diff options
Diffstat (limited to 'gnu/system/pam.scm')
| -rw-r--r-- | gnu/system/pam.scm | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/gnu/system/pam.scm b/gnu/system/pam.scm index 743039daf6..cd7a3427ed 100644 --- a/gnu/system/pam.scm +++ b/gnu/system/pam.scm @@ -23,6 +23,7 @@ #:use-module (gnu services) #:use-module (ice-9 match) #:use-module (srfi srfi-1) + #:use-module (srfi srfi-9) #:use-module (srfi srfi-11) #:use-module (srfi srfi-26) #:use-module ((guix utils) #:select (%current-system)) @@ -38,6 +39,13 @@ pam-entry-module pam-entry-arguments + pam-limits-entry + pam-limits-entry-domain + pam-limits-entry-type + pam-limits-entry-item + pam-limits-entry-value + pam-limits-entry->string + pam-services->directory unix-pam-service base-pam-services @@ -76,6 +84,59 @@ (arguments pam-entry-arguments ; list of string-valued g-expressions (default '()))) +;; PAM limits entries are used by the pam_limits PAM module to set or override +;; limits on system resources for user sessions. The format is specified +;; here: http://linux-pam.org/Linux-PAM-html/sag-pam_limits.html +(define-record-type <pam-limits-entry> + (make-pam-limits-entry domain type item value) + pam-limits-entry? + (domain pam-limits-entry-domain) ; string + (type pam-limits-entry-type) ; symbol + (item pam-limits-entry-item) ; symbol + (value pam-limits-entry-value)) ; symbol or number + +(define (pam-limits-entry domain type item value) + "Construct a pam-limits-entry ensuring that the provided values are valid." + (define (valid? value) + (case item + ((priority) (number? value)) + ((nice) (and (number? value) + (>= value -20) + (<= value 19))) + (else (or (and (number? value) + (>= value -1)) + (member value '(unlimited infinity)))))) + (define items + (list 'core 'data 'fsize + 'memlock 'nofile 'rss + 'stack 'cpu 'nproc + 'as 'maxlogins 'maxsyslogins + 'priority 'locks 'sigpending + 'msgqueue 'nice 'rtprio)) + (when (not (member type '(hard soft both))) + (error "invalid limit type" type)) + (when (not (member item items)) + (error "invalid limit item" item)) + (when (not (valid? value)) + (error "invalid limit value" value)) + (make-pam-limits-entry domain type item value)) + +(define (pam-limits-entry->string entry) + "Convert a pam-limits-entry record to a string." + (match entry + (($ <pam-limits-entry> domain type item value) + (string-join (list domain + (if (eq? type 'both) + "-" + (symbol->string type)) + (symbol->string item) + (cond + ((symbol? value) + (symbol->string value)) + (else + (number->string value)))) + " ")))) + (define (pam-service->configuration service) "Return the derivation building the configuration file for SERVICE, to be dumped in /etc/pam.d/NAME, where NAME is the name of SERVICE." |