diff options
Diffstat (limited to 'source3/nsswitch/winbind_nss_linux.c')
| -rw-r--r-- | source3/nsswitch/winbind_nss_linux.c | 862 |
1 files changed, 862 insertions, 0 deletions
diff --git a/source3/nsswitch/winbind_nss_linux.c b/source3/nsswitch/winbind_nss_linux.c new file mode 100644 index 0000000000..125bc8ccda --- /dev/null +++ b/source3/nsswitch/winbind_nss_linux.c @@ -0,0 +1,862 @@ +/* + Unix SMB/CIFS implementation. + + Windows NT Domain nsswitch module + + Copyright (C) Tim Potter 2000 + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this library; if not, write to the + Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. +*/ + +#include "winbind_client.h" + +/* Maximum number of users to pass back over the unix domain socket + per call. This is not a static limit on the total number of users + or groups returned in total. */ + +#define MAX_GETPWENT_USERS 250 +#define MAX_GETGRENT_USERS 250 + +/* Prototypes from wb_common.c */ + +extern int winbindd_fd; + +/* Allocate some space from the nss static buffer. The buffer and buflen + are the pointers passed in by the C library to the _nss_ntdom_* + functions. */ + +static char *get_static(char **buffer, int *buflen, int len) +{ + char *result; + + /* Error check. We return false if things aren't set up right, or + there isn't enough buffer space left. */ + + if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) { + return NULL; + } + + /* Return an index into the static buffer */ + + result = *buffer; + *buffer += len; + *buflen -= len; + + return result; +} + +/* I've copied the strtok() replacement function next_token() from + lib/util_str.c as I really don't want to have to link in any other + objects if I can possibly avoid it. */ + +BOOL next_token(char **ptr,char *buff,char *sep, size_t bufsize) +{ + char *s; + BOOL quoted; + size_t len=1; + + if (!ptr) return(False); + + s = *ptr; + + /* default to simple separators */ + if (!sep) sep = " \t\n\r"; + + /* find the first non sep char */ + while (*s && strchr(sep,*s)) s++; + + /* nothing left? */ + if (! *s) return(False); + + /* copy over the token */ + for (quoted = False; len < bufsize && *s && (quoted || !strchr(sep,*s)); s++) { + if (*s == '\"') { + quoted = !quoted; + } else { + len++; + *buff++ = *s; + } + } + + *ptr = (*s) ? s+1 : s; + *buff = 0; + + return(True); +} + + +/* Fill a pwent structure from a winbindd_response structure. We use + the static data passed to us by libc to put strings and stuff in. + Return NSS_STATUS_TRYAGAIN if we run out of memory. */ + +static NSS_STATUS fill_pwent(struct passwd *result, + struct winbindd_pw *pw, + char **buffer, size_t *buflen) +{ + /* User name */ + + if ((result->pw_name = + get_static(buffer, buflen, strlen(pw->pw_name) + 1)) == NULL) { + + /* Out of memory */ + + return NSS_STATUS_TRYAGAIN; + } + + strcpy(result->pw_name, pw->pw_name); + + /* Password */ + + if ((result->pw_passwd = + get_static(buffer, buflen, strlen(pw->pw_passwd) + 1)) == NULL) { + + /* Out of memory */ + + return NSS_STATUS_TRYAGAIN; + } + + strcpy(result->pw_passwd, pw->pw_passwd); + + /* [ug]id */ + + result->pw_uid = pw->pw_uid; + result->pw_gid = pw->pw_gid; + + /* GECOS */ + + if ((result->pw_gecos = + get_static(buffer, buflen, strlen(pw->pw_gecos) + 1)) == NULL) { + + /* Out of memory */ + + return NSS_STATUS_TRYAGAIN; + } + + strcpy(result->pw_gecos, pw->pw_gecos); + + /* Home directory */ + + if ((result->pw_dir = + get_static(buffer, buflen, strlen(pw->pw_dir) + 1)) == NULL) { + + /* Out of memory */ + + return NSS_STATUS_TRYAGAIN; + } + + strcpy(result->pw_dir, pw->pw_dir); + + /* Logon shell */ + + if ((result->pw_shell = + get_static(buffer, buflen, strlen(pw->pw_shell) + 1)) == NULL) { + + /* Out of memory */ + + return NSS_STATUS_TRYAGAIN; + } + + strcpy(result->pw_shell, pw->pw_shell); + + /* The struct passwd for Solaris has some extra fields which must + be initialised or nscd crashes. */ + +#if HAVE_PASSWD_PW_COMMENT + result->pw_comment = ""; +#endif + +#if HAVE_PASSWD_PW_AGE + result->pw_age = ""; +#endif + + return NSS_STATUS_SUCCESS; +} + +/* Fill a grent structure from a winbindd_response structure. We use + the static data passed to us by libc to put strings and stuff in. + Return NSS_STATUS_TRYAGAIN if we run out of memory. */ + +static NSS_STATUS fill_grent(struct group *result, struct winbindd_gr *gr, + char *gr_mem, char **buffer, size_t *buflen) +{ + fstring name; + int i; + char *tst; + + /* Group name */ + + if ((result->gr_name = + get_static(buffer, buflen, strlen(gr->gr_name) + 1)) == NULL) { + + /* Out of memory */ + + return NSS_STATUS_TRYAGAIN; + } + + strcpy(result->gr_name, gr->gr_name); + + /* Password */ + + if ((result->gr_passwd = + get_static(buffer, buflen, strlen(gr->gr_passwd) + 1)) == NULL) { + + /* Out of memory */ + + return NSS_STATUS_TRYAGAIN; + } + + strcpy(result->gr_passwd, gr->gr_passwd); + + /* gid */ + + result->gr_gid = gr->gr_gid; + + /* Group membership */ + + if ((gr->num_gr_mem < 0) || !gr_mem) { + gr->num_gr_mem = 0; + } + + /* this next value is a pointer to a pointer so let's align it */ + + /* Calculate number of extra bytes needed to align on pointer size boundry */ + if ((i = (unsigned long)(*buffer) % sizeof(char*)) != 0) + i = sizeof(char*) - i; + + if ((tst = get_static(buffer, buflen, ((gr->num_gr_mem + 1) * + sizeof(char *)+i))) == NULL) { + + /* Out of memory */ + + return NSS_STATUS_TRYAGAIN; + } + result->gr_mem = (char **)(tst + i); + + if (gr->num_gr_mem == 0) { + + /* Group is empty */ + + *(result->gr_mem) = NULL; + return NSS_STATUS_SUCCESS; + } + + /* Start looking at extra data */ + + i = 0; + + while(next_token((char **)&gr_mem, name, ",", sizeof(fstring))) { + + /* Allocate space for member */ + + if (((result->gr_mem)[i] = + get_static(buffer, buflen, strlen(name) + 1)) == NULL) { + + /* Out of memory */ + + return NSS_STATUS_TRYAGAIN; + } + + strcpy((result->gr_mem)[i], name); + i++; + } + + /* Terminate list */ + + (result->gr_mem)[i] = NULL; + + return NSS_STATUS_SUCCESS; +} + +/* + * NSS user functions + */ + +static struct winbindd_response getpwent_response; + +static int ndx_pw_cache; /* Current index into pwd cache */ +static int num_pw_cache; /* Current size of pwd cache */ + +/* Rewind "file pointer" to start of ntdom password database */ + +NSS_STATUS +_nss_winbind_setpwent(void) +{ +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: setpwent\n", getpid()); +#endif + + if (num_pw_cache > 0) { + ndx_pw_cache = num_pw_cache = 0; + free_response(&getpwent_response); + } + + return winbindd_request(WINBINDD_SETPWENT, NULL, NULL); +} + +/* Close ntdom password database "file pointer" */ + +NSS_STATUS +_nss_winbind_endpwent(void) +{ +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: endpwent\n", getpid()); +#endif + + if (num_pw_cache > 0) { + ndx_pw_cache = num_pw_cache = 0; + free_response(&getpwent_response); + } + + return winbindd_request(WINBINDD_ENDPWENT, NULL, NULL); +} + +/* Fetch the next password entry from ntdom password database */ + +NSS_STATUS +_nss_winbind_getpwent_r(struct passwd *result, char *buffer, + size_t buflen, int *errnop) +{ + NSS_STATUS ret; + struct winbindd_request request; + static int called_again; + +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: getpwent\n", getpid()); +#endif + + /* Return an entry from the cache if we have one, or if we are + called again because we exceeded our static buffer. */ + + if ((ndx_pw_cache < num_pw_cache) || called_again) { + goto return_result; + } + + /* Else call winbindd to get a bunch of entries */ + + if (num_pw_cache > 0) { + free_response(&getpwent_response); + } + + ZERO_STRUCT(request); + ZERO_STRUCT(getpwent_response); + + request.data.num_entries = MAX_GETPWENT_USERS; + + ret = winbindd_request(WINBINDD_GETPWENT, &request, + &getpwent_response); + + if (ret == NSS_STATUS_SUCCESS) { + struct winbindd_pw *pw_cache; + + /* Fill cache */ + + ndx_pw_cache = 0; + num_pw_cache = getpwent_response.data.num_entries; + + /* Return a result */ + + return_result: + + pw_cache = getpwent_response.extra_data; + + /* Check data is valid */ + + if (pw_cache == NULL) { + return NSS_STATUS_NOTFOUND; + } + + ret = fill_pwent(result, &pw_cache[ndx_pw_cache], + &buffer, &buflen); + + /* Out of memory - try again */ + + if (ret == NSS_STATUS_TRYAGAIN) { + called_again = True; + *errnop = errno = ERANGE; + return ret; + } + + *errnop = errno = 0; + called_again = False; + ndx_pw_cache++; + + /* If we've finished with this lot of results free cache */ + + if (ndx_pw_cache == num_pw_cache) { + ndx_pw_cache = num_pw_cache = 0; + free_response(&getpwent_response); + } + } + + return ret; +} + +/* Return passwd struct from uid */ + +NSS_STATUS +_nss_winbind_getpwuid_r(uid_t uid, struct passwd *result, char *buffer, + size_t buflen, int *errnop) +{ + NSS_STATUS ret; + static struct winbindd_response response; + struct winbindd_request request; + static int keep_response=0; + + /* If our static buffer needs to be expanded we are called again */ + if (!keep_response) { + + /* Call for the first time */ + + ZERO_STRUCT(response); + ZERO_STRUCT(request); + + request.data.uid = uid; + + ret = winbindd_request(WINBINDD_GETPWUID, &request, &response); + + if (ret == NSS_STATUS_SUCCESS) { + ret = fill_pwent(result, &response.data.pw, + &buffer, &buflen); + + if (ret == NSS_STATUS_TRYAGAIN) { + keep_response = True; + *errnop = errno = ERANGE; + return ret; + } + } + + } else { + + /* We've been called again */ + + ret = fill_pwent(result, &response.data.pw, &buffer, &buflen); + + if (ret == NSS_STATUS_TRYAGAIN) { + keep_response = True; + *errnop = errno = ERANGE; + return ret; + } + + keep_response = False; + *errnop = errno = 0; + } + + free_response(&response); + return ret; +} + +/* Return passwd struct from username */ + +NSS_STATUS +_nss_winbind_getpwnam_r(const char *name, struct passwd *result, char *buffer, + size_t buflen, int *errnop) +{ + NSS_STATUS ret; + static struct winbindd_response response; + struct winbindd_request request; + static int keep_response; + +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: getpwnam %s\n", getpid(), name); +#endif + + /* If our static buffer needs to be expanded we are called again */ + + if (!keep_response) { + + /* Call for the first time */ + + ZERO_STRUCT(response); + ZERO_STRUCT(request); + + strncpy(request.data.username, name, + sizeof(request.data.username) - 1); + request.data.username + [sizeof(request.data.username) - 1] = '\0'; + + ret = winbindd_request(WINBINDD_GETPWNAM, &request, &response); + + if (ret == NSS_STATUS_SUCCESS) { + ret = fill_pwent(result, &response.data.pw, &buffer, + &buflen); + + if (ret == NSS_STATUS_TRYAGAIN) { + keep_response = True; + *errnop = errno = ERANGE; + return ret; + } + } + + } else { + + /* We've been called again */ + + ret = fill_pwent(result, &response.data.pw, &buffer, &buflen); + + if (ret == NSS_STATUS_TRYAGAIN) { + keep_response = True; + *errnop = errno = ERANGE; + return ret; + } + + keep_response = False; + *errnop = errno = 0; + } + + free_response(&response); + return ret; +} + +/* + * NSS group functions + */ + +static struct winbindd_response getgrent_response; + +static int ndx_gr_cache; /* Current index into grp cache */ +static int num_gr_cache; /* Current size of grp cache */ + +/* Rewind "file pointer" to start of ntdom group database */ + +NSS_STATUS +_nss_winbind_setgrent(void) +{ +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: setgrent\n", getpid()); +#endif + + if (num_gr_cache > 0) { + ndx_gr_cache = num_gr_cache = 0; + free_response(&getgrent_response); + } + + return winbindd_request(WINBINDD_SETGRENT, NULL, NULL); +} + +/* Close "file pointer" for ntdom group database */ + +NSS_STATUS +_nss_winbind_endgrent(void) +{ +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: endgrent\n", getpid()); +#endif + + if (num_gr_cache > 0) { + ndx_gr_cache = num_gr_cache = 0; + free_response(&getgrent_response); + } + + return winbindd_request(WINBINDD_ENDGRENT, NULL, NULL); +} + +/* Get next entry from ntdom group database */ + +static NSS_STATUS +winbind_getgrent(enum winbindd_cmd cmd, + struct group *result, + char *buffer, size_t buflen, int *errnop) +{ + NSS_STATUS ret; + static struct winbindd_request request; + static int called_again; + + +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: getgrent\n", getpid()); +#endif + + /* Return an entry from the cache if we have one, or if we are + called again because we exceeded our static buffer. */ + + if ((ndx_gr_cache < num_gr_cache) || called_again) { + goto return_result; + } + + /* Else call winbindd to get a bunch of entries */ + + if (num_gr_cache > 0) { + free_response(&getgrent_response); + } + + ZERO_STRUCT(request); + ZERO_STRUCT(getgrent_response); + + request.data.num_entries = MAX_GETGRENT_USERS; + + ret = winbindd_request(cmd, &request, + &getgrent_response); + + if (ret == NSS_STATUS_SUCCESS) { + struct winbindd_gr *gr_cache; + int mem_ofs; + + /* Fill cache */ + + ndx_gr_cache = 0; + num_gr_cache = getgrent_response.data.num_entries; + + /* Return a result */ + + return_result: + + gr_cache = getgrent_response.extra_data; + + /* Check data is valid */ + + if (gr_cache == NULL) { + return NSS_STATUS_NOTFOUND; + } + + /* Fill group membership. The offset into the extra data + for the group membership is the reported offset plus the + size of all the winbindd_gr records returned. */ + + mem_ofs = gr_cache[ndx_gr_cache].gr_mem_ofs + + num_gr_cache * sizeof(struct winbindd_gr); + + ret = fill_grent(result, &gr_cache[ndx_gr_cache], + ((char *)getgrent_response.extra_data)+mem_ofs, + &buffer, &buflen); + + /* Out of memory - try again */ + + if (ret == NSS_STATUS_TRYAGAIN) { + called_again = True; + *errnop = errno = ERANGE; + return ret; + } + + *errnop = 0; + called_again = False; + ndx_gr_cache++; + + /* If we've finished with this lot of results free cache */ + + if (ndx_gr_cache == num_gr_cache) { + ndx_gr_cache = num_gr_cache = 0; + free_response(&getgrent_response); + } + } + + return ret; +} + + +NSS_STATUS +_nss_winbind_getgrent_r(struct group *result, + char *buffer, size_t buflen, int *errnop) +{ + return winbind_getgrent(WINBINDD_GETGRENT, result, buffer, buflen, errnop); +} + +NSS_STATUS +_nss_winbind_getgrlst_r(struct group *result, + char *buffer, size_t buflen, int *errnop) +{ + return winbind_getgrent(WINBINDD_GETGRLST, result, buffer, buflen, errnop); +} + +/* Return group struct from group name */ + +NSS_STATUS +_nss_winbind_getgrnam_r(const char *name, + struct group *result, char *buffer, + size_t buflen, int *errnop) +{ + NSS_STATUS ret; + static struct winbindd_response response; + struct winbindd_request request; + static int keep_response; + +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: getgrnam %s\n", getpid(), name); +#endif + + /* If our static buffer needs to be expanded we are called again */ + + if (!keep_response) { + + /* Call for the first time */ + + ZERO_STRUCT(request); + ZERO_STRUCT(response); + + strncpy(request.data.groupname, name, + sizeof(request.data.groupname)); + request.data.groupname + [sizeof(request.data.groupname) - 1] = '\0'; + + ret = winbindd_request(WINBINDD_GETGRNAM, &request, &response); + + if (ret == NSS_STATUS_SUCCESS) { + ret = fill_grent(result, &response.data.gr, + response.extra_data, + &buffer, &buflen); + + if (ret == NSS_STATUS_TRYAGAIN) { + keep_response = True; + *errnop = errno = ERANGE; + return ret; + } + } + + } else { + + /* We've been called again */ + + ret = fill_grent(result, &response.data.gr, + response.extra_data, &buffer, &buflen); + + if (ret == NSS_STATUS_TRYAGAIN) { + keep_response = True; + *errnop = errno = ERANGE; + return ret; + } + + keep_response = False; + *errnop = 0; + } + + free_response(&response); + return ret; +} + +/* Return group struct from gid */ + +NSS_STATUS +_nss_winbind_getgrgid_r(gid_t gid, + struct group *result, char *buffer, + size_t buflen, int *errnop) +{ + NSS_STATUS ret; + static struct winbindd_response response; + struct winbindd_request request; + static int keep_response; + +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: getgrgid %d\n", getpid(), gid); +#endif + + /* If our static buffer needs to be expanded we are called again */ + + if (!keep_response) { + + /* Call for the first time */ + + ZERO_STRUCT(request); + ZERO_STRUCT(response); + + request.data.gid = gid; + + ret = winbindd_request(WINBINDD_GETGRGID, &request, &response); + + if (ret == NSS_STATUS_SUCCESS) { + + ret = fill_grent(result, &response.data.gr, + response.extra_data, + &buffer, &buflen); + + if (ret == NSS_STATUS_TRYAGAIN) { + keep_response = True; + *errnop = errno = ERANGE; + return ret; + } + } + + } else { + + /* We've been called again */ + + ret = fill_grent(result, &response.data.gr, + response.extra_data, &buffer, &buflen); + + if (ret == NSS_STATUS_TRYAGAIN) { + keep_response = True; + *errnop = errno = ERANGE; + return ret; + } + + keep_response = False; + *errnop = 0; + } + + free_response(&response); + return ret; +} + +/* Initialise supplementary groups */ + +NSS_STATUS +_nss_winbind_initgroups_dyn(char *user, gid_t group, long int *start, + long int *size, gid_t **groups, long int limit, + int *errnop) +{ + NSS_STATUS ret; + struct winbindd_request request; + struct winbindd_response response; + int i; + +#ifdef DEBUG_NSS + fprintf(stderr, "[%5d]: initgroups %s (%d)\n", getpid(), + user, group); +#endif + + ZERO_STRUCT(request); + ZERO_STRUCT(response); + + strncpy(request.data.username, user, + sizeof(request.data.username) - 1); + + ret = winbindd_request(WINBINDD_GETGROUPS, &request, &response); + + if (ret == NSS_STATUS_SUCCESS) { + int num_gids = response.data.num_entries; + gid_t *gid_list = (gid_t *)response.extra_data; + + /* Copy group list to client */ + + for (i = 0; i < num_gids; i++) { + + /* Skip primary group */ + + if (gid_list[i] == group) continue; + + /* Add to buffer */ + + if (*start == *size && limit <= 0) { + (*groups) = realloc( + (*groups), (2 * (*size) + 1) * sizeof(**groups)); + if (! *groups) goto done; + *size = 2 * (*size) + 1; + } + + if (*start == *size) goto done; + + (*groups)[*start] = gid_list[i]; + *start += 1; + + /* Filled buffer? */ + + if (*start == limit) goto done; + } + } + + /* Back to your regularly scheduled programming */ + + done: + return ret; +} |