its contents results in the communication being canceled).

       A warning alert is sent, when a non-fatal error condition occurs. The
       "close notify" alert is sent as a warning alert. Other examples for
       non-fatal errors are certificate errors ("certificate expired", "unsup‐
       ported certificate"), for which a warning alert may be sent.  (The
       sending party may however decide to send a fatal error.) The receiving
       side may cancel the connection on reception of a warning alert on it
       discretion.

       Several alert messages must be sent as fatal alert messages as speci‐
       fied by the TLS RFC. A fatal alert always leads to a connection abort.

RETURN VALUES
       The following strings can occur for SSL_alert_type_string() or
       SSL_alert_type_string_long():

       "W"/"warning"
       "F"/"fatal"
       "U"/"unknown"
	   This indicates that no support is available for this alert type.
	   Probably value does not contain a correct alert message.

       The following strings can occur for SSL_alert_desc_string() or
       SSL_alert_desc_string_long():

       "CN"/"close notify"
	   The connection shall be closed. This is a warning alert.

       "UM"/"unexpected message"
	   An inappropriate message was received. This alert is always fatal
	   and should never be observed in communication between proper imple‐
	   mentations.

       "BM"/"bad record mac"
	   This alert is returned if a record is received with an incorrect
	   MAC. This message is always fatal.

       "DF"/"decompression failure"
	   The decompression function received improper input (e.g. data that
	   would expand to excessive length). This message is always fatal.

       "HF"/"handshake failure"
	   Reception of a handshake_failure alert message indicates that the
	   sender was unable to negotiate an acceptable set of security param‐
	   eters given the options available. This is a fatal error.

       "NC"/"no certificate"
	   A client, that was asked to send a certificate, does not send a
	   certificate (SSLv3 only).

       "BC"/"bad certificate"
	   A certificate was corrupt, contained signatures that did not verify
	   correctly, etc

       "UC"/"unsupported certificate"
	   A certificate was of an unsupported type.

       "CR"/"certificate revoked"
	   A certificate was revoked by its signer.

       "CE"/"certificate expired"
	   A certificate has expired or is not currently valid.

       "CU"/"certificate unknown"
	   Some other (unspecified) issue arose in processing the certificate,
	   rendering it unacceptable.

       "IP"/"illegal parameter"
	   A field in the handshake was out of range or inconsistent with
	   other fields. This is always fatal.

       "DC"/"decryption failed"
	   A TLSCiphertext decrypted in an invalid way: either it wasn't an
	   even multiple of the block length or its padding values, when
	   checked, weren't correct. This message is always fatal.

       "RO"/"record overflow"
	   A TLSCiphertext record was received which had a length more than
	   2^14+2048 bytes, or a record decrypted to a TLSCompressed record
	   with more than 2^14+1024 bytes. This message is always fatal.

       "CA"/"unknown CA"
	   A valid certificate chain or partial chain was received, but the
	   certificate was not accepted because the CA certificate could not
	   be located or couldn't be matched with a known, trusted CA.	This
	   message is always fatal.

       "AD"/"access denied"
	   A valid certificate was received, but when access control was
	   applied, the sender decided not to proceed with negotiation.	 This
	   message is always fatal.

       "DE"/"decode error"
	   A message could not be decoded because some field was out of the
	   specified range or the length of the message was incorrect. This
	   message is always fatal.

       "CY"/"decrypt error"
	   A handshake cryptographic operation failed, including being unable
	   to correctly verify a signature, decrypt a key exchange, or vali‐
	   date a finished message.

       "ER"/"export restriction"
	   A negotiation not in compliance with export restrictions was
	   detected; for example, attempting to transfer a 1024 bit ephemeral
	   RSA key for the RSA_EXPORT handshake method. This message is always
	   fatal.

       "PV"/"protocol version"
	   The protocol version the client has attempted to negotiate is rec‐
	   ognized, but not supported. (For example, old protocol versions
	   might be avoided for security reasons). This message is always
	   fatal.

       "IS"/"insufficient security"
	   Returned instead of handshake_failure when a negotiation has failed
	   specifically because the server requires ciphers more secure than
	   those supported by the client. This message is always fatal.

       "IE"/"internal error"
	   An internal error unrelated to the peer or the correctness of the
	   protocol makes it impossible to continue (such as a memory alloca‐
	   tion failure). This message is always fatal.

       "US"/"user canceled"
	   This handshake is being canceled for some reason unrelated to a
	   protocol failure. If the user cancels an operation after the hand‐
	   shake is complete, just closing the connection by sending a
	   close_notify is more appropriate. This alert should be followed by
	   a close_notify. This message is generally a warning.

       "NR"/"no renegotiation"
	   Sent by the client in response to a hello request or by the server
	   in response to a client hello after initial handshaking.  Either of
	   these would normally lead to renegotiation; when that is not appro‐
	   priate, the recipient should respond with this alert; at that
	   point, the original requester can decide whether to proceed with
	   the connection. One case where this would be appropriate would be
	   where a server has spawned a process to satisfy a request; the
	   process might receive security parameters (key length, authentica‐
	   tion, etc.) at startup and it might be difficult to communicate
	   changes to these parameters after that point. This message is
	   always a warning.

       "UK"/"unknown"
	   This indicates that no description is available for this alert
	   type.  Probably value does not contain a correct alert message.

SEE ALSO
       ssl(3), SSL_CTX_set_info_callback(3)

0.9.7d				  2003-11-20	      SSL_alert_type_string(3)
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