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saslplug.h
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/* saslplug.h -- API for SASL plug-ins */ #ifndef SASLPLUG_H #define SASLPLUG_H 1 #ifndef MD5GLOBAL_H #include "md5global.h" #endif #ifndef MD5_H #include "md5.h" #endif #ifndef HMAC_MD5_H #include "hmac-md5.h" #endif #ifndef PROP_H #include "prop.h" #endif #ifdef __cplusplus extern "C" { #endif /* callback to lookup a sasl_callback_t for a connection * input: * conn -- the connection to lookup a callback for * callbacknum -- the number of the callback * output: * pproc -- pointer to the callback function (set to NULL on failure) * pcontext -- pointer to the callback context (set to NULL on failure) * returns: * SASL_OK -- no error * SASL_FAIL -- unable to find a callback of the requested type * SASL_INTERACT -- caller must use interaction to get data */ typedef int (*sasl_callback_ft)(void); typedef int sasl_getcallback_t(sasl_conn_t *conn, unsigned long callbackid, sasl_callback_ft * pproc, void **pcontext); /* The sasl_utils structure will remain backwards compatible unless * the SASL_*_PLUG_VERSION is changed incompatibly * higher SASL_UTILS_VERSION numbers indicate more functions are available */ #define SASL_UTILS_VERSION 4 /* utility function set for plug-ins */ typedef struct sasl_utils { int version; /* contexts */ sasl_conn_t *conn; sasl_rand_t *rpool; void *getopt_context; /* option function */ sasl_getopt_t *getopt; /* allocation functions: */ sasl_malloc_t *malloc; sasl_calloc_t *calloc; sasl_realloc_t *realloc; sasl_free_t *free; /* mutex functions: */ sasl_mutex_alloc_t *mutex_alloc; sasl_mutex_lock_t *mutex_lock; sasl_mutex_unlock_t *mutex_unlock; sasl_mutex_free_t *mutex_free; /* MD5 hash and HMAC functions */ void (*MD5Init)(MD5_CTX *); void (*MD5Update)(MD5_CTX *, const unsigned char *text, unsigned int len); void (*MD5Final)(unsigned char [16], MD5_CTX *); void (*hmac_md5)(const unsigned char *text, int text_len, const unsigned char *key, int key_len, unsigned char [16]); void (*hmac_md5_init)(HMAC_MD5_CTX *, const unsigned char *key, int len); /* hmac_md5_update() is just a call to MD5Update on inner context */ void (*hmac_md5_final)(unsigned char [16], HMAC_MD5_CTX *); void (*hmac_md5_precalc)(HMAC_MD5_STATE *, const unsigned char *key, int len); void (*hmac_md5_import)(HMAC_MD5_CTX *, HMAC_MD5_STATE *); /* mechanism utility functions (same as above): */ int (*mkchal)(sasl_conn_t *conn, char *buf, unsigned maxlen, unsigned hostflag); int (*utf8verify)(const char *str, unsigned len); void (*rand)(sasl_rand_t *rpool, char *buf, unsigned len); void (*churn)(sasl_rand_t *rpool, const char *data, unsigned len); /* This allows recursive calls to the sasl_checkpass() routine from * within a SASL plug-in. This MUST NOT be used in the PLAIN mechanism * as sasl_checkpass MAY be a front-end for the PLAIN mechanism. * This is intended for use by the non-standard LOGIN mechanism and * potentially by a future mechanism which uses public-key technology to * set up a lightweight encryption layer just for sending a password. */ int (*checkpass)(sasl_conn_t *conn, const char *user, unsigned userlen, const char *pass, unsigned passlen); /* Access to base64 encode/decode routines */ int (*decode64)(const char *in, unsigned inlen, char *out, unsigned outmax, unsigned *outlen); int (*encode64)(const char *in, unsigned inlen, char *out, unsigned outmax, unsigned *outlen); /* erase a buffer */ void (*erasebuffer)(char *buf, unsigned len); /* callback to sasl_getprop() and sasl_setprop() */ int (*getprop)(sasl_conn_t *conn, int propnum, const void **pvalue); int (*setprop)(sasl_conn_t *conn, int propnum, const void *value); /* callback function */ sasl_getcallback_t *getcallback; /* format a message and then pass it to the SASL_CB_LOG callback * * use syslog()-style formatting (printf with %m as a human readable text * (strerror()) for the error specified as the parameter). * The implementation may use a fixed size buffer not smaller * than 512 octets if it securely truncates the message. * * level is a SASL_LOG_* level (see sasl.h) */ void (*log)(sasl_conn_t *conn, int level, const char *fmt, ...) __attribute__((format(printf, 3, 4))); /* callback to sasl_seterror() */ void (*seterror)(sasl_conn_t *conn, unsigned flags, const char *fmt, ...) __attribute__((format(printf, 3, 4))); /* spare function pointer */ int *(*spare_fptr)(void); /* auxiliary property utilities */ struct propctx *(*prop_new)(unsigned estimate); int (*prop_dup)(struct propctx *src_ctx, struct propctx **dst_ctx); int (*prop_request)(struct propctx *ctx, const char **names); const struct propval *(*prop_get)(struct propctx *ctx); int (*prop_getnames)(struct propctx *ctx, const char **names, struct propval *vals); void (*prop_clear)(struct propctx *ctx, int requests); void (*prop_dispose)(struct propctx **ctx); int (*prop_format)(struct propctx *ctx, const char *sep, int seplen, char *outbuf, unsigned outmax, unsigned *outlen); int (*prop_set)(struct propctx *ctx, const char *name, const char *value, int vallen); int (*prop_setvals)(struct propctx *ctx, const char *name, const char **values); void (*prop_erase)(struct propctx *ctx, const char *name); int (*auxprop_store)(sasl_conn_t *conn, struct propctx *ctx, const char *user); /* for additions which don't require a version upgrade; set to 0 */ int (*spare_fptr1)(void); int (*spare_fptr2)(void); } sasl_utils_t; /* * output parameters from SASL API * * created / destroyed by the glue code, though probably filled in * by a combination of the plugin, the glue code, and the canon_user callback. * */ typedef struct sasl_out_params { unsigned doneflag; /* exchange complete */ const char *user; /* canonicalized user name */ const char *authid; /* canonicalized authentication id */ unsigned ulen; /* length of canonicalized user name */ unsigned alen; /* length of canonicalized authid */ /* security layer information */ unsigned maxoutbuf; /* Maximum buffer size, which will produce buffer no bigger than the negotiated SASL maximum buffer size */ sasl_ssf_t mech_ssf; /* Should be set non-zero if negotiation of a * security layer was *attempted*, even if * the negotiation failed */ void *encode_context; int (*encode)(void *context, const struct iovec *invec, unsigned numiov, const char **output, unsigned *outputlen); void *decode_context; int (*decode)(void *context, const char *input, unsigned inputlen, const char **output, unsigned *outputlen); /* Pointer to delegated (client's) credentials, if supported by the SASL mechanism */ void *client_creds; /* for additions which don't require a version upgrade; set to 0 */ const void *gss_peer_name; const void *gss_local_name; const char *cbindingname; /* channel binding name from packet */ int (*spare_fptr1)(void); int (*spare_fptr2)(void); unsigned int cbindingdisp; /* channel binding disposition from client */ int spare_int2; int spare_int3; int spare_int4; /* set to 0 initially, this allows a plugin with extended parameters * to work with an older framework by updating version as parameters * are added. */ int param_version; } sasl_out_params_t; /* Used by both client and server side plugins */ typedef enum { SASL_INFO_LIST_START = 0, SASL_INFO_LIST_MECH, SASL_INFO_LIST_END } sasl_info_callback_stage_t; /****************************** * Channel binding macros ** ******************************/ typedef enum { SASL_CB_DISP_NONE = 0, /* client did not support CB */ SASL_CB_DISP_WANT, /* client supports CB, thinks server does not */ SASL_CB_DISP_USED /* client supports and used CB */ } sasl_cbinding_disp_t; /* TRUE if channel binding is non-NULL */ #define SASL_CB_PRESENT(params) ((params)->cbinding != NULL) /* TRUE if channel binding is marked critical */ #define SASL_CB_CRITICAL(params) (SASL_CB_PRESENT(params) && \ (params)->cbinding->critical) /****************************** * Client Mechanism Functions * ******************************/ /* * input parameters to client SASL plugin * * created / destroyed by the glue code * */ typedef struct sasl_client_params { const char *service; /* service name */ const char *serverFQDN; /* server fully qualified domain name */ const char *clientFQDN; /* client's fully qualified domain name */ const sasl_utils_t *utils; /* SASL API utility routines -- * for a particular sasl_conn_t, * MUST remain valid until mech_free is * called */ const sasl_callback_t *prompt_supp; /* client callback list */ const char *iplocalport; /* server IP domain literal & port */ const char *ipremoteport; /* client IP domain literal & port */ unsigned servicelen; /* length of service */ unsigned slen; /* length of serverFQDN */ unsigned clen; /* length of clientFQDN */ unsigned iploclen; /* length of iplocalport */ unsigned ipremlen; /* length of ipremoteport */ /* application's security requirements & info */ sasl_security_properties_t props; sasl_ssf_t external_ssf; /* external SSF active */ /* for additions which don't require a version upgrade; set to 0 */ const void *gss_creds; /* GSS credential handle */ const sasl_channel_binding_t *cbinding; /* client channel binding */ const sasl_http_request_t *http_request;/* HTTP Digest request method */ void *spare_ptr4; /* Canonicalize a user name from on-wire to internal format * added rjs3 2001-05-23 * Must be called once user name aquired if canon_user is non-NULL. * conn connection context * in user name from wire protocol (need not be NUL terminated) * len length of user name from wire protocol (0 = strlen(user)) * flags for SASL_CU_* flags * oparams the user, authid, ulen, alen, fields are * set appropriately after canonicalization/copying and * authorization of arguments * * responsible for setting user, ulen, authid, and alen in the oparams * structure * * default behavior is to strip leading and trailing whitespace, as * well as allocating space for and copying the parameters. * * results: * SASL_OK -- success * SASL_NOMEM -- out of memory * SASL_BADPARAM -- invalid conn * SASL_BADPROT -- invalid user/authid */ int (*canon_user)(sasl_conn_t *conn, const char *in, unsigned len, unsigned flags, sasl_out_params_t *oparams); int (*spare_fptr1)(void); unsigned int cbindingdisp; int spare_int2; int spare_int3; /* flags field as passed to sasl_client_new */ unsigned flags; /* set to 0 initially, this allows a plugin with extended parameters * to work with an older framework by updating version as parameters * are added. */ int param_version; } sasl_client_params_t; /* features shared between client and server */ /* These allow the glue code to handle client-first and server-last issues */ /* This indicates that the mechanism prefers to do client-send-first * if the protocol allows it. */ #define SASL_FEAT_WANT_CLIENT_FIRST 0x0002 /* This feature is deprecated. Instead, plugins should set *serverout to * non-NULL and return SASL_OK intelligently to allow flexible use of * server-last semantics #define SASL_FEAT_WANT_SERVER_LAST 0x0004 */ /* This feature is deprecated. Instead, plugins should correctly set * SASL_FEAT_SERVER_FIRST as needed #define SASL_FEAT_INTERNAL_CLIENT_FIRST 0x0008 */ /* This indicates that the plugin is server-first only. * Not defining either of SASL_FEAT_SERVER_FIRST or * SASL_FEAT_WANT_CLIENT_FIRST indicates that the mechanism * will handle the client-first situation internally. */ #define SASL_FEAT_SERVER_FIRST 0x0010 /* This plugin allows proxying */ #define SASL_FEAT_ALLOWS_PROXY 0x0020 /* server plugin don't use cleartext userPassword attribute */ #define SASL_FEAT_DONTUSE_USERPASSWD 0x0080 /* Underlying mechanism uses GSS framing */ #define SASL_FEAT_GSS_FRAMING 0x0100 /* Underlying mechanism supports channel binding */ #define SASL_FEAT_CHANNEL_BINDING 0x0800 /* This plugin can be used for HTTP authentication */ #define SASL_FEAT_SUPPORTS_HTTP 0x1000 /* client plug-in features */ #define SASL_FEAT_NEEDSERVERFQDN 0x0001 /* a C object for a client mechanism */ typedef struct sasl_client_plug { /* mechanism name */ const char *mech_name; /* best mech additional security layer strength factor */ sasl_ssf_t max_ssf; /* best security flags, as defined in sasl_security_properties_t */ unsigned security_flags; /* features of plugin */ unsigned features; /* required prompt ids, NULL = user/pass only */ const unsigned long *required_prompts; /* global state for mechanism */ void *glob_context; /* create context for mechanism, using params supplied * glob_context -- from above * params -- params from sasl_client_new * conn_context -- context for one connection * returns: * SASL_OK -- success * SASL_NOMEM -- not enough memory * SASL_WRONGMECH -- mech doesn't support security params */ int (*mech_new)(void *glob_context, sasl_client_params_t *cparams, void **conn_context); /* perform one step of exchange. NULL is passed for serverin on * first step. * returns: * SASL_OK -- success * SASL_INTERACT -- user interaction needed to fill in prompts * SASL_BADPROT -- server protocol incorrect/cancelled * SASL_BADSERV -- server failed mutual auth */ int (*mech_step)(void *conn_context, sasl_client_params_t *cparams, const char *serverin, unsigned serverinlen, sasl_interact_t **prompt_need, const char **clientout, unsigned *clientoutlen, sasl_out_params_t *oparams); /* dispose of connection context from mech_new */ void (*mech_dispose)(void *conn_context, const sasl_utils_t *utils); /* free all global space used by mechanism * mech_dispose must be called on all mechanisms first */ void (*mech_free)(void *glob_context, const sasl_utils_t *utils); /* perform precalculations during a network round-trip * or idle period. conn_context may be NULL * returns 1 if action taken, 0 if no action taken */ int (*idle)(void *glob_context, void *conn_context, sasl_client_params_t *cparams); /* for additions which don't require a version upgrade; set to 0 */ int (*spare_fptr1)(void); int (*spare_fptr2)(void); } sasl_client_plug_t; #define SASL_CLIENT_PLUG_VERSION 4 /* plug-in entry point: * utils -- utility callback functions * max_version -- highest client plug version supported * returns: * out_version -- client plug version of result * pluglist -- list of mechanism plug-ins * plugcount -- number of mechanism plug-ins * results: * SASL_OK -- success * SASL_NOMEM -- failure * SASL_BADVERS -- max_version too small * SASL_BADPARAM -- bad config string * ... */ typedef int sasl_client_plug_init_t(const sasl_utils_t *utils, int max_version, int *out_version, sasl_client_plug_t **pluglist, int *plugcount); /* add a client plug-in */ LIBSASL_API int sasl_client_add_plugin(const char *plugname, sasl_client_plug_init_t *cplugfunc); typedef struct client_sasl_mechanism { int version; char *plugname; const sasl_client_plug_t *plug; } client_sasl_mechanism_t; typedef void sasl_client_info_callback_t (client_sasl_mechanism_t *m, sasl_info_callback_stage_t stage, void *rock); /* Dump information about available client plugins */ LIBSASL_API int sasl_client_plugin_info (const char *mech_list, sasl_client_info_callback_t *info_cb, void *info_cb_rock); /******************** * Server Functions * ********************/ /* log message formatting routine */ typedef void sasl_logmsg_p(sasl_conn_t *conn, const char *fmt, ...) __attribute__((format(printf, 2, 3))); /* * input parameters to server SASL plugin * * created / destroyed by the glue code * */ typedef struct sasl_server_params { const char *service; /* NULL = default service for user_exists and setpass */ const char *appname; /* name of calling application */ const char *serverFQDN; /* server default fully qualified domain name * (e.g., gethostname) */ const char *user_realm; /* realm for user (NULL = client supplied) */ const char *iplocalport; /* server IP domain literal & port */ const char *ipremoteport; /* client IP domain literal & port */ unsigned servicelen; /* length of service */ unsigned applen; /* length of appname */ unsigned slen; /* length of serverFQDN */ unsigned urlen; /* length of user_realm */ unsigned iploclen; /* length of iplocalport */ unsigned ipremlen; /* length of ipremoteport */ /* This indicates the level of logging desired. See SASL_LOG_* * in sasl.h * * Plug-ins can ignore this and just pass their desired level to * the log callback. This is primarily used to eliminate logging which * might be a performance problem (e.g., full protocol trace) and * to select between SASL_LOG_TRACE and SASL_LOG_PASS alternatives */ int log_level; const sasl_utils_t *utils; /* SASL API utility routines -- * for a particular sasl_conn_t, * MUST remain valid until mech_free is * called */ const sasl_callback_t *callbacks; /* Callbacks from application */ /* application's security requirements */ sasl_security_properties_t props; sasl_ssf_t external_ssf; /* external SSF active */ /* Pointer to the function which takes the plaintext passphrase and * transitions a user to non-plaintext mechanisms via setpass calls. * (NULL = auto transition not enabled/supported) * * If passlen is 0, it defaults to strlen(pass). * returns 0 if no entry added, 1 if entry added */ int (*transition)(sasl_conn_t *conn, const char *pass, unsigned passlen); /* Canonicalize a user name from on-wire to internal format * added cjn 1999-09-21 * Must be called once user name acquired if canon_user is non-NULL. * conn connection context * user user name from wire protocol (need not be NUL terminated) * ulen length of user name from wire protocol (0 = strlen(user)) * flags for SASL_CU_* flags * oparams the user, authid, ulen, alen, fields are * set appropriately after canonicalization/copying and * authorization of arguments * * responsible for setting user, ulen, authid, and alen in the oparams * structure * * default behavior is to strip leading and trailing whitespace, as * well as allocating space for and copying the parameters. * * results: * SASL_OK -- success * SASL_NOMEM -- out of memory * SASL_BADPARAM -- invalid conn * SASL_BADPROT -- invalid user/authid */ int (*canon_user)(sasl_conn_t *conn, const char *user, unsigned ulen, unsigned flags, sasl_out_params_t *oparams); /* auxiliary property context (see definitions in prop.h) * added cjn 2000-01-30 * * NOTE: these properties are the ones associated with the * canonicalized "user" (user to login as / authorization id), not * the "authid" (user whose credentials are used / authentication id) * Prefix the property name with a "*" if a property associated with * the "authid" is interesting. */ struct propctx *propctx; /* for additions which don't require a version upgrade; set to 0 */ const void *gss_creds; /* GSS credential handle */ const sasl_channel_binding_t *cbinding; /* server channel binding */ const sasl_http_request_t *http_request;/* HTTP Digest request method */ void *spare_ptr4; int (*spare_fptr1)(void); int (*spare_fptr2)(void); int spare_int1; int spare_int2; int spare_int3; /* flags field as passed to sasl_server_new */ unsigned flags; /* set to 0 initially, this allows a plugin with extended parameters * to work with an older framework by updating version as parameters * are added. */ int param_version; } sasl_server_params_t; /* logging levels (more levels may be added later, if necessary): */ #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 */ /* additional flags for setpass() function below: */ /* SASL_SET_CREATE create user if pass non-NULL */ /* SASL_SET_DISABLE disable user */ #define SASL_SET_REMOVE SASL_SET_CREATE /* remove user if pass is NULL */ /* features for server plug-in */ #define SASL_FEAT_SERVICE 0x0200 /* service-specific passwords supported */ #define SASL_FEAT_GETSECRET 0x0400 /* sasl_server_{get,put}secret_t callbacks * required by plug-in */ /* a C object for a server mechanism */ typedef struct sasl_server_plug { /* mechanism name */ const char *mech_name; /* best mech additional security layer strength factor */ sasl_ssf_t max_ssf; /* best security flags, as defined in sasl_security_properties_t */ unsigned security_flags; /* features of plugin */ unsigned features; /* global state for mechanism */ void *glob_context; /* create a new mechanism handler * glob_context -- global context * sparams -- server config params * challenge -- server challenge from previous instance or NULL * challen -- length of challenge from previous instance or 0 * out: * conn_context -- connection context * errinfo -- error information * * returns: * SASL_OK -- successfully created mech instance * SASL_* -- any other server error code */ int (*mech_new)(void *glob_context, sasl_server_params_t *sparams, const char *challenge, unsigned challen, void **conn_context); /* perform one step in exchange * * returns: * SASL_OK -- success, all done * SASL_CONTINUE -- success, one more round trip * SASL_* -- any other server error code */ int (*mech_step)(void *conn_context, sasl_server_params_t *sparams, const char *clientin, unsigned clientinlen, const char **serverout, unsigned *serveroutlen, sasl_out_params_t *oparams); /* dispose of a connection state */ void (*mech_dispose)(void *conn_context, const sasl_utils_t *utils); /* free global state for mechanism * mech_dispose must be called on all mechanisms first */ void (*mech_free)(void *glob_context, const sasl_utils_t *utils); /* set a password (optional) * glob_context -- global context * sparams -- service, middleware utilities, etc. props ignored * user -- user name * pass -- password/passphrase (NULL = disable/remove/delete) * passlen -- length of password/passphrase * oldpass -- old password/passphrase (NULL = transition) * oldpasslen -- length of password/passphrase * flags -- see above * * returns: * SASL_NOCHANGE -- no change was needed * SASL_NOUSER -- no entry for user * SASL_NOVERIFY -- no mechanism compatible entry for user * SASL_PWLOCK -- password locked * SASL_DIABLED -- account disabled * etc. */ int (*setpass)(void *glob_context, sasl_server_params_t *sparams, const char *user, const char *pass, unsigned passlen, const char *oldpass, unsigned oldpasslen, unsigned flags); /* query which mechanisms are available for user * glob_context -- context * sparams -- service, middleware utilities, etc. props ignored * user -- NUL terminated user name * maxmech -- max number of strings in mechlist (0 = no output) * output: * mechlist -- an array of C string pointers, filled in with * mechanism names available to the user * * returns: * SASL_OK -- success * SASL_NOMEM -- not enough memory * SASL_FAIL -- lower level failure * SASL_DISABLED -- account disabled * SASL_NOUSER -- user not found * SASL_BUFOVER -- maxmech is too small * SASL_NOVERIFY -- user found, but no mechanisms available */ int (*user_query)(void *glob_context, sasl_server_params_t *sparams, const char *user, int maxmech, const char **mechlist); /* perform precalculations during a network round-trip * or idle period. conn_context may be NULL (optional) * returns 1 if action taken, 0 if no action taken */ int (*idle)(void *glob_context, void *conn_context, sasl_server_params_t *sparams); /* check if mechanism is available * optional--if NULL, mechanism is available based on ENABLE= in config * * If this routine sets conn_context to a non-NULL value, then the call * to mech_new will be skipped. This should not be done unless * there's a significant performance benefit, since it can cause * additional memory allocation in SASL core code to keep track of * contexts potentially for multiple mechanisms. * * This is called by the first call to sasl_listmech() for a * given connection context, thus for a given protocol it may * never be called. Note that if mech_avail returns SASL_NOMECH, * then that mechanism is considered disabled for the remainder * of the session. If mech_avail returns SASL_NOTDONE, then a * future call to mech_avail may still return either SASL_OK * or SASL_NOMECH. * * returns SASL_OK on success, * SASL_NOTDONE if mech is not available now, but may be later * (e.g. EXTERNAL w/o auth_id) * SASL_NOMECH if mech disabled */ int (*mech_avail)(void *glob_context, sasl_server_params_t *sparams, void **conn_context); /* for additions which don't require a version upgrade; set to 0 */ int (*spare_fptr2)(void); } sasl_server_plug_t; #define SASL_SERVER_PLUG_VERSION 4 /* plug-in entry point: * utils -- utility callback functions * plugname -- name of plug-in (may be NULL) * max_version -- highest server plug version supported * returns: * out_version -- server plug-in version of result * pluglist -- list of mechanism plug-ins * plugcount -- number of mechanism plug-ins * results: * SASL_OK -- success * SASL_NOMEM -- failure * SASL_BADVERS -- max_version too small * SASL_BADPARAM -- bad config string * ... */ typedef int sasl_server_plug_init_t(const sasl_utils_t *utils, int max_version, int *out_version, sasl_server_plug_t **pluglist, int *plugcount); /* * add a server plug-in */ LIBSASL_API int sasl_server_add_plugin(const char *plugname, sasl_server_plug_init_t *splugfunc); typedef struct server_sasl_mechanism { int version; int condition; /* set to SASL_NOUSER if no available users; set to SASL_CONTINUE if delayed plugin loading */ char *plugname; /* for AUTHSOURCE tracking */ const sasl_server_plug_t *plug; char *f; /* where should i load the mechanism from? */ } server_sasl_mechanism_t; typedef void sasl_server_info_callback_t (server_sasl_mechanism_t *m, sasl_info_callback_stage_t stage, void *rock); /* Dump information about available server plugins (separate functions are used for canon and auxprop plugins) */ LIBSASL_API int sasl_server_plugin_info (const char *mech_list, sasl_server_info_callback_t *info_cb, void *info_cb_rock); /********************************************************* * user canonicalization plug-in -- added cjn 1999-09-29 * *********************************************************/ typedef struct sasl_canonuser { /* optional features of plugin (set to 0) */ int features; /* spare integer (set to 0) */ int spare_int1; /* global state for plugin */ void *glob_context; /* name of plugin */ char *name; /* free global state for plugin */ void (*canon_user_free)(void *glob_context, const sasl_utils_t *utils); /* canonicalize a username * glob_context -- global context from this structure * sparams -- server params, note user_realm&propctx elements * user -- user to login as (may not be NUL terminated) * len -- length of user name (0 = strlen(user)) * flags -- for SASL_CU_* flags * out -- buffer to copy user name * out_max -- max length of user name * out_len -- set to length of user name * * note that the output buffers MAY be the same as the input buffers. * * returns * SASL_OK on success * SASL_BADPROT username contains invalid character */ int (*canon_user_server)(void *glob_context, sasl_server_params_t *sparams, const char *user, unsigned len, unsigned flags, char *out, unsigned out_umax, unsigned *out_ulen); int (*canon_user_client)(void *glob_context, sasl_client_params_t *cparams, const char *user, unsigned len, unsigned flags, char *out, unsigned out_max, unsigned *out_len); /* for additions which don't require a version upgrade; set to 0 */ int (*spare_fptr1)(void); int (*spare_fptr2)(void); int (*spare_fptr3)(void); } sasl_canonuser_plug_t; #define SASL_CANONUSER_PLUG_VERSION 5 /* default name for canonuser plug-in entry point is "sasl_canonuser_init" * similar to sasl_server_plug_init model, except only returns one * sasl_canonuser_plug_t structure; */ typedef int sasl_canonuser_init_t(const sasl_utils_t *utils, int max_version, int *out_version, sasl_canonuser_plug_t **plug, const char *plugname); /* add a canonuser plugin */ LIBSASL_API int sasl_canonuser_add_plugin(const char *plugname, sasl_canonuser_init_t *canonuserfunc); /****************************************************** * auxiliary property plug-in -- added cjn 1999-09-29 * ******************************************************/ typedef struct sasl_auxprop_plug { /* optional features of plugin (none defined yet, set to 0) */ int features; /* spare integer, must be set to 0 */ int spare_int1; /* global state for plugin */ void *glob_context; /* free global state for plugin (OPTIONAL) */ void (*auxprop_free)(void *glob_context, const sasl_utils_t *utils); /* fill in fields of an auxiliary property context * last element in array has id of SASL_AUX_END * elements with non-0 len should be ignored. */ int (*auxprop_lookup)(void *glob_context, sasl_server_params_t *sparams, unsigned flags, const char *user, unsigned ulen); /* name of the auxprop plugin */ char *name; /* store the fields/values of an auxiliary property context (OPTIONAL) * * if ctx is NULL, just check if storing properties is enabled * * returns * SASL_OK on success * SASL_FAIL on failure */ int (*auxprop_store)(void *glob_context, sasl_server_params_t *sparams, struct propctx *ctx, const char *user, unsigned ulen); } sasl_auxprop_plug_t; /* auxprop lookup flags */ #define SASL_AUXPROP_OVERRIDE 0x01 /* if clear, ignore auxiliary properties * with non-zero len field. If set, * override value of those properties */ #define SASL_AUXPROP_AUTHZID 0x02 /* if clear, we are looking up the * authid flags (prefixed with *), otherwise * we are looking up the authzid flags * (no prefix) */ /* NOTE: Keep in sync with SASL_CU_<XXX> flags */ #define SASL_AUXPROP_VERIFY_AGAINST_HASH 0x10 #define SASL_AUXPROP_PLUG_VERSION 8 /* default name for auxprop plug-in entry point is "sasl_auxprop_init" * similar to sasl_server_plug_init model, except only returns one * sasl_auxprop_plug_t structure; */ typedef int sasl_auxprop_init_t(const sasl_utils_t *utils, int max_version, int *out_version, sasl_auxprop_plug_t **plug, const char *plugname); /* add an auxiliary property plug-in */ LIBSASL_API int sasl_auxprop_add_plugin(const char *plugname, sasl_auxprop_init_t *auxpropfunc); typedef void auxprop_info_callback_t (sasl_auxprop_plug_t *m, sasl_info_callback_stage_t stage, void *rock); /* Dump information about available auxprop plugins (separate functions are used for canon and server authentication plugins) */ LIBSASL_API int auxprop_plugin_info (const char *mech_list, auxprop_info_callback_t *info_cb, void *info_cb_rock); #ifdef __cplusplus } #endif #endif /* SASLPLUG_H */