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|
/*
SSSD
User tools
Copyright (C) Stephen Gallagher <sgallagh@redhat.com> 2009
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <pwd.h>
#include <pcre.h>
#include <errno.h>
#include <talloc.h>
#include "confdb/confdb.h"
#include "util/util.h"
#include "responder/common/responder.h"
#ifdef HAVE_LIBPCRE_LESSER_THAN_7
#define NAME_DOMAIN_PATTERN_OPTIONS (PCRE_EXTENDED)
#else
#define NAME_DOMAIN_PATTERN_OPTIONS (PCRE_DUPNAMES | PCRE_EXTENDED)
#endif
char *get_username_from_uid(TALLOC_CTX *mem_ctx, uid_t uid)
{
char *username;
struct passwd *pwd;
pwd = getpwuid(uid);
if (!pwd) return NULL;
username = talloc_strdup(mem_ctx, pwd->pw_name);
return username;
}
/* Function returns given realm name as new uppercase string */
char *get_uppercase_realm(TALLOC_CTX *memctx, const char *name)
{
char *realm;
char *c;
realm = talloc_strdup(memctx, name);
if (!realm) {
return NULL;
}
c = realm;
while(*c != '\0') {
*c = toupper(*c);
c++;
}
return realm;
}
static int sss_names_ctx_destructor(struct sss_names_ctx *snctx)
{
if (snctx->re) {
pcre_free(snctx->re);
snctx->re = NULL;
}
return 0;
}
#define IPA_AD_DEFAULT_RE "(((?P<domain>[^\\\\]+)\\\\(?P<name>.+$))|" \
"((?P<name>[^@]+)@(?P<domain>.+$))|" \
"(^(?P<name>[^@\\\\]+)$))"
static errno_t get_id_provider_default_re(TALLOC_CTX *mem_ctx,
struct confdb_ctx *cdb,
const char *conf_path,
char **re_pattern)
{
#ifdef HAVE_LIBPCRE_LESSER_THAN_7
DEBUG(SSSDBG_MINOR_FAILURE,
("The libpcre version on this system is too old. Only "
"the user@DOMAIN name fully qualified name format will "
"be supported\n"));
*re_pattern = NULL;
return EOK;
#else
int ret;
size_t c;
char *id_provider = NULL;
struct provider_default_re {
const char *name;
const char *re;
} provider_default_re[] = {{"ipa", IPA_AD_DEFAULT_RE},
{"ad", IPA_AD_DEFAULT_RE},
{NULL, NULL}};
ret = confdb_get_string(cdb, mem_ctx, conf_path, CONFDB_DOMAIN_ID_PROVIDER,
NULL, &id_provider);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("Failed to read ID provider " \
"from conf db.\n"));
goto done;
}
if (id_provider == NULL) {
*re_pattern = NULL;
} else {
for (c = 0; provider_default_re[c].name != NULL; c++) {
if (strcmp(id_provider, provider_default_re[c].name) == 0) {
*re_pattern = talloc_strdup(mem_ctx, provider_default_re[c].re);
if (*re_pattern == NULL) {
DEBUG(SSSDBG_OP_FAILURE, ("talloc_strdup failed.\n"));
ret = ENOMEM;
goto done;
}
break;
}
}
}
ret = EOK;
done:
talloc_free(id_provider);
return ret;
#endif
}
static errno_t sss_fqnames_init(struct sss_names_ctx *nctx, const char *fq_fmt)
{
struct pattern_desc {
const char *pattern;
const char *desc;
int flag;
};
struct pattern_desc fqname_patterns[] = {
{ "%1$s", "user name", FQ_FMT_NAME },
{ "%2$s", "domain name", FQ_FMT_DOMAIN },
{ "%3$s", "domain flat name", FQ_FMT_FLAT_NAME },
{ NULL, NULL, 0 }
};
nctx->fq_fmt = talloc_strdup(nctx, fq_fmt);
if (nctx->fq_fmt == NULL) {
return ENOMEM;
}
DEBUG(SSSDBG_CONF_SETTINGS, ("Using fq format [%s].\n", nctx->fq_fmt));
/* Fail if the name specifier is missing and warn if the domain
* specifier is missing
*/
if (strstr(fq_fmt, fqname_patterns[0].pattern) == NULL) {
DEBUG(SSSDBG_OP_FAILURE,
("Username pattern not found in [%s]\n", nctx->fq_fmt));
return ENOENT;
}
nctx->fq_flags = FQ_FMT_NAME;
for (int i = 1; fqname_patterns[i].pattern; i++) {
char *s;
s = strstr(fq_fmt, fqname_patterns[i].pattern);
if (s == NULL) {
/* Append the format specifier */
nctx->fq_fmt = talloc_strdup_append(nctx->fq_fmt,
fqname_patterns[i].pattern);
if (nctx->fq_fmt == NULL) {
return ENOMEM;
}
continue;
}
DEBUG(SSSDBG_CONF_SETTINGS,
("Found the pattern for %s\n", fqname_patterns[i].desc));
nctx->fq_flags |= fqname_patterns[i].flag;
}
return EOK;
}
int sss_names_init_from_args(TALLOC_CTX *mem_ctx, const char *re_pattern,
const char *fq_fmt, struct sss_names_ctx **out)
{
struct sss_names_ctx *ctx;
const char *errstr;
int errval;
int errpos;
int ret;
ctx = talloc_zero(mem_ctx, struct sss_names_ctx);
if (!ctx) return ENOMEM;
talloc_set_destructor(ctx, sss_names_ctx_destructor);
ctx->re_pattern = talloc_strdup(ctx, re_pattern);
if (ctx->re_pattern == NULL) {
ret = ENOMEM;
goto done;
}
DEBUG(SSSDBG_CONF_SETTINGS, ("Using re [%s].\n", ctx->re_pattern));
ret = sss_fqnames_init(ctx, fq_fmt);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("Could not check the FQ names format"
"[%d]: %s\n", ret, sss_strerror(ret)));
goto done;
}
ctx->re = pcre_compile2(ctx->re_pattern,
NAME_DOMAIN_PATTERN_OPTIONS,
&errval, &errstr, &errpos, NULL);
if (!ctx->re) {
DEBUG(1, ("Invalid Regular Expression pattern at position %d."
" (Error: %d [%s])\n", errpos, errval, errstr));
ret = EFAULT;
goto done;
}
*out = ctx;
ret = EOK;
done:
if (ret != EOK) {
talloc_free(ctx);
}
return ret;
}
int sss_names_init(TALLOC_CTX *mem_ctx, struct confdb_ctx *cdb,
const char *domain, struct sss_names_ctx **out)
{
TALLOC_CTX *tmpctx = NULL;
char *conf_path;
char *re_pattern;
char *fq_fmt;
int ret;
tmpctx = talloc_new(NULL);
if (tmpctx == NULL) {
ret = ENOMEM;
goto done;
}
conf_path = talloc_asprintf(tmpctx, CONFDB_DOMAIN_PATH_TMPL, domain);
if (conf_path == NULL) {
ret = ENOMEM;
goto done;
}
ret = confdb_get_string(cdb, tmpctx, conf_path,
CONFDB_NAME_REGEX, NULL, &re_pattern);
if (ret != EOK) goto done;
/* If not found in the domain, look in globals */
if (re_pattern == NULL) {
ret = confdb_get_string(cdb, tmpctx, CONFDB_MONITOR_CONF_ENTRY,
CONFDB_NAME_REGEX, NULL, &re_pattern);
if (ret != EOK) goto done;
}
if (re_pattern == NULL) {
ret = get_id_provider_default_re(tmpctx, cdb, conf_path, &re_pattern);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("Failed to get provider default regular " \
"expression for domain [%s].\n", domain));
goto done;
}
}
if (!re_pattern) {
re_pattern = talloc_strdup(tmpctx,
"(?P<name>[^@]+)@?(?P<domain>[^@]*$)");
if (!re_pattern) {
ret = ENOMEM;
goto done;
}
#ifdef HAVE_LIBPCRE_LESSER_THAN_7
} else {
DEBUG(2, ("This binary was build with a version of libpcre that does "
"not support non-unique named subpatterns.\n"));
DEBUG(2, ("Please make sure that your pattern [%s] only contains "
"subpatterns with a unique name and uses "
"the Python syntax (?P<name>).\n", re_pattern));
#endif
}
ret = confdb_get_string(cdb, tmpctx, conf_path,
CONFDB_FULL_NAME_FORMAT, NULL, &fq_fmt);
if (ret != EOK) goto done;
/* If not found in the domain, look in globals */
if (fq_fmt == NULL) {
ret = confdb_get_string(cdb, tmpctx, CONFDB_MONITOR_CONF_ENTRY,
CONFDB_FULL_NAME_FORMAT, NULL, &fq_fmt);
if (ret != EOK) goto done;
}
if (!fq_fmt) {
fq_fmt = talloc_strdup(tmpctx, CONFDB_DEFAULT_FULL_NAME_FORMAT);
if (!fq_fmt) {
ret = ENOMEM;
goto done;
}
}
ret = sss_names_init_from_args(mem_ctx, re_pattern, fq_fmt, out);
done:
talloc_free(tmpctx);
return ret;
}
int sss_parse_name(TALLOC_CTX *memctx,
struct sss_names_ctx *snctx,
const char *orig, char **domain, char **name)
{
pcre *re = snctx->re;
const char *result;
int ovec[30];
int origlen;
int ret, strnum;
origlen = strlen(orig);
ret = pcre_exec(re, NULL, orig, origlen, 0, PCRE_NOTEMPTY, ovec, 30);
if (ret == PCRE_ERROR_NOMATCH) {
return EINVAL;
} else if (ret < 0) {
DEBUG(SSSDBG_MINOR_FAILURE, ("PCRE Matching error, %d\n", ret));
return EINVAL;
}
if (ret == 0) {
DEBUG(1, ("Too many matches, the pattern is invalid.\n"));
}
strnum = ret;
result = NULL;
ret = pcre_get_named_substring(re, orig, ovec, strnum, "name", &result);
if (ret < 0 || !result) {
DEBUG(2, ("Name not found!\n"));
return EINVAL;
}
*name = talloc_strdup(memctx, result);
pcre_free_substring(result);
if (!*name) return ENOMEM;
result = NULL;
ret = pcre_get_named_substring(re, orig, ovec, strnum, "domain", &result);
if (ret < 0 || !result) {
DEBUG(4, ("Domain not provided!\n"));
*domain = NULL;
} else {
/* ignore "" string */
if (*result) {
*domain = talloc_strdup(memctx, result);
pcre_free_substring(result);
if (!*domain) return ENOMEM;
} else {
pcre_free_substring(result);
*domain = NULL;
}
}
return EOK;
}
static struct sss_domain_info * match_any_domain_or_subdomain_name(
struct sss_domain_info *dom,
const char *dmatch)
{
if (strcasecmp(dom->name, dmatch) == 0 ||
(dom->flat_name != NULL && strcasecmp(dom->flat_name, dmatch) == 0)) {
return dom;
}
return find_subdomain_by_name(dom, dmatch, true);
}
int sss_parse_name_for_domains(TALLOC_CTX *memctx,
struct sss_domain_info *domains,
const char *default_domain,
const char *orig, char **domain, char **name)
{
struct sss_domain_info *dom, *match = NULL;
char *rdomain, *rname;
char *dmatch, *nmatch;
char *candidate_name = NULL;
char *candidate_domain = NULL;
bool name_mismatch = false;
TALLOC_CTX *tmp_ctx;
int ret;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL)
return ENOMEM;
rname = NULL;
rdomain = NULL;
for (dom = domains; dom != NULL; dom = get_next_domain(dom, false)) {
ret = sss_parse_name(tmp_ctx, dom->names, orig, &dmatch, &nmatch);
if (ret == EOK) {
/*
* If the name matched without the domain part, make note of it.
* All the other domain expressions must agree on the domain-less
* name.
*/
if (dmatch == NULL) {
if (candidate_name == NULL) {
candidate_name = nmatch;
} else if (strcasecmp(candidate_name, nmatch) != 0) {
name_mismatch = true;
}
/*
* If a domain was returned, then it must match the name of the
* domain that this expression was found on, or one of the
* subdomains.
*/
} else {
match = match_any_domain_or_subdomain_name (dom, dmatch);
if (match != NULL) {
DEBUG(SSSDBG_FUNC_DATA, ("name '%s' matched expression for "
"domain '%s', user is %s\n",
orig, match->name, nmatch));
rdomain = talloc_strdup(tmp_ctx, match->name);
if (rdomain == NULL) {
DEBUG(SSSDBG_OP_FAILURE, ("talloc_strdup failed.\n"));
ret = ENOMEM;
goto done;
}
rname = nmatch;
break;
} else if (candidate_name == NULL) {
candidate_domain = dmatch;
}
}
/* EINVAL is returned when name doesn't match */
} else if (ret != EINVAL) {
goto done;
}
}
if (rdomain == NULL && rname == NULL) {
if (candidate_name && !name_mismatch) {
DEBUG(SSSDBG_FUNC_DATA, ("name '%s' matched without domain, " \
"user is %s\n", orig, nmatch));
rdomain = NULL;
if (default_domain != NULL) {
rdomain = talloc_strdup(tmp_ctx, default_domain);
if (rdomain == NULL) {
DEBUG(SSSDBG_OP_FAILURE, ("talloc_strdup failed.\n"));
ret = ENOMEM;
goto done;
}
for (dom = domains; dom != NULL; dom = get_next_domain(dom, false)) {
match = match_any_domain_or_subdomain_name(dom, rdomain);
if (match != NULL) {
break;
}
}
if (match == NULL) {
DEBUG(SSSDBG_FUNC_DATA, ("default domain [%s] is currently " \
"not know, trying to look it up.\n",
rdomain));
*domain = talloc_steal(memctx, rdomain);
ret = EAGAIN;
goto done;
}
}
DEBUG(SSSDBG_FUNC_DATA, ("using default domain [%s]\n", rdomain));
rname = candidate_name;
} else if (candidate_domain) {
*domain = talloc_steal(memctx, candidate_domain);
ret = EAGAIN;
goto done;
}
}
if (rdomain == NULL && rname == NULL) {
DEBUG(SSSDBG_TRACE_FUNC,
("name '%s' did not match any domain's expression\n", orig));
ret = EINVAL;
goto done;
}
if (domain != NULL) {
*domain = talloc_steal(memctx, rdomain);
}
if (name != NULL) {
*name = talloc_steal(memctx, rname);
}
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
char *
sss_get_cased_name(TALLOC_CTX *mem_ctx,
const char *orig_name,
bool case_sensitive)
{
return case_sensitive ? talloc_strdup(mem_ctx, orig_name) :
sss_tc_utf8_str_tolower(mem_ctx, orig_name);
}
errno_t
sss_get_cased_name_list(TALLOC_CTX *mem_ctx, const char * const *orig,
bool case_sensitive, const char ***_cased)
{
const char **out;
size_t num, i;
if (orig == NULL) {
*_cased = NULL;
return EOK;
}
for (num=0; orig[num]; num++); /* count the num of strings */
if (num == 0) {
*_cased = NULL;
return EOK;
}
out = talloc_array(mem_ctx, const char *, num + 1);
if (out == NULL) {
return ENOMEM;
}
for (i = 0; i < num; i++) {
out[i] = sss_get_cased_name(out, orig[i], case_sensitive);
if (out[i] == NULL) {
talloc_free(out);
return ENOMEM;
}
}
out[num] = NULL;
*_cased = out;
return EOK;
}
static inline const char *
safe_fq_str(struct sss_names_ctx *nctx, uint8_t part, const char *str)
{
return nctx->fq_flags & part ? str : "";
}
static inline const char *
safe_flat_name(struct sss_names_ctx *nctx, struct sss_domain_info *domain)
{
const char *s;
s = safe_fq_str(nctx, FQ_FMT_FLAT_NAME, domain->flat_name);
if (s == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Flat name requested but domain has no"
"flat name set, falling back to domain name\n"));
s = domain->name;
}
return s;
}
static inline size_t
fq_part_len(struct sss_names_ctx *nctx, struct sss_domain_info *dom,
uint8_t part, const char *str)
{
const char *s = str;
if (part == FQ_FMT_FLAT_NAME) {
s = safe_flat_name(nctx, dom);
}
return nctx->fq_flags & part ? strlen(s) : 0;
}
char *
sss_tc_fqname(TALLOC_CTX *mem_ctx, struct sss_names_ctx *nctx,
struct sss_domain_info *domain, const char *name)
{
if (domain == NULL || nctx == NULL) return NULL;
return talloc_asprintf(mem_ctx, nctx->fq_fmt,
safe_fq_str(nctx, FQ_FMT_NAME, name),
safe_fq_str(nctx, FQ_FMT_DOMAIN, domain->name),
safe_flat_name(nctx, domain));
}
int
sss_fqname(char *str, size_t size, struct sss_names_ctx *nctx,
struct sss_domain_info *domain, const char *name)
{
if (domain == NULL || nctx == NULL) return -EINVAL;
return snprintf(str, size, nctx->fq_fmt,
safe_fq_str(nctx, FQ_FMT_NAME, name),
safe_fq_str(nctx, FQ_FMT_DOMAIN, domain->name),
safe_flat_name(nctx, domain));
}
size_t
sss_fqdom_len(struct sss_names_ctx *nctx,
struct sss_domain_info *domain)
{
size_t len = fq_part_len(nctx, domain, FQ_FMT_DOMAIN, domain->name);
len += fq_part_len(nctx, domain, FQ_FMT_FLAT_NAME, domain->flat_name);
return len;
}
char *
sss_get_domain_name(TALLOC_CTX *mem_ctx,
const char *orig_name,
struct sss_domain_info *dom)
{
char *user_name;
if (IS_SUBDOMAIN(dom) && dom->fqnames) {
/* we always use the fully qualified name for subdomain users */
user_name = sss_tc_fqname(mem_ctx, dom->names, dom, orig_name);
} else {
user_name = talloc_strdup(mem_ctx, orig_name);
}
return user_name;
}
|