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/* This is a proposed C API for support of SASL
*
* Basic Type Summary:
* sasl_conn_t Context for a SASL connection negotiation
* sasl_ssf_t Security layer Strength Factor
* sasl_callback_t A typed client/server callback function and context
* sasl_interact_t A client interaction descriptor
* sasl_secret_t A client authentication secret/credentials/passphrase
* sasl_rand_t Random data context structure
* sasl_security_properties_t An application's required security level
* sasl_external_properties_t Security provided by an external security layer
*
* Callbacks:
* sasl_getopt_t client/server: Get an option value
* sasl_log_t client/server: Log message handler
* sasl_getpath_t client/server: Get path to search for mechanisms
* sasl_getsimple_t client: Get user/language list
* sasl_getsecret_t client: Get authentication secret
* sasl_chalprompt_t client: Display challenge and prompt for response
* sasl_authorize_t server: Authorize policy callback
* sasl_server_getsecret_t server: User secret database read
* sasl_server_putsecret_t server: User secret database write
*
* Client/Server Function Summary:
* sasl_done Release all SASL global state
* sasl_dispose Connection done: Dispose of sasl_conn_t
* sasl_getprop Get property (e.g., user name, security layer info)
* sasl_setprop Set property (e.g., external ssf)
* sasl_usererr Translate server error code to user error code
* sasl_errstring Translate sasl error code to a string
* sasl_encode Encode data to send using security layer
* sasl_decode Decode data received using security layer
*
* Client Function Summary:
* sasl_client_init Load and initialize client plug-ins (call once)
* sasl_client_new Initialize client connection context: sasl_conn_t
* sasl_client_start Select mechanism for connection
* sasl_client_step Perform one authentication step
* sasl_client_auth Create client secret (e.g., from a user & passphrase)
* sasl_free_secret Erase & Dispose of a sasl_secret_t
*
* Server Function Summary
* sasl_server_init Load and initialize server plug-ins (call once)
* sasl_server_new Initialize server connection context: sasl_conn_t
* sasl_listmech Create list of available mechanisms
* sasl_server_start Begin an authentication exchange
* sasl_server_step Perform one authentication exchange step
* sasl_checkpass Check a plaintext passphrase
* sasl_checkapop Check an APOP challenge/response (optional)
* sasl_userexists Check if user exists
* sasl_setpass Change a password or add a user entry
*
* Basic client model:
* 1. client calls sasl_client_init() at startup to load plug-ins
* 2. when connection formed, call sasl_client_new()
* 3. once list of supported mechanisms received from server, client
* calls sasl_client_start(). goto 4a
* 4. client calls sasl_client_step()
* [4a. If SASL_INTERACT, fill in prompts and goto 4
* -- doesn't happen if callbacks provided]
* 4b. If SASL error, goto 7 or 3
* 4c. If SASL_OK, continue or goto 6 if last server response was success
* 5. send message to server, wait for response
* 5a. On data or success with server response, goto 4
* 5b. On failure goto 7 or 3
* 5c. On success with no server response continue
* 6. continue with application protocol until connection closes
* call sasl_getprop/sasl_encode/sasl_decode() if using security layer
* 7. call sasl_dispose(), may return to step 2
* 8. call sasl_done() when program terminates
*
* Basic Server model:
* 1. call sasl_server_init() at startup to load plug-ins
* 2. On connection, call sasl_server_new()
* [3. call sasl_listmech() and send list to client]
* 4. after client AUTH command, call sasl_server_start(), goto 5a
* 5. call sasl_server_step()
* 5a. If SASL_CONTINUE, output to client, wait response, repeat 5
* 5b. If SASL error, then goto 7
* 5c. If SASL_OK, move on
* 6. continue with application protocol until connection closes
* call sasl_getprop/sasl_encode/sasl_decode() if using security layer
* 7. call sasl_dispose(), may return to step 2
* 8. call sasl_done() when program terminates
*
*/
#ifndef SASL_H
#define SASL_H 1
#define SASL_VERSION_MAJOR 1
#define SASL_VERSION_MINOR 5
#define SASL_VERSION_STEP 28
/* The following ifdef block is the standard way of creating macros
* which make exporting from a DLL simpler. All files within this DLL
* are compiled with the LIBSASL_EXPORTS symbol defined on the command
* line. this symbol should not be defined on any project that uses
* this DLL. This way any other project whose source files include
* this file see LIBSASL_API functions as being imported from a DLL,
* wheras this DLL sees symbols defined with this macro as being
* exported. */
/* Under Unix, life is simpler: we just need to mark library functions
* as extern. (Technically, we don't even have to do that.) */
#ifdef WIN32
# ifdef LIBSASL_EXPORTS
# define LIBSASL_API __declspec(dllexport)
# else /* LIBSASL_EXPORTS */
# define LIBSASL_API __declspec(dllimport)
# endif /* LIBSASL_EXPORTS */
#else /* WIN32 */
# define LIBSASL_API extern
#endif /* WIN32 */
/*************
* Basic API *
*************/
/* SASL result codes: */
#define SASL_CONTINUE (1) /* another step is needed in authentication */
#define SASL_OK (0) /* successful result */
#define SASL_FAIL (-1) /* generic failure */
#define SASL_NOMEM (-2) /* memory shortage failure */
#define SASL_BUFOVER (-3) /* overflowed buffer */
#define SASL_NOMECH (-4) /* mechanism not supported */
#define SASL_BADPROT (-5) /* bad protocol / cancel */
#define SASL_NOTDONE (-6) /* can't request info until later in exchange */
#define SASL_BADPARAM (-7) /* invalid parameter supplied */
#define SASL_TRYAGAIN (-8) /* transient failure (e.g., weak key) */
#define SASL_BADMAC (-9) /* integrity check failed */
/* -- client only codes -- */
#define SASL_INTERACT (2) /* needs user interaction */
#define SASL_BADSERV (-10) /* server failed mutual authentication step */
#define SASL_WRONGMECH (-11) /* mechanism doesn't support requested feature */
#define SASL_NEWSECRET (-12) /* new secret needed */
/* -- server only codes -- */
#define SASL_BADAUTH (-13) /* authentication failure */
#define SASL_NOAUTHZ (-14) /* authorization failure */
#define SASL_TOOWEAK (-15) /* mechanism too weak for this user */
#define SASL_ENCRYPT (-16) /* encryption needed to use mechanism */
#define SASL_TRANS (-17) /* One time use of a plaintext password will
enable requested mechanism for user */
#define SASL_EXPIRED (-18) /* passphrase expired, has to be reset */
#define SASL_DISABLED (-19) /* account disabled */
#define SASL_NOUSER (-20) /* user not found */
#define SASL_PWLOCK (-21) /* password locked */
#define SASL_NOCHANGE (-22) /* requested change was not needed */
#define SASL_BADVERS (-23) /* version mismatch with plug-in */
#define SASL_NOPATH (-25) /* path not set */
/* max size of a sasl mechanism name */
#define SASL_MECHNAMEMAX 20
/* per-connection SASL negotiation state for client or server
*/
typedef struct sasl_conn sasl_conn_t;
/* opaque passphrase/secret kept encrypted by API middleware
* can be used by caller for single sign-on
* client "KEY" option will be used as key for
* clients which offer a save-to-disk option.
*/
typedef struct sasl_secret {
unsigned long len;
char data[1]; /* variable sized */
} sasl_secret_t;
/* random data context structure
*/
typedef struct sasl_rand_s sasl_rand_t;
/****************************
* Configure Basic Services *
****************************/
/* the following functions are used to adjust how allocation and mutexes work
* they must be called before all other SASL functions:
*/
/* memory allocation functions which may optionally be replaced:
*/
typedef void *sasl_malloc_t(unsigned long);
typedef void *sasl_calloc_t(unsigned long, unsigned long);
typedef void *sasl_realloc_t(void *, unsigned long);
typedef void sasl_free_t(void *);
LIBSASL_API void sasl_set_alloc(sasl_malloc_t *,
sasl_calloc_t *,
sasl_realloc_t *,
sasl_free_t *);
/* mutex functions which may optionally be replaced:
* sasl_mutex_new allocates a mutex structure
* sasl_mutex_lock blocks until mutex locked
* returns SASL_FAIL on deadlock or parameter error
* returns SASL_OK on success
* sasl_mutex_unlock unlocks mutex if it's locked
* returns SASL_FAIL if not locked or parameter error
* returns SASL_OK on success
*/
typedef void *sasl_mutex_new_t();
typedef int sasl_mutex_lock_t(void *mutex);
typedef int sasl_mutex_unlock_t(void *mutex);
typedef void sasl_mutex_dispose_t(void *mutex);
LIBSASL_API void sasl_set_mutex(sasl_mutex_new_t *, sasl_mutex_lock_t *,
sasl_mutex_unlock_t *, sasl_mutex_dispose_t *);
/*****************************
* Security preference types *
*****************************/
/* security layer strength factor -- an unsigned integer usable by the caller
* to specify approximate security layer strength desired. Roughly
* correlated to effective key length for encryption.
* 0 = no protection
* 1 = integrity protection only
* 40 = 40-bit DES or 40-bit RC2/RC4
* 56 = DES
* 112 = triple-DES
* 128 = 128-bit RC2/RC4/BLOWFISH
*/
typedef unsigned sasl_ssf_t;
/* secflags provided on sasl_server_new and sasl_client_new:
*/
#define SASL_SECURITY_LAYER (0x0001) /* caller supports security layer */
/***************************
* Security Property Types *
***************************/
/* Structure specifying the client or server's security policy
* and optional additional properties.
*/
/* These are the various security flags apps can specify. */
/* NOPLAINTEXT -- don't permit mechanisms susceptible to simple
* passive attack (e.g., PLAIN, LOGIN)
* NOACTIVE -- protection from active (non-dictionary) attacks
* during authentication exchange.
* Authenticates server.
* NODICTIONARY -- don't permit mechanisms susceptible to passive
* dictionary attack
* FORWARD_SECRECY -- require forward secrecy between sessions
* (breaking one won't help break next)
* NOANONYMOUS -- don't permit mechanisms that allow anonymous login
* PASS_CREDENTIALS -- require mechanisms which pass client
* credentials, and allow mechanisms which can pass
* credentials to do so
*/
#define SASL_SEC_NOPLAINTEXT (0x0001)
#define SASL_SEC_NOACTIVE (0x0002)
#define SASL_SEC_NODICTIONARY (0x0004)
#define SASL_SEC_FORWARD_SECRECY (0x0008)
#define SASL_SEC_NOANONYMOUS (0x0010)
#define SASL_SEC_PASS_CREDENTIALS (0x0200)
typedef struct sasl_security_properties
{
/* security strength factor
* min_ssf = minimum acceptable final level
* max_ssf = maximum acceptable final level
*/
sasl_ssf_t min_ssf;
sasl_ssf_t max_ssf;
/* Maximum security layer receive buffer size.
* 0=security layer not supported
*/
unsigned maxbufsize;
/* bitfield for security properties -- see SASL_SEC_* above */
int security_flags;
/* NULL terminated array of additional property names, values */
const char **property_names;
const char **property_values;
} sasl_security_properties_t;
/* Structure communicating the characteristics of an external security
* mechanism. This is used with sasl_setprop() to inform the library
* of an active external security layer. If the auth_id is non-NULL,
* this enables the EXTERNAL authentication mechanism; this may also
* allow other mechanisms to become active (for instance, if an
* application demands encryption, mechanisms which solely provide
* authentication might become active if the necessary encryption is
* provided external to SASL). Since this potentially changes the
* list of supported mechanisms, the mechanism list should be re-sent,
* if it has been sent already. */
typedef struct sasl_external_properties
{
/* security provided by the external mechanism */
sasl_ssf_t ssf;
/* authorization identity provided by the external mechanism */
char *auth_id;
} sasl_external_properties_t;
/******************
* Callback types *
******************/
/* Extensible type for a client/server callbacks
* id -- identifies callback type
* proc -- procedure call arguments vary based on id
* context -- context passed to procedure
*/
typedef struct sasl_callback {
/* Identifies the type of the callback function.
* Mechanisms must ignore callbacks with id's they don't recognize.
*/
unsigned long id;
int (*proc)(); /* Callback function. Types of arguments vary by 'id' */
void *context;
} sasl_callback_t;
/* callback ids & functions:
*/
#define SASL_CB_LIST_END (0) /* end of list */
/* option reading callback -- this allows a SASL configuration to be
* encapsulated in the caller's configuration system. Some implementations
* may use default config file(s) if this is omitted. Configuration items
* may be plugin-specific and are arbitrary strings.
*
* inputs:
* context -- option context from callback record
* plugin_name -- name of plugin (NULL = general SASL option)
* option -- name of option
* output:
* result -- set to result which persists until next getopt in
* same thread, unchanged if option not found
* len -- length of result (optional)
* returns:
* SASL_OK -- no error
* SASL_FAIL -- error
*/
typedef int sasl_getopt_t(void *context, const char *plugin_name,
const char *option,
const char **result, unsigned *len);
#define SASL_CB_GETOPT (1)
/* Logging levels for use with the logging callback function. */
#define SASL_LOG_ERR (1) /* error message */
#define SASL_LOG_WARNING (2) /* warning message */
#define SASL_LOG_INFO (3) /* normal message */
/* logging callback -- this allows plugins and the middleware to
* log operations they perform.
* inputs:
* context -- logging context from the callback record
* priority -- logging priority; see above
* message -- message to log
* returns:
* SASL_OK -- no error
* SASL_FAIL -- error
*/
typedef int sasl_log_t(void *context,
int priority,
const char *message);
#define SASL_CB_LOG (2)
/* getpath callback -- this allows applications to specify the
* colon-separated path to search for plugins (by default,
* taken from the SASL_PATH environment variable).
* inputs:
* context -- getpath context from the callback record
* outputs:
* path -- colon seperated path (allocated on the heap; the
* library will free it using the sasl_free_t *
* passed to sasl_set_alloc(), or the standard free()
* library call).
* returns:
* SASL_OK -- no error
* SASL_FAIL -- error
*/
typedef int sasl_getpath_t(void * context,
char ** path);
#define SASL_CB_GETPATH (3)
/* verify file callback -- this allows applications to check if they
* want SASL to use files, file by file. This is intended to allow
* applications to sanity check the environment to make sure plugins
* or the configuration file can't be written to, etc.
* inputs:
* context -- verifypath context from the callback record
* file -- full path to file to verify
* type -- type of file to verify
* returns:
* SASL_OK -- no error (file can safely be used)
* SASL_CONTINUE -- continue WITHOUT using this file
* SASL_FAIL -- error
*/
typedef int sasl_verifyfile_t(void * context,
const char * file, const int type);
#define SASL_CB_VERIFYFILE (4)
/* these are the types of files libsasl will ask about */
#define SASL_VRFY_PLUGIN (1)
#define SASL_VRFY_CONF (2)
#define SASL_VRFY_PASSWD (3)
#define SASL_VRFY_OTHER (4)
/* client/user interaction callbacks:
*/
/* Simple prompt -- result must persist until next call to getsimple or
* until connection context is disposed
* inputs:
* context -- context from callback structure
* id -- callback id
* outputs:
* result -- set to NUL terminated string
* NULL = user cancel
* len -- length of result, ignored with SASL_CB_SECRET
* returns SASL_OK
*/
typedef int sasl_getsimple_t(void *context, int id,
const char **result, unsigned *len);
#define SASL_CB_USER (0x4001) /* client user identity to login as */
#define SASL_CB_AUTHNAME (0x4002) /* client authentication name,
* defaults to authid in sasl_secret_t */
#define SASL_CB_LANGUAGE (0x4003) /* comma separated list of RFC 1766
* language codes in order of preference
* to be used to localize client prompts
* or server error codes */
/* get a sasl_secret_t
* psecret -- may be left NULL if sasl_client_auth() called
* returns SASL_OK
*/
typedef int sasl_getsecret_t(sasl_conn_t *conn, void *context, int id,
sasl_secret_t **psecret);
#define SASL_CB_PASS (0x4004) /* client passphrase-based secret */
/* prompt for input in response to a challenge, result is copied & erased
* by caller.
* input:
* context -- context from callback structure
* id -- callback id
* challenge -- server challenge
* output:
* result -- NUL terminated result, NULL = user cancel
* len -- length of result
* returns SASL_OK
*/
typedef int sasl_chalprompt_t(void *context, int id,
const char *challenge,
const char *prompt, const char *defresult,
const char **result, unsigned *len);
#define SASL_CB_ECHOPROMPT (0x4005) /* challenge and client-entered result */
#define SASL_CB_NOECHOPROMPT (0x4006) /* challenge and client-entered result */
/* prompt (or autoselect) the realm to do authentication in.
* may get a list of valid realms.
* input:
* context -- context from callback structure
* id -- callback id
* availrealms -- available realms; string list; NULL terminated
* output:
* result -- NUL terminated realm; NULL is equivalent to ""
* returns SASL_OK
* result must persist until the next callback
*/
/* If there is an interaction with SASL_CB_GETREALM the challenge of
* the sasl_interact_t will be of the format: {realm1, realm2,
* ...}. That is a list of possible realms seperated by comma spaces
* enclosed by brackets.
*/
typedef int sasl_getrealm_t(void *context, int id,
const char **availrealms,
const char **result);
#define SASL_CB_GETREALM (0x4007) /* realm to attempt authentication in */
/* server callbacks:
*/
/* callback to verify authorization
* requested_user -- the identity/username to authorize
* auth_identity -- the identity associated with the secret
* if the identity is not in the realm specified in
* sasl_server_new, it will be of the form user@realm
* return:
* user -- NULL = requested_user, otherwise canonicalized
* errstr -- can be set to error string on failure
* returns SASL_OK on success, SASL_BADAUTH or other SASL response on failure
*/
typedef int sasl_authorize_t(void *context,
const char *auth_identity,
const char *requested_user,
const char **user,
const char **errstr);
#define SASL_CB_PROXY_POLICY (0x8001)
/* callback to lookup a user's secret for a mechanism
* mechanism -- the mechanism requesting its secret
* auth_identity -- the identity being looked up
* realm -- the realm the identity is in
* return:
* secret -- the secret associated with this user
* for this mechanism
* returns SASL_OK on success or other SASL response on failure
*/
typedef int sasl_server_getsecret_t(void *context,
const char *mechanism,
const char *auth_identity,
const char *realm,
sasl_secret_t ** secret);
#define SASL_CB_SERVER_GETSECRET (0x8002)
/* callback to store a user's secret for a mechanism
* mechanism -- the mechanism storing its secret
* auth_identity -- the identity being stored
* realm -- the realm the identity is in
* secret -- the secret associated with this user
* for this mechanism. If NULL, user's secret
* for this mechanism will be erased.
* returns SASL_OK on success or other SASL response on failure
*/
typedef int sasl_server_putsecret_t(void *context,
const char *mechanism,
const char *auth_identity,
const char *realm,
const sasl_secret_t * secret);
#define SASL_CB_SERVER_PUTSECRET (0x8003)
/**********************************
* Common Client/server functions *
**********************************/
/* dispose of all SASL plugins. Connection
* states have to be disposed of before calling this.
*/
LIBSASL_API void sasl_done(void);
/* dispose connection state, sets it to NULL
* checks for pointer to NULL
*/
LIBSASL_API void sasl_dispose(sasl_conn_t **pconn);
/* translate server error code to user error code
* currently only maps SASL_NOUSER to SASL_BADAUTH
*/
LIBSASL_API int sasl_usererr(int saslerr);
/* translate an error number into a string
* input:
* saslerr -- the error number
* langlist -- comma separated list of RFC 1766 languages (may be NULL)
* results:
* outlang -- the language actually used (may be NULL if don't care)
* returns:
* the error message
*/
LIBSASL_API const char *sasl_errstring(int saslerr,
const char *langlist,
const char **outlang);
/* get property from SASL connection state
* propnum -- property number
* pvalue -- pointer to value
* returns:
* SASL_OK -- no error
* SASL_NOTDONE -- property not available yet
* SASL_BADPARAM -- bad property number
*/
LIBSASL_API int sasl_getprop(sasl_conn_t *conn, int propnum, void **pvalue);
#define SASL_USERNAME 0 /* pointer to NUL terminated user name */
#define SASL_SSF 1 /* security layer security strength factor,
* if 0, call to sasl_encode, sasl_decode
* unnecessary */
#define SASL_MAXOUTBUF 2 /* security layer max output buf unsigned */
#define SASL_REALM 3 /* server authentication realm used */
#define SASL_GETOPTCTX 4 /* context for getopt callback */
#define SASL_IP_LOCAL 5 /* local address (pvalue=sockaddr_in *) */
#define SASL_IP_REMOTE 6 /* remote address (pvalue=sockaddr_in *) */
/* set property in SASL connection state
* returns:
* SASL_OK -- value set
* SASL_BADPARAM -- invalid property or value
*/
LIBSASL_API int sasl_setprop(sasl_conn_t *conn,
int propnum,
const void *value);
#define SASL_SSF_EXTERNAL 100 /* external SSF active --
* sasl_external_properties_t */
#define SASL_SEC_PROPS 101 /* sasl_security_properties_t */
/* also allows SASL_IP_LOCAL, SASL_IP_REMOTE */
/* do precalculations during an idle period or network round trip
* may pass NULL to precompute for some mechanisms prior to connect
* returns 1 if action taken, 0 if no action taken
*/
LIBSASL_API int sasl_idle(sasl_conn_t *conn);
/**************
* Client API *
**************/
/* list of client interactions with user for caller to fill in
*/
typedef struct sasl_interact {
unsigned long id; /* same as client/user callback ID */
const char *challenge; /* may be computer readable */
const char *prompt; /* always human readable */
const char *defresult; /* default result string */
void *result; /* set to point to result -- this will
* be freed by the library iff it
* would be freed by the library if
* returned from normal callback of
* the same id */
unsigned len; /* set to length of result */
} sasl_interact_t;
/* initialize the SASL client drivers
* callbacks -- base callbacks for all client connections
* returns:
* SASL_OK -- Success
* SASL_NOMEM -- Not enough memory
* SASL_BADVERS -- Mechanism version mismatch
* SASL_BADPARAM -- error in config file
* SASL_NOMECH -- No mechanisms available
* ...
*/
LIBSASL_API int sasl_client_init(const sasl_callback_t *callbacks);
/* initialize a client exchange based on the specified mechanism
* service -- registered name of the service using SASL (e.g. "imap")
* serverFQDN -- the fully qualified domain name of the server
* prompt_supp -- list of client interactions supported
* may also include sasl_getopt_t context & call
* NULL prompt_supp = user/pass via SASL_INTERACT only
* NULL proc = interaction supported via SASL_INTERACT
* secflags -- security flags (see above)
* in/out:
* pconn -- connection negotiation structure
* pointer to NULL => allocate new
*
* Returns:
* SASL_OK -- success
* SASL_NOMECH -- no mechanism meets requested properties
* SASL_NOMEM -- not enough memory
*/
LIBSASL_API int sasl_client_new(const char *service,
const char *serverFQDN,
const sasl_callback_t *prompt_supp,
int secflags,
sasl_conn_t **pconn);
/* select a mechanism for a connection
* mechlist -- mechanisms server has available (punctuation ignored)
* secret -- optional secret from previous session
* output:
* prompt_need -- on SASL_INTERACT, list of prompts needed to continue
* clientout -- the initial client response to send to the server
* mech -- set to mechanism name
*
* Returns:
* SASL_OK -- success
* SASL_NOMEM -- not enough memory
* SASL_NOMECH -- no mechanism meets requested properties
* SASL_INTERACT -- user interaction needed to fill in prompt_need list
*/
LIBSASL_API int sasl_client_start(sasl_conn_t *conn,
const char *mechlist,
sasl_secret_t *secret,
sasl_interact_t **prompt_need,
char **clientout,
unsigned *clientoutlen,
const char **mech);
/* do a single authentication step.
* serverin -- the server message received by the client, MUST have a NUL
* sentinel, not counted by serverinlen
* output:
* prompt_need -- on SASL_INTERACT, list of prompts needed to continue
* clientout -- the client response to send to the server
*
* returns:
* SASL_OK -- success
* SASL_INTERACT -- user interaction needed to fill in prompt_need list
* SASL_BADPROT -- server protocol incorrect/cancelled
* SASL_BADSERV -- server failed mutual auth
*/
LIBSASL_API int
sasl_client_step(sasl_conn_t *conn,
const char *serverin,
unsigned serverinlen,
sasl_interact_t **prompt_need,
char **clientout,
unsigned *clientoutlen);
/* Set connection secret based on passphrase
* may be used in SASL_CB_PASS callback
* input:
* user -- username
* pass -- plaintext passphrase with NUL sentinel
* passlen -- 0 = strlen(pass)
* out:
* prompts -- if non-NULL, SASL_CB_PASS item filled in
* keepcopy -- set to copy of secret if non-NULL
* returns:
* SASL_OK -- success
* SASL_NOMEM -- failure
*/
LIBSASL_API int
sasl_client_auth(sasl_conn_t *conn,
const char *user,
const char *pass, unsigned passlen,
sasl_interact_t *prompts, sasl_secret_t **keepcopy);
/* erase & dispose of a sasl_secret_t
* calls free utility last set by sasl_set_alloc
*/
LIBSASL_API void sasl_free_secret(sasl_secret_t **);
/**************
* Server API *
**************/
/* initialize server drivers, done once per process
* callbacks -- base callbacks for all server connections
* appname -- name of calling application (for lower level logging)
* results:
* state -- server state
* returns:
* SASL_OK -- success
* SASL_BADPARAM -- error in config file
* SASL_NOMEM -- memory failure
* SASL_BADVERS -- Mechanism version mismatch
*/
LIBSASL_API int sasl_server_init(const sasl_callback_t *callbacks,
const char *appname);
/* create context for a single SASL connection
* service -- registered name of the service using SASL (e.g. "imap")
* serverFQDN -- Fully qualified server domain name. NULL means use
* gethostname(). Useful for multi-homed servers.
* user_realm -- permits multiple user domains on server, NULL = default
* callbacks -- callbacks (e.g., authorization, lang, new getopt context)
* secflags -- security flags (see above)
* returns:
* pconn -- new connection context
*
* returns:
* SASL_OK -- success
* SASL_NOMEM -- not enough memory
*/
LIBSASL_API int sasl_server_new(const char *service,
const char *serverFQDN,
const char *user_realm,
const sasl_callback_t *callbacks,
int secflags,
sasl_conn_t **pconn);
/* This returns a list of mechanisms in a NUL-terminated string
* user -- restricts mechanisms to those available to that user
* (may be NULL)
* prefix -- appended to beginning of result
* sep -- appended between mechanisms
* suffix -- appended to end of result
* results:
* result -- NUL terminated allocated result, caller must free
* plen -- gets length of result (excluding NUL), may be NULL
* pcount -- gets number of mechanisms, may be NULL
*
* returns:
* SASL_OK -- success
* SASL_NOMEM -- not enough memory
* SASL_NOMECH -- no enabled mechanisms
*/
LIBSASL_API int sasl_listmech(sasl_conn_t *conn,
const char *user,
const char *prefix,
const char *sep,
const char *suffix,
char **result,
unsigned *plen,
unsigned *pcount);
/* start a mechanism exchange within a connection context
* mech -- the mechanism name client requested
* clientin -- client initial response, NULL if empty
* clientinlen -- length of initial response
* serverout -- initial server challenge, NULL if done
* serveroutlen -- length of initial server challenge
* output:
* pconn -- the connection negotiation state on success
* errstr -- set to string to send to user on failure
*
* Same returns as sasl_server_step()
*/
LIBSASL_API int sasl_server_start(sasl_conn_t *conn,
const char *mech,
const char *clientin,
unsigned clientinlen,
char **serverout,
unsigned *serveroutlen,
const char **errstr);
/* perform one step of the SASL exchange
* inputlen & input -- client data
* NULL on first step if no optional client step
* outputlen & output -- set to the server data to transmit
* to the client in the next step
* errstr -- set to a more text error message from
* a lower level mechanism on failure
*
* returns:
* SASL_OK -- exchange is complete.
* SASL_CONTINUE -- indicates another step is necessary.
* SASL_TRANS -- entry for user exists, but not for mechanism
* and transition is possible
* SASL_BADPARAM -- service name needed
* SASL_BADPROT -- invalid input from client
* ...
*/
LIBSASL_API int sasl_server_step(sasl_conn_t *conn,
const char *clientin,
unsigned clientinlen,
char **serverout,
unsigned *serveroutlen,
const char **errstr);
/* check if a plaintext password is valid
* if user is NULL, check if plaintext is enabled
* inputs:
* user -- user to query in current user_realm
* userlen -- length of username, 0 = strlen(user)
* pass -- plaintext password to check
* passlen -- length of password, 0 = strlen(pass)
* outputs:
* errstr -- set to error message for use in protocols
* returns
* SASL_OK -- success
* SASL_NOMECH -- user found, but no verifier
* SASL_NOUSER -- user not found
*/
LIBSASL_API int sasl_checkpass(sasl_conn_t *conn,
const char *user,
unsigned userlen,
const char *pass,
unsigned passlen,
const char **errstr);
/* check if a user exists on server
* service -- registered name of the service using SASL (e.g. "imap")
* user_realm -- permits multiple user domains on server, NULL = default
* user -- NUL terminated user name
*
* returns:
* SASL_OK -- success
* SASL_DISABLED -- account disabled
* SASL_NOUSER -- user not found
* SASL_NOMECH -- user found, but no usable mechanism
*/
LIBSASL_API int sasl_user_exists(const char *service,
const char *user_realm,
const char *user);
/* check if an APOP exchange is valid
* (note this is an optional part of the SASL API)
* inputs:
* user -- user to query in current user_realm
* userlen -- length of username, 0 = strlen(user)
* challenge -- challenge which was sent to client
* challen -- length of challenge, 0 = strlen(challenge)
* response -- client response string: "32HEXDIGIT"
* resplen -- length of response, 0 = strlen(response)
* outputs:
* errstr -- set to error message for use in protocols
* returns
* SASL_OK -- success
* SASL_FAIL -- failure
* SASL_BADPARAM -- invalid parameter
* SASL_BADAUTH -- authentication failed
* SASL_NOUSER -- user not found
*/
LIBSASL_API int sasl_checkapop(sasl_conn_t *conn,
const char *user,
unsigned userlen,
const char *challenge,
unsigned challen,
const char *response,
unsigned resplen,
const char **errstr);
/* set the password for a user
* conn -- SASL connection
* user -- user name
* pass -- plaintext password, may be NULL to remove user
* passlen -- length of password, 0 = strlen(pass)
* flags -- see flags below
* errstr -- optional more detailed error
*
* returns:
* SASL_NOCHANGE -- proper entry already exists
* SASL_NOMECH -- no authdb supports password setting as configured
* SASL_DISABLED -- account disabled
* SASL_PWLOCK -- password locked
* SASL_FAIL -- OS error
* SASL_BADPARAM -- password too long
* SASL_OK -- successful
*/
LIBSASL_API int sasl_setpass(sasl_conn_t *conn,
const char *user,
const char *pass,
unsigned passlen,
int flags,
const char **errstr);
#define SASL_SET_CREATE 0x01 /* create a new entry for user */
#define SASL_SET_DISABLE 0x02 /* disable user account */
/**********************
* security layer API *
**********************/
/* encode a block of data for transmission using security layer
* returns:
* SASL_OK -- success (returns input if no layer negotiated)
* SASL_NOTDONE -- security layer negotiation not finished
*/
LIBSASL_API int sasl_encode(sasl_conn_t *conn,
const char *input, unsigned inputlen,
char **output, unsigned *outputlen);
/* decode a block of data received using security layer
* returns:
* SASL_OK -- success (returns input if no layer negotiated)
* SASL_NOTDONE -- security layer negotiation not finished
*/
LIBSASL_API int sasl_decode(sasl_conn_t *conn,
const char *input, unsigned inputlen,
char **output, unsigned *outputlen);
/************************************
* Credentials API (used by server) *
************************************/
/* install credentials passed by the client
* Installing a set of credentials may install them on a per-process
* or a per-thread basis; neither behavior may be assumed.
* returns:
* SASL_OK -- success
* SASL_FAIL -- failure
* SASL_NOTDONE -- credentials not passed
*/
LIBSASL_API int sasl_cred_install(sasl_conn_t *conn);
/* uninstalls a connection's credentials
* returns:
* SASL_OK -- success
* SASL_FAIL -- failure
*/
LIBSASL_API int sasl_cred_uninstall(sasl_conn_t *conn);
#endif /* SASL_H */