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Make all SSSD processes a member of sssd supplementary group.
Previously it was done only for 'sssd_nss' to allow it to write to sssd:sssd owned mem-cache file while running under 'root'. Let's use this approach for all other files to avoid using CAP_DAC_OVERRIDE in run time (in following patches). Primarily rely on systemd to set group, but try to set it manually if (required and) missing at runtime.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| /* | ||
| SSSD | ||
| Service monitor bootstrap | ||
| 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/>. | ||
| */ | ||
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| #include "config.h" | ||
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| #include <unistd.h> | ||
| #include <errno.h> | ||
| #include <string.h> | ||
| #include <grp.h> | ||
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| #include "util/util.h" | ||
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| /* Attention! | ||
| * When those routines are being executed, internal logger isn't yet initialized. | ||
| */ | ||
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| #ifdef SSSD_NON_ROOT_USER | ||
| /* returns: -1 on error, 0 - group not set, 1 - group set */ | ||
| static int check_supplementary_group(gid_t gid) | ||
| { | ||
| int size; | ||
| gid_t *supp_gids = NULL; | ||
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| if (getegid() == gid) { | ||
| return 1; | ||
| } | ||
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| size = getgroups(0, NULL); | ||
| if (size == -1) { | ||
| return -1; | ||
| } | ||
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| if (size > 0) { | ||
| supp_gids = talloc_zero_array(NULL, gid_t, size); | ||
| if (supp_gids == NULL) { | ||
| return -1; | ||
| } | ||
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| size = getgroups(size, supp_gids); | ||
| if (size == -1) { | ||
| talloc_free(supp_gids); | ||
| return -1; | ||
| } | ||
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| for (int i = 0; i < size; i++) { | ||
| if (supp_gids[i] == gid) { | ||
| talloc_free(supp_gids); | ||
| return 1; | ||
| } | ||
| } | ||
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| talloc_free(supp_gids); | ||
| } | ||
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| return 0; | ||
| } | ||
| #endif /* SSSD_NON_ROOT_USER */ | ||
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| int bootstrap_monitor_process(void) | ||
| { | ||
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| #ifdef SSSD_NON_ROOT_USER | ||
| /* In case SSSD is built with non-root user support, | ||
| * a number of files are sssd:sssd owned. | ||
| * Make sure all processes are added to sssd supplementary | ||
| * group to avoid the need for CAP_DAC_OVERRIDE. | ||
| * | ||
| * TODO: read 'sssd.conf::user' first and in case it is set | ||
| * to 'sssd' become_user(sssd) instead. | ||
| */ | ||
| int ret; | ||
| gid_t sssd_gid = 0; | ||
| if ((getuid() == 0) || (geteuid() == 0)) { | ||
| sss_sssd_user_uid_and_gid(NULL, &sssd_gid); | ||
| ret = check_supplementary_group(sssd_gid); | ||
| if (ret == -1) { | ||
| sss_log(SSS_LOG_ALERT, "Can't check own supplementary groups."); | ||
| return 1; | ||
| } | ||
| /* Expected outcome is 'ret == 1' since supplementary group should be set | ||
| by systemd service description. */ | ||
| if (ret == 0) { | ||
| /* Probably non-systemd based system or service file was edited, | ||
| let's try to set group manually. */ | ||
| sss_log(SSS_LOG_WARNING, | ||
| "SSSD is built with support of 'run under non-root user' " | ||
| "feature but started under 'root'. Trying to add process " | ||
| "to SSSD supplementary group."); | ||
| ret = setgroups(1, &sssd_gid); | ||
| if (ret != 0) { | ||
| sss_log(SSS_LOG_CRIT, | ||
| "Failed to add process to the "SSSD_USER" supplementary group. " | ||
| "Either run under '"SSSD_USER"' or make sure that run-under-root " | ||
| "main SSSD process has CAP_SETGID."); | ||
| return 1; | ||
| } | ||
| } | ||
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| /* TODO: drop CAP_SET_GID capability */ | ||
| } | ||
| #endif /* SSSD_NON_ROOT_USER */ | ||
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| return 0; | ||
| } |
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