From e5a984093ad7921c83da75272cede2b0e52ba2d6 Mon Sep 17 00:00:00 2001 From: Jakub Hrozek Date: Nov 03 2016 10:02:22 +0000 Subject: SYSDB: Split sysdb_try_to_find_expected_dn() into smaller functions The function sysdb_try_to_find_expected_dn was performing several matching algorithms and thus it was getting big and hard to extend. This patch doesn't contain any functional changes, only shuffles the code around and splits the monolithic sysdb_try_to_find_expected_dn function into smaller blocks. Reviewed-by: Sumit Bose --- diff --git a/src/db/sysdb_subdomains.c b/src/db/sysdb_subdomains.c index ff83f91..b011bad 100644 --- a/src/db/sysdb_subdomains.c +++ b/src/db/sysdb_subdomains.c @@ -1145,74 +1145,29 @@ done: return ret; } -errno_t sysdb_try_to_find_expected_dn(struct sss_domain_info *dom, - const char *domain_component_name, - struct sysdb_attrs **usr_attrs, - size_t count, - struct sysdb_attrs **exp_usr) +static errno_t match_cn_users(TALLOC_CTX *tmp_ctx, + struct sysdb_attrs **usr_attrs, + size_t count, + const char *dom_basedn, + struct sysdb_attrs **_result) { - char *dom_basedn; - size_t dom_basedn_len; - char *expected_basedn; - size_t expected_basedn_len; - size_t dn_len; + errno_t ret; const char *orig_dn; - size_t c = 0; - int ret; - TALLOC_CTX *tmp_ctx; - struct ldb_context *ldb_ctx; - struct ldb_dn *ldb_dom_basedn; - int dom_basedn_comp_num; - struct ldb_dn *ldb_dn; - int dn_comp_num; - const char *component_name; + size_t dn_len; struct sysdb_attrs *result = NULL; const char *result_dn_str = NULL; + char *cn_users_basedn; + size_t cn_users_basedn_len; - if (dom == NULL || domain_component_name == NULL || usr_attrs == NULL - || count == 0) { - return EINVAL; - } - - tmp_ctx = talloc_new(NULL); - if (tmp_ctx == NULL) { - DEBUG(SSSDBG_OP_FAILURE, "talloc_new failed.\n"); - return ENOMEM; - } - - ret = domain_to_basedn(tmp_ctx, dom->name, &dom_basedn); - if (ret != EOK) { - DEBUG(SSSDBG_OP_FAILURE, "domain_to_basedn failed.\n"); - goto done; - } - expected_basedn = talloc_asprintf(tmp_ctx, "%s%s", "cn=users,", dom_basedn); - if (expected_basedn == NULL) { - ret = ENOMEM; - goto done; - } - - ldb_ctx = sysdb_ctx_get_ldb(dom->sysdb); - if (ldb_ctx == NULL) { - DEBUG(SSSDBG_OP_FAILURE, "Missing ldb context.\n"); - ret = EINVAL; - goto done; - } - - ldb_dom_basedn = ldb_dn_new(tmp_ctx, ldb_ctx, dom_basedn); - if (ldb_dom_basedn == NULL) { - DEBUG(SSSDBG_OP_FAILURE, "ldb_dn_new failed.\n"); + cn_users_basedn = talloc_asprintf(tmp_ctx, "%s%s", "cn=users,", dom_basedn); + if (cn_users_basedn == NULL) { ret = ENOMEM; goto done; } + cn_users_basedn_len = strlen(cn_users_basedn); + DEBUG(SSSDBG_TRACE_ALL, "cn=users baseDN is [%s].\n", cn_users_basedn); - dom_basedn_comp_num = ldb_dn_get_comp_num(ldb_dom_basedn); - dom_basedn_comp_num++; - - DEBUG(SSSDBG_TRACE_ALL, "Expected BaseDN is [%s].\n", expected_basedn); - expected_basedn_len = strlen(expected_basedn); - dom_basedn_len = strlen(dom_basedn); - - for (c = 0; c < count; c++) { + for (size_t c = 0; c < count; c++) { ret = sysdb_attrs_get_string(usr_attrs[c], SYSDB_ORIG_DN, &orig_dn); if (ret != EOK) { DEBUG(SSSDBG_OP_FAILURE, "sysdb_attrs_get_string failed.\n"); @@ -1220,9 +1175,9 @@ errno_t sysdb_try_to_find_expected_dn(struct sss_domain_info *dom, } dn_len = strlen(orig_dn); - if (dn_len > expected_basedn_len - && strcasecmp(orig_dn + (dn_len - expected_basedn_len), - expected_basedn) == 0) { + if (dn_len > cn_users_basedn_len + && strcasecmp(orig_dn + (dn_len - cn_users_basedn_len), + cn_users_basedn) == 0) { DEBUG(SSSDBG_TRACE_ALL, "Found matching dn [%s].\n", orig_dn); if (result != NULL) { @@ -1237,52 +1192,177 @@ errno_t sysdb_try_to_find_expected_dn(struct sss_domain_info *dom, } } - if (result == NULL) { - for (c = 0; c < count; c++) { - ret = sysdb_attrs_get_string(usr_attrs[c], SYSDB_ORIG_DN, &orig_dn); - if (ret != EOK) { - DEBUG(SSSDBG_OP_FAILURE, "sysdb_attrs_get_string failed.\n"); + ret = EOK; +done: + *_result = result; + return ret; +} + +static errno_t match_non_dc_comp(TALLOC_CTX *tmp_ctx, + struct sss_domain_info *dom, + struct sysdb_attrs **usr_attrs, + size_t count, + struct ldb_dn *ldb_basedn, + const char *basedn, + const char *domain_component_name, + struct sysdb_attrs **_result) +{ + errno_t ret; + const char *orig_dn; + size_t orig_dn_len; + size_t basedn_len; + struct ldb_context *ldb_ctx; + struct ldb_dn *ldb_orig_dn; + int dn_comp_num; + int basedn_comp_num; + const char *component_name; + struct sysdb_attrs *result = NULL; + const char *result_dn_str = NULL; + + ldb_ctx = sysdb_ctx_get_ldb(dom->sysdb); + if (ldb_ctx == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "Missing ldb context.\n"); + ret = EINVAL; + goto done; + } + + basedn_len = strlen(basedn); + + basedn_comp_num = ldb_dn_get_comp_num(ldb_basedn); + basedn_comp_num++; + + for (size_t c = 0; c < count; c++) { + ret = sysdb_attrs_get_string(usr_attrs[c], SYSDB_ORIG_DN, &orig_dn); + if (ret != EOK) { + DEBUG(SSSDBG_OP_FAILURE, "sysdb_attrs_get_string failed.\n"); + goto done; + } + orig_dn_len = strlen(orig_dn); + + if (orig_dn_len > basedn_len + /* Does the user's original DN with the non-domain part + * stripped match the domain base DN? + */ + && strcasecmp(orig_dn + (orig_dn_len - basedn_len), + basedn) == 0) { + ldb_orig_dn = ldb_dn_new(tmp_ctx, ldb_ctx, orig_dn); + if (ldb_orig_dn == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "ldb_dn_new failed"); + ret = ENOMEM; goto done; } - dn_len = strlen(orig_dn); - - if (dn_len > dom_basedn_len - && strcasecmp(orig_dn + (dn_len - dom_basedn_len), - dom_basedn) == 0) { - ldb_dn = ldb_dn_new(tmp_ctx, ldb_ctx, orig_dn); - if (ldb_dn == NULL) { - DEBUG(SSSDBG_OP_FAILURE, "ldb_dn_new failed"); - ret = ENOMEM; - goto done; - } - dn_comp_num = ldb_dn_get_comp_num(ldb_dn); - if (dn_comp_num > dom_basedn_comp_num) { - component_name = ldb_dn_get_component_name(ldb_dn, - (dn_comp_num - dom_basedn_comp_num)); - DEBUG(SSSDBG_TRACE_ALL, "Comparing [%s] and [%s].\n", - component_name, - domain_component_name); - if (component_name != NULL - && strcasecmp(component_name, - domain_component_name) != 0) { - DEBUG(SSSDBG_TRACE_ALL, - "Found matching dn [%s].\n", orig_dn); - if (result != NULL) { - DEBUG(SSSDBG_OP_FAILURE, - "Found 2 matching DN [%s] and [%s], " - "expecting only 1.\n", result_dn_str, orig_dn); - ret = EINVAL; - goto done; - } - result = usr_attrs[c]; - result_dn_str = orig_dn; + dn_comp_num = ldb_dn_get_comp_num(ldb_orig_dn); + if (dn_comp_num > basedn_comp_num) { + component_name = ldb_dn_get_component_name(ldb_orig_dn, + (dn_comp_num - basedn_comp_num)); + DEBUG(SSSDBG_TRACE_ALL, "Comparing [%s] and [%s].\n", + component_name, + domain_component_name); + /* If the component is NOT a DC component, then the entry + * must come from our domain, perhaps from a child container. + * If it matched the DC component, the entry was from a child + * subdomain different from this one. + */ + if (component_name != NULL + && strcasecmp(component_name, + domain_component_name) != 0) { + DEBUG(SSSDBG_TRACE_ALL, + "Found matching dn [%s].\n", orig_dn); + if (result != NULL) { + DEBUG(SSSDBG_OP_FAILURE, + "Found 2 matching DN [%s] and [%s], " + "expecting only 1.\n", result_dn_str, orig_dn); + ret = EINVAL; + goto done; } + result = usr_attrs[c]; + result_dn_str = orig_dn; } } } } + ret = EOK; + *_result = result; +done: + return ret; +} + +static errno_t match_basedn(TALLOC_CTX *tmp_ctx, + struct sss_domain_info *dom, + struct sysdb_attrs **usr_attrs, + size_t count, + const char *dom_basedn, + const char *domain_component_name, + struct sysdb_attrs **_result) +{ + struct ldb_context *ldb_ctx; + struct ldb_dn *ldb_dom_basedn; + + ldb_ctx = sysdb_ctx_get_ldb(dom->sysdb); + if (ldb_ctx == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "Missing ldb context.\n"); + return EINVAL; + } + + + ldb_dom_basedn = ldb_dn_new(tmp_ctx, ldb_ctx, dom_basedn); + if (ldb_dom_basedn == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "ldb_dn_new failed.\n"); + return ENOMEM; + } + + return match_non_dc_comp(tmp_ctx, dom, + usr_attrs, count, + ldb_dom_basedn, dom_basedn, + domain_component_name, + _result); +} + +errno_t sysdb_try_to_find_expected_dn(struct sss_domain_info *dom, + const char *domain_component_name, + struct sysdb_attrs **usr_attrs, + size_t count, + struct sysdb_attrs **exp_usr) +{ + char *dom_basedn; + int ret; + TALLOC_CTX *tmp_ctx; + struct sysdb_attrs *result = NULL; + + if (dom == NULL || domain_component_name == NULL + || usr_attrs == NULL || count == 0) { + return EINVAL; + } + + tmp_ctx = talloc_new(NULL); + if (tmp_ctx == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "talloc_new failed.\n"); + return ENOMEM; + } + + ret = domain_to_basedn(tmp_ctx, dom->name, &dom_basedn); + if (ret != EOK) { + DEBUG(SSSDBG_OP_FAILURE, "domain_to_basedn failed.\n"); + ret = EINVAL; + goto done; + } + + ret = match_cn_users(tmp_ctx, usr_attrs, count, dom_basedn, &result); + if (ret != EOK) { + goto done; + } + + if (result == NULL) { + ret = match_basedn(tmp_ctx, dom, usr_attrs, + count, dom_basedn, domain_component_name, + &result); + if (ret != EOK) { + goto done; + } + } + if (result == NULL) { DEBUG(SSSDBG_OP_FAILURE, "No matching DN found.\n"); ret = ENOENT;