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- /* This is a proposed C API for support of SASL
- *
- *********************************IMPORTANT*******************************
- * send email to chris.newman@innosoft.com and cyrus-bugs@andrew.cmu.edu *
- * if you need to add new error codes, callback types, property values, *
- * etc. It is important to keep the multiple implementations of this *
- * API from diverging. *
- *********************************IMPORTANT*******************************
- *
- * 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 password
- * sasl_rand_t Random data context structure
- * sasl_security_properties_t An application's required security level
- *
- * Callbacks:
- * sasl_getopt_t client/server: Get an option value
- * sasl_logmsg_t client/server: Log message handler
- * 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
- *
- * Server only Callbacks:
- * sasl_authorize_t user authorization policy callback
- * sasl_getconfpath_t get path to search for config file
- * sasl_server_userdb_checkpass check password and auxprops in userdb
- * sasl_server_userdb_setpass set password in userdb
- * sasl_server_canon_user canonicalize username routine
- *
- * 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_errdetail Generate string from last error on connection
- * 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
- *
- * Utility functions:
- * sasl_encode64 Encode data to send using MIME base64 encoding
- * sasl_decode64 Decode data received using MIME base64 encoding
- * sasl_erasebuffer Erase a buffer
- *
- * 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
- *
- * 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 (uses pseudo "APOP"
- * mechanism similar to CRAM-MD5 mechanism; optional)
- * sasl_user_exists Check if user exists
- * sasl_setpass Change a password or add a user entry
- * sasl_auxprop_request Request auxiliary properties
- * sasl_auxprop_getctx Get auxiliary property context for connection
- * sasl_auxprop_store Store a set of auxiliary properties
- *
- * 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 to get username
- * 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
- *
- *************************************************
- * IMPORTANT NOTE: server realms / username syntax
- *
- * If a user name contains a "@", then the rightmost "@" in the user name
- * separates the account name from the realm in which this account is
- * located. A single server may support multiple realms. If the
- * server knows the realm at connection creation time (e.g., a server
- * with multiple IP addresses tightly binds one address to a specific
- * realm) then that realm must be passed in the user_realm field of
- * the sasl_server_new call. If user_realm is non-empty and an
- * unqualified user name is supplied, then the canon_user facility is
- * expected to append "@" and user_realm to the user name. The canon_user
- * facility may treat other characters such as "%" as equivalent to "@".
- *
- * If the server forbids the use of "@" in user names for other
- * purposes, this simplifies security validation.
- */
-
- #ifndef SASL_H
- #define SASL_H 1
-
- /* Keep in sync with win32/common.mak */
- #define SASL_VERSION_MAJOR 2
- #define SASL_VERSION_MINOR 1
- #define SASL_VERSION_STEP 22
-
- /* A convenience macro: same as was defined in the OpenLDAP LDAPDB */
- #define SASL_VERSION_FULL ((SASL_VERSION_MAJOR << 16) |\
- (SASL_VERSION_MINOR << 8) | SASL_VERSION_STEP)
-
- #include "prop.h"
-
- /*************
- * 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 */
- #define SASL_NOTINIT -12 /* SASL library not initialized */
- /* -- 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 */
- /* -- 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_BADVERS -23 /* version mismatch with plug-in */
- #define SASL_UNAVAIL -24 /* remote authentication server unavailable */
- #define SASL_NOVERIFY -26 /* user exists, but no verifier for user */
- /* -- codes for password setting -- */
- #define SASL_PWLOCK -21 /* passphrase locked */
- #define SASL_NOCHANGE -22 /* requested change was not needed */
- #define SASL_WEAKPASS -27 /* passphrase is too weak for security policy */
- #define SASL_NOUSERPASS -28 /* user supplied passwords not permitted */
-
- /* max size of a sasl mechanism name */
- #define SASL_MECHNAMEMAX 20
-
- #ifdef _WIN32
- /* Define to have the same layout as a WSABUF */
- #ifndef STRUCT_IOVEC_DEFINED
- #define STRUCT_IOVEC_DEFINED 1
- struct iovec {
- long iov_len;
- char *iov_base;
- };
- #endif
- #else
- struct iovec; /* Defined in OS headers */
- #endif
-
-
- /* per-connection SASL negotiation state for client or server
- */
- typedef struct sasl_conn sasl_conn_t;
-
- /* Plain text password structure.
- * len is the length of the password, data is the text.
- */
- typedef struct sasl_secret {
- unsigned long len;
- unsigned char data[1]; /* variable sized */
- } sasl_secret_t;
-
- /* random data context structure
- */
- typedef struct sasl_rand_s sasl_rand_t;
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- /****************************
- * 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_alloc allocates a mutex structure
- * sasl_mutex_lock blocks until mutex locked
- * returns -1 on deadlock or parameter error
- * returns 0 on success
- * sasl_mutex_unlock unlocks mutex if it's locked
- * returns -1 if not locked or parameter error
- * returns 0 on success
- * sasl_mutex_free frees a mutex structure
- */
- typedef void *sasl_mutex_alloc_t(void);
- typedef int sasl_mutex_lock_t(void *mutex);
- typedef int sasl_mutex_unlock_t(void *mutex);
- typedef void sasl_mutex_free_t(void *mutex);
- LIBSASL_API void sasl_set_mutex(sasl_mutex_alloc_t *, sasl_mutex_lock_t *,
- sasl_mutex_unlock_t *, sasl_mutex_free_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
- * 256 = baseline AES
- */
- typedef unsigned sasl_ssf_t;
-
- /* usage flags provided to sasl_server_new and sasl_client_new:
- */
- #define SASL_SUCCESS_DATA 0x0004 /* server supports data on success */
- #define SASL_NEED_PROXY 0x0008 /* require a mech that allows proxying */
-
- /***************************
- * 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
- * MUTUAL_AUTH -- require mechanisms which provide mutual
- * authentication
- */
- #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 0x0020
- #define SASL_SEC_MUTUAL_AUTH 0x0040
- #define SASL_SEC_MAXIMUM 0x00FF
-
- 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 attacks to protect against */
- unsigned security_flags;
-
- /* NULL terminated array of additional property names, values */
- const char **property_names;
- const char **property_values;
- } sasl_security_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
- */
- /* Note that any memory that is allocated by the callback needs to be
- * freed by the application, be it via function call or interaction.
- *
- * It may be freed after sasl_*_step returns SASL_OK. if the mechanism
- * requires this information to persist (for a security layer, for example)
- * it must maintain a private copy.
- */
- 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 (may be NULL)
- * 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_NONE 0 /* don't log anything */
- #define SASL_LOG_ERR 1 /* log unusual errors (default) */
- #define SASL_LOG_FAIL 2 /* log all authentication failures */
- #define SASL_LOG_WARN 3 /* log non-fatal warnings */
- #define SASL_LOG_NOTE 4 /* more verbose than LOG_WARN */
- #define SASL_LOG_DEBUG 5 /* more verbose than LOG_NOTE */
- #define SASL_LOG_TRACE 6 /* traces of internal protocols */
- #define SASL_LOG_PASS 7 /* traces of internal protocols, including
- * passwords */
-
- /* logging callback -- this allows plugins and the middleware to
- * log operations they perform.
- * inputs:
- * context -- logging context from the callback record
- * level -- logging level; see above
- * message -- message to log
- * returns:
- * SASL_OK -- no error
- * SASL_FAIL -- error
- */
- typedef int sasl_log_t(void *context,
- int level,
- 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 an implementation-specific location).
- * inputs:
- * context -- getpath context from the callback record
- * outputs:
- * path -- colon seperated path
- * returns:
- * SASL_OK -- no error
- * SASL_FAIL -- error
- */
- typedef int sasl_getpath_t(void *context,
- const 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 (see below)
-
- * returns:
- * SASL_OK -- no error (file can safely be used)
- * SASL_CONTINUE -- continue WITHOUT using this file
- * SASL_FAIL -- error
- */
-
- /* these are the types of files libsasl will ask about */
- typedef enum {
- SASL_VRFY_PLUGIN=0, /* a DLL/shared library plug-in */
- SASL_VRFY_CONF=1, /* a configuration file */
- SASL_VRFY_PASSWD=2, /* a password storage file/db */
- SASL_VRFY_OTHER=3 /* some other file */
- } sasl_verify_type_t;
-
- typedef int sasl_verifyfile_t(void *context,
- const char *file, sasl_verify_type_t type);
- #define SASL_CB_VERIFYFILE 4
-
- /* getconfpath callback -- this allows applications to specify the
- * colon-separated path to search for config files (by default,
- * taken from the SASL_CONF_PATH environment variable).
- * inputs:
- * context -- getconfpath 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_callback, or the standard free()
- * library call).
- * returns:
- * SASL_OK -- no error
- * SASL_FAIL -- error
- */
- typedef int sasl_getconfpath_t(void *context,
- char **path);
-
- #define SASL_CB_GETCONFPATH 5
-
- /* client/user interaction callbacks:
- */
- /* Simple prompt -- result must persist until next call to getsimple on
- * same connection 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
- * 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 */
- #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 */
- #define SASL_CB_CNONCE 0x4007 /* caller supplies client-nonce
- * primarily for testing purposes */
-
- /* get a sasl_secret_t (plaintext password with length)
- * inputs:
- * conn -- connection context
- * context -- context from callback structure
- * id -- callback id
- * outputs:
- * psecret -- set to NULL to cancel
- * set to password structure which must persist until
- * next call to getsecret in same connection, but middleware
- * will erase password data when it's done with it.
- * 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.
- * 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 enterred result */
- #define SASL_CB_NOECHOPROMPT 0x4006 /* challenge and client enterred 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
- * list may be empty.
- * output:
- * result -- NUL terminated realm; NULL is equivalent to ""
- * returns SASL_OK
- * result must persist until the next callback
- */
- typedef int sasl_getrealm_t(void *context, int id,
- const char **availrealms,
- const char **result);
- #define SASL_CB_GETREALM (0x4008) /* realm to attempt authentication in */
-
- /* server callbacks:
- */
-
- /* improved callback to verify authorization;
- * canonicalization now handled elsewhere
- * conn -- connection context
- * requested_user -- the identity/username to authorize (NUL terminated)
- * rlen -- length of requested_user
- * auth_identity -- the identity associated with the secret (NUL terminated)
- * alen -- length of auth_identity
- * default_realm -- default user realm, as passed to sasl_server_new if
- * urlen -- length of default realm
- * propctx -- auxiliary properties
- * returns SASL_OK on success,
- * SASL_NOAUTHZ or other SASL response on failure
- */
- typedef int sasl_authorize_t(sasl_conn_t *conn,
- void *context,
- const char *requested_user, unsigned rlen,
- const char *auth_identity, unsigned alen,
- const char *def_realm, unsigned urlen,
- struct propctx *propctx);
- #define SASL_CB_PROXY_POLICY 0x8001
-
- /* functions for "userdb" based plugins to call to get/set passwords.
- * the location for the passwords is determined by the caller or middleware.
- * plug-ins may get passwords from other locations.
- */
-
- /* callback to verify a plaintext password against the caller-supplied
- * user database. This is necessary to allow additional <method>s for
- * encoding of the userPassword property.
- * user -- NUL terminated user name with user@realm syntax
- * pass -- password to check (may not be NUL terminated)
- * passlen -- length of password to check
- * propctx -- auxiliary properties for user
- */
- typedef int sasl_server_userdb_checkpass_t(sasl_conn_t *conn,
- void *context,
- const char *user,
- const char *pass,
- unsigned passlen,
- struct propctx *propctx);
- #define SASL_CB_SERVER_USERDB_CHECKPASS (0x8005)
-
- /* callback to store/change a plaintext password in the user database
- * user -- NUL terminated user name with user@realm syntax
- * pass -- password to store (may not be NUL terminated)
- * passlen -- length of password to store
- * propctx -- auxiliary properties (not stored)
- * flags -- see SASL_SET_* flags below (SASL_SET_CREATE optional)
- */
- typedef int sasl_server_userdb_setpass_t(sasl_conn_t *conn,
- void *context,
- const char *user,
- const char *pass,
- unsigned passlen,
- struct propctx *propctx,
- unsigned flags);
- #define SASL_CB_SERVER_USERDB_SETPASS (0x8006)
-
- /* callback for a server-supplied user canonicalization function.
- *
- * This function is called directly after the mechanism has the
- * authentication and authorization IDs. It is called before any
- * User Canonicalization plugin is called. It has the responsibility
- * of copying its output into the provided output buffers.
- *
- * in, inlen -- user name to canonicalize, may not be NUL terminated
- * may be same buffer as out
- * flags -- not currently used, supplied by auth mechanism
- * user_realm -- the user realm (may be NULL in case of client)
- * out -- buffer to copy user name
- * out_max -- max length of user name
- * out_len -- set to length of user name
- *
- * returns
- * SASL_OK on success
- * SASL_BADPROT username contains invalid character
- */
-
- /* User Canonicalization Function Flags */
-
- #define SASL_CU_NONE 0x00 /* Not a valid flag to pass */
- /* One of the following two is required */
- #define SASL_CU_AUTHID 0x01
- #define SASL_CU_AUTHZID 0x02
-
- typedef int sasl_canon_user_t(sasl_conn_t *conn,
- void *context,
- const char *in, unsigned inlen,
- unsigned flags,
- const char *user_realm,
- char *out,
- unsigned out_max, unsigned *out_len);
-
- #define SASL_CB_CANON_USER (0x8007)
-
- /**********************************
- * Common Client/server functions *
- **********************************/
-
- /* Types of paths to set (see sasl_set_path below). */
- #define SASL_PATH_TYPE_PLUGIN 0
- #define SASL_PATH_TYPE_CONFIG 1
-
- /* a simpler way to set plugin path or configuration file path
- * without the need to set sasl_getpath_t callback.
- *
- * This function can be called before sasl_server_init/sasl_client_init.
- */
- LIBSASL_API int sasl_set_path (int path_type, char * path);
-
- /* get sasl library version information
- * implementation is a vendor-defined string
- * version is a vender-defined representation of the version #.
- *
- * This function is being deprecated in favor of sasl_version_info. */
- LIBSASL_API void sasl_version(const char **implementation,
- int *version);
-
- /* Extended version of sasl_version().
- *
- * This function is to be used
- * for library version display and logging
- * for bug workarounds in old library versions
- *
- * The sasl_version_info is not to be used for API feature detection.
- *
- * All parameters are optional. If NULL is specified, the value is not returned.
- */
- LIBSASL_API void sasl_version_info (const char **implementation,
- const char **version_string,
- int *version_major,
- int *version_minor,
- int *version_step,
- int *version_patch);
-
- /* 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 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 in UTF-8 (only the US-ASCII subset if langlist is NULL)
- */
- LIBSASL_API const char *sasl_errstring(int saslerr,
- const char *langlist,
- const char **outlang);
-
- /* get detail about the last error that occurred on a connection
- * text is sanitized so it's suitable to send over the wire
- * (e.g., no distinction between SASL_BADAUTH and SASL_NOUSER)
- * input:
- * conn -- mandatory connection context
- * returns:
- * the error message in UTF-8 (only the US-ASCII subset permitted if no
- * SASL_CB_LANGUAGE callback is present)
- */
- LIBSASL_API const char *sasl_errdetail(sasl_conn_t *conn);
-
- /* set the error string which will be returned by sasl_errdetail() using
- * syslog()-style formatting (e.g. printf-style with %m as most recent
- * errno error)
- *
- * primarily for use by server callbacks such as the sasl_authorize_t
- * callback and internally to plug-ins
- *
- * This will also trigger a call to the SASL logging callback (if any)
- * with a level of SASL_LOG_FAIL unless the SASL_NOLOG flag is set.
- *
- * Messages should be sensitive to the current language setting. If there
- * is no SASL_CB_LANGUAGE callback messages MUST be US-ASCII otherwise UTF-8
- * is used and use of RFC 2482 for mixed-language text is encouraged.
- *
- * if conn is NULL, function does nothing
- */
- LIBSASL_API void sasl_seterror(sasl_conn_t *conn, unsigned flags,
- const char *fmt, ...);
- #define SASL_NOLOG 0x01
-
- /* 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,
- const 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_DEFUSERREALM 3 /* default realm passed to server_new */
- /* or set with setprop */
- #define SASL_GETOPTCTX 4 /* context for getopt callback */
- #define SASL_CALLBACK 7 /* current callback function list */
- #define SASL_IPLOCALPORT 8 /* iplocalport string passed to server_new */
- #define SASL_IPREMOTEPORT 9 /* ipremoteport string passed to server_new */
-
- /* This returns a string which is either empty or has an error message
- * from sasl_seterror (e.g., from a plug-in or callback). It differs
- * from the result of sasl_errdetail() which also takes into account the
- * last return status code.
- */
- #define SASL_PLUGERR 10
-
- /* a handle to any delegated credentials or NULL if none is present
- * is returned by the mechanism. The user will probably need to know
- * which mechanism was used to actually known how to make use of them
- * currently only implemented for the gssapi mechanism */
- #define SASL_DELEGATEDCREDS 11
-
- #define SASL_SERVICE 12 /* service passed to sasl_*_new */
- #define SASL_SERVERFQDN 13 /* serverFQDN passed to sasl_*_new */
- #define SASL_AUTHSOURCE 14 /* name of auth source last used, useful
- * for failed authentication tracking */
- #define SASL_MECHNAME 15 /* active mechanism name, if any */
- #define SASL_AUTHUSER 16 /* authentication/admin user */
- #define SASL_APPNAME 17 /* application name (used for logging/
- configuration), same as appname parameter
- to sasl_server_init */
-
- /* GSS-API credential handle for sasl_client_step() or sasl_server_step().
- * The application is responsible for releasing this credential handle. */
- #define SASL_GSS_CREDS 18
-
- /* GSS name (gss_name_t) of the peer, as output by gss_inquire_context()
- * or gss_accept_sec_context().
- * On server end this is similar to SASL_USERNAME, but the gss_name_t
- * structure can contain additional attributes associated with the peer.
- */
- #define SASL_GSS_PEER_NAME 19
-
- /* Local GSS name (gss_name_t) as output by gss_inquire_context(). This
- * is particularly useful for servers that respond to multiple names. */
- #define SASL_GSS_LOCAL_NAME 20
-
-
- /* 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_ssf_t *) */
- #define SASL_SEC_PROPS 101 /* sasl_security_properties_t */
- #define SASL_AUTH_EXTERNAL 102 /* external authentication ID (const char *) */
-
- /* If the SASL_AUTH_EXTERNAL value is non-NULL, then a special version of the
- * EXTERNAL mechanism is enabled (one for server-embedded EXTERNAL mechanisms).
- * Otherwise, the EXTERNAL mechanism will be absent unless a plug-in
- * including EXTERNAL is present.
- */
-
- /* 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; /* presented to user (e.g. OTP challenge) */
- const char *prompt; /* presented to user (e.g. "Username: ") */
- const char *defresult; /* default result string */
- const void *result; /* set to point to result */
- unsigned len; /* set to length of result */
- } sasl_interact_t;
-
- /* initialize the SASL client drivers
- * callbacks -- base callbacks for all client connections;
- * must include getopt callback
- * returns:
- * SASL_OK -- Success
- * SASL_NOMEM -- Not enough memory
- * SASL_BADVERS -- Mechanism version mismatch
- * SASL_BADPARAM -- missing getopt callback or 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
- * iplocalport -- client IPv4/IPv6 domain literal string with port
- * (if NULL, then mechanisms requiring IPaddr are disabled)
- * ipremoteport -- server IPv4/IPv6 domain literal string with port
- * (if NULL, then mechanisms requiring IPaddr are disabled)
- * 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
- * flags -- server usage 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 char *iplocalport,
- const char *ipremoteport,
- const sasl_callback_t *prompt_supp,
- unsigned flags,
- sasl_conn_t **pconn);
-
- /* select a mechanism for a connection
- * mechlist -- mechanisms server has available (punctuation ignored)
- * if NULL, then discard cached info and retry last mech
- * output:
- * prompt_need -- on SASL_INTERACT, list of prompts needed to continue
- * may be NULL if callbacks provided
- * clientout -- the initial client response to send to the server
- * will be valid until next call to client_start/client_step
- * NULL if mech doesn't include initial client challenge
- * mech -- set to mechansm name of selected mechanism (may be NULL)
- *
- * 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_interact_t **prompt_need,
- const 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
- * will be valid until next call to client_start/client_step
- *
- * 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,
- const char **clientout,
- unsigned *clientoutlen);
-
- /**************
- * Server API *
- **************/
-
- /* initialize server drivers, done once per process
- * callbacks -- callbacks for all server connections; must include
- * getopt callback
- * 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);
-
- /* IP/port syntax:
- * a.b.c.d;p where a-d are 0-255 and p is 0-65535 port number.
- * e:f:g:h:i:j:k:l;p where e-l are 0000-ffff lower-case hexidecimal
- * e:f:g:h:i:j:a.b.c.d;p alternate syntax for previous
- *
- * Note that one or more "0" fields in f-k can be replaced with "::"
- * Thus: e:f:0000:0000:0000:j:k:l;p
- * can be abbreviated: e:f::j:k:l;p
- *
- * A buffer of size 52 is adequate for the longest format with NUL terminator.
- */
-
- /* create context for a single SASL connection
- * service -- registered name of the service using SASL (e.g. "imap")
- * serverFQDN -- Fully qualified domain name of server. NULL means use
- * gethostname() or equivalent.
- * Useful for multi-homed servers.
- * user_realm -- permits multiple user realms on server, NULL = default
- * iplocalport -- server IPv4/IPv6 domain literal string with port
- * (if NULL, then mechanisms requiring IPaddr are disabled)
- * ipremoteport -- client IPv4/IPv6 domain literal string with port
- * (if NULL, then mechanisms requiring IPaddr are disabled)
- * callbacks -- callbacks (e.g., authorization, lang, new getopt context)
- * flags -- usage 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 char *iplocalport,
- const char *ipremoteport,
- const sasl_callback_t *callbacks,
- unsigned flags,
- sasl_conn_t **pconn);
-
- /* Return an array of NUL-terminated strings, terminated by a NULL pointer,
- * which lists all possible mechanisms that the library can supply
- *
- * Returns NULL on failure. */
- LIBSASL_API const char ** sasl_global_listmech(void);
-
- /* This returns a list of mechanisms in a NUL-terminated string
- * conn -- the connection to list mechanisms for (either client
- * or server)
- * user -- restricts mechanisms to those available to that user
- * (may be NULL, not used for client case)
- * prefix -- appended to beginning of result
- * sep -- appended between mechanisms
- * suffix -- appended to end of result
- * results:
- * result -- NUL terminated result which persists until next
- * call to sasl_listmech for this sasl_conn_t
- * 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,
- const char **result,
- unsigned *plen,
- int *pcount);
-
- /* start a mechanism exchange within a connection context
- * mech -- the mechanism name client requested
- * clientin -- client initial response (NUL terminated), NULL if empty
- * clientinlen -- length of initial response
- * serverout -- initial server challenge, NULL if done
- * (library handles freeing this string)
- * serveroutlen -- length of initial server challenge
- * output:
- * pconn -- the connection negotiation state on success
- *
- * Same returns as sasl_server_step() or
- * SASL_NOMECH if mechanism not available.
- */
- LIBSASL_API int sasl_server_start(sasl_conn_t *conn,
- const char *mech,
- const char *clientin,
- unsigned clientinlen,
- const char **serverout,
- unsigned *serveroutlen);
-
- /* 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
- * (library handles freeing this)
- *
- * 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,
- const char **serverout,
- unsigned *serveroutlen);
-
- /* check if an apop exchange is valid
- * (note this is an optional part of the SASL API)
- * if challenge is NULL, just check if APOP is enabled
- * inputs:
- * challenge -- challenge which was sent to client
- * challen -- length of challenge, 0 = strlen(challenge)
- * response -- client response, "<user> <digest>" (RFC 1939)
- * resplen -- length of response, 0 = strlen(response)
- * returns
- * SASL_OK -- success
- * SASL_BADAUTH -- authentication failed
- * SASL_BADPARAM -- missing challenge
- * SASL_BADPROT -- protocol error (e.g., response in wrong format)
- * SASL_NOVERIFY -- user found, but no verifier
- * SASL_NOMECH -- mechanism not supported
- * SASL_NOUSER -- user not found
- */
- LIBSASL_API int sasl_checkapop(sasl_conn_t *conn,
- const char *challenge, unsigned challen,
- const char *response, unsigned resplen);
-
- /* check if a plaintext password is valid
- * if user is NULL, check if plaintext passwords are enabled
- * inputs:
- * user -- user to query in current user_domain
- * userlen -- length of username, 0 = strlen(user)
- * pass -- plaintext password to check
- * passlen -- length of password, 0 = strlen(pass)
- * returns
- * SASL_OK -- success
- * SASL_NOMECH -- mechanism not supported
- * SASL_NOVERIFY -- 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);
-
- /* check if a user exists on server
- * conn -- connection context
- * service -- registered name of the service using SASL (e.g. "imap")
- * user_realm -- permits multiple user realms on server, NULL = default
- * user -- NUL terminated user name
- *
- * returns:
- * SASL_OK -- success
- * SASL_DISABLED -- account disabled
- * SASL_NOUSER -- user not found
- * SASL_NOVERIFY -- user found, but no usable mechanism
- * SASL_NOMECH -- no mechanisms enabled
- */
- LIBSASL_API int sasl_user_exists(sasl_conn_t *conn,
- const char *service,
- const char *user_realm,
- const char *user);
-
- /* 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)
- * oldpass -- NULL will sometimes work
- * oldpasslen -- length of password, 0 = strlen(oldpass)
- * flags -- see flags below
- *
- * returns:
- * SASL_NOCHANGE -- proper entry already exists
- * SASL_NOMECH -- no authdb supports password setting as configured
- * SASL_NOVERIFY -- user exists, but no settable password present
- * SASL_DISABLED -- account disabled
- * SASL_PWLOCK -- password locked
- * SASL_WEAKPASS -- password too weak for security policy
- * SASL_NOUSERPASS -- user-supplied passwords not permitted
- * 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,
- const char *oldpass, unsigned oldpasslen,
- unsigned flags);
- #define SASL_SET_CREATE 0x01 /* create a new entry for user */
- #define SASL_SET_DISABLE 0x02 /* disable user account */
- #define SASL_SET_NOPLAIN 0x04 /* do not store secret in plain text */
- #define SASL_SET_CURMECH_ONLY 0x08 /* set the mechanism specific password only.
- fail if no current mechanism */
-
- /*********************************************************
- * Auxiliary Property Support -- added by cjn 1999-09-29 *
- *********************************************************/
-
- #define SASL_AUX_END NULL /* last auxiliary property */
-
- /* traditional Posix items (should be implemented on Posix systems) */
- #define SASL_AUX_PASSWORD_PROP "userPassword" /* User Password */
- #define SASL_AUX_PASSWORD "*" SASL_AUX_PASSWORD_PROP /* User Password (of authid) */
- #define SASL_AUX_UIDNUM "uidNumber" /* UID number for the user */
- #define SASL_AUX_GIDNUM "gidNumber" /* GID for the user */
- #define SASL_AUX_FULLNAME "gecos" /* full name of the user, unix-style */
- #define SASL_AUX_HOMEDIR "homeDirectory" /* home directory for user */
- #define SASL_AUX_SHELL "loginShell" /* login shell for the user */
-
- /* optional additional items (not necessarily implemented) */
- /* single preferred mail address for user canonically-quoted
- * RFC821/822 syntax */
- #define SASL_AUX_MAILADDR "mail"
- /* path to unix-style mailbox for user */
- #define SASL_AUX_UNIXMBX "mailMessageStore"
- /* SMTP mail channel name to use if user authenticates successfully */
- #define SASL_AUX_MAILCHAN "mailSMTPSubmitChannel"
-
- /* Request a set of auxiliary properties
- * conn connection context
- * propnames list of auxiliary property names to request ending with
- * NULL.
- *
- * Subsequent calls will add items to the request list. Call with NULL
- * to clear the request list.
- *
- * errors
- * SASL_OK -- success
- * SASL_BADPARAM -- bad count/conn parameter
- * SASL_NOMEM -- out of memory
- */
- LIBSASL_API int sasl_auxprop_request(sasl_conn_t *conn,
- const char **propnames);
-
- /* Returns current auxiliary property context.
- * Use functions in prop.h to access content
- *
- * if authentication hasn't completed, property values may be empty/NULL
- *
- * properties not recognized by active plug-ins will be left empty/NULL
- *
- * returns NULL if conn is invalid.
- */
- LIBSASL_API struct propctx *sasl_auxprop_getctx(sasl_conn_t *conn);
-
- /* Store the set of auxiliary properties for the given user.
- * Use functions in prop.h to set the content.
- *
- * conn connection context
- * ctx property context from prop_new()/prop_request()/prop_set()
- * user NUL terminated user
- *
- * Call with NULL 'ctx' to see if the backend allows storing properties.
- *
- * errors
- * SASL_OK -- success
- * SASL_NOMECH -- can not store some/all properties
- * SASL_BADPARAM -- bad conn/ctx/user parameter
- * SASL_NOMEM -- out of memory
- * SASL_FAIL -- failed to store
- */
- LIBSASL_API int sasl_auxprop_store(sasl_conn_t *conn,
- struct propctx *ctx, const char *user);
-
- /**********************
- * security layer API *
- **********************/
-
- /* encode a block of data for transmission using security layer,
- * returning the input buffer if there is no security layer.
- * output is only valid until next call to sasl_encode or sasl_encodev
- * returns:
- * SASL_OK -- success (returns input if no layer negotiated)
- * SASL_NOTDONE -- security layer negotiation not finished
- * SASL_BADPARAM -- inputlen is greater than the SASL_MAXOUTBUF
- */
- LIBSASL_API int sasl_encode(sasl_conn_t *conn,
- const char *input, unsigned inputlen,
- const char **output, unsigned *outputlen);
-
- /* encode a block of data for transmission using security layer
- * output is only valid until next call to sasl_encode or sasl_encodev
- * returns:
- * SASL_OK -- success (returns input if no layer negotiated)
- * SASL_NOTDONE -- security layer negotiation not finished
- * SASL_BADPARAM -- input length is greater than the SASL_MAXOUTBUF
- * or no security layer
- */
- LIBSASL_API int sasl_encodev(sasl_conn_t *conn,
- const struct iovec *invec, unsigned numiov,
- const char **output, unsigned *outputlen);
-
- /* decode a block of data received using security layer
- * returning the input buffer if there is no security layer.
- * output is only valid until next call to sasl_decode
- *
- * if outputlen is 0 on return, than the value of output is undefined.
- *
- * returns:
- * SASL_OK -- success (returns input if no layer negotiated)
- * SASL_NOTDONE -- security layer negotiation not finished
- * SASL_BADMAC -- bad message integrity check
- */
- LIBSASL_API int sasl_decode(sasl_conn_t *conn,
- const char *input, unsigned inputlen,
- const char **output, unsigned *outputlen);
-
- #ifdef __cplusplus
- }
- #endif
-
- #endif /* SASL_H */
-