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|
/* MODULE HTAAProt.c
* PROTECTION FILE PARSING MODULE
*
* AUTHORS:
* AL Ari Luotonen luotonen@dxcern.cern.ch
* MD Mark Donszelmann duns@vxdeop.cern.ch
*
* HISTORY:
* 20 Oct 93 AL Now finds uid/gid for nobody/nogroup by name
* (doesn't use default 65534 right away).
* Also understands negative uids/gids.
* 14 Nov 93 MD Added VMS compatibility
*
* BUGS:
*
*
*/
#include <HTUtils.h>
#ifndef VMS
#ifndef NOUSERS
#include <pwd.h> /* Unix password file routine: getpwnam() */
#include <grp.h> /* Unix group file routine: getgrnam() */
#endif /* NOUSERS */
#endif /* not VMS */
#include <HTAAUtil.h>
#include <HTLex.h> /* Lexical analysor */
#include <HTAAProt.h> /* Implemented here */
#include <LYUtils.h>
#include <LYLeaks.h>
#define NOBODY 65534 /* -2 in 16-bit environment */
#define NONESUCH 65533 /* -3 in 16-bit environment */
/*
* Protection setup caching
*/
typedef struct {
char *prot_filename;
HTAAProt *prot;
} HTAAProtCache;
static HTList *prot_cache = NULL; /* Protection setup cache. */
static HTAAProt *default_prot = NULL; /* Default protection. */
static HTAAProt *current_prot = NULL; /* Current protection mode */
/* which is set up by callbacks */
/* from the rule system when */
/* a "protect" rule is matched. */
#ifndef NOUSERS
/* static isNumber()
* DOES A CHARACTER STRING REPRESENT A NUMBER
*/
static BOOL isNumber(const char *s)
{
const char *cur = s;
if (isEmpty(s))
return NO;
if (*cur == '-')
cur++; /* Allow initial minus sign in a number */
while (*cur) {
if (*cur < '0' || *cur > '9')
return NO;
cur++;
}
return YES;
}
#endif /* !NOUSERS */
#if defined (NOUSERS)
/* PUBLIC HTAA_getUidName()
* GET THE USER ID NAME (VMS ONLY)
* ON ENTRY:
* No arguments.
*
* ON EXIT:
* returns the user name
* Default is "" (nobody).
*/
const char *HTAA_getUidName(void)
{
if (current_prot && current_prot->uid_name
&& (0 != strcmp(current_prot->uid_name, "nobody")))
return (current_prot->uid_name);
else
return ("");
}
/* PUBLIC HTAA_getFileName
* GET THE FILENAME (VMS ONLY)
* ON ENTRY:
* No arguments.
*
* ON EXIT:
* returns the filename
*/
const char *HTAA_getFileName(void)
{
if (current_prot && current_prot->filename)
return (current_prot->filename);
else
return ("");
}
#else /* not VMS */
/* PUBLIC HTAA_getUid()
* GET THE USER ID TO CHANGE THE PROCESS UID TO
* ON ENTRY:
* No arguments.
*
* ON EXIT:
* returns the uid number to give to setuid() system call.
* Default is 65534 (nobody).
*/
int HTAA_getUid(void)
{
int uid;
if (current_prot && current_prot->uid_name) {
if (isNumber(current_prot->uid_name)) {
uid = atoi(current_prot->uid_name);
if ((*HTAA_UidToName(uid)) != '\0') {
return uid;
}
} else { /* User name (not a number) */
if ((uid = HTAA_NameToUid(current_prot->uid_name)) != NONESUCH) {
return uid;
}
}
}
/*
* Ok, then let's get uid for nobody.
*/
if ((uid = HTAA_NameToUid("nobody")) != NONESUCH) {
return uid;
}
/*
* Ok, then use default.
*/
return NOBODY; /* nobody */
}
/* PUBLIC HTAA_getGid()
* GET THE GROUP ID TO CHANGE THE PROCESS GID TO
* ON ENTRY:
* No arguments.
*
* ON EXIT:
* returns the uid number to give to setgid() system call.
* Default is 65534 (nogroup).
*/
int HTAA_getGid(void)
{
int gid;
if (current_prot && current_prot->gid_name) {
if (isNumber(current_prot->gid_name)) {
gid = atoi(current_prot->gid_name);
if (*HTAA_GidToName(gid) != '\0') {
return gid;
}
} else { /* Group name (not number) */
if ((gid = HTAA_NameToGid(current_prot->gid_name)) != NONESUCH) {
return gid;
}
}
}
/*
* Ok, then let's get gid for nogroup.
*/
if ((gid = HTAA_NameToGid("nogroup")) != NONESUCH) {
return gid;
}
/*
* Ok, then use default.
*/
return NOBODY; /* nogroup */
}
#endif /* not VMS */
/* static HTAA_setIds()
* SET UID AND GID (AS NAMES OR NUMBERS)
* TO HTAAProt STRUCTURE
* ON ENTRY:
* prot destination.
* ids is a string like "james.www" or "1422.69" etc.
* giving uid and gid.
*
* ON EXIT:
* returns nothing.
*/
static void HTAA_setIds(HTAAProt *prot, const char *ids)
{
if (ids) {
char *local_copy = NULL;
char *point;
StrAllocCopy(local_copy, ids);
point = strchr(local_copy, '.');
if (point) {
*(point++) = (char) 0;
StrAllocCopy(prot->gid_name, point);
} else {
StrAllocCopy(prot->gid_name, "nogroup");
}
StrAllocCopy(prot->uid_name, local_copy);
FREE(local_copy);
} else {
StrAllocCopy(prot->uid_name, "nobody");
StrAllocCopy(prot->gid_name, "nogroup");
}
}
/* static HTAA_parseProtFile()
* PARSE A PROTECTION SETUP FILE AND
* PUT THE RESULT IN A HTAAProt STRUCTURE
* ON ENTRY:
* prot destination structure.
* fp open protection file.
*
* ON EXIT:
* returns nothing.
*/
static void HTAA_parseProtFile(HTAAProt *prot, FILE *fp)
{
if (prot && fp) {
LexItem lex_item;
char *fieldname = NULL;
while (LEX_EOF != (lex_item = lex(fp))) {
while (lex_item == LEX_REC_SEP) /* Ignore empty lines */
lex_item = lex(fp);
if (lex_item == LEX_EOF) /* End of file */
break;
if (lex_item == LEX_ALPH_STR) { /* Valid setup record */
StrAllocCopy(fieldname, HTlex_buffer);
if (LEX_FIELD_SEP != (lex_item = lex(fp)))
unlex(lex_item); /* If someone wants to use colon */
/* after field name it's ok, but */
/* not required. Here we read it. */
if (0 == strncasecomp(fieldname, "Auth", 4)) {
lex_item = lex(fp);
while (lex_item == LEX_ALPH_STR) {
HTAAScheme scheme = HTAAScheme_enum(HTlex_buffer);
if (scheme != HTAA_UNKNOWN) {
if (!prot->valid_schemes)
prot->valid_schemes = HTList_new();
HTList_addObject(prot->valid_schemes, (void *) scheme);
CTRACE((tfp, "%s %s `%s'\n",
"HTAA_parseProtFile: valid",
"authentication scheme:",
HTAAScheme_name(scheme)));
} else {
CTRACE((tfp, "%s %s `%s'\n",
"HTAA_parseProtFile: unknown",
"authentication scheme:",
HTlex_buffer));
}
if (LEX_ITEM_SEP != (lex_item = lex(fp)))
break;
/*
* Here lex_item == LEX_ITEM_SEP; after item separator
* it is ok to have one or more newlines (LEX_REC_SEP)
* and they are ignored (continuation line).
*/
do {
lex_item = lex(fp);
} while (lex_item == LEX_REC_SEP);
} /* while items in list */
}
/* if "Authenticate" */
else if (0 == strncasecomp(fieldname, "mask", 4)) {
prot->mask_group = HTAA_parseGroupDef(fp);
lex_item = LEX_REC_SEP; /*groupdef parser read this already */
if (TRACE) {
if (prot->mask_group) {
fprintf(tfp,
"HTAA_parseProtFile: Mask group:\n");
HTAA_printGroupDef(prot->mask_group);
} else
fprintf(tfp,
"HTAA_parseProtFile: Mask group syntax error\n");
}
}
/* if "Mask" */
else { /* Just a name-value pair, put it to assoclist */
if (LEX_ALPH_STR == (lex_item = lex(fp))) {
if (!prot->values)
prot->values = HTAssocList_new();
HTAssocList_add(prot->values, fieldname, HTlex_buffer);
lex_item = lex(fp); /* Read record separator */
CTRACE((tfp, "%s `%s' bound to value `%s'\n",
"HTAA_parseProtFile: Name",
fieldname, HTlex_buffer));
}
} /* else name-value pair */
}
/* if valid field */
if (lex_item != LEX_EOF && lex_item != LEX_REC_SEP) {
CTRACE((tfp, "%s %s %d (that line ignored)\n",
"HTAA_parseProtFile: Syntax error",
"in protection setup file at line",
HTlex_line));
do {
lex_item = lex(fp);
} while (lex_item != LEX_EOF && lex_item != LEX_REC_SEP);
} /* if syntax error */
} /* while not end-of-file */
FREE(fieldname);
} /* if valid parameters */
}
/* static HTAAProt_new()
* ALLOCATE A NEW HTAAProt STRUCTURE AND
* INITIALIZE IT FROM PROTECTION SETUP FILE
* ON ENTRY:
* cur_docname current filename after rule translations.
* prot_filename protection setup file name.
* If NULL, not an error.
* ids Uid and gid names or numbers,
* examples:
* james ( <=> james.nogroup)
* .www ( <=> nobody.www)
* james.www
* james.69
* 1422.69
* 1422.www
*
* May be NULL, defaults to nobody.nogroup.
* Should be NULL, if prot_file is NULL.
*
* ON EXIT:
* returns returns a new and initialized protection
* setup structure.
* If setup file is already read in (found
* in cache), only sets uid_name and gid
* fields, and returns that.
*/
static HTAAProt *HTAAProt_new(const char *cur_docname,
const char *prot_filename,
const char *ids)
{
HTList *cur = prot_cache;
HTAAProtCache *cache_item = NULL;
HTAAProt *prot;
FILE *fp;
if (!prot_cache)
prot_cache = HTList_new();
while (NULL != (cache_item = (HTAAProtCache *) HTList_nextObject(cur))) {
if (!strcmp(cache_item->prot_filename, prot_filename))
break;
}
if (cache_item) {
prot = cache_item->prot;
CTRACE((tfp, "%s `%s' already in cache\n",
"HTAAProt_new: Protection file", prot_filename));
} else {
CTRACE((tfp, "HTAAProt_new: Loading protection file `%s'\n",
prot_filename));
if ((prot = typecalloc(HTAAProt)) == 0)
outofmem(__FILE__, "HTAAProt_new");
prot->ctemplate = NULL;
prot->filename = NULL;
prot->uid_name = NULL;
prot->gid_name = NULL;
prot->valid_schemes = HTList_new();
prot->mask_group = NULL; /* Masking disabled by defaults */
prot->values = HTAssocList_new();
if (prot_filename && NULL != (fp = fopen(prot_filename, TXT_R))) {
HTAA_parseProtFile(prot, fp);
fclose(fp);
if ((cache_item = typecalloc(HTAAProtCache)) == 0)
outofmem(__FILE__, "HTAAProt_new");
cache_item->prot = prot;
cache_item->prot_filename = NULL;
StrAllocCopy(cache_item->prot_filename, prot_filename);
HTList_addObject(prot_cache, (void *) cache_item);
} else {
CTRACE((tfp, "HTAAProt_new: %s `%s'\n",
"Unable to open protection setup file",
NONNULL(prot_filename)));
}
}
if (cur_docname)
StrAllocCopy(prot->filename, cur_docname);
HTAA_setIds(prot, ids);
return prot;
}
/* PUBLIC HTAA_setDefaultProtection()
* SET THE DEFAULT PROTECTION MODE
* (called by rule system when a
* "defprot" rule is matched)
* ON ENTRY:
* cur_docname is the current result of rule translations.
* prot_filename is the protection setup file (second argument
* for "defprot" rule, optional)
* ids contains user and group names separated by
* a dot, corresponding to the uid
* gid under which the server should run,
* default is "nobody.nogroup" (third argument
* for "defprot" rule, optional; can be given
* only if protection setup file is also given).
*
* ON EXIT:
* returns nothing.
* Sets the module-wide variable default_prot.
*/
void HTAA_setDefaultProtection(const char *cur_docname,
const char *prot_filename,
const char *ids)
{
default_prot = NULL; /* Not free()'d because this is in cache */
if (prot_filename) {
default_prot = HTAAProt_new(cur_docname, prot_filename, ids);
} else {
CTRACE((tfp, "%s %s\n",
"HTAA_setDefaultProtection: ERROR: Protection file",
"not specified (obligatory for DefProt rule)!!\n"));
}
}
/* PUBLIC HTAA_setCurrentProtection()
* SET THE CURRENT PROTECTION MODE
* (called by rule system when a
* "protect" rule is matched)
* ON ENTRY:
* cur_docname is the current result of rule translations.
* prot_filename is the protection setup file (second argument
* for "protect" rule, optional)
* ids contains user and group names separated by
* a dot, corresponding to the uid
* gid under which the server should run,
* default is "nobody.nogroup" (third argument
* for "protect" rule, optional; can be given
* only if protection setup file is also given).
*
* ON EXIT:
* returns nothing.
* Sets the module-wide variable current_prot.
*/
void HTAA_setCurrentProtection(const char *cur_docname,
const char *prot_filename,
const char *ids)
{
current_prot = NULL; /* Not free()'d because this is in cache */
if (prot_filename) {
current_prot = HTAAProt_new(cur_docname, prot_filename, ids);
} else {
if (default_prot) {
current_prot = default_prot;
HTAA_setIds(current_prot, ids);
CTRACE((tfp, "%s %s %s\n",
"HTAA_setCurrentProtection: Protection file",
"not specified for Protect rule",
"-- using default protection"));
} else {
CTRACE((tfp, "%s %s %s\n",
"HTAA_setCurrentProtection: ERROR: Protection",
"file not specified for Protect rule, and",
"default protection is not set!!"));
}
}
}
/* PUBLIC HTAA_getCurrentProtection()
* GET CURRENT PROTECTION SETUP STRUCTURE
* (this is set up by callbacks made from
* the rule system when matching "protect"
* (and "defprot") rules)
* ON ENTRY:
* HTTranslate() must have been called before calling
* this function.
*
* ON EXIT:
* returns a HTAAProt structure representing the
* protection setup of the HTTranslate()'d file.
* This must not be free()'d.
*/
HTAAProt *HTAA_getCurrentProtection(void)
{
return current_prot;
}
/* PUBLIC HTAA_getDefaultProtection()
* GET DEFAULT PROTECTION SETUP STRUCTURE
* AND SET IT TO CURRENT PROTECTION
* (this is set up by callbacks made from
* the rule system when matching "defprot"
* rules)
* ON ENTRY:
* HTTranslate() must have been called before calling
* this function.
*
* ON EXIT:
* returns a HTAAProt structure representing the
* default protection setup of the HTTranslate()'d
* file (if HTAA_getCurrentProtection() returned
* NULL, i.e., if there is no "protect" rule
* but ACL exists, and we need to know default
* protection settings).
* This must not be free()'d.
* IMPORTANT:
* As a side-effect this tells the protection system that
* the file is in fact protected and sets the current
* protection mode to default.
*/
HTAAProt *HTAA_getDefaultProtection(void)
{
if (!current_prot) {
current_prot = default_prot;
default_prot = NULL;
}
return current_prot;
}
/* SERVER INTERNAL HTAA_clearProtections()
* CLEAR DOCUMENT PROTECTION MODE
* (ALSO DEFAULT PROTECTION)
* (called by the rule system)
* ON ENTRY:
* No arguments.
*
* ON EXIT:
* returns nothing.
* Frees the memory used by protection information.
*/
void HTAA_clearProtections(void)
{
current_prot = NULL; /* These are not freed because */
default_prot = NULL; /* they are actually in cache. */
}
typedef struct {
char *name;
int user;
} USER_DATA;
#ifndef NOUSERS
static HTList *known_grp = NULL;
static HTList *known_pwd = NULL;
static BOOL uidgid_cache_inited = NO;
#endif
#ifdef LY_FIND_LEAKS
static void clear_uidgid_cache(void)
{
#ifndef NOUSERS
USER_DATA *data;
if (known_grp) {
while ((data = HTList_removeLastObject(known_grp)) != NULL) {
FREE(data->name);
FREE(data);
}
FREE(known_grp);
}
if (known_pwd) {
while ((data = HTList_removeLastObject(known_pwd)) != NULL) {
FREE(data->name);
FREE(data);
}
FREE(known_pwd);
}
#endif
}
#endif /* LY_FIND_LEAKS */
#ifndef NOUSERS
static void save_gid_info(const char *name, int user)
{
USER_DATA *data = typecalloc(USER_DATA);
if (!data)
return;
if (!known_grp) {
known_grp = HTList_new();
if (!uidgid_cache_inited) {
#ifdef LY_FIND_LEAKS
atexit(clear_uidgid_cache);
#endif
uidgid_cache_inited = YES;
}
}
StrAllocCopy(data->name, name);
data->user = user;
HTList_addObject(known_grp, data);
}
#endif /* NOUSERS */
#ifndef NOUSERS
static void save_uid_info(const char *name, int user)
{
USER_DATA *data = typecalloc(USER_DATA);
if (!data)
return;
if (!known_pwd) {
known_pwd = HTList_new();
if (!uidgid_cache_inited) {
#ifdef LY_FIND_LEAKS
atexit(clear_uidgid_cache);
#endif
uidgid_cache_inited = YES;
}
}
StrAllocCopy(data->name, name);
data->user = user;
HTList_addObject(known_pwd, data);
}
#endif /* !NOUSERS */
/* PUBLIC HTAA_UidToName
* GET THE USER NAME
* ON ENTRY:
* The user-id
*
* ON EXIT:
* returns the user name, or an empty string if not found.
*/
const char *HTAA_UidToName(int uid)
{
#ifndef NOUSERS
struct passwd *pw;
HTList *me = known_pwd;
while (HTList_nextObject(me)) {
USER_DATA *data = (USER_DATA *) (me->object);
if (uid == data->user)
return data->name;
}
if ((pw = getpwuid(uid)) != 0
&& pw->pw_name != 0) {
CTRACE((tfp, "%s(%d) returned (%s:%d:...)\n",
"HTAA_UidToName: getpwuid",
uid,
pw->pw_name, (int) pw->pw_uid));
save_uid_info(pw->pw_name, (int) pw->pw_uid);
return pw->pw_name;
}
#endif
return "";
}
/* PUBLIC HTAA_NameToUid
* GET THE USER ID
* ON ENTRY:
* The user-name
*
* ON EXIT:
* returns the user id, or NONESUCH if not found.
*/
int HTAA_NameToUid(const char *name)
{
#ifndef NOUSERS
struct passwd *pw;
HTList *me = known_pwd;
while (HTList_nextObject(me)) {
USER_DATA *data = (USER_DATA *) (me->object);
if (!strcmp(name, data->name))
return data->user;
}
if ((pw = getpwnam(name)) != 0) {
CTRACE((tfp, "%s(%s) returned (%s:%d:...)\n",
"HTAA_NameToUid: getpwnam",
name,
pw->pw_name, (int) pw->pw_uid));
save_uid_info(pw->pw_name, (int) pw->pw_uid);
return (int) pw->pw_uid;
}
#endif
return NONESUCH;
}
/* PUBLIC HTAA_GidToName
* GET THE GROUP NAME
* ON ENTRY:
* The group-id
*
* ON EXIT:
* returns the group name, or an empty string if not found.
*/
const char *HTAA_GidToName(int gid)
{
#ifndef NOUSERS
struct group *gr;
HTList *me = known_grp;
while (HTList_nextObject(me)) {
USER_DATA *data = (USER_DATA *) (me->object);
if (gid == data->user)
return data->name;
}
if ((gr = getgrgid(gid)) != 0
&& gr->gr_name != 0) {
CTRACE((tfp, "%s(%d) returned (%s:%d:...)\n",
"HTAA_GidToName: getgrgid",
gid,
gr->gr_name, (int) gr->gr_gid));
save_gid_info(gr->gr_name, (int) gr->gr_gid);
return gr->gr_name;
}
#endif
return "";
}
/* PUBLIC HTAA_NameToGid
* GET THE GROUP ID
* ON ENTRY:
* The group-name
*
* ON EXIT:
* returns the group id, or NONESUCH if not found.
*/
int HTAA_NameToGid(const char *name)
{
#ifndef NOUSERS
struct group *gr;
HTList *me = known_grp;
while (HTList_nextObject(me)) {
USER_DATA *data = (USER_DATA *) (me->object);
if (!strcmp(name, data->name))
return data->user;
}
if ((gr = getgrnam(name)) != 0) {
CTRACE((tfp, "%s(%s) returned (%s:%d:...)\n",
"HTAA_NameToGid: getgrnam",
name,
gr->gr_name, (int) gr->gr_gid));
save_gid_info(gr->gr_name, (int) gr->gr_gid);
return (int) gr->gr_gid;
}
#endif
return NONESUCH;
}
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